JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2019, Red Hat Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "asm/macroAssembler.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "gc/shared/barrierSet.hpp"
#include "gc/shared/barrierSetAssembler.hpp"
#include "interpreter/interpreter.hpp"
#include "memory/universe.hpp"
#include "nativeInst_aarch64.hpp"
#include "oops/instanceOop.hpp"
#include "oops/method.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/oop.inline.hpp"
#include "prims/methodHandles.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubCodeGenerator.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/thread.inline.hpp"
#include "utilities/align.hpp"
#ifdef COMPILER2
#include "opto/runtime.hpp"
#endif
#if INCLUDE_ZGC
#include "gc/z/zThreadLocalData.hpp"
#endif
// Declaration and definition of StubGenerator (no .hpp file).
// For a more detailed description of the stub routine structure
// see the comment in stubRoutines.hpp
#undef __
#define __ _masm->
#define TIMES_OOP Address::sxtw(exact_log2(UseCompressedOops ? 4 : 8))
#ifdef PRODUCT
#define BLOCK_COMMENT(str) /* nothing */
#else
#define BLOCK_COMMENT(str) __ block_comment(str)
#endif
#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
// Stub Code definitions
class StubGenerator: public StubCodeGenerator {
private:
#ifdef PRODUCT
#define inc_counter_np(counter) ((void)0)
#else
void inc_counter_np_(int& counter) {
__ lea(rscratch2, ExternalAddress((address)&counter));
__ ldrw(rscratch1, Address(rscratch2));
__ addw(rscratch1, rscratch1, 1);
__ strw(rscratch1, Address(rscratch2));
}
#define inc_counter_np(counter) \
BLOCK_COMMENT("inc_counter " #counter); \
inc_counter_np_(counter);
#endif
// Call stubs are used to call Java from C
//
// Arguments:
// c_rarg0: call wrapper address address
// c_rarg1: result address
// c_rarg2: result type BasicType
// c_rarg3: method Method*
// c_rarg4: (interpreter) entry point address
// c_rarg5: parameters intptr_t*
// c_rarg6: parameter size (in words) int
// c_rarg7: thread Thread*
//
// There is no return from the stub itself as any Java result
// is written to result
//
// we save r30 (lr) as the return PC at the base of the frame and
// link r29 (fp) below it as the frame pointer installing sp (r31)
// into fp.
//
// we save r0-r7, which accounts for all the c arguments.
//
// TODO: strictly do we need to save them all? they are treated as
// volatile by C so could we omit saving the ones we are going to
// place in global registers (thread? method?) or those we only use
// during setup of the Java call?
//
// we don't need to save r8 which C uses as an indirect result location
// return register.
//
// we don't need to save r9-r15 which both C and Java treat as
// volatile
//
// we don't need to save r16-18 because Java does not use them
//
// we save r19-r28 which Java uses as scratch registers and C
// expects to be callee-save
//
// we save the bottom 64 bits of each value stored in v8-v15; it is
// the responsibility of the caller to preserve larger values.
//
// so the stub frame looks like this when we enter Java code
//
// [ return_from_Java ] <--- sp
// [ argument word n ]
// ...
// -27 [ argument word 1 ]
// -26 [ saved v15 ] <--- sp_after_call
// -25 [ saved v14 ]
// -24 [ saved v13 ]
// -23 [ saved v12 ]
// -22 [ saved v11 ]
// -21 [ saved v10 ]
// -20 [ saved v9 ]
// -19 [ saved v8 ]
// -18 [ saved r28 ]
// -17 [ saved r27 ]
// -16 [ saved r26 ]
// -15 [ saved r25 ]
// -14 [ saved r24 ]
// -13 [ saved r23 ]
// -12 [ saved r22 ]
// -11 [ saved r21 ]
// -10 [ saved r20 ]
// -9 [ saved r19 ]
// -8 [ call wrapper (r0) ]
// -7 [ result (r1) ]
// -6 [ result type (r2) ]
// -5 [ method (r3) ]
// -4 [ entry point (r4) ]
// -3 [ parameters (r5) ]
// -2 [ parameter size (r6) ]
// -1 [ thread (r7) ]
// 0 [ saved fp (r29) ] <--- fp == saved sp (r31)
// 1 [ saved lr (r30) ]
// Call stub stack layout word offsets from fp
enum call_stub_layout {
sp_after_call_off = -26,
d15_off = -26,
d13_off = -24,
d11_off = -22,
d9_off = -20,
r28_off = -18,
r26_off = -16,
r24_off = -14,
r22_off = -12,
r20_off = -10,
call_wrapper_off = -8,
result_off = -7,
result_type_off = -6,
method_off = -5,
entry_point_off = -4,
parameter_size_off = -2,
thread_off = -1,
fp_f = 0,
retaddr_off = 1,
};
address generate_call_stub(address& return_address) {
assert((int)frame::entry_frame_after_call_words == -(int)sp_after_call_off + 1 &&
(int)frame::entry_frame_call_wrapper_offset == (int)call_wrapper_off,
"adjust this code");
StubCodeMark mark(this, "StubRoutines", "call_stub");
address start = __ pc();
const Address sp_after_call(rfp, sp_after_call_off * wordSize);
const Address call_wrapper (rfp, call_wrapper_off * wordSize);
const Address result (rfp, result_off * wordSize);
const Address result_type (rfp, result_type_off * wordSize);
const Address method (rfp, method_off * wordSize);
const Address entry_point (rfp, entry_point_off * wordSize);
const Address parameter_size(rfp, parameter_size_off * wordSize);
const Address thread (rfp, thread_off * wordSize);
const Address d15_save (rfp, d15_off * wordSize);
const Address d13_save (rfp, d13_off * wordSize);
const Address d11_save (rfp, d11_off * wordSize);
const Address d9_save (rfp, d9_off * wordSize);
const Address r28_save (rfp, r28_off * wordSize);
const Address r26_save (rfp, r26_off * wordSize);
const Address r24_save (rfp, r24_off * wordSize);
const Address r22_save (rfp, r22_off * wordSize);
const Address r20_save (rfp, r20_off * wordSize);
// stub code
address aarch64_entry = __ pc();
// set up frame and move sp to end of save area
__ enter();
__ sub(sp, rfp, -sp_after_call_off * wordSize);
// save register parameters and Java scratch/global registers
// n.b. we save thread even though it gets installed in
// rthread because we want to sanity check rthread later
__ str(c_rarg7, thread);
__ strw(c_rarg6, parameter_size);
__ stp(c_rarg4, c_rarg5, entry_point);
__ stp(c_rarg2, c_rarg3, result_type);
__ stp(c_rarg0, c_rarg1, call_wrapper);
__ stp(r20, r19, r20_save);
__ stp(r22, r21, r22_save);
__ stp(r24, r23, r24_save);
__ stp(r26, r25, r26_save);
__ stp(r28, r27, r28_save);
__ stpd(v9, v8, d9_save);
__ stpd(v11, v10, d11_save);
__ stpd(v13, v12, d13_save);
__ stpd(v15, v14, d15_save);
// install Java thread in global register now we have saved
// whatever value it held
__ mov(rthread, c_rarg7);
// And method
__ mov(rmethod, c_rarg3);
// set up the heapbase register
__ reinit_heapbase();
#ifdef ASSERT
// make sure we have no pending exceptions
{
Label L;
__ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
__ cmp(rscratch1, (u1)NULL_WORD);
__ br(Assembler::EQ, L);
__ stop("StubRoutines::call_stub: entered with pending exception");
__ BIND(L);
}
#endif
// pass parameters if any
__ mov(esp, sp);
__ sub(rscratch1, sp, c_rarg6, ext::uxtw, LogBytesPerWord); // Move SP out of the way
__ andr(sp, rscratch1, -2 * wordSize);
BLOCK_COMMENT("pass parameters if any");
Label parameters_done;
// parameter count is still in c_rarg6
// and parameter pointer identifying param 1 is in c_rarg5
__ cbzw(c_rarg6, parameters_done);
address loop = __ pc();
__ ldr(rscratch1, Address(__ post(c_rarg5, wordSize)));
__ subsw(c_rarg6, c_rarg6, 1);
__ push(rscratch1);
__ br(Assembler::GT, loop);
__ BIND(parameters_done);
// call Java entry -- passing methdoOop, and current sp
// rmethod: Method*
// r13: sender sp
BLOCK_COMMENT("call Java function");
__ mov(r13, sp);
__ blr(c_rarg4);
// we do this here because the notify will already have been done
// if we get to the next instruction via an exception
//
// n.b. adding this instruction here affects the calculation of
// whether or not a routine returns to the call stub (used when
// doing stack walks) since the normal test is to check the return
// pc against the address saved below. so we may need to allow for
// this extra instruction in the check.
// save current address for use by exception handling code
return_address = __ pc();
// store result depending on type (everything that is not
// T_OBJECT, T_LONG, T_FLOAT or T_DOUBLE is treated as T_INT)
// n.b. this assumes Java returns an integral result in r0
// and a floating result in j_farg0
__ ldr(j_rarg2, result);
Label is_long, is_float, is_double, exit;
__ ldr(j_rarg1, result_type);
__ cmp(j_rarg1, (u1)T_OBJECT);
__ br(Assembler::EQ, is_long);
__ cmp(j_rarg1, (u1)T_LONG);
__ br(Assembler::EQ, is_long);
__ cmp(j_rarg1, (u1)T_FLOAT);
__ br(Assembler::EQ, is_float);
__ cmp(j_rarg1, (u1)T_DOUBLE);
__ br(Assembler::EQ, is_double);
// handle T_INT case
__ strw(r0, Address(j_rarg2));
__ BIND(exit);
// pop parameters
__ sub(esp, rfp, -sp_after_call_off * wordSize);
#ifdef ASSERT
// verify that threads correspond
{
Label L, S;
__ ldr(rscratch1, thread);
__ cmp(rthread, rscratch1);
__ br(Assembler::NE, S);
__ get_thread(rscratch1);
__ cmp(rthread, rscratch1);
__ br(Assembler::EQ, L);
__ BIND(S);
__ stop("StubRoutines::call_stub: threads must correspond");
__ BIND(L);
}
#endif
// restore callee-save registers
__ ldpd(v15, v14, d15_save);
__ ldpd(v13, v12, d13_save);
__ ldpd(v11, v10, d11_save);
__ ldpd(v9, v8, d9_save);
__ ldp(r28, r27, r28_save);
__ ldp(r26, r25, r26_save);
__ ldp(r24, r23, r24_save);
__ ldp(r22, r21, r22_save);
__ ldp(r20, r19, r20_save);
__ ldp(c_rarg0, c_rarg1, call_wrapper);
__ ldrw(c_rarg2, result_type);
__ ldr(c_rarg3, method);
__ ldp(c_rarg4, c_rarg5, entry_point);
__ ldp(c_rarg6, c_rarg7, parameter_size);
// leave frame and return to caller
__ leave();
__ ret(lr);
// handle return types different from T_INT
__ BIND(is_long);
__ str(r0, Address(j_rarg2, 0));
__ br(Assembler::AL, exit);
__ BIND(is_float);
__ strs(j_farg0, Address(j_rarg2, 0));
__ br(Assembler::AL, exit);
__ BIND(is_double);
__ strd(j_farg0, Address(j_rarg2, 0));
__ br(Assembler::AL, exit);
return start;
}
// Return point for a Java call if there's an exception thrown in
// Java code. The exception is caught and transformed into a
// pending exception stored in JavaThread that can be tested from
// within the VM.
//
// Note: Usually the parameters are removed by the callee. In case
// of an exception crossing an activation frame boundary, that is
// not the case if the callee is compiled code => need to setup the
// rsp.
//
// r0: exception oop
address generate_catch_exception() {
StubCodeMark mark(this, "StubRoutines", "catch_exception");
address start = __ pc();
// same as in generate_call_stub():
const Address sp_after_call(rfp, sp_after_call_off * wordSize);
const Address thread (rfp, thread_off * wordSize);
#ifdef ASSERT
// verify that threads correspond
{
Label L, S;
__ ldr(rscratch1, thread);
__ cmp(rthread, rscratch1);
__ br(Assembler::NE, S);
__ get_thread(rscratch1);
__ cmp(rthread, rscratch1);
__ br(Assembler::EQ, L);
__ bind(S);
__ stop("StubRoutines::catch_exception: threads must correspond");
__ bind(L);
}
#endif
// set pending exception
__ verify_oop(r0);
__ str(r0, Address(rthread, Thread::pending_exception_offset()));
__ mov(rscratch1, (address)__FILE__);
__ str(rscratch1, Address(rthread, Thread::exception_file_offset()));
__ movw(rscratch1, (int)__LINE__);
__ strw(rscratch1, Address(rthread, Thread::exception_line_offset()));
// complete return to VM
assert(StubRoutines::_call_stub_return_address != NULL,
"_call_stub_return_address must have been generated before");
__ b(StubRoutines::_call_stub_return_address);
return start;
}
// Continuation point for runtime calls returning with a pending
// exception. The pending exception check happened in the runtime
// or native call stub. The pending exception in Thread is
// converted into a Java-level exception.
//
// Contract with Java-level exception handlers:
// r0: exception
// r3: throwing pc
//
// NOTE: At entry of this stub, exception-pc must be in LR !!
// NOTE: this is always used as a jump target within generated code
// so it just needs to be generated code wiht no x86 prolog
address generate_forward_exception() {
StubCodeMark mark(this, "StubRoutines", "forward exception");
address start = __ pc();
// Upon entry, LR points to the return address returning into
// Java (interpreted or compiled) code; i.e., the return address
// becomes the throwing pc.
//
// Arguments pushed before the runtime call are still on the stack
// but the exception handler will reset the stack pointer ->
// ignore them. A potential result in registers can be ignored as
// well.
#ifdef ASSERT
// make sure this code is only executed if there is a pending exception
{
Label L;
__ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
__ cbnz(rscratch1, L);
__ stop("StubRoutines::forward exception: no pending exception (1)");
__ bind(L);
}
#endif
// compute exception handler into r19
// call the VM to find the handler address associated with the
// caller address. pass thread in r0 and caller pc (ret address)
// in r1. n.b. the caller pc is in lr, unlike x86 where it is on
// the stack.
__ mov(c_rarg1, lr);
// lr will be trashed by the VM call so we move it to R19
// (callee-saved) because we also need to pass it to the handler
// returned by this call.
__ mov(r19, lr);
BLOCK_COMMENT("call exception_handler_for_return_address");
__ call_VM_leaf(CAST_FROM_FN_PTR(address,
SharedRuntime::exception_handler_for_return_address),
rthread, c_rarg1);
// we should not really care that lr is no longer the callee
// address. we saved the value the handler needs in r19 so we can
// just copy it to r3. however, the C2 handler will push its own
// frame and then calls into the VM and the VM code asserts that
// the PC for the frame above the handler belongs to a compiled
// Java method. So, we restore lr here to satisfy that assert.
__ mov(lr, r19);
// setup r0 & r3 & clear pending exception
__ mov(r3, r19);
__ mov(r19, r0);
__ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
__ str(zr, Address(rthread, Thread::pending_exception_offset()));
#ifdef ASSERT
// make sure exception is set
{
Label L;
__ cbnz(r0, L);
__ stop("StubRoutines::forward exception: no pending exception (2)");
__ bind(L);
}
#endif
// continue at exception handler
// r0: exception
// r3: throwing pc
// r19: exception handler
__ verify_oop(r0);
__ br(r19);
return start;
}
// Non-destructive plausibility checks for oops
//
// Arguments:
// r0: oop to verify
// rscratch1: error message
//
// Stack after saving c_rarg3:
// [tos + 0]: saved c_rarg3
// [tos + 1]: saved c_rarg2
// [tos + 2]: saved lr
// [tos + 3]: saved rscratch2
// [tos + 4]: saved r0
// [tos + 5]: saved rscratch1
address generate_verify_oop() {
StubCodeMark mark(this, "StubRoutines", "verify_oop");
address start = __ pc();
Label exit, error;
// save c_rarg2 and c_rarg3
__ stp(c_rarg3, c_rarg2, Address(__ pre(sp, -16)));
// __ incrementl(ExternalAddress((address) StubRoutines::verify_oop_count_addr()));
__ lea(c_rarg2, ExternalAddress((address) StubRoutines::verify_oop_count_addr()));
__ ldr(c_rarg3, Address(c_rarg2));
__ add(c_rarg3, c_rarg3, 1);
__ str(c_rarg3, Address(c_rarg2));
// object is in r0
// make sure object is 'reasonable'
__ cbz(r0, exit); // if obj is NULL it is OK
#if INCLUDE_ZGC
if (UseZGC) {
// Check if mask is good.
// verifies that ZAddressBadMask & r0 == 0
__ ldr(c_rarg3, Address(rthread, ZThreadLocalData::address_bad_mask_offset()));
__ andr(c_rarg2, r0, c_rarg3);
__ cbnz(c_rarg2, error);
}
#endif
// Check if the oop is in the right area of memory
__ mov(c_rarg3, (intptr_t) Universe::verify_oop_mask());
__ andr(c_rarg2, r0, c_rarg3);
__ mov(c_rarg3, (intptr_t) Universe::verify_oop_bits());
// Compare c_rarg2 and c_rarg3. We don't use a compare
// instruction here because the flags register is live.
__ eor(c_rarg2, c_rarg2, c_rarg3);
__ cbnz(c_rarg2, error);
// make sure klass is 'reasonable', which is not zero.
__ load_klass(r0, r0); // get klass
__ cbz(r0, error); // if klass is NULL it is broken
// return if everything seems ok
__ bind(exit);
__ ldp(c_rarg3, c_rarg2, Address(__ post(sp, 16)));
__ ret(lr);
// handle errors
__ bind(error);
__ ldp(c_rarg3, c_rarg2, Address(__ post(sp, 16)));
__ push(RegSet::range(r0, r29), sp);
// debug(char* msg, int64_t pc, int64_t regs[])
__ mov(c_rarg0, rscratch1); // pass address of error message
__ mov(c_rarg1, lr); // pass return address
__ mov(c_rarg2, sp); // pass address of regs on stack
#ifndef PRODUCT
assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
#endif
BLOCK_COMMENT("call MacroAssembler::debug");
__ mov(rscratch1, CAST_FROM_FN_PTR(address, MacroAssembler::debug64));
__ blr(rscratch1);
__ hlt(0);
return start;
}
void array_overlap_test(Label& L_no_overlap, Address::sxtw sf) { __ b(L_no_overlap); }
// The inner part of zero_words(). This is the bulk operation,
// zeroing words in blocks, possibly using DC ZVA to do it. The
// caller is responsible for zeroing the last few words.
//
// Inputs:
// r10: the HeapWord-aligned base address of an array to zero.
// r11: the count in HeapWords, r11 > 0.
//
// Returns r10 and r11, adjusted for the caller to clear.
// r10: the base address of the tail of words left to clear.
// r11: the number of words in the tail.
// r11 < MacroAssembler::zero_words_block_size.
address generate_zero_blocks() {
Label done;
Label base_aligned;
Register base = r10, cnt = r11;
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "zero_blocks");
address start = __ pc();
if (UseBlockZeroing) {
int zva_length = VM_Version::zva_length();
// Ensure ZVA length can be divided by 16. This is required by
// the subsequent operations.
assert (zva_length % 16 == 0, "Unexpected ZVA Length");
__ tbz(base, 3, base_aligned);
__ str(zr, Address(__ post(base, 8)));
__ sub(cnt, cnt, 1);
__ bind(base_aligned);
// Ensure count >= zva_length * 2 so that it still deserves a zva after
// alignment.
Label small;
int low_limit = MAX2(zva_length * 2, (int)BlockZeroingLowLimit);
__ subs(rscratch1, cnt, low_limit >> 3);
__ br(Assembler::LT, small);
__ zero_dcache_blocks(base, cnt);
__ bind(small);
}
{
// Number of stp instructions we'll unroll
const int unroll =
MacroAssembler::zero_words_block_size / 2;
// Clear the remaining blocks.
Label loop;
__ subs(cnt, cnt, unroll * 2);
__ br(Assembler::LT, done);
__ bind(loop);
for (int i = 0; i < unroll; i++)
__ stp(zr, zr, __ post(base, 16));
__ subs(cnt, cnt, unroll * 2);
__ br(Assembler::GE, loop);
__ bind(done);
__ add(cnt, cnt, unroll * 2);
}
__ ret(lr);
return start;
}
typedef enum {
copy_forwards = 1,
copy_backwards = -1
} copy_direction;
// Bulk copy of blocks of 8 words.
//
// count is a count of words.
//
// Precondition: count >= 8
//
// Postconditions:
//
// The least significant bit of count contains the remaining count
// of words to copy. The rest of count is trash.
//
// s and d are adjusted to point to the remaining words to copy
//
void generate_copy_longs(Label &start, Register s, Register d, Register count,
copy_direction direction) {
int unit = wordSize * direction;
int bias = (UseSIMDForMemoryOps ? 4:2) * wordSize;
int offset;
const Register t0 = r3, t1 = r4, t2 = r5, t3 = r6,
t4 = r7, t5 = r10, t6 = r11, t7 = r12;
const Register stride = r13;
assert_different_registers(rscratch1, t0, t1, t2, t3, t4, t5, t6, t7);
assert_different_registers(s, d, count, rscratch1);
Label again, drain;
const char *stub_name;
if (direction == copy_forwards)
stub_name = "forward_copy_longs";
else
stub_name = "backward_copy_longs";
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", stub_name);
__ bind(start);
Label unaligned_copy_long;
if (AvoidUnalignedAccesses) {
__ tbnz(d, 3, unaligned_copy_long);
}
if (direction == copy_forwards) {
__ sub(s, s, bias);
__ sub(d, d, bias);
}
#ifdef ASSERT
// Make sure we are never given < 8 words
{
Label L;
__ cmp(count, (u1)8);
__ br(Assembler::GE, L);
__ stop("genrate_copy_longs called with < 8 words");
__ bind(L);
}
#endif
// Fill 8 registers
if (UseSIMDForMemoryOps) {
__ ldpq(v0, v1, Address(s, 4 * unit));
__ ldpq(v2, v3, Address(__ pre(s, 8 * unit)));
} else {
__ ldp(t0, t1, Address(s, 2 * unit));
__ ldp(t2, t3, Address(s, 4 * unit));
__ ldp(t4, t5, Address(s, 6 * unit));
__ ldp(t6, t7, Address(__ pre(s, 8 * unit)));
}
__ subs(count, count, 16);
__ br(Assembler::LO, drain);
int prefetch = PrefetchCopyIntervalInBytes;
bool use_stride = false;
if (direction == copy_backwards) {
use_stride = prefetch > 256;
prefetch = -prefetch;
if (use_stride) __ mov(stride, prefetch);
}
__ bind(again);
if (PrefetchCopyIntervalInBytes > 0)
__ prfm(use_stride ? Address(s, stride) : Address(s, prefetch), PLDL1KEEP);
if (UseSIMDForMemoryOps) {
__ stpq(v0, v1, Address(d, 4 * unit));
__ ldpq(v0, v1, Address(s, 4 * unit));
__ stpq(v2, v3, Address(__ pre(d, 8 * unit)));
__ ldpq(v2, v3, Address(__ pre(s, 8 * unit)));
} else {
__ stp(t0, t1, Address(d, 2 * unit));
__ ldp(t0, t1, Address(s, 2 * unit));
__ stp(t2, t3, Address(d, 4 * unit));
__ ldp(t2, t3, Address(s, 4 * unit));
__ stp(t4, t5, Address(d, 6 * unit));
__ ldp(t4, t5, Address(s, 6 * unit));
__ stp(t6, t7, Address(__ pre(d, 8 * unit)));
__ ldp(t6, t7, Address(__ pre(s, 8 * unit)));
}
__ subs(count, count, 8);
__ br(Assembler::HS, again);
// Drain
__ bind(drain);
if (UseSIMDForMemoryOps) {
__ stpq(v0, v1, Address(d, 4 * unit));
__ stpq(v2, v3, Address(__ pre(d, 8 * unit)));
} else {
__ stp(t0, t1, Address(d, 2 * unit));
__ stp(t2, t3, Address(d, 4 * unit));
__ stp(t4, t5, Address(d, 6 * unit));
__ stp(t6, t7, Address(__ pre(d, 8 * unit)));
}
{
Label L1, L2;
__ tbz(count, exact_log2(4), L1);
if (UseSIMDForMemoryOps) {
__ ldpq(v0, v1, Address(__ pre(s, 4 * unit)));
__ stpq(v0, v1, Address(__ pre(d, 4 * unit)));
} else {
__ ldp(t0, t1, Address(s, 2 * unit));
__ ldp(t2, t3, Address(__ pre(s, 4 * unit)));
__ stp(t0, t1, Address(d, 2 * unit));
__ stp(t2, t3, Address(__ pre(d, 4 * unit)));
}
__ bind(L1);
if (direction == copy_forwards) {
__ add(s, s, bias);
__ add(d, d, bias);
}
__ tbz(count, 1, L2);
__ ldp(t0, t1, Address(__ adjust(s, 2 * unit, direction == copy_backwards)));
__ stp(t0, t1, Address(__ adjust(d, 2 * unit, direction == copy_backwards)));
__ bind(L2);
}
__ ret(lr);
if (AvoidUnalignedAccesses) {
Label drain, again;
// Register order for storing. Order is different for backward copy.
__ bind(unaligned_copy_long);
// source address is even aligned, target odd aligned
//
// when forward copying word pairs we read long pairs at offsets
// {0, 2, 4, 6} (in long words). when backwards copying we read
// long pairs at offsets {-2, -4, -6, -8}. We adjust the source
// address by -2 in the forwards case so we can compute the
// source offsets for both as {2, 4, 6, 8} * unit where unit = 1
// or -1.
//
// when forward copying we need to store 1 word, 3 pairs and
// then 1 word at offsets {0, 1, 3, 5, 7}. Rather thna use a
// zero offset We adjust the destination by -1 which means we
// have to use offsets { 1, 2, 4, 6, 8} * unit for the stores.
//
// When backwards copyng we need to store 1 word, 3 pairs and
// then 1 word at offsets {-1, -3, -5, -7, -8} i.e. we use
// offsets {1, 3, 5, 7, 8} * unit.
if (direction == copy_forwards) {
__ sub(s, s, 16);
__ sub(d, d, 8);
}
// Fill 8 registers
//
// for forwards copy s was offset by -16 from the original input
// value of s so the register contents are at these offsets
// relative to the 64 bit block addressed by that original input
// and so on for each successive 64 byte block when s is updated
//
// t0 at offset 0, t1 at offset 8
// t2 at offset 16, t3 at offset 24
// t4 at offset 32, t5 at offset 40
// t6 at offset 48, t7 at offset 56
// for backwards copy s was not offset so the register contents
// are at these offsets into the preceding 64 byte block
// relative to that original input and so on for each successive
// preceding 64 byte block when s is updated. this explains the
// slightly counter-intuitive looking pattern of register usage
// in the stp instructions for backwards copy.
//
// t0 at offset -16, t1 at offset -8
// t2 at offset -32, t3 at offset -24
// t4 at offset -48, t5 at offset -40
// t6 at offset -64, t7 at offset -56
__ ldp(t0, t1, Address(s, 2 * unit));
__ ldp(t2, t3, Address(s, 4 * unit));
__ ldp(t4, t5, Address(s, 6 * unit));
__ ldp(t6, t7, Address(__ pre(s, 8 * unit)));
__ subs(count, count, 16);
__ br(Assembler::LO, drain);
int prefetch = PrefetchCopyIntervalInBytes;
bool use_stride = false;
if (direction == copy_backwards) {
use_stride = prefetch > 256;
prefetch = -prefetch;
if (use_stride) __ mov(stride, prefetch);
}
__ bind(again);
if (PrefetchCopyIntervalInBytes > 0)
__ prfm(use_stride ? Address(s, stride) : Address(s, prefetch), PLDL1KEEP);
if (direction == copy_forwards) {
// allowing for the offset of -8 the store instructions place
// registers into the target 64 bit block at the following
// offsets
//
// t0 at offset 0
// t1 at offset 8, t2 at offset 16
// t3 at offset 24, t4 at offset 32
// t5 at offset 40, t6 at offset 48
// t7 at offset 56
__ str(t0, Address(d, 1 * unit));
__ stp(t1, t2, Address(d, 2 * unit));
__ ldp(t0, t1, Address(s, 2 * unit));
__ stp(t3, t4, Address(d, 4 * unit));
__ ldp(t2, t3, Address(s, 4 * unit));
__ stp(t5, t6, Address(d, 6 * unit));
__ ldp(t4, t5, Address(s, 6 * unit));
__ str(t7, Address(__ pre(d, 8 * unit)));
__ ldp(t6, t7, Address(__ pre(s, 8 * unit)));
} else {
// d was not offset when we started so the registers are
// written into the 64 bit block preceding d with the following
// offsets
//
// t1 at offset -8
// t3 at offset -24, t0 at offset -16
// t5 at offset -48, t2 at offset -32
// t7 at offset -56, t4 at offset -48
// t6 at offset -64
//
// note that this matches the offsets previously noted for the
// loads
__ str(t1, Address(d, 1 * unit));
__ stp(t3, t0, Address(d, 3 * unit));
__ ldp(t0, t1, Address(s, 2 * unit));
__ stp(t5, t2, Address(d, 5 * unit));
__ ldp(t2, t3, Address(s, 4 * unit));
__ stp(t7, t4, Address(d, 7 * unit));
__ ldp(t4, t5, Address(s, 6 * unit));
__ str(t6, Address(__ pre(d, 8 * unit)));
__ ldp(t6, t7, Address(__ pre(s, 8 * unit)));
}
__ subs(count, count, 8);
__ br(Assembler::HS, again);
// Drain
//
// this uses the same pattern of offsets and register arguments
// as above
__ bind(drain);
if (direction == copy_forwards) {
__ str(t0, Address(d, 1 * unit));
__ stp(t1, t2, Address(d, 2 * unit));
__ stp(t3, t4, Address(d, 4 * unit));
__ stp(t5, t6, Address(d, 6 * unit));
__ str(t7, Address(__ pre(d, 8 * unit)));
} else {
__ str(t1, Address(d, 1 * unit));
__ stp(t3, t0, Address(d, 3 * unit));
__ stp(t5, t2, Address(d, 5 * unit));
__ stp(t7, t4, Address(d, 7 * unit));
__ str(t6, Address(__ pre(d, 8 * unit)));
}
// now we need to copy any remaining part block which may
// include a 4 word block subblock and/or a 2 word subblock.
// bits 2 and 1 in the count are the tell-tale for whetehr we
// have each such subblock
{
Label L1, L2;
__ tbz(count, exact_log2(4), L1);
// this is the same as above but copying only 4 longs hence
// with ony one intervening stp between the str instructions
// but note that the offsets and registers still follow the
// same pattern
__ ldp(t0, t1, Address(s, 2 * unit));
__ ldp(t2, t3, Address(__ pre(s, 4 * unit)));
if (direction == copy_forwards) {
__ str(t0, Address(d, 1 * unit));
__ stp(t1, t2, Address(d, 2 * unit));
__ str(t3, Address(__ pre(d, 4 * unit)));
} else {
__ str(t1, Address(d, 1 * unit));
__ stp(t3, t0, Address(d, 3 * unit));
__ str(t2, Address(__ pre(d, 4 * unit)));
}
__ bind(L1);
__ tbz(count, 1, L2);
// this is the same as above but copying only 2 longs hence
// there is no intervening stp between the str instructions
// but note that the offset and register patterns are still
// the same
__ ldp(t0, t1, Address(__ pre(s, 2 * unit)));
if (direction == copy_forwards) {
__ str(t0, Address(d, 1 * unit));
__ str(t1, Address(__ pre(d, 2 * unit)));
} else {
__ str(t1, Address(d, 1 * unit));
__ str(t0, Address(__ pre(d, 2 * unit)));
}
__ bind(L2);
// for forwards copy we need to re-adjust the offsets we
// applied so that s and d are follow the last words written
if (direction == copy_forwards) {
__ add(s, s, 16);
__ add(d, d, 8);
}
}
__ ret(lr);
}
}
// Small copy: less than 16 bytes.
//
// NB: Ignores all of the bits of count which represent more than 15
// bytes, so a caller doesn't have to mask them.
void copy_memory_small(Register s, Register d, Register count, Register tmp, int step) {
bool is_backwards = step < 0;
size_t granularity = uabs(step);
int direction = is_backwards ? -1 : 1;
int unit = wordSize * direction;
Label Lword, Lint, Lshort, Lbyte;
assert(granularity
&& granularity <= sizeof (jlong), "Impossible granularity in copy_memory_small");
const Register t0 = r3, t1 = r4, t2 = r5, t3 = r6;
// ??? I don't know if this bit-test-and-branch is the right thing
// to do. It does a lot of jumping, resulting in several
// mispredicted branches. It might make more sense to do this
// with something like Duff's device with a single computed branch.
__ tbz(count, 3 - exact_log2(granularity), Lword);
__ ldr(tmp, Address(__ adjust(s, unit, is_backwards)));
__ str(tmp, Address(__ adjust(d, unit, is_backwards)));
__ bind(Lword);
if (granularity <= sizeof (jint)) {
__ tbz(count, 2 - exact_log2(granularity), Lint);
__ ldrw(tmp, Address(__ adjust(s, sizeof (jint) * direction, is_backwards)));
__ strw(tmp, Address(__ adjust(d, sizeof (jint) * direction, is_backwards)));
__ bind(Lint);
}
if (granularity <= sizeof (jshort)) {
__ tbz(count, 1 - exact_log2(granularity), Lshort);
__ ldrh(tmp, Address(__ adjust(s, sizeof (jshort) * direction, is_backwards)));
__ strh(tmp, Address(__ adjust(d, sizeof (jshort) * direction, is_backwards)));
__ bind(Lshort);
}
if (granularity <= sizeof (jbyte)) {
__ tbz(count, 0, Lbyte);
__ ldrb(tmp, Address(__ adjust(s, sizeof (jbyte) * direction, is_backwards)));
__ strb(tmp, Address(__ adjust(d, sizeof (jbyte) * direction, is_backwards)));
__ bind(Lbyte);
}
}
Label copy_f, copy_b;
// All-singing all-dancing memory copy.
//
// Copy count units of memory from s to d. The size of a unit is
// step, which can be positive or negative depending on the direction
// of copy. If is_aligned is false, we align the source address.
//
void copy_memory(bool is_aligned, Register s, Register d,
Register count, Register tmp, int step) {
copy_direction direction = step < 0 ? copy_backwards : copy_forwards;
bool is_backwards = step < 0;
int granularity = uabs(step);
const Register t0 = r3, t1 = r4;
// <= 96 bytes do inline. Direction doesn't matter because we always
// load all the data before writing anything
Label copy4, copy8, copy16, copy32, copy80, copy_big, finish;
const Register t2 = r5, t3 = r6, t4 = r7, t5 = r8;
const Register t6 = r9, t7 = r10, t8 = r11, t9 = r12;
const Register send = r17, dend = r18;
if (PrefetchCopyIntervalInBytes > 0)
__ prfm(Address(s, 0), PLDL1KEEP);
__ cmp(count, u1((UseSIMDForMemoryOps ? 96:80)/granularity));
__ br(Assembler::HI, copy_big);
__ lea(send, Address(s, count, Address::lsl(exact_log2(granularity))));
__ lea(dend, Address(d, count, Address::lsl(exact_log2(granularity))));
__ cmp(count, u1(16/granularity));
__ br(Assembler::LS, copy16);
__ cmp(count, u1(64/granularity));
__ br(Assembler::HI, copy80);
__ cmp(count, u1(32/granularity));
__ br(Assembler::LS, copy32);
// 33..64 bytes
if (UseSIMDForMemoryOps) {
__ ldpq(v0, v1, Address(s, 0));
__ ldpq(v2, v3, Address(send, -32));
__ stpq(v0, v1, Address(d, 0));
__ stpq(v2, v3, Address(dend, -32));
} else {
__ ldp(t0, t1, Address(s, 0));
__ ldp(t2, t3, Address(s, 16));
__ ldp(t4, t5, Address(send, -32));
__ ldp(t6, t7, Address(send, -16));
__ stp(t0, t1, Address(d, 0));
__ stp(t2, t3, Address(d, 16));
__ stp(t4, t5, Address(dend, -32));
__ stp(t6, t7, Address(dend, -16));
}
__ b(finish);
// 17..32 bytes
__ bind(copy32);
__ ldp(t0, t1, Address(s, 0));
__ ldp(t2, t3, Address(send, -16));
__ stp(t0, t1, Address(d, 0));
__ stp(t2, t3, Address(dend, -16));
__ b(finish);
// 65..80/96 bytes
// (96 bytes if SIMD because we do 32 byes per instruction)
__ bind(copy80);
if (UseSIMDForMemoryOps) {
__ ld4(v0, v1, v2, v3, __ T16B, Address(s, 0));
__ ldpq(v4, v5, Address(send, -32));
__ st4(v0, v1, v2, v3, __ T16B, Address(d, 0));
__ stpq(v4, v5, Address(dend, -32));
} else {
__ ldp(t0, t1, Address(s, 0));
__ ldp(t2, t3, Address(s, 16));
__ ldp(t4, t5, Address(s, 32));
__ ldp(t6, t7, Address(s, 48));
__ ldp(t8, t9, Address(send, -16));
__ stp(t0, t1, Address(d, 0));
__ stp(t2, t3, Address(d, 16));
__ stp(t4, t5, Address(d, 32));
__ stp(t6, t7, Address(d, 48));
__ stp(t8, t9, Address(dend, -16));
}
__ b(finish);
// 0..16 bytes
__ bind(copy16);
__ cmp(count, u1(8/granularity));
__ br(Assembler::LO, copy8);
// 8..16 bytes
__ ldr(t0, Address(s, 0));
__ ldr(t1, Address(send, -8));
__ str(t0, Address(d, 0));
__ str(t1, Address(dend, -8));
__ b(finish);
if (granularity < 8) {
// 4..7 bytes
__ bind(copy8);
__ tbz(count, 2 - exact_log2(granularity), copy4);
__ ldrw(t0, Address(s, 0));
__ ldrw(t1, Address(send, -4));
__ strw(t0, Address(d, 0));
__ strw(t1, Address(dend, -4));
__ b(finish);
if (granularity < 4) {
// 0..3 bytes
__ bind(copy4);
__ cbz(count, finish); // get rid of 0 case
if (granularity == 2) {
__ ldrh(t0, Address(s, 0));
__ strh(t0, Address(d, 0));
} else { // granularity == 1
// Now 1..3 bytes. Handle the 1 and 2 byte case by copying
// the first and last byte.
// Handle the 3 byte case by loading and storing base + count/2
// (count == 1 (s+0)->(d+0), count == 2,3 (s+1) -> (d+1))
// This does means in the 1 byte case we load/store the same
// byte 3 times.
__ lsr(count, count, 1);
__ ldrb(t0, Address(s, 0));
__ ldrb(t1, Address(send, -1));
__ ldrb(t2, Address(s, count));
__ strb(t0, Address(d, 0));
__ strb(t1, Address(dend, -1));
__ strb(t2, Address(d, count));
}
__ b(finish);
}
}
__ bind(copy_big);
if (is_backwards) {
__ lea(s, Address(s, count, Address::lsl(exact_log2(-step))));
__ lea(d, Address(d, count, Address::lsl(exact_log2(-step))));
}
// Now we've got the small case out of the way we can align the
// source address on a 2-word boundary.
Label aligned;
if (is_aligned) {
// We may have to adjust by 1 word to get s 2-word-aligned.
__ tbz(s, exact_log2(wordSize), aligned);
__ ldr(tmp, Address(__ adjust(s, direction * wordSize, is_backwards)));
__ str(tmp, Address(__ adjust(d, direction * wordSize, is_backwards)));
__ sub(count, count, wordSize/granularity);
} else {
if (is_backwards) {
__ andr(rscratch2, s, 2 * wordSize - 1);
} else {
__ neg(rscratch2, s);
__ andr(rscratch2, rscratch2, 2 * wordSize - 1);
}
// rscratch2 is the byte adjustment needed to align s.
__ cbz(rscratch2, aligned);
int shift = exact_log2(granularity);
if (shift) __ lsr(rscratch2, rscratch2, shift);
__ sub(count, count, rscratch2);
#if 0
// ?? This code is only correct for a disjoint copy. It may or
// may not make sense to use it in that case.
// Copy the first pair; s and d may not be aligned.
__ ldp(t0, t1, Address(s, is_backwards ? -2 * wordSize : 0));
__ stp(t0, t1, Address(d, is_backwards ? -2 * wordSize : 0));
// Align s and d, adjust count
if (is_backwards) {
__ sub(s, s, rscratch2);
__ sub(d, d, rscratch2);
} else {
__ add(s, s, rscratch2);
__ add(d, d, rscratch2);
}
#else
copy_memory_small(s, d, rscratch2, rscratch1, step);
#endif
}
__ bind(aligned);
// s is now 2-word-aligned.
// We have a count of units and some trailing bytes. Adjust the
// count and do a bulk copy of words.
__ lsr(rscratch2, count, exact_log2(wordSize/granularity));
if (direction == copy_forwards)
__ bl(copy_f);
else
__ bl(copy_b);
// And the tail.
copy_memory_small(s, d, count, tmp, step);
if (granularity >= 8) __ bind(copy8);
if (granularity >= 4) __ bind(copy4);
__ bind(finish);
}
void clobber_registers() {
#ifdef ASSERT
__ mov(rscratch1, (uint64_t)0xdeadbeef);
__ orr(rscratch1, rscratch1, rscratch1, Assembler::LSL, 32);
for (Register r = r3; r <= r18; r++)
if (r != rscratch1) __ mov(r, rscratch1);
#endif
}
// Scan over array at a for count oops, verifying each one.
// Preserves a and count, clobbers rscratch1 and rscratch2.
void verify_oop_array (size_t size, Register a, Register count, Register temp) {
Label loop, end;
__ mov(rscratch1, a);
__ mov(rscratch2, zr);
__ bind(loop);
__ cmp(rscratch2, count);
__ br(Assembler::HS, end);
if (size == (size_t)wordSize) {
__ ldr(temp, Address(a, rscratch2, Address::lsl(exact_log2(size))));
__ verify_oop(temp);
} else {
__ ldrw(r16, Address(a, rscratch2, Address::lsl(exact_log2(size))));
__ decode_heap_oop(temp); // calls verify_oop
}
__ add(rscratch2, rscratch2, size);
__ b(loop);
__ bind(end);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// is_oop - true => oop array, so generate store check code
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4-byte boundaries, we let
// the hardware handle it. The two dwords within qwords that span
// cache line boundaries will still be loaded and stored atomicly.
//
// Side Effects:
// disjoint_int_copy_entry is set to the no-overlap entry point
// used by generate_conjoint_int_oop_copy().
//
address generate_disjoint_copy(size_t size, bool aligned, bool is_oop, address *entry,
const char *name, bool dest_uninitialized = false) {
Register s = c_rarg0, d = c_rarg1, count = c_rarg2;
RegSet saved_reg = RegSet::of(s, d, count);
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
__ enter();
if (entry != NULL) {
*entry = __ pc();
// caller can pass a 64-bit byte count here (from Unsafe.copyMemory)
BLOCK_COMMENT("Entry:");
}
DecoratorSet decorators = IN_HEAP | IS_ARRAY | ARRAYCOPY_DISJOINT;
if (dest_uninitialized) {
decorators |= IS_DEST_UNINITIALIZED;
}
if (aligned) {
decorators |= ARRAYCOPY_ALIGNED;
}
BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
bs->arraycopy_prologue(_masm, decorators, is_oop, s, d, count, saved_reg);
if (is_oop) {
// save regs before copy_memory
__ push(RegSet::of(d, count), sp);
}
{
// UnsafeCopyMemory page error: continue after ucm
bool add_entry = !is_oop && (!aligned || sizeof(jlong) == size);
UnsafeCopyMemoryMark ucmm(this, add_entry, true);
copy_memory(aligned, s, d, count, rscratch1, size);
}
if (is_oop) {
__ pop(RegSet::of(d, count), sp);
if (VerifyOops)
verify_oop_array(size, d, count, r16);
}
bs->arraycopy_epilogue(_masm, decorators, is_oop, d, count, rscratch1, RegSet());
__ leave();
__ mov(r0, zr); // return 0
__ ret(lr);
return start;
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// is_oop - true => oop array, so generate store check code
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4-byte boundaries, we let
// the hardware handle it. The two dwords within qwords that span
// cache line boundaries will still be loaded and stored atomicly.
//
address generate_conjoint_copy(size_t size, bool aligned, bool is_oop, address nooverlap_target,
address *entry, const char *name,
bool dest_uninitialized = false) {
Register s = c_rarg0, d = c_rarg1, count = c_rarg2;
RegSet saved_regs = RegSet::of(s, d, count);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
__ enter();
if (entry != NULL) {
*entry = __ pc();
// caller can pass a 64-bit byte count here (from Unsafe.copyMemory)
BLOCK_COMMENT("Entry:");
}
// use fwd copy when (d-s) above_equal (count*size)
__ sub(rscratch1, d, s);
__ cmp(rscratch1, count, Assembler::LSL, exact_log2(size));
__ br(Assembler::HS, nooverlap_target);
DecoratorSet decorators = IN_HEAP | IS_ARRAY;
if (dest_uninitialized) {
decorators |= IS_DEST_UNINITIALIZED;
}
if (aligned) {
decorators |= ARRAYCOPY_ALIGNED;
}
BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
bs->arraycopy_prologue(_masm, decorators, is_oop, s, d, count, saved_regs);
if (is_oop) {
// save regs before copy_memory
__ push(RegSet::of(d, count), sp);
}
{
// UnsafeCopyMemory page error: continue after ucm
bool add_entry = !is_oop && (!aligned || sizeof(jlong) == size);
UnsafeCopyMemoryMark ucmm(this, add_entry, true);
copy_memory(aligned, s, d, count, rscratch1, -size);
}
if (is_oop) {
__ pop(RegSet::of(d, count), sp);
if (VerifyOops)
verify_oop_array(size, d, count, r16);
}
bs->arraycopy_epilogue(_masm, decorators, is_oop, d, count, rscratch1, RegSet());
__ leave();
__ mov(r0, zr); // return 0
__ ret(lr);
return start;
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4-, 2-, or 1-byte boundaries,
// we let the hardware handle it. The one to eight bytes within words,
// dwords or qwords that span cache line boundaries will still be loaded
// and stored atomically.
//
// Side Effects:
// disjoint_byte_copy_entry is set to the no-overlap entry point //
// If 'from' and/or 'to' are aligned on 4-, 2-, or 1-byte boundaries,
// we let the hardware handle it. The one to eight bytes within words,
// dwords or qwords that span cache line boundaries will still be loaded
// and stored atomically.
//
// Side Effects:
// disjoint_byte_copy_entry is set to the no-overlap entry point
// used by generate_conjoint_byte_copy().
//
address generate_disjoint_byte_copy(bool aligned, address* entry, const char *name) {
const bool not_oop = false;
return generate_disjoint_copy(sizeof (jbyte), aligned, not_oop, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4-, 2-, or 1-byte boundaries,
// we let the hardware handle it. The one to eight bytes within words,
// dwords or qwords that span cache line boundaries will still be loaded
// and stored atomically.
//
address generate_conjoint_byte_copy(bool aligned, address nooverlap_target,
address* entry, const char *name) {
const bool not_oop = false;
return generate_conjoint_copy(sizeof (jbyte), aligned, not_oop, nooverlap_target, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4- or 2-byte boundaries, we
// let the hardware handle it. The two or four words within dwords
// or qwords that span cache line boundaries will still be loaded
// and stored atomically.
//
// Side Effects:
// disjoint_short_copy_entry is set to the no-overlap entry point
// used by generate_conjoint_short_copy().
//
address generate_disjoint_short_copy(bool aligned,
address* entry, const char *name) {
const bool not_oop = false;
return generate_disjoint_copy(sizeof (jshort), aligned, not_oop, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4- or 2-byte boundaries, we
// let the hardware handle it. The two or four words within dwords
// or qwords that span cache line boundaries will still be loaded
// and stored atomically.
//
address generate_conjoint_short_copy(bool aligned, address nooverlap_target,
address *entry, const char *name) {
const bool not_oop = false;
return generate_conjoint_copy(sizeof (jshort), aligned, not_oop, nooverlap_target, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4-byte boundaries, we let
// the hardware handle it. The two dwords within qwords that span
// cache line boundaries will still be loaded and stored atomicly.
//
// Side Effects:
// disjoint_int_copy_entry is set to the no-overlap entry point
// used by generate_conjoint_int_oop_copy().
//
address generate_disjoint_int_copy(bool aligned, address *entry,
const char *name, bool dest_uninitialized = false) {
const bool not_oop = false;
return generate_disjoint_copy(sizeof (jint), aligned, not_oop, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord == 8-byte boundary
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
//
// If 'from' and/or 'to' are aligned on 4-byte boundaries, we let
// the hardware handle it. The two dwords within qwords that span
// cache line boundaries will still be loaded and stored atomicly.
//
address generate_conjoint_int_copy(bool aligned, address nooverlap_target,
address *entry, const char *name,
bool dest_uninitialized = false) {
const bool not_oop = false;
return generate_conjoint_copy(sizeof (jint), aligned, not_oop, nooverlap_target, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord boundary == 8 bytes
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as size_t, can be zero
//
// Side Effects:
// disjoint_oop_copy_entry or disjoint_long_copy_entry is set to the
// no-overlap entry point used by generate_conjoint_long_oop_copy().
//
address generate_disjoint_long_copy(bool aligned, address *entry,
const char *name, bool dest_uninitialized = false) {
const bool not_oop = false;
return generate_disjoint_copy(sizeof (jlong), aligned, not_oop, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord boundary == 8 bytes
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as size_t, can be zero
//
address generate_conjoint_long_copy(bool aligned,
address nooverlap_target, address *entry,
const char *name, bool dest_uninitialized = false) {
const bool not_oop = false;
return generate_conjoint_copy(sizeof (jlong), aligned, not_oop, nooverlap_target, entry, name);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord boundary == 8 bytes
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as size_t, can be zero
//
// Side Effects:
// disjoint_oop_copy_entry or disjoint_long_copy_entry is set to the
// no-overlap entry point used by generate_conjoint_long_oop_copy().
//
address generate_disjoint_oop_copy(bool aligned, address *entry,
const char *name, bool dest_uninitialized) {
const bool is_oop = true;
const size_t size = UseCompressedOops ? sizeof (jint) : sizeof (jlong);
return generate_disjoint_copy(size, aligned, is_oop, entry, name, dest_uninitialized);
}
// Arguments:
// aligned - true => Input and output aligned on a HeapWord boundary == 8 bytes
// ignored
// name - stub name string
//
// Inputs:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as size_t, can be zero
//
address generate_conjoint_oop_copy(bool aligned,
address nooverlap_target, address *entry,
const char *name, bool dest_uninitialized) {
const bool is_oop = true;
const size_t size = UseCompressedOops ? sizeof (jint) : sizeof (jlong);
return generate_conjoint_copy(size, aligned, is_oop, nooverlap_target, entry,
name, dest_uninitialized);
}
// Helper for generating a dynamic type check.
// Smashes rscratch1, rscratch2.
void generate_type_check(Register sub_klass,
Register super_check_offset,
Register super_klass,
Label& L_success) {
assert_different_registers(sub_klass, super_check_offset, super_klass);
BLOCK_COMMENT("type_check:");
Label L_miss;
__ check_klass_subtype_fast_path(sub_klass, super_klass, noreg, &L_success, &L_miss, NULL,
super_check_offset);
__ check_klass_subtype_slow_path(sub_klass, super_klass, noreg, noreg, &L_success, NULL);
// Fall through on failure!
__ BIND(L_miss);
}
//
// Generate checkcasting array copy stub
//
// Input:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - element count, treated as ssize_t, can be zero
// c_rarg3 - size_t ckoff (super_check_offset)
// c_rarg4 - oop ckval (super_klass)
//
// Output:
// r0 == 0 - success
// r0 == -1^K - failure, where K is partial transfer count
//
address generate_checkcast_copy(const char *name, address *entry,
bool dest_uninitialized = false) {
Label L_load_element, L_store_element, L_do_card_marks, L_done, L_done_pop;
// Input registers (after setup_arg_regs)
const Register from = c_rarg0; // source array address
const Register to = c_rarg1; // destination array address
const Register count = c_rarg2; // elementscount
const Register ckoff = c_rarg3; // super_check_offset
const Register ckval = c_rarg4; // super_klass
RegSet wb_pre_saved_regs = RegSet::range(c_rarg0, c_rarg4);
RegSet wb_post_saved_regs = RegSet::of(count);
// Registers used as temps (r18, r19, r20 are save-on-entry)
const Register count_save = r21; // orig elementscount
const Register start_to = r20; // destination array start address
const Register copied_oop = r18; // actual oop copied
const Register r19_klass = r19; // oop._klass
//---------------------------------------------------------------
// Assembler stub will be used for this call to arraycopy
// if the two arrays are subtypes of Object[] but the
// destination array type is not equal to or a supertype
// of the source type. Each element must be separately
// checked.
assert_different_registers(from, to, count, ckoff, ckval, start_to,
copied_oop, r19_klass, count_save);
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
__ enter(); // required for proper stackwalking of RuntimeStub frame
#ifdef ASSERT
// caller guarantees that the arrays really are different
// otherwise, we would have to make conjoint checks
{ Label L;
array_overlap_test(L, TIMES_OOP);
__ stop("checkcast_copy within a single array");
__ bind(L);
}
#endif //ASSERT
// Caller of this entry point must set up the argument registers.
if (entry != NULL) {
*entry = __ pc();
BLOCK_COMMENT("Entry:");
}
// Empty array: Nothing to do.
__ cbz(count, L_done);
__ push(RegSet::of(r18, r19, r20, r21), sp);
#ifdef ASSERT
BLOCK_COMMENT("assert consistent ckoff/ckval");
// The ckoff and ckval must be mutually consistent,
// even though caller generates both.
{ Label L;
int sco_offset = in_bytes(Klass::super_check_offset_offset());
__ ldrw(start_to, Address(ckval, sco_offset));
__ cmpw(ckoff, start_to);
__ br(Assembler::EQ, L);
__ stop("super_check_offset inconsistent");
__ bind(L);
}
#endif //ASSERT
DecoratorSet decorators = IN_HEAP | IS_ARRAY | ARRAYCOPY_CHECKCAST | ARRAYCOPY_DISJOINT;
bool is_oop = true;
if (dest_uninitialized) {
decorators |= IS_DEST_UNINITIALIZED;
}
BarrierSetAssembler *bs = BarrierSet::barrier_set()->barrier_set_assembler();
bs->arraycopy_prologue(_masm, decorators, is_oop, from, to, count, wb_pre_saved_regs);
// save the original count
__ mov(count_save, count);
// Copy from low to high addresses
__ mov(start_to, to); // Save destination array start address
__ b(L_load_element);
// ======== begin loop ========
// (Loop is rotated; its entry is L_load_element.)
// Loop control:
// for (; count != 0; count--) {
// copied_oop = load_heap_oop(from++);
// ... generate_type_check ...;
// store_heap_oop(to++, copied_oop);
// }
__ align(OptoLoopAlignment);
__ BIND(L_store_element);
__ store_heap_oop(__ post(to, UseCompressedOops ? 4 : 8), copied_oop, noreg, noreg, AS_RAW); // store the oop
__ sub(count, count, 1);
__ cbz(count, L_do_card_marks);
// ======== loop entry is here ========
__ BIND(L_load_element);
__ load_heap_oop(copied_oop, __ post(from, UseCompressedOops ? 4 : 8), noreg, noreg, AS_RAW); // load the oop
__ cbz(copied_oop, L_store_element);
__ load_klass(r19_klass, copied_oop);// query the object klass
generate_type_check(r19_klass, ckoff, ckval, L_store_element);
// ======== end loop ========
// It was a real error; we must depend on the caller to finish the job.
// Register count = remaining oops, count_orig = total oops.
// Emit GC store barriers for the oops we have copied and report
// their number to the caller.
__ subs(count, count_save, count); // K = partially copied oop count
__ eon(count, count, zr); // report (-1^K) to caller
__ br(Assembler::EQ, L_done_pop);
__ BIND(L_do_card_marks);
bs->arraycopy_epilogue(_masm, decorators, is_oop, start_to, count_save, rscratch1, wb_post_saved_regs);
__ bind(L_done_pop);
__ pop(RegSet::of(r18, r19, r20, r21), sp);
inc_counter_np(SharedRuntime::_checkcast_array_copy_ctr);
__ bind(L_done);
__ mov(r0, count);
__ leave();
__ ret(lr);
return start;
}
// Perform range checks on the proposed arraycopy.
// Kills temp, but nothing else.
// Also, clean the sign bits of src_pos and dst_pos.
void arraycopy_range_checks(Register src, // source array oop (c_rarg0)
Register src_pos, // source position (c_rarg1)
Register dst, // destination array oo (c_rarg2)
Register dst_pos, // destination position (c_rarg3)
Register length,
Register temp,
Label& L_failed) {
BLOCK_COMMENT("arraycopy_range_checks:");
assert_different_registers(rscratch1, temp);
// if (src_pos + length > arrayOop(src)->length()) FAIL;
__ ldrw(rscratch1, Address(src, arrayOopDesc::length_offset_in_bytes()));
__ addw(temp, length, src_pos);
__ cmpw(temp, rscratch1);
__ br(Assembler::HI, L_failed);
// if (dst_pos + length > arrayOop(dst)->length()) FAIL;
__ ldrw(rscratch1, Address(dst, arrayOopDesc::length_offset_in_bytes()));
__ addw(temp, length, dst_pos);
__ cmpw(temp, rscratch1);
__ br(Assembler::HI, L_failed);
// Have to clean up high 32 bits of 'src_pos' and 'dst_pos'.
__ movw(src_pos, src_pos);
__ movw(dst_pos, dst_pos);
BLOCK_COMMENT("arraycopy_range_checks done");
}
// These stubs get called from some dumb test routine.
// I'll write them properly when they're called from
// something that's actually doing something.
static void fake_arraycopy_stub(address src, address dst, int count) {
assert(count == 0, "huh?");
}
//
// Generate 'unsafe' array copy stub
// Though just as safe as the other stubs, it takes an unscaled
// size_t argument instead of an element count.
//
// Input:
// c_rarg0 - source array address
// c_rarg1 - destination array address
// c_rarg2 - byte count, treated as ssize_t, can be zero
//
// Examines the alignment of the operands and dispatches
// to a long, int, short, or byte copy loop.
//
address generate_unsafe_copy(const char *name,
address byte_copy_entry,
address short_copy_entry,
address int_copy_entry,
address long_copy_entry) {
Label L_long_aligned, L_int_aligned, L_short_aligned;
Register s = c_rarg0, d = c_rarg1, count = c_rarg2;
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
__ enter(); // required for proper stackwalking of RuntimeStub frame
// bump this on entry, not on exit:
inc_counter_np(SharedRuntime::_unsafe_array_copy_ctr);
__ orr(rscratch1, s, d);
__ orr(rscratch1, rscratch1, count);
__ andr(rscratch1, rscratch1, BytesPerLong-1);
__ cbz(rscratch1, L_long_aligned);
__ andr(rscratch1, rscratch1, BytesPerInt-1);
__ cbz(rscratch1, L_int_aligned);
__ tbz(rscratch1, 0, L_short_aligned);
__ b(RuntimeAddress(byte_copy_entry));
__ BIND(L_short_aligned);
__ lsr(count, count, LogBytesPerShort); // size => short_count
__ b(RuntimeAddress(short_copy_entry));
__ BIND(L_int_aligned);
__ lsr(count, count, LogBytesPerInt); // size => int_count
__ b(RuntimeAddress(int_copy_entry));
__ BIND(L_long_aligned);
__ lsr(count, count, LogBytesPerLong); // size => long_count
__ b(RuntimeAddress(long_copy_entry));
return start;
}
//
// Generate generic array copy stubs
//
// Input:
// c_rarg0 - src oop
// c_rarg1 - src_pos (32-bits)
// c_rarg2 - dst oop
// c_rarg3 - dst_pos (32-bits)
// c_rarg4 - element count (32-bits)
//
// Output:
// r0 == 0 - success
// r0 == -1^K - failure, where K is partial transfer count
//
address generate_generic_copy(const char *name,
address byte_copy_entry, address short_copy_entry,
address int_copy_entry, address oop_copy_entry,
address long_copy_entry, address checkcast_copy_entry) {
Label L_failed, L_objArray;
Label L_copy_bytes, L_copy_shorts, L_copy_ints, L_copy_longs;
// Input registers
const Register src = c_rarg0; // source array oop
const Register src_pos = c_rarg1; // source position
const Register dst = c_rarg2; // destination array oop
const Register dst_pos = c_rarg3; // destination position
const Register length = c_rarg4;
// Registers used as temps
const Register dst_klass = c_rarg5;
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
__ enter(); // required for proper stackwalking of RuntimeStub frame
// bump this on entry, not on exit:
inc_counter_np(SharedRuntime::_generic_array_copy_ctr);
//-----------------------------------------------------------------------
// Assembler stub will be used for this call to arraycopy
// if the following conditions are met:
//
// (1) src and dst must not be null.
// (2) src_pos must not be negative.
// (3) dst_pos must not be negative.
// (4) length must not be negative.
// (5) src klass and dst klass should be the same and not NULL.
// (6) src and dst should be arrays.
// (7) src_pos + length must not exceed length of src.
// (8) dst_pos + length must not exceed length of dst.
//
// if (src == NULL) return -1;
__ cbz(src, L_failed);
// if (src_pos < 0) return -1;
__ tbnz(src_pos, 31, L_failed); // i.e. sign bit set
// if (dst == NULL) return -1;
__ cbz(dst, L_failed);
// if (dst_pos < 0) return -1;
__ tbnz(dst_pos, 31, L_failed); // i.e. sign bit set
// registers used as temp
const Register scratch_length = r16; // elements count to copy
const Register scratch_src_klass = r17; // array klass
const Register lh = r18; // layout helper
// if (length < 0) return -1;
__ movw(scratch_length, length); // length (elements count, 32-bits value)
__ tbnz(scratch_length, 31, L_failed); // i.e. sign bit set
__ load_klass(scratch_src_klass, src);
#ifdef ASSERT
// assert(src->klass() != NULL);
{
BLOCK_COMMENT("assert klasses not null {");
Label L1, L2;
__ cbnz(scratch_src_klass, L2); // it is broken if klass is NULL
__ bind(L1);
__ stop("broken null klass");
__ bind(L2);
__ load_klass(rscratch1, dst);
__ cbz(rscratch1, L1); // this would be broken also
BLOCK_COMMENT("} assert klasses not null done");
}
#endif
// Load layout helper (32-bits)
//
// |array_tag| | header_size | element_type | |log2_element_size|
// 32 30 24 16 8 2 0
//
// array_tag: typeArray = 0x3, objArray = 0x2, non-array = 0x0
//
const int lh_offset = in_bytes(Klass::layout_helper_offset());
// Handle objArrays completely differently...
const jint objArray_lh = Klass::array_layout_helper(T_OBJECT);
__ ldrw(lh, Address(scratch_src_klass, lh_offset));
__ movw(rscratch1, objArray_lh);
__ eorw(rscratch2, lh, rscratch1);
__ cbzw(rscratch2, L_objArray);
// if (src->klass() != dst->klass()) return -1;
__ load_klass(rscratch2, dst);
__ eor(rscratch2, rscratch2, scratch_src_klass);
__ cbnz(rscratch2, L_failed);
// if (!src->is_Array()) return -1;
__ tbz(lh, 31, L_failed); // i.e. (lh >= 0)
// At this point, it is known to be a typeArray (array_tag 0x3).
#ifdef ASSERT
{
BLOCK_COMMENT("assert primitive array {");
Label L;
__ movw(rscratch2, Klass::_lh_array_tag_type_value << Klass::_lh_array_tag_shift);
__ cmpw(lh, rscratch2);
__ br(Assembler::GE, L);
__ stop("must be a primitive array");
__ bind(L);
BLOCK_COMMENT("} assert primitive array done");
}
#endif
arraycopy_range_checks(src, src_pos, dst, dst_pos, scratch_length,
rscratch2, L_failed);
// TypeArrayKlass
//
// src_addr = (src + array_header_in_bytes()) + (src_pos << log2elemsize);
// dst_addr = (dst + array_header_in_bytes()) + (dst_pos << log2elemsize);
//
const Register rscratch1_offset = rscratch1; // array offset
const Register r18_elsize = lh; // element size
__ ubfx(rscratch1_offset, lh, Klass::_lh_header_size_shift,
exact_log2(Klass::_lh_header_size_mask+1)); // array_offset
__ add(src, src, rscratch1_offset); // src array offset
__ add(dst, dst, rscratch1_offset); // dst array offset
BLOCK_COMMENT("choose copy loop based on element size");
// next registers should be set before the jump to corresponding stub
const Register from = c_rarg0; // source array address
const Register to = c_rarg1; // destination array address
const Register count = c_rarg2; // elements count
// 'from', 'to', 'count' registers should be set in such order
// since they are the same as 'src', 'src_pos', 'dst'.
assert(Klass::_lh_log2_element_size_shift == 0, "fix this code");
// The possible values of elsize are 0-3, i.e. exact_log2(element
// size in bytes). We do a simple bitwise binary search.
__ BIND(L_copy_bytes);
__ tbnz(r18_elsize, 1, L_copy_ints);
__ tbnz(r18_elsize, 0, L_copy_shorts);
__ lea(from, Address(src, src_pos));// src_addr
__ lea(to, Address(dst, dst_pos));// dst_addr
__ movw(count, scratch_length); // length
__ b(RuntimeAddress(byte_copy_entry));
__ BIND(L_copy_shorts);
__ lea(from, Address(src, src_pos, Address::lsl(1)));// src_addr
__ lea(to, Address(dst, dst_pos, Address::lsl(1)));// dst_addr
__ movw(count, scratch_length); // length
__ b(RuntimeAddress(short_copy_entry));
__ BIND(L_copy_ints);
__ tbnz(r18_elsize, 0, L_copy_longs);
__ lea(from, Address(src, src_pos, Address::lsl(2)));// src_addr
__ lea(to, Address(dst, dst_pos, Address::lsl(2)));// dst_addr
__ movw(count, scratch_length); // length
__ b(RuntimeAddress(int_copy_entry));
__ BIND(L_copy_longs);
#ifdef ASSERT
{
BLOCK_COMMENT("assert long copy {");
Label L;
__ andw(lh, lh, Klass::_lh_log2_element_size_mask); // lh -> r18_elsize
__ cmpw(r18_elsize, LogBytesPerLong);
__ br(Assembler::EQ, L);
__ stop("must be long copy, but elsize is wrong");
__ bind(L);
BLOCK_COMMENT("} assert long copy done");
}
#endif
__ lea(from, Address(src, src_pos, Address::lsl(3)));// src_addr
__ lea(to, Address(dst, dst_pos, Address::lsl(3)));// dst_addr
__ movw(count, scratch_length); // length
__ b(RuntimeAddress(long_copy_entry));
// ObjArrayKlass
__ BIND(L_objArray);
// live at this point: scratch_src_klass, scratch_length, src[_pos], dst[_pos]
Label L_plain_copy, L_checkcast_copy;
// test array classes for subtyping
__ load_klass(r18, dst);
__ cmp(scratch_src_klass, r18); // usual case is exact equality
__ br(Assembler::NE, L_checkcast_copy);
// Identically typed arrays can be copied without element-wise checks.
arraycopy_range_checks(src, src_pos, dst, dst_pos, scratch_length,
rscratch2, L_failed);
__ lea(from, Address(src, src_pos, Address::lsl(LogBytesPerHeapOop)));
__ add(from, from, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
__ lea(to, Address(dst, dst_pos, Address::lsl(LogBytesPerHeapOop)));
__ add(to, to, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
__ movw(count, scratch_length); // length
__ BIND(L_plain_copy);
__ b(RuntimeAddress(oop_copy_entry));
__ BIND(L_checkcast_copy);
// live at this point: scratch_src_klass, scratch_length, r18 (dst_klass)
{
// Before looking at dst.length, make sure dst is also an objArray.
__ ldrw(rscratch1, Address(r18, lh_offset));
__ movw(rscratch2, objArray_lh);
__ eorw(rscratch1, rscratch1, rscratch2);
__ cbnzw(rscratch1, L_failed);
// It is safe to examine both src.length and dst.length.
arraycopy_range_checks(src, src_pos, dst, dst_pos, scratch_length,
r18, L_failed);
__ load_klass(dst_klass, dst); // reload
// Marshal the base address arguments now, freeing registers.
__ lea(from, Address(src, src_pos, Address::lsl(LogBytesPerHeapOop)));
__ add(from, from, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
__ lea(to, Address(dst, dst_pos, Address::lsl(LogBytesPerHeapOop)));
__ add(to, to, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
__ movw(count, length); // length (reloaded)
Register sco_temp = c_rarg3; // this register is free now
assert_different_registers(from, to, count, sco_temp,
dst_klass, scratch_src_klass);
// assert_clean_int(count, sco_temp);
// Generate the type check.
const int sco_offset = in_bytes(Klass::super_check_offset_offset());
__ ldrw(sco_temp, Address(dst_klass, sco_offset));
// Smashes rscratch1, rscratch2
generate_type_check(scratch_src_klass, sco_temp, dst_klass, L_plain_copy);
// Fetch destination element klass from the ObjArrayKlass header.
int ek_offset = in_bytes(ObjArrayKlass::element_klass_offset());
__ ldr(dst_klass, Address(dst_klass, ek_offset));
__ ldrw(sco_temp, Address(dst_klass, sco_offset));
// the checkcast_copy loop needs two extra arguments:
assert(c_rarg3 == sco_temp, "#3 already in place");
// Set up arguments for checkcast_copy_entry.
__ mov(c_rarg4, dst_klass); // dst.klass.element_klass
__ b(RuntimeAddress(checkcast_copy_entry));
}
__ BIND(L_failed);
__ mov(r0, -1);
__ leave(); // required for proper stackwalking of RuntimeStub frame
__ ret(lr);
return start;
}
//
// Generate stub for array fill. If "aligned" is true, the
// "to" address is assumed to be heapword aligned.
//
// Arguments for generated stub:
// to: c_rarg0
// value: c_rarg1
// count: c_rarg2 treated as signed
//
address generate_fill(BasicType t, bool aligned, const char *name) {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
BLOCK_COMMENT("Entry:");
const Register to = c_rarg0; // source array address
const Register value = c_rarg1; // value
const Register count = c_rarg2; // elements count
const Register bz_base = r10; // base for block_zero routine
const Register cnt_words = r11; // temp register
__ enter();
Label L_fill_elements, L_exit1;
int shift = -1;
switch (t) {
case T_BYTE:
shift = 0;
__ cmpw(count, 8 >> shift); // Short arrays (< 8 bytes) fill by element
__ bfi(value, value, 8, 8); // 8 bit -> 16 bit
__ bfi(value, value, 16, 16); // 16 bit -> 32 bit
__ br(Assembler::LO, L_fill_elements);
break;
case T_SHORT:
shift = 1;
__ cmpw(count, 8 >> shift); // Short arrays (< 8 bytes) fill by element
__ bfi(value, value, 16, 16); // 16 bit -> 32 bit
__ br(Assembler::LO, L_fill_elements);
break;
case T_INT:
shift = 2;
__ cmpw(count, 8 >> shift); // Short arrays (< 8 bytes) fill by element
__ br(Assembler::LO, L_fill_elements);
break;
default: ShouldNotReachHere();
}
// Align source address at 8 bytes address boundary.
Label L_skip_align1, L_skip_align2, L_skip_align4;
if (!aligned) {
switch (t) {
case T_BYTE:
// One byte misalignment happens only for byte arrays.
__ tbz(to, 0, L_skip_align1);
__ strb(value, Address(__ post(to, 1)));
__ subw(count, count, 1);
__ bind(L_skip_align1);
// Fallthrough
case T_SHORT:
// Two bytes misalignment happens only for byte and short (char) arrays.
__ tbz(to, 1, L_skip_align2);
__ strh(value, Address(__ post(to, 2)));
__ subw(count, count, 2 >> shift);
__ bind(L_skip_align2);
// Fallthrough
case T_INT:
// Align to 8 bytes, we know we are 4 byte aligned to start.
__ tbz(to, 2, L_skip_align4);
__ strw(value, Address(__ post(to, 4)));
__ subw(count, count, 4 >> shift);
__ bind(L_skip_align4);
break;
default: ShouldNotReachHere();
}
}
//
// Fill large chunks
//
__ lsrw(cnt_words, count, 3 - shift); // number of words
__ bfi(value, value, 32, 32); // 32 bit -> 64 bit
__ subw(count, count, cnt_words, Assembler::LSL, 3 - shift);
if (UseBlockZeroing) {
Label non_block_zeroing, rest;
// If the fill value is zero we can use the fast zero_words().
__ cbnz(value, non_block_zeroing);
__ mov(bz_base, to);
__ add(to, to, cnt_words, Assembler::LSL, LogBytesPerWord);
__ zero_words(bz_base, cnt_words);
__ b(rest);
__ bind(non_block_zeroing);
__ fill_words(to, cnt_words, value);
__ bind(rest);
} else {
__ fill_words(to, cnt_words, value);
}
// Remaining count is less than 8 bytes. Fill it by a single store.
// Note that the total length is no less than 8 bytes.
if (t == T_BYTE || t == T_SHORT) {
Label L_exit1;
__ cbzw(count, L_exit1);
__ add(to, to, count, Assembler::LSL, shift); // points to the end
__ str(value, Address(to, -8)); // overwrite some elements
__ bind(L_exit1);
__ leave();
__ ret(lr);
}
// Handle copies less than 8 bytes.
Label L_fill_2, L_fill_4, L_exit2;
__ bind(L_fill_elements);
switch (t) {
case T_BYTE:
__ tbz(count, 0, L_fill_2);
__ strb(value, Address(__ post(to, 1)));
__ bind(L_fill_2);
__ tbz(count, 1, L_fill_4);
__ strh(value, Address(__ post(to, 2)));
__ bind(L_fill_4);
__ tbz(count, 2, L_exit2);
__ strw(value, Address(to));
break;
case T_SHORT:
__ tbz(count, 0, L_fill_4);
__ strh(value, Address(__ post(to, 2)));
__ bind(L_fill_4);
__ tbz(count, 1, L_exit2);
__ strw(value, Address(to));
break;
case T_INT:
__ cbzw(count, L_exit2);
__ strw(value, Address(to));
break;
default: ShouldNotReachHere();
}
__ bind(L_exit2);
__ leave();
__ ret(lr);
return start;
}
address generate_data_cache_writeback() {
const Register line = c_rarg0; // address of line to write back
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "_data_cache_writeback");
address start = __ pc();
__ enter();
__ cache_wb(Address(line, 0));
__ leave();
__ ret(lr);
return start;
}
address generate_data_cache_writeback_sync() {
const Register is_pre = c_rarg0; // pre or post sync
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "_data_cache_writeback_sync");
// pre wbsync is a no-op
// post wbsync translates to an sfence
Label skip;
address start = __ pc();
__ enter();
__ cbnz(is_pre, skip);
__ cache_wbsync(false);
__ bind(skip);
__ leave();
__ ret(lr);
return start;
}
void generate_arraycopy_stubs() {
address entry;
address entry_jbyte_arraycopy;
address entry_jshort_arraycopy;
address entry_jint_arraycopy;
address entry_oop_arraycopy;
address entry_jlong_arraycopy;
address entry_checkcast_arraycopy;
generate_copy_longs(copy_f, r0, r1, rscratch2, copy_forwards);
generate_copy_longs(copy_b, r0, r1, rscratch2, copy_backwards);
StubRoutines::aarch64::_zero_blocks = generate_zero_blocks();
//*** jbyte
// Always need aligned and unaligned versions
StubRoutines::_jbyte_disjoint_arraycopy = generate_disjoint_byte_copy(false, &entry,
"jbyte_disjoint_arraycopy");
StubRoutines::_jbyte_arraycopy = generate_conjoint_byte_copy(false, entry,
&entry_jbyte_arraycopy,
"jbyte_arraycopy");
StubRoutines::_arrayof_jbyte_disjoint_arraycopy = generate_disjoint_byte_copy(true, &entry,
"arrayof_jbyte_disjoint_arraycopy");
StubRoutines::_arrayof_jbyte_arraycopy = generate_conjoint_byte_copy(true, entry, NULL,
"arrayof_jbyte_arraycopy");
//*** jshort
// Always need aligned and unaligned versions
StubRoutines::_jshort_disjoint_arraycopy = generate_disjoint_short_copy(false, &entry,
"jshort_disjoint_arraycopy");
StubRoutines::_jshort_arraycopy = generate_conjoint_short_copy(false, entry,
&entry_jshort_arraycopy,
"jshort_arraycopy");
StubRoutines::_arrayof_jshort_disjoint_arraycopy = generate_disjoint_short_copy(true, &entry,
"arrayof_jshort_disjoint_arraycopy");
StubRoutines::_arrayof_jshort_arraycopy = generate_conjoint_short_copy(true, entry, NULL,
"arrayof_jshort_arraycopy");
//*** jint
// Aligned versions
StubRoutines::_arrayof_jint_disjoint_arraycopy = generate_disjoint_int_copy(true, &entry,
"arrayof_jint_disjoint_arraycopy");
StubRoutines::_arrayof_jint_arraycopy = generate_conjoint_int_copy(true, entry, &entry_jint_arraycopy,
"arrayof_jint_arraycopy");
// In 64 bit we need both aligned and unaligned versions of jint arraycopy.
// entry_jint_arraycopy always points to the unaligned version
StubRoutines::_jint_disjoint_arraycopy = generate_disjoint_int_copy(false, &entry,
"jint_disjoint_arraycopy");
StubRoutines::_jint_arraycopy = generate_conjoint_int_copy(false, entry,
&entry_jint_arraycopy,
"jint_arraycopy");
//*** jlong
// It is always aligned
StubRoutines::_arrayof_jlong_disjoint_arraycopy = generate_disjoint_long_copy(true, &entry,
"arrayof_jlong_disjoint_arraycopy");
StubRoutines::_arrayof_jlong_arraycopy = generate_conjoint_long_copy(true, entry, &entry_jlong_arraycopy,
"arrayof_jlong_arraycopy");
StubRoutines::_jlong_disjoint_arraycopy = StubRoutines::_arrayof_jlong_disjoint_arraycopy;
StubRoutines::_jlong_arraycopy = StubRoutines::_arrayof_jlong_arraycopy;
//*** oops
{
// With compressed oops we need unaligned versions; notice that
// we overwrite entry_oop_arraycopy.
bool aligned = !UseCompressedOops;
StubRoutines::_arrayof_oop_disjoint_arraycopy
= generate_disjoint_oop_copy(aligned, &entry, "arrayof_oop_disjoint_arraycopy",
/*dest_uninitialized*/false);
StubRoutines::_arrayof_oop_arraycopy
= generate_conjoint_oop_copy(aligned, entry, &entry_oop_arraycopy, "arrayof_oop_arraycopy",
/*dest_uninitialized*/false);
// Aligned versions without pre-barriers
StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit
= generate_disjoint_oop_copy(aligned, &entry, "arrayof_oop_disjoint_arraycopy_uninit",
/*dest_uninitialized*/true);
StubRoutines::_arrayof_oop_arraycopy_uninit
= generate_conjoint_oop_copy(aligned, entry, NULL, "arrayof_oop_arraycopy_uninit",
/*dest_uninitialized*/true);
}
StubRoutines::_oop_disjoint_arraycopy = StubRoutines::_arrayof_oop_disjoint_arraycopy;
StubRoutines::_oop_arraycopy = StubRoutines::_arrayof_oop_arraycopy;
StubRoutines::_oop_disjoint_arraycopy_uninit = StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit;
StubRoutines::_oop_arraycopy_uninit = StubRoutines::_arrayof_oop_arraycopy_uninit;
StubRoutines::_checkcast_arraycopy = generate_checkcast_copy("checkcast_arraycopy", &entry_checkcast_arraycopy);
StubRoutines::_checkcast_arraycopy_uninit = generate_checkcast_copy("checkcast_arraycopy_uninit", NULL,
/*dest_uninitialized*/true);
StubRoutines::_unsafe_arraycopy = generate_unsafe_copy("unsafe_arraycopy",
entry_jbyte_arraycopy,
entry_jshort_arraycopy,
entry_jint_arraycopy,
entry_jlong_arraycopy);
StubRoutines::_generic_arraycopy = generate_generic_copy("generic_arraycopy",
entry_jbyte_arraycopy,
entry_jshort_arraycopy,
entry_jint_arraycopy,
entry_oop_arraycopy,
entry_jlong_arraycopy,
entry_checkcast_arraycopy);
StubRoutines::_jbyte_fill = generate_fill(T_BYTE, false, "jbyte_fill");
StubRoutines::_jshort_fill = generate_fill(T_SHORT, false, "jshort_fill");
StubRoutines::_jint_fill = generate_fill(T_INT, false, "jint_fill");
StubRoutines::_arrayof_jbyte_fill = generate_fill(T_BYTE, true, "arrayof_jbyte_fill");
StubRoutines::_arrayof_jshort_fill = generate_fill(T_SHORT, true, "arrayof_jshort_fill");
StubRoutines::_arrayof_jint_fill = generate_fill(T_INT, true, "arrayof_jint_fill");
}
void generate_math_stubs() { Unimplemented(); }
// Arguments:
//
// Inputs:
// c_rarg0 - source byte array address
// c_rarg1 - destination byte array address
// c_rarg2 - K (key) in little endian int array
//
address generate_aescrypt_encryptBlock() {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "aescrypt_encryptBlock");
Label L_doLast;
const Register from = c_rarg0; // source array address
const Register to = c_rarg1; // destination array address
const Register key = c_rarg2; // key array address
const Register keylen = rscratch1;
address start = __ pc();
__ enter();
__ ldrw(keylen, Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)));
__ ld1(v0, __ T16B, from); // get 16 bytes of input
__ ld1(v1, v2, v3, v4, __ T16B, __ post(key, 64));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ rev32(v3, __ T16B, v3);
__ rev32(v4, __ T16B, v4);
__ aese(v0, v1);
__ aesmc(v0, v0);
__ aese(v0, v2);
__ aesmc(v0, v0);
__ aese(v0, v3);
__ aesmc(v0, v0);
__ aese(v0, v4);
__ aesmc(v0, v0);
__ ld1(v1, v2, v3, v4, __ T16B, __ post(key, 64));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ rev32(v3, __ T16B, v3);
__ rev32(v4, __ T16B, v4);
__ aese(v0, v1);
__ aesmc(v0, v0);
__ aese(v0, v2);
__ aesmc(v0, v0);
__ aese(v0, v3);
__ aesmc(v0, v0);
__ aese(v0, v4);
__ aesmc(v0, v0);
__ ld1(v1, v2, __ T16B, __ post(key, 32));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ cmpw(keylen, 44);
__ br(Assembler::EQ, L_doLast);
__ aese(v0, v1);
__ aesmc(v0, v0);
__ aese(v0, v2);
__ aesmc(v0, v0);
__ ld1(v1, v2, __ T16B, __ post(key, 32));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ cmpw(keylen, 52);
__ br(Assembler::EQ, L_doLast);
__ aese(v0, v1);
__ aesmc(v0, v0);
__ aese(v0, v2);
__ aesmc(v0, v0);
__ ld1(v1, v2, __ T16B, __ post(key, 32));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ BIND(L_doLast);
__ aese(v0, v1);
__ aesmc(v0, v0);
__ aese(v0, v2);
__ ld1(v1, __ T16B, key);
__ rev32(v1, __ T16B, v1);
__ eor(v0, __ T16B, v0, v1);
__ st1(v0, __ T16B, to);
__ mov(r0, 0);
__ leave();
__ ret(lr);
return start;
}
// Arguments:
//
// Inputs:
// c_rarg0 - source byte array address
// c_rarg1 - destination byte array address
// c_rarg2 - K (key) in little endian int array
//
address generate_aescrypt_decryptBlock() {
assert(UseAES, "need AES instructions and misaligned SSE support");
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "aescrypt_decryptBlock");
Label L_doLast;
const Register from = c_rarg0; // source array address
const Register to = c_rarg1; // destination array address
const Register key = c_rarg2; // key array address
const Register keylen = rscratch1;
address start = __ pc();
__ enter(); // required for proper stackwalking of RuntimeStub frame
__ ldrw(keylen, Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)));
__ ld1(v0, __ T16B, from); // get 16 bytes of input
__ ld1(v5, __ T16B, __ post(key, 16));
__ rev32(v5, __ T16B, v5);
__ ld1(v1, v2, v3, v4, __ T16B, __ post(key, 64));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ rev32(v3, __ T16B, v3);
__ rev32(v4, __ T16B, v4);
__ aesd(v0, v1);
__ aesimc(v0, v0);
__ aesd(v0, v2);
__ aesimc(v0, v0);
__ aesd(v0, v3);
__ aesimc(v0, v0);
__ aesd(v0, v4);
__ aesimc(v0, v0);
__ ld1(v1, v2, v3, v4, __ T16B, __ post(key, 64));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ rev32(v3, __ T16B, v3);
__ rev32(v4, __ T16B, v4);
__ aesd(v0, v1);
__ aesimc(v0, v0);
__ aesd(v0, v2);
__ aesimc(v0, v0);
__ aesd(v0, v3);
__ aesimc(v0, v0);
__ aesd(v0, v4);
__ aesimc(v0, v0);
__ ld1(v1, v2, __ T16B, __ post(key, 32));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ cmpw(keylen, 44);
__ br(Assembler::EQ, L_doLast);
__ aesd(v0, v1);
__ aesimc(v0, v0);
__ aesd(v0, v2);
__ aesimc(v0, v0);
__ ld1(v1, v2, __ T16B, __ post(key, 32));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ cmpw(keylen, 52);
__ br(Assembler::EQ, L_doLast);
__ aesd(v0, v1);
__ aesimc(v0, v0);
__ aesd(v0, v2);
__ aesimc(v0, v0);
__ ld1(v1, v2, __ T16B, __ post(key, 32));
__ rev32(v1, __ T16B, v1);
__ rev32(v2, __ T16B, v2);
__ BIND(L_doLast);
__ aesd(v0, v1);
__ aesimc(v0, v0);
__ aesd(v0, v2);
__ eor(v0, __ T16B, v0, v5);
__ st1(v0, __ T16B, to);
__ mov(r0, 0);
__ leave();
__ ret(lr);
return start;
}
// Arguments:
//
// Inputs:
// c_rarg0 - source byte array address
// c_rarg1 - destination byte array address
// c_rarg2 - K (key) in little endian int array
// c_rarg3 - r vector byte array address
// c_rarg4 - input length
//
// Output:
// x0 - input length
//
address generate_cipherBlockChaining_encryptAESCrypt() {
assert(UseAES, "need AES instructions and misaligned SSE support");
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "cipherBlockChaining_encryptAESCrypt");
Label L_loadkeys_44, L_loadkeys_52, L_aes_loop, L_rounds_44, L_rounds_52;
const Register from = c_rarg0; // source array address
const Register to = c_rarg1; // destination array address
const Register key = c_rarg2; // key array address
const Register rvec = c_rarg3; // r byte array initialized from initvector array address
// and left with the results of the last encryption block
const Register len_reg = c_rarg4; // src len (must be multiple of blocksize 16)
const Register keylen = rscratch1;
address start = __ pc();
__ enter();
__ movw(rscratch2, len_reg);
__ ldrw(keylen, Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)));
__ ld1(v0, __ T16B, rvec);
__ cmpw(keylen, 52);
__ br(Assembler::CC, L_loadkeys_44);
__ br(Assembler::EQ, L_loadkeys_52);
__ ld1(v17, v18, __ T16B, __ post(key, 32));
__ rev32(v17, __ T16B, v17);
__ rev32(v18, __ T16B, v18);
__ BIND(L_loadkeys_52);
__ ld1(v19, v20, __ T16B, __ post(key, 32));
__ rev32(v19, __ T16B, v19);
__ rev32(v20, __ T16B, v20);
__ BIND(L_loadkeys_44);
__ ld1(v21, v22, v23, v24, __ T16B, __ post(key, 64));
__ rev32(v21, __ T16B, v21);
__ rev32(v22, __ T16B, v22);
__ rev32(v23, __ T16B, v23);
__ rev32(v24, __ T16B, v24);
__ ld1(v25, v26, v27, v28, __ T16B, __ post(key, 64));
__ rev32(v25, __ T16B, v25);
__ rev32(v26, __ T16B, v26);
__ rev32(v27, __ T16B, v27);
__ rev32(v28, __ T16B, v28);
__ ld1(v29, v30, v31, __ T16B, key);
__ rev32(v29, __ T16B, v29);
__ rev32(v30, __ T16B, v30);
__ rev32(v31, __ T16B, v31);
__ BIND(L_aes_loop);
__ ld1(v1, __ T16B, __ post(from, 16));
__ eor(v0, __ T16B, v0, v1);
__ br(Assembler::CC, L_rounds_44);
__ br(Assembler::EQ, L_rounds_52);
__ aese(v0, v17); __ aesmc(v0, v0);
__ aese(v0, v18); __ aesmc(v0, v0);
__ BIND(L_rounds_52);
__ aese(v0, v19); __ aesmc(v0, v0);
__ aese(v0, v20); __ aesmc(v0, v0);
__ BIND(L_rounds_44);
__ aese(v0, v21); __ aesmc(v0, v0);
__ aese(v0, v22); __ aesmc(v0, v0);
__ aese(v0, v23); __ aesmc(v0, v0);
__ aese(v0, v24); __ aesmc(v0, v0);
__ aese(v0, v25); __ aesmc(v0, v0);
__ aese(v0, v26); __ aesmc(v0, v0);
__ aese(v0, v27); __ aesmc(v0, v0);
__ aese(v0, v28); __ aesmc(v0, v0);
__ aese(v0, v29); __ aesmc(v0, v0);
__ aese(v0, v30);
__ eor(v0, __ T16B, v0, v31);
__ st1(v0, __ T16B, __ post(to, 16));
__ subw(len_reg, len_reg, 16);
__ cbnzw(len_reg, L_aes_loop);
__ st1(v0, __ T16B, rvec);
__ mov(r0, rscratch2);
__ leave();
__ ret(lr);
return start;
}
// Arguments:
//
// Inputs:
// c_rarg0 - source byte array address
// c_rarg1 - destination byte array address
// c_rarg2 - K (key) in little endian int array
// c_rarg3 - r vector byte array address
// c_rarg4 - input length
//
// Output:
// r0 - input length
//
address generate_cipherBlockChaining_decryptAESCrypt() {
assert(UseAES, "need AES instructions and misaligned SSE support");
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "cipherBlockChaining_decryptAESCrypt");
Label L_loadkeys_44, L_loadkeys_52, L_aes_loop, L_rounds_44, L_rounds_52;
const Register from = c_rarg0; // source array address
const Register to = c_rarg1; // destination array address
const Register key = c_rarg2; // key array address
const Register rvec = c_rarg3; // r byte array initialized from initvector array address
// and left with the results of the last encryption block
const Register len_reg = c_rarg4; // src len (must be multiple of blocksize 16)
const Register keylen = rscratch1;
address start = __ pc();
__ enter();
__ movw(rscratch2, len_reg);
__ ldrw(keylen, Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)));
__ ld1(v2, __ T16B, rvec);
__ ld1(v31, __ T16B, __ post(key, 16));
__ rev32(v31, __ T16B, v31);
__ cmpw(keylen, 52);
__ br(Assembler::CC, L_loadkeys_44);
__ br(Assembler::EQ, L_loadkeys_52);
__ ld1(v17, v18, __ T16B, __ post(key, 32));
__ rev32(v17, __ T16B, v17);
__ rev32(v18, __ T16B, v18);
__ BIND(L_loadkeys_52);
__ ld1(v19, v20, __ T16B, __ post(key, 32));
__ rev32(v19, __ T16B, v19);
__ rev32(v20, __ T16B, v20);
__ BIND(L_loadkeys_44);
__ ld1(v21, v22, v23, v24, __ T16B, __ post(key, 64));
__ rev32(v21, __ T16B, v21);
__ rev32(v22, __ T16B, v22);
__ rev32(v23, __ T16B, v23);
__ rev32(v24, __ T16B, v24);
__ ld1(v25, v26, v27, v28, __ T16B, __ post(key, 64));
__ rev32(v25, __ T16B, v25);
__ rev32(v26, __ T16B, v26);
__ rev32(v27, __ T16B, v27);
__ rev32(v28, __ T16B, v28);
__ ld1(v29, v30, __ T16B, key);
__ rev32(v29, __ T16B, v29);
__ rev32(v30, __ T16B, v30);
__ BIND(L_aes_loop);
__ ld1(v0, __ T16B, __ post(from, 16));
__ orr(v1, __ T16B, v0, v0);
__ br(Assembler::CC, L_rounds_44);
__ br(Assembler::EQ, L_rounds_52);
__ aesd(v0, v17); __ aesimc(v0, v0);
__ aesd(v0, v18); __ aesimc(v0, v0);
__ BIND(L_rounds_52);
__ aesd(v0, v19); __ aesimc(v0, v0);
__ aesd(v0, v20); __ aesimc(v0, v0);
__ BIND(L_rounds_44);
__ aesd(v0, v21); __ aesimc(v0, v0);
__ aesd(v0, v22); __ aesimc(v0, v0);
__ aesd(v0, v23); __ aesimc(v0, v0);
__ aesd(v0, v24); __ aesimc(v0, v0);
__ aesd(v0, v25); __ aesimc(v0, v0);
__ aesd(v0, v26); __ aesimc(v0, v0);
__ aesd(v0, v27); __ aesimc(v0, v0);
__ aesd(v0, v28); __ aesimc(v0, v0);
__ aesd(v0, v29); __ aesimc(v0, v0);
__ aesd(v0, v30);
__ eor(v0, __ T16B, v0, v31);
__ eor(v0, __ T16B, v0, v2);
__ st1(v0, __ T16B, __ post(to, 16));
__ orr(v2, __ T16B, v1, v1);
__ subw(len_reg, len_reg, 16);
__ cbnzw(len_reg, L_aes_loop);
__ st1(v2, __ T16B, rvec);
__ mov(r0, rscratch2);
__ leave();
__ ret(lr);
return start;
}
// Arguments:
//
// Inputs:
// c_rarg0 - byte[] source+offset
// c_rarg1 - int[] SHA.state
// c_rarg2 - int offset
// c_rarg3 - int limit
//
address generate_sha1_implCompress(bool multi_block, const char *name) {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
Register buf = c_rarg0;
Register state = c_rarg1;
Register ofs = c_rarg2;
Register limit = c_rarg3;
Label keys;
Label sha1_loop;
// load the keys into v0..v3
__ adr(rscratch1, keys);
__ ld4r(v0, v1, v2, v3, __ T4S, Address(rscratch1));
// load 5 words state into v6, v7
__ ldrq(v6, Address(state, 0));
__ ldrs(v7, Address(state, 16));
__ BIND(sha1_loop);
// load 64 bytes of data into v16..v19
__ ld1(v16, v17, v18, v19, __ T4S, multi_block ? __ post(buf, 64) : buf);
__ rev32(v16, __ T16B, v16);
__ rev32(v17, __ T16B, v17);
__ rev32(v18, __ T16B, v18);
__ rev32(v19, __ T16B, v19);
// do the sha1
__ addv(v4, __ T4S, v16, v0);
__ orr(v20, __ T16B, v6, v6);
FloatRegister d0 = v16;
FloatRegister d1 = v17;
FloatRegister d2 = v18;
FloatRegister d3 = v19;
for (int round = 0; round < 20; round++) {
FloatRegister tmp1 = (round & 1) ? v4 : v5;
FloatRegister tmp2 = (round & 1) ? v21 : v22;
FloatRegister tmp3 = round ? ((round & 1) ? v22 : v21) : v7;
FloatRegister tmp4 = (round & 1) ? v5 : v4;
FloatRegister key = (round < 4) ? v0 : ((round < 9) ? v1 : ((round < 14) ? v2 : v3));
if (round < 16) __ sha1su0(d0, __ T4S, d1, d2);
if (round < 19) __ addv(tmp1, __ T4S, d1, key);
__ sha1h(tmp2, __ T4S, v20);
if (round < 5)
__ sha1c(v20, __ T4S, tmp3, tmp4);
else if (round < 10 || round >= 15)
__ sha1p(v20, __ T4S, tmp3, tmp4);
else
__ sha1m(v20, __ T4S, tmp3, tmp4);
if (round < 16) __ sha1su1(d0, __ T4S, d3);
tmp1 = d0; d0 = d1; d1 = d2; d2 = d3; d3 = tmp1;
}
__ addv(v7, __ T2S, v7, v21);
__ addv(v6, __ T4S, v6, v20);
if (multi_block) {
__ add(ofs, ofs, 64);
__ cmp(ofs, limit);
__ br(Assembler::LE, sha1_loop);
__ mov(c_rarg0, ofs); // return ofs
}
__ strq(v6, Address(state, 0));
__ strs(v7, Address(state, 16));
__ ret(lr);
__ bind(keys);
__ emit_int32(0x5a827999);
__ emit_int32(0x6ed9eba1);
__ emit_int32(0x8f1bbcdc);
__ emit_int32(0xca62c1d6);
return start;
}
// Arguments:
//
// Inputs:
// c_rarg0 - byte[] source+offset
// c_rarg1 - int[] SHA.state
// c_rarg2 - int offset
// c_rarg3 - int limit
//
address generate_sha256_implCompress(bool multi_block, const char *name) {
static const uint32_t round_consts[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
};
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", name);
address start = __ pc();
Register buf = c_rarg0;
Register state = c_rarg1;
Register ofs = c_rarg2;
Register limit = c_rarg3;
Label sha1_loop;
__ stpd(v8, v9, __ pre(sp, -32));
__ stpd(v10, v11, Address(sp, 16));
// dga == v0
// dgb == v1
// dg0 == v2
// dg1 == v3
// dg2 == v4
// t0 == v6
// t1 == v7
// load 16 keys to v16..v31
__ lea(rscratch1, ExternalAddress((address)round_consts));
__ ld1(v16, v17, v18, v19, __ T4S, __ post(rscratch1, 64));
__ ld1(v20, v21, v22, v23, __ T4S, __ post(rscratch1, 64));
__ ld1(v24, v25, v26, v27, __ T4S, __ post(rscratch1, 64));
__ ld1(v28, v29, v30, v31, __ T4S, rscratch1);
// load 8 words (256 bits) state
__ ldpq(v0, v1, state);
__ BIND(sha1_loop);
// load 64 bytes of data into v8..v11
__ ld1(v8, v9, v10, v11, __ T4S, multi_block ? __ post(buf, 64) : buf);
__ rev32(v8, __ T16B, v8);
__ rev32(v9, __ T16B, v9);
__ rev32(v10, __ T16B, v10);
__ rev32(v11, __ T16B, v11);
__ addv(v6, __ T4S, v8, v16);
__ orr(v2, __ T16B, v0, v0);
__ orr(v3, __ T16B, v1, v1);
FloatRegister d0 = v8;
FloatRegister d1 = v9;
FloatRegister d2 = v10;
FloatRegister d3 = v11;
for (int round = 0; round < 16; round++) {
FloatRegister tmp1 = (round & 1) ? v6 : v7;
FloatRegister tmp2 = (round & 1) ? v7 : v6;
FloatRegister tmp3 = (round & 1) ? v2 : v4;
FloatRegister tmp4 = (round & 1) ? v4 : v2;
if (round < 12) __ sha256su0(d0, __ T4S, d1);
__ orr(v4, __ T16B, v2, v2);
if (round < 15)
__ addv(tmp1, __ T4S, d1, as_FloatRegister(round + 17));
__ sha256h(v2, __ T4S, v3, tmp2);
__ sha256h2(v3, __ T4S, v4, tmp2);
if (round < 12) __ sha256su1(d0, __ T4S, d2, d3);
tmp1 = d0; d0 = d1; d1 = d2; d2 = d3; d3 = tmp1;
}
__ addv(v0, __ T4S, v0, v2);
__ addv(v1, __ T4S, v1, v3);
if (multi_block) {
__ add(ofs, ofs, 64);
__ cmp(ofs, limit);
__ br(Assembler::LE, sha1_loop);
__ mov(c_rarg0, ofs); // return ofs
}
__ ldpd(v10, v11, Address(sp, 16));
__ ldpd(v8, v9, __ post(sp, 32));
__ stpq(v0, v1, state);
__ ret(lr);
return start;
}
// Safefetch stubs.
void generate_safefetch(const char* name, int size, address* entry,
address* fault_pc, address* continuation_pc) {
// safefetch signatures:
// int SafeFetch32(int* adr, int errValue);
// intptr_t SafeFetchN (intptr_t* adr, intptr_t errValue);
//
// arguments:
// c_rarg0 = adr
// c_rarg1 = errValue
//
// result:
// PPC_RET = *adr or errValue
StubCodeMark mark(this, "StubRoutines", name);
// Entry point, pc or function descriptor.
*entry = __ pc();
// Load *adr into c_rarg1, may fault.
*fault_pc = __ pc();
switch (size) {
case 4:
// int32_t
__ ldrw(c_rarg1, Address(c_rarg0, 0));
break;
case 8:
// int64_t
__ ldr(c_rarg1, Address(c_rarg0, 0));
break;
default:
ShouldNotReachHere();
}
// return errValue or *adr
*continuation_pc = __ pc();
__ mov(r0, c_rarg1);
__ ret(lr);
}
/**
* Arguments:
*
* Inputs:
* c_rarg0 - int crc
* c_rarg1 - byte* buf
* c_rarg2 - int length
*
* Ouput:
* rax - int crc result
*/
address generate_updateBytesCRC32() {
assert(UseCRC32Intrinsics, "what are we doing here?");
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "updateBytesCRC32");
address start = __ pc();
const Register crc = c_rarg0; // crc
const Register buf = c_rarg1; // source java byte array address
const Register len = c_rarg2; // length
const Register table0 = c_rarg3; // crc_table address
const Register table1 = c_rarg4;
const Register table2 = c_rarg5;
const Register table3 = c_rarg6;
const Register tmp3 = c_rarg7;
BLOCK_COMMENT("Entry:");
__ enter(); // required for proper stackwalking of RuntimeStub frame
__ kernel_crc32(crc, buf, len,
table0, table1, table2, table3, rscratch1, rscratch2, tmp3);
__ leave(); // required for proper stackwalking of RuntimeStub frame
__ ret(lr);
return start;
}
/**
* Arguments:
*
* Inputs:
* c_rarg0 - int crc
* c_rarg1 - byte* buf
* c_rarg2 - int length
* c_rarg3 - int* table
*
* Ouput:
* r0 - int crc result
*/
address generate_updateBytesCRC32C() {
assert(UseCRC32CIntrinsics, "what are we doing here?");
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "updateBytesCRC32C");
address start = __ pc();
const Register crc = c_rarg0; // crc
const Register buf = c_rarg1; // source java byte array address
const Register len = c_rarg2; // length
const Register table0 = c_rarg3; // crc_table address
const Register table1 = c_rarg4;
const Register table2 = c_rarg5;
const Register table3 = c_rarg6;
const Register tmp3 = c_rarg7;
BLOCK_COMMENT("Entry:");
__ enter(); // required for proper stackwalking of RuntimeStub frame
__ kernel_crc32c(crc, buf, len,
table0, table1, table2, table3, rscratch1, rscratch2, tmp3);
__ leave(); // required for proper stackwalking of RuntimeStub frame
__ ret(lr);
return start;
}
/***
* Arguments:
*
* Inputs:
* c_rarg0 - int adler
* c_rarg1 - byte* buff
* c_rarg2 - int len
*
* Output:
* c_rarg0 - int adler result
*/
address generate_updateBytesAdler32() {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "updateBytesAdler32");
address start = __ pc();
Label L_simple_by1_loop, L_nmax, L_nmax_loop, L_by16, L_by16_loop, L_by1_loop, L_do_mod, L_combine, L_by1;
// Aliases
Register adler = c_rarg0;
Register s1 = c_rarg0;
Register s2 = c_rarg3;
Register buff = c_rarg1;
Register len = c_rarg2;
Register nmax = r4;
Register base = r5;
Register count = r6;
Register temp0 = rscratch1;
Register temp1 = rscratch2;
FloatRegister vbytes = v0;
FloatRegister vs1acc = v1;
FloatRegister vs2acc = v2;
FloatRegister vtable = v3;
// Max number of bytes we can process before having to take the mod
// 0x15B0 is 5552 in decimal, the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1
unsigned long BASE = 0xfff1;
unsigned long NMAX = 0x15B0;
__ mov(base, BASE);
__ mov(nmax, NMAX);
// Load accumulation coefficients for the upper 16 bits
__ lea(temp0, ExternalAddress((address) StubRoutines::aarch64::_adler_table));
__ ld1(vtable, __ T16B, Address(temp0));
// s1 is initialized to the lower 16 bits of adler
// s2 is initialized to the upper 16 bits of adler
__ ubfx(s2, adler, 16, 16); // s2 = ((adler >> 16) & 0xffff)
__ uxth(s1, adler); // s1 = (adler & 0xffff)
// The pipelined loop needs at least 16 elements for 1 iteration
// It does check this, but it is more effective to skip to the cleanup loop
__ cmp(len, (u1)16);
__ br(Assembler::HS, L_nmax);
__ cbz(len, L_combine);
__ bind(L_simple_by1_loop);
__ ldrb(temp0, Address(__ post(buff, 1)));
__ add(s1, s1, temp0);
__ add(s2, s2, s1);
__ subs(len, len, 1);
__ br(Assembler::HI, L_simple_by1_loop);
// s1 = s1 % BASE
__ subs(temp0, s1, base);
__ csel(s1, temp0, s1, Assembler::HS);
// s2 = s2 % BASE
__ lsr(temp0, s2, 16);
__ lsl(temp1, temp0, 4);
__ sub(temp1, temp1, temp0);
__ add(s2, temp1, s2, ext::uxth);
__ subs(temp0, s2, base);
__ csel(s2, temp0, s2, Assembler::HS);
__ b(L_combine);
__ bind(L_nmax);
__ subs(len, len, nmax);
__ sub(count, nmax, 16);
__ br(Assembler::LO, L_by16);
__ bind(L_nmax_loop);
generate_updateBytesAdler32_accum(s1, s2, buff, temp0, temp1,
vbytes, vs1acc, vs2acc, vtable);
__ subs(count, count, 16);
__ br(Assembler::HS, L_nmax_loop);
// s1 = s1 % BASE
__ lsr(temp0, s1, 16);
__ lsl(temp1, temp0, 4);
__ sub(temp1, temp1, temp0);
__ add(temp1, temp1, s1, ext::uxth);
__ lsr(temp0, temp1, 16);
__ lsl(s1, temp0, 4);
__ sub(s1, s1, temp0);
__ add(s1, s1, temp1, ext:: uxth);
__ subs(temp0, s1, base);
__ csel(s1, temp0, s1, Assembler::HS);
// s2 = s2 % BASE
__ lsr(temp0, s2, 16);
__ lsl(temp1, temp0, 4);
__ sub(temp1, temp1, temp0);
__ add(temp1, temp1, s2, ext::uxth);
__ lsr(temp0, temp1, 16);
__ lsl(s2, temp0, 4);
__ sub(s2, s2, temp0);
__ add(s2, s2, temp1, ext:: uxth);
__ subs(temp0, s2, base);
__ csel(s2, temp0, s2, Assembler::HS);
__ subs(len, len, nmax);
__ sub(count, nmax, 16);
__ br(Assembler::HS, L_nmax_loop);
__ bind(L_by16);
__ adds(len, len, count);
__ br(Assembler::LO, L_by1);
__ bind(L_by16_loop);
generate_updateBytesAdler32_accum(s1, s2, buff, temp0, temp1,
vbytes, vs1acc, vs2acc, vtable);
__ subs(len, len, 16);
__ br(Assembler::HS, L_by16_loop);
__ bind(L_by1);
__ adds(len, len, 15);
__ br(Assembler::LO, L_do_mod);
__ bind(L_by1_loop);
__ ldrb(temp0, Address(__ post(buff, 1)));
__ add(s1, temp0, s1);
__ add(s2, s2, s1);
__ subs(len, len, 1);
__ br(Assembler::HS, L_by1_loop);
__ bind(L_do_mod);
// s1 = s1 % BASE
__ lsr(temp0, s1, 16);
__ lsl(temp1, temp0, 4);
__ sub(temp1, temp1, temp0);
__ add(temp1, temp1, s1, ext::uxth);
__ lsr(temp0, temp1, 16);
__ lsl(s1, temp0, 4);
__ sub(s1, s1, temp0);
__ add(s1, s1, temp1, ext:: uxth);
__ subs(temp0, s1, base);
__ csel(s1, temp0, s1, Assembler::HS);
// s2 = s2 % BASE
__ lsr(temp0, s2, 16);
__ lsl(temp1, temp0, 4);
__ sub(temp1, temp1, temp0);
__ add(temp1, temp1, s2, ext::uxth);
__ lsr(temp0, temp1, 16);
__ lsl(s2, temp0, 4);
__ sub(s2, s2, temp0);
__ add(s2, s2, temp1, ext:: uxth);
__ subs(temp0, s2, base);
__ csel(s2, temp0, s2, Assembler::HS);
// Combine lower bits and higher bits
__ bind(L_combine);
__ orr(s1, s1, s2, Assembler::LSL, 16); // adler = s1 | (s2 << 16)
__ ret(lr);
return start;
}
void generate_updateBytesAdler32_accum(Register s1, Register s2, Register buff,
Register temp0, Register temp1, FloatRegister vbytes,
FloatRegister vs1acc, FloatRegister vs2acc, FloatRegister vtable) {
// Below is a vectorized implementation of updating s1 and s2 for 16 bytes.
// We use b1, b2, ..., b16 to denote the 16 bytes loaded in each iteration.
// In non-vectorized code, we update s1 and s2 as:
// s1 <- s1 + b1
// s2 <- s2 + s1
// s1 <- s1 + b2
// s2 <- s2 + b1
// ...
// s1 <- s1 + b16
// s2 <- s2 + s1
// Putting above assignments together, we have:
// s1_new = s1 + b1 + b2 + ... + b16
// s2_new = s2 + (s1 + b1) + (s1 + b1 + b2) + ... + (s1 + b1 + b2 + ... + b16)
// = s2 + s1 * 16 + (b1 * 16 + b2 * 15 + ... + b16 * 1)
// = s2 + s1 * 16 + (b1, b2, ... b16) dot (16, 15, ... 1)
__ ld1(vbytes, __ T16B, Address(__ post(buff, 16)));
// s2 = s2 + s1 * 16
__ add(s2, s2, s1, Assembler::LSL, 4);
// vs1acc = b1 + b2 + b3 + ... + b16
// vs2acc = (b1 * 16) + (b2 * 15) + (b3 * 14) + ... + (b16 * 1)
__ umullv(vs2acc, __ T8B, vtable, vbytes);
__ umlalv(vs2acc, __ T16B, vtable, vbytes);
__ uaddlv(vs1acc, __ T16B, vbytes);
__ uaddlv(vs2acc, __ T8H, vs2acc);
// s1 = s1 + vs1acc, s2 = s2 + vs2acc
__ fmovd(temp0, vs1acc);
__ fmovd(temp1, vs2acc);
__ add(s1, s1, temp0);
__ add(s2, s2, temp1);
}
/**
* Arguments:
*
* Input:
* c_rarg0 - x address
* c_rarg1 - x length
* c_rarg2 - y address
* c_rarg3 - y lenth
* c_rarg4 - z address
* c_rarg5 - z length
*/
address generate_multiplyToLen() {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "multiplyToLen");
address start = __ pc();
const Register x = r0;
const Register xlen = r1;
const Register y = r2;
const Register ylen = r3;
const Register z = r4;
const Register zlen = r5;
const Register tmp1 = r10;
const Register tmp2 = r11;
const Register tmp3 = r12;
const Register tmp4 = r13;
const Register tmp5 = r14;
const Register tmp6 = r15;
const Register tmp7 = r16;
BLOCK_COMMENT("Entry:");
__ enter(); // required for proper stackwalking of RuntimeStub frame
__ multiply_to_len(x, xlen, y, ylen, z, zlen, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7);
__ leave(); // required for proper stackwalking of RuntimeStub frame
__ ret(lr);
return start;
}
address generate_squareToLen() {
// squareToLen algorithm for sizes 1..127 described in java code works
// faster than multiply_to_len on some CPUs and slower on others, but
// multiply_to_len shows a bit better overall results
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "squareToLen");
address start = __ pc();
const Register x = r0;
const Register xlen = r1;
const Register z = r2;
const Register zlen = r3;
const Register y = r4; // == x
const Register ylen = r5; // == xlen
const Register tmp1 = r10;
const Register tmp2 = r11;
const Register tmp3 = r12;
const Register tmp4 = r13;
const Register tmp5 = r14;
const Register tmp6 = r15;
const Register tmp7 = r16;
RegSet spilled_regs = RegSet::of(y, ylen);
BLOCK_COMMENT("Entry:");
__ enter();
__ push(spilled_regs, sp);
__ mov(y, x);
__ mov(ylen, xlen);
__ multiply_to_len(x, xlen, y, ylen, z, zlen, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7);
__ pop(spilled_regs, sp);
__ leave();
__ ret(lr);
return start;
}
address generate_mulAdd() {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "mulAdd");
address start = __ pc();
const Register out = r0;
const Register in = r1;
const Register offset = r2;
const Register len = r3;
const Register k = r4;
BLOCK_COMMENT("Entry:");
__ enter();
__ mul_add(out, in, offset, len, k);
__ leave();
__ ret(lr);
return start;
}
void ghash_multiply(FloatRegister result_lo, FloatRegister result_hi,
FloatRegister a, FloatRegister b, FloatRegister a1_xor_a0,
FloatRegister tmp1, FloatRegister tmp2, FloatRegister tmp3, FloatRegister tmp4) {
// Karatsuba multiplication performs a 128*128 -> 256-bit
// multiplication in three 128-bit multiplications and a few
// additions.
//
// (C1:C0) = A1*B1, (D1:D0) = A0*B0, (E1:E0) = (A0+A1)(B0+B1)
// (A1:A0)(B1:B0) = C1:(C0+C1+D1+E1):(D1+C0+D0+E0):D0
//
// Inputs:
//
// A0 in a.d[0] (subkey)
// A1 in a.d[1]
// (A1+A0) in a1_xor_a0.d[0]
//
// B0 in b.d[0] (state)
// B1 in b.d[1]
__ ext(tmp1, __ T16B, b, b, 0x08);
__ pmull2(result_hi, __ T1Q, b, a, __ T2D); // A1*B1
__ eor(tmp1, __ T16B, tmp1, b); // (B1+B0)
__ pmull(result_lo, __ T1Q, b, a, __ T1D); // A0*B0
__ pmull(tmp2, __ T1Q, tmp1, a1_xor_a0, __ T1D); // (A1+A0)(B1+B0)
__ ext(tmp4, __ T16B, result_lo, result_hi, 0x08);
__ eor(tmp3, __ T16B, result_hi, result_lo); // A1*B1+A0*B0
__ eor(tmp2, __ T16B, tmp2, tmp4);
__ eor(tmp2, __ T16B, tmp2, tmp3);
// Register pair <result_hi:result_lo> holds the result of carry-less multiplication
__ ins(result_hi, __ D, tmp2, 0, 1);
__ ins(result_lo, __ D, tmp2, 1, 0);
}
void ghash_reduce(FloatRegister result, FloatRegister lo, FloatRegister hi,
FloatRegister p, FloatRegister z, FloatRegister t1) {
const FloatRegister t0 = result;
// The GCM field polynomial f is z^128 + p(z), where p =
// z^7+z^2+z+1.
//
// z^128 === -p(z) (mod (z^128 + p(z)))
//
// so, given that the product we're reducing is
// a == lo + hi * z^128
// substituting,
// === lo - hi * p(z) (mod (z^128 + p(z)))
//
// we reduce by multiplying hi by p(z) and subtracting the result
// from (i.e. XORing it with) lo. Because p has no nonzero high
// bits we can do this with two 64-bit multiplications, lo*p and
// hi*p.
__ pmull2(t0, __ T1Q, hi, p, __ T2D);
__ ext(t1, __ T16B, t0, z, 8);
__ eor(hi, __ T16B, hi, t1);
__ ext(t1, __ T16B, z, t0, 8);
__ eor(lo, __ T16B, lo, t1);
__ pmull(t0, __ T1Q, hi, p, __ T1D);
__ eor(result, __ T16B, lo, t0);
}
address generate_has_negatives(address &has_negatives_long) {
const u1 large_loop_size = 64;
const uint64_t UPPER_BIT_MASK=0x8080808080808080;
int dcache_line = VM_Version::dcache_line_size();
Register ary1 = r1, len = r2, result = r0;
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "has_negatives");
address entry = __ pc();
__ enter();
Label RET_TRUE, RET_TRUE_NO_POP, RET_FALSE, ALIGNED, LOOP16, CHECK_16, DONE,
LARGE_LOOP, POST_LOOP16, LEN_OVER_15, LEN_OVER_8, POST_LOOP16_LOAD_TAIL;
__ cmp(len, (u1)15);
__ br(Assembler::GT, LEN_OVER_15);
// The only case when execution falls into this code is when pointer is near
// the end of memory page and we have to avoid reading next page
__ add(ary1, ary1, len);
__ subs(len, len, 8);
__ br(Assembler::GT, LEN_OVER_8);
__ ldr(rscratch2, Address(ary1, -8));
__ sub(rscratch1, zr, len, __ LSL, 3); // LSL 3 is to get bits from bytes.
__ lsrv(rscratch2, rscratch2, rscratch1);
__ tst(rscratch2, UPPER_BIT_MASK);
__ cset(result, Assembler::NE);
__ leave();
__ ret(lr);
__ bind(LEN_OVER_8);
__ ldp(rscratch1, rscratch2, Address(ary1, -16));
__ sub(len, len, 8); // no data dep., then sub can be executed while loading
__ tst(rscratch2, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE_NO_POP);
__ sub(rscratch2, zr, len, __ LSL, 3); // LSL 3 is to get bits from bytes
__ lsrv(rscratch1, rscratch1, rscratch2);
__ tst(rscratch1, UPPER_BIT_MASK);
__ cset(result, Assembler::NE);
__ leave();
__ ret(lr);
Register tmp1 = r3, tmp2 = r4, tmp3 = r5, tmp4 = r6, tmp5 = r7, tmp6 = r10;
const RegSet spilled_regs = RegSet::range(tmp1, tmp5) + tmp6;
has_negatives_long = __ pc(); // 2nd entry point
__ enter();
__ bind(LEN_OVER_15);
__ push(spilled_regs, sp);
__ andr(rscratch2, ary1, 15); // check pointer for 16-byte alignment
__ cbz(rscratch2, ALIGNED);
__ ldp(tmp6, tmp1, Address(ary1));
__ mov(tmp5, 16);
__ sub(rscratch1, tmp5, rscratch2); // amount of bytes until aligned address
__ add(ary1, ary1, rscratch1);
__ sub(len, len, rscratch1);
__ orr(tmp6, tmp6, tmp1);
__ tst(tmp6, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE);
__ bind(ALIGNED);
__ cmp(len, large_loop_size);
__ br(Assembler::LT, CHECK_16);
// Perform 16-byte load as early return in pre-loop to handle situation
// when initially aligned large array has negative values at starting bytes,
// so LARGE_LOOP would do 4 reads instead of 1 (in worst case), which is
// slower. Cases with negative bytes further ahead won't be affected that
// much. In fact, it'll be faster due to early loads, less instructions and
// less branches in LARGE_LOOP.
__ ldp(tmp6, tmp1, Address(__ post(ary1, 16)));
__ sub(len, len, 16);
__ orr(tmp6, tmp6, tmp1);
__ tst(tmp6, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE);
__ cmp(len, large_loop_size);
__ br(Assembler::LT, CHECK_16);
if (SoftwarePrefetchHintDistance >= 0
&& SoftwarePrefetchHintDistance >= dcache_line) {
// initial prefetch
__ prfm(Address(ary1, SoftwarePrefetchHintDistance - dcache_line));
}
__ bind(LARGE_LOOP);
if (SoftwarePrefetchHintDistance >= 0) {
__ prfm(Address(ary1, SoftwarePrefetchHintDistance));
}
// Issue load instructions first, since it can save few CPU/MEM cycles, also
// instead of 4 triples of "orr(...), addr(...);cbnz(...);" (for each ldp)
// better generate 7 * orr(...) + 1 andr(...) + 1 cbnz(...) which saves 3
// instructions per cycle and have less branches, but this approach disables
// early return, thus, all 64 bytes are loaded and checked every time.
__ ldp(tmp2, tmp3, Address(ary1));
__ ldp(tmp4, tmp5, Address(ary1, 16));
__ ldp(rscratch1, rscratch2, Address(ary1, 32));
__ ldp(tmp6, tmp1, Address(ary1, 48));
__ add(ary1, ary1, large_loop_size);
__ sub(len, len, large_loop_size);
__ orr(tmp2, tmp2, tmp3);
__ orr(tmp4, tmp4, tmp5);
__ orr(rscratch1, rscratch1, rscratch2);
__ orr(tmp6, tmp6, tmp1);
__ orr(tmp2, tmp2, tmp4);
__ orr(rscratch1, rscratch1, tmp6);
__ orr(tmp2, tmp2, rscratch1);
__ tst(tmp2, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE);
__ cmp(len, large_loop_size);
__ br(Assembler::GE, LARGE_LOOP);
__ bind(CHECK_16); // small 16-byte load pre-loop
__ cmp(len, (u1)16);
__ br(Assembler::LT, POST_LOOP16);
__ bind(LOOP16); // small 16-byte load loop
__ ldp(tmp2, tmp3, Address(__ post(ary1, 16)));
__ sub(len, len, 16);
__ orr(tmp2, tmp2, tmp3);
__ tst(tmp2, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE);
__ cmp(len, (u1)16);
__ br(Assembler::GE, LOOP16); // 16-byte load loop end
__ bind(POST_LOOP16); // 16-byte aligned, so we can read unconditionally
__ cmp(len, (u1)8);
__ br(Assembler::LE, POST_LOOP16_LOAD_TAIL);
__ ldr(tmp3, Address(__ post(ary1, 8)));
__ sub(len, len, 8);
__ tst(tmp3, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE);
__ bind(POST_LOOP16_LOAD_TAIL);
__ cbz(len, RET_FALSE); // Can't shift left by 64 when len==0
__ ldr(tmp1, Address(ary1));
__ mov(tmp2, 64);
__ sub(tmp4, tmp2, len, __ LSL, 3);
__ lslv(tmp1, tmp1, tmp4);
__ tst(tmp1, UPPER_BIT_MASK);
__ br(Assembler::NE, RET_TRUE);
// Fallthrough
__ bind(RET_FALSE);
__ pop(spilled_regs, sp);
__ leave();
__ mov(result, zr);
__ ret(lr);
__ bind(RET_TRUE);
__ pop(spilled_regs, sp);
__ bind(RET_TRUE_NO_POP);
__ leave();
__ mov(result, 1);
__ ret(lr);
__ bind(DONE);
__ pop(spilled_regs, sp);
__ leave();
__ ret(lr);
return entry;
}
void generate_large_array_equals_loop_nonsimd(int loopThreshold,
bool usePrefetch, Label &NOT_EQUAL) {
Register a1 = r1, a2 = r2, result = r0, cnt1 = r10, tmp1 = rscratch1,
tmp2 = rscratch2, tmp3 = r3, tmp4 = r4, tmp5 = r5, tmp6 = r11,
tmp7 = r12, tmp8 = r13;
Label LOOP;
__ ldp(tmp1, tmp3, Address(__ post(a1, 2 * wordSize)));
__ ldp(tmp2, tmp4, Address(__ post(a2, 2 * wordSize)));
__ bind(LOOP);
if (usePrefetch) {
__ prfm(Address(a1, SoftwarePrefetchHintDistance));
__ prfm(Address(a2, SoftwarePrefetchHintDistance));
}
__ ldp(tmp5, tmp7, Address(__ post(a1, 2 * wordSize)));
__ eor(tmp1, tmp1, tmp2);
__ eor(tmp3, tmp3, tmp4);
__ ldp(tmp6, tmp8, Address(__ post(a2, 2 * wordSize)));
__ orr(tmp1, tmp1, tmp3);
__ cbnz(tmp1, NOT_EQUAL);
__ ldp(tmp1, tmp3, Address(__ post(a1, 2 * wordSize)));
__ eor(tmp5, tmp5, tmp6);
__ eor(tmp7, tmp7, tmp8);
__ ldp(tmp2, tmp4, Address(__ post(a2, 2 * wordSize)));
__ orr(tmp5, tmp5, tmp7);
__ cbnz(tmp5, NOT_EQUAL);
__ ldp(tmp5, tmp7, Address(__ post(a1, 2 * wordSize)));
__ eor(tmp1, tmp1, tmp2);
__ eor(tmp3, tmp3, tmp4);
__ ldp(tmp6, tmp8, Address(__ post(a2, 2 * wordSize)));
__ orr(tmp1, tmp1, tmp3);
__ cbnz(tmp1, NOT_EQUAL);
__ ldp(tmp1, tmp3, Address(__ post(a1, 2 * wordSize)));
__ eor(tmp5, tmp5, tmp6);
__ sub(cnt1, cnt1, 8 * wordSize);
__ eor(tmp7, tmp7, tmp8);
__ ldp(tmp2, tmp4, Address(__ post(a2, 2 * wordSize)));
// tmp6 is not used. MacroAssembler::subs is used here (rather than
// cmp) because subs allows an unlimited range of immediate operand.
__ subs(tmp6, cnt1, loopThreshold);
__ orr(tmp5, tmp5, tmp7);
__ cbnz(tmp5, NOT_EQUAL);
__ br(__ GE, LOOP);
// post-loop
__ eor(tmp1, tmp1, tmp2);
__ eor(tmp3, tmp3, tmp4);
__ orr(tmp1, tmp1, tmp3);
__ sub(cnt1, cnt1, 2 * wordSize);
__ cbnz(tmp1, NOT_EQUAL);
}
void generate_large_array_equals_loop_simd(int loopThreshold,
bool usePrefetch, Label &NOT_EQUAL) {
Register a1 = r1, a2 = r2, result = r0, cnt1 = r10, tmp1 = rscratch1,
tmp2 = rscratch2;
Label LOOP;
__ bind(LOOP);
if (usePrefetch) {
__ prfm(Address(a1, SoftwarePrefetchHintDistance));
__ prfm(Address(a2, SoftwarePrefetchHintDistance));
}
__ ld1(v0, v1, v2, v3, __ T2D, Address(__ post(a1, 4 * 2 * wordSize)));
__ sub(cnt1, cnt1, 8 * wordSize);
__ ld1(v4, v5, v6, v7, __ T2D, Address(__ post(a2, 4 * 2 * wordSize)));
__ subs(tmp1, cnt1, loopThreshold);
__ eor(v0, __ T16B, v0, v4);
__ eor(v1, __ T16B, v1, v5);
__ eor(v2, __ T16B, v2, v6);
__ eor(v3, __ T16B, v3, v7);
__ orr(v0, __ T16B, v0, v1);
__ orr(v1, __ T16B, v2, v3);
__ orr(v0, __ T16B, v0, v1);
__ umov(tmp1, v0, __ D, 0);
__ umov(tmp2, v0, __ D, 1);
__ orr(tmp1, tmp1, tmp2);
__ cbnz(tmp1, NOT_EQUAL);
__ br(__ GE, LOOP);
}
// a1 = r1 - array1 address
// a2 = r2 - array2 address
// result = r0 - return value. Already contains "false"
// cnt1 = r10 - amount of elements left to check, reduced by wordSize
// r3-r5 are reserved temporary registers
address generate_large_array_equals() {
Register a1 = r1, a2 = r2, result = r0, cnt1 = r10, tmp1 = rscratch1,
tmp2 = rscratch2, tmp3 = r3, tmp4 = r4, tmp5 = r5, tmp6 = r11,
tmp7 = r12, tmp8 = r13;
Label TAIL, NOT_EQUAL, EQUAL, NOT_EQUAL_NO_POP, NO_PREFETCH_LARGE_LOOP,
SMALL_LOOP, POST_LOOP;
const int PRE_LOOP_SIZE = UseSIMDForArrayEquals ? 0 : 16;
// calculate if at least 32 prefetched bytes are used
int prefetchLoopThreshold = SoftwarePrefetchHintDistance + 32;
int nonPrefetchLoopThreshold = (64 + PRE_LOOP_SIZE);
RegSet spilled_regs = RegSet::range(tmp6, tmp8);
assert_different_registers(a1, a2, result, cnt1, tmp1, tmp2, tmp3, tmp4,
tmp5, tmp6, tmp7, tmp8);
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "large_array_equals");
address entry = __ pc();
__ enter();
__ sub(cnt1, cnt1, wordSize); // first 8 bytes were loaded outside of stub
// also advance pointers to use post-increment instead of pre-increment
__ add(a1, a1, wordSize);
__ add(a2, a2, wordSize);
if (AvoidUnalignedAccesses) {
// both implementations (SIMD/nonSIMD) are using relatively large load
// instructions (ld1/ldp), which has huge penalty (up to x2 exec time)
// on some CPUs in case of address is not at least 16-byte aligned.
// Arrays are 8-byte aligned currently, so, we can make additional 8-byte
// load if needed at least for 1st address and make if 16-byte aligned.
Label ALIGNED16;
__ tbz(a1, 3, ALIGNED16);
__ ldr(tmp1, Address(__ post(a1, wordSize)));
__ ldr(tmp2, Address(__ post(a2, wordSize)));
__ sub(cnt1, cnt1, wordSize);
__ eor(tmp1, tmp1, tmp2);
__ cbnz(tmp1, NOT_EQUAL_NO_POP);
__ bind(ALIGNED16);
}
if (UseSIMDForArrayEquals) {
if (SoftwarePrefetchHintDistance >= 0) {
__ subs(tmp1, cnt1, prefetchLoopThreshold);
__ br(__ LE, NO_PREFETCH_LARGE_LOOP);
generate_large_array_equals_loop_simd(prefetchLoopThreshold,
/* prfm = */ true, NOT_EQUAL);
__ subs(zr, cnt1, nonPrefetchLoopThreshold);
__ br(__ LT, TAIL);
}
__ bind(NO_PREFETCH_LARGE_LOOP);
generate_large_array_equals_loop_simd(nonPrefetchLoopThreshold,
/* prfm = */ false, NOT_EQUAL);
} else {
__ push(spilled_regs, sp);
if (SoftwarePrefetchHintDistance >= 0) {
__ subs(tmp1, cnt1, prefetchLoopThreshold);
__ br(__ LE, NO_PREFETCH_LARGE_LOOP);
generate_large_array_equals_loop_nonsimd(prefetchLoopThreshold,
/* prfm = */ true, NOT_EQUAL);
__ subs(zr, cnt1, nonPrefetchLoopThreshold);
__ br(__ LT, TAIL);
}
__ bind(NO_PREFETCH_LARGE_LOOP);
generate_large_array_equals_loop_nonsimd(nonPrefetchLoopThreshold,
/* prfm = */ false, NOT_EQUAL);
}
__ bind(TAIL);
__ cbz(cnt1, EQUAL);
__ subs(cnt1, cnt1, wordSize);
__ br(__ LE, POST_LOOP);
__ bind(SMALL_LOOP);
__ ldr(tmp1, Address(__ post(a1, wordSize)));
__ ldr(tmp2, Address(__ post(a2, wordSize)));
__ subs(cnt1, cnt1, wordSize);
__ eor(tmp1, tmp1, tmp2);
__ cbnz(tmp1, NOT_EQUAL);
__ br(__ GT, SMALL_LOOP);
__ bind(POST_LOOP);
__ ldr(tmp1, Address(a1, cnt1));
__ ldr(tmp2, Address(a2, cnt1));
__ eor(tmp1, tmp1, tmp2);
__ cbnz(tmp1, NOT_EQUAL);
__ bind(EQUAL);
__ mov(result, true);
__ bind(NOT_EQUAL);
if (!UseSIMDForArrayEquals) {
__ pop(spilled_regs, sp);
}
__ bind(NOT_EQUAL_NO_POP);
__ leave();
__ ret(lr);
return entry;
}
address generate_dsin_dcos(bool isCos) {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", isCos ? "libmDcos" : "libmDsin");
address start = __ pc();
__ generate_dsin_dcos(isCos, (address)StubRoutines::aarch64::_npio2_hw,
(address)StubRoutines::aarch64::_two_over_pi,
(address)StubRoutines::aarch64::_pio2,
(address)StubRoutines::aarch64::_dsin_coef,
(address)StubRoutines::aarch64::_dcos_coef);
return start;
}
address generate_dlog() {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "dlog");
address entry = __ pc();
FloatRegister vtmp0 = v0, vtmp1 = v1, vtmp2 = v2, vtmp3 = v3, vtmp4 = v4,
vtmp5 = v5, tmpC1 = v16, tmpC2 = v17, tmpC3 = v18, tmpC4 = v19;
Register tmp1 = r0, tmp2 = r1, tmp3 = r2, tmp4 = r3, tmp5 = r4;
__ fast_log(vtmp0, vtmp1, vtmp2, vtmp3, vtmp4, vtmp5, tmpC1, tmpC2, tmpC3,
tmpC4, tmp1, tmp2, tmp3, tmp4, tmp5);
return entry;
}
// code for comparing 16 bytes of strings with same encoding
void compare_string_16_bytes_same(Label &DIFF1, Label &DIFF2) {
Register result = r0, str1 = r1, cnt1 = r2, str2 = r3, tmp1 = r10, tmp2 = r11;
__ ldr(rscratch1, Address(__ post(str1, 8)));
__ eor(rscratch2, tmp1, tmp2);
__ ldr(cnt1, Address(__ post(str2, 8)));
__ cbnz(rscratch2, DIFF1);
__ ldr(tmp1, Address(__ post(str1, 8)));
__ eor(rscratch2, rscratch1, cnt1);
__ ldr(tmp2, Address(__ post(str2, 8)));
__ cbnz(rscratch2, DIFF2);
}
// code for comparing 16 characters of strings with Latin1 and Utf16 encoding
void compare_string_16_x_LU(Register tmpL, Register tmpU, Label &DIFF1,
Label &DIFF2) {
Register cnt1 = r2, tmp1 = r10, tmp2 = r11, tmp3 = r12;
FloatRegister vtmp = v1, vtmpZ = v0, vtmp3 = v2;
__ ldrq(vtmp, Address(__ post(tmp2, 16)));
__ ldr(tmpU, Address(__ post(cnt1, 8)));
__ zip1(vtmp3, __ T16B, vtmp, vtmpZ);
// now we have 32 bytes of characters (converted to U) in vtmp:vtmp3
__ fmovd(tmpL, vtmp3);
__ eor(rscratch2, tmp3, tmpL);
__ cbnz(rscratch2, DIFF2);
__ ldr(tmp3, Address(__ post(cnt1, 8)));
__ umov(tmpL, vtmp3, __ D, 1);
__ eor(rscratch2, tmpU, tmpL);
__ cbnz(rscratch2, DIFF1);
__ zip2(vtmp, __ T16B, vtmp, vtmpZ);
__ ldr(tmpU, Address(__ post(cnt1, 8)));
__ fmovd(tmpL, vtmp);
__ eor(rscratch2, tmp3, tmpL);
__ cbnz(rscratch2, DIFF2);
__ ldr(tmp3, Address(__ post(cnt1, 8)));
__ umov(tmpL, vtmp, __ D, 1);
__ eor(rscratch2, tmpU, tmpL);
__ cbnz(rscratch2, DIFF1);
}
// r0 = result
// r1 = str1
// r2 = cnt1
// r3 = str2
// r4 = cnt2
// r10 = tmp1
// r11 = tmp2
address generate_compare_long_string_different_encoding(bool isLU) {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", isLU
? "compare_long_string_different_encoding LU"
: "compare_long_string_different_encoding UL");
address entry = __ pc();
Label SMALL_LOOP, TAIL, TAIL_LOAD_16, LOAD_LAST, DIFF1, DIFF2,
DONE, CALCULATE_DIFFERENCE, LARGE_LOOP_PREFETCH, NO_PREFETCH,
LARGE_LOOP_PREFETCH_REPEAT1, LARGE_LOOP_PREFETCH_REPEAT2;
Register result = r0, str1 = r1, cnt1 = r2, str2 = r3, cnt2 = r4,
tmp1 = r10, tmp2 = r11, tmp3 = r12, tmp4 = r14;
FloatRegister vtmpZ = v0, vtmp = v1, vtmp3 = v2;
RegSet spilled_regs = RegSet::of(tmp3, tmp4);
int prefetchLoopExitCondition = MAX(64, SoftwarePrefetchHintDistance/2);
__ eor(vtmpZ, __ T16B, vtmpZ, vtmpZ);
// cnt2 == amount of characters left to compare
// Check already loaded first 4 symbols(vtmp and tmp2(LU)/tmp1(UL))
__ zip1(vtmp, __ T8B, vtmp, vtmpZ);
__ add(str1, str1, isLU ? wordSize/2 : wordSize);
__ add(str2, str2, isLU ? wordSize : wordSize/2);
__ fmovd(isLU ? tmp1 : tmp2, vtmp);
__ subw(cnt2, cnt2, 8); // Already loaded 4 symbols. Last 4 is special case.
__ add(str1, str1, cnt2, __ LSL, isLU ? 0 : 1);
__ eor(rscratch2, tmp1, tmp2);
__ add(str2, str2, cnt2, __ LSL, isLU ? 1 : 0);
__ mov(rscratch1, tmp2);
__ cbnz(rscratch2, CALCULATE_DIFFERENCE);
Register strU = isLU ? str2 : str1,
strL = isLU ? str1 : str2,
tmpU = isLU ? rscratch1 : tmp1, // where to keep U for comparison
tmpL = isLU ? tmp1 : rscratch1; // where to keep L for comparison
__ push(spilled_regs, sp);
__ sub(tmp2, strL, cnt2); // strL pointer to load from
__ sub(cnt1, strU, cnt2, __ LSL, 1); // strU pointer to load from
__ ldr(tmp3, Address(__ post(cnt1, 8)));
if (SoftwarePrefetchHintDistance >= 0) {
__ subs(rscratch2, cnt2, prefetchLoopExitCondition);
__ br(__ LT, NO_PREFETCH);
__ bind(LARGE_LOOP_PREFETCH);
__ prfm(Address(tmp2, SoftwarePrefetchHintDistance));
__ mov(tmp4, 2);
__ prfm(Address(cnt1, SoftwarePrefetchHintDistance));
__ bind(LARGE_LOOP_PREFETCH_REPEAT1);
compare_string_16_x_LU(tmpL, tmpU, DIFF1, DIFF2);
__ subs(tmp4, tmp4, 1);
__ br(__ GT, LARGE_LOOP_PREFETCH_REPEAT1);
__ prfm(Address(cnt1, SoftwarePrefetchHintDistance));
__ mov(tmp4, 2);
__ bind(LARGE_LOOP_PREFETCH_REPEAT2);
compare_string_16_x_LU(tmpL, tmpU, DIFF1, DIFF2);
__ subs(tmp4, tmp4, 1);
__ br(__ GT, LARGE_LOOP_PREFETCH_REPEAT2);
__ sub(cnt2, cnt2, 64);
__ subs(rscratch2, cnt2, prefetchLoopExitCondition);
__ br(__ GE, LARGE_LOOP_PREFETCH);
}
__ cbz(cnt2, LOAD_LAST); // no characters left except last load
__ bind(NO_PREFETCH);
__ subs(cnt2, cnt2, 16);
__ br(__ LT, TAIL);
__ bind(SMALL_LOOP); // smaller loop
__ subs(cnt2, cnt2, 16);
compare_string_16_x_LU(tmpL, tmpU, DIFF1, DIFF2);
__ br(__ GE, SMALL_LOOP);
__ cmn(cnt2, (u1)16);
__ br(__ EQ, LOAD_LAST);
__ bind(TAIL); // 1..15 characters left until last load (last 4 characters)
__ add(cnt1, cnt1, cnt2, __ LSL, 1); // Address of 8 bytes before last 4 characters in UTF-16 string
__ add(tmp2, tmp2, cnt2); // Address of 16 bytes before last 4 characters in Latin1 string
__ ldr(tmp3, Address(cnt1, -8));
compare_string_16_x_LU(tmpL, tmpU, DIFF1, DIFF2); // last 16 characters before last load
__ b(LOAD_LAST);
__ bind(DIFF2);
__ mov(tmpU, tmp3);
__ bind(DIFF1);
__ pop(spilled_regs, sp);
__ b(CALCULATE_DIFFERENCE);
__ bind(LOAD_LAST);
// Last 4 UTF-16 characters are already pre-loaded into tmp3 by compare_string_16_x_LU.
// No need to load it again
__ mov(tmpU, tmp3);
__ pop(spilled_regs, sp);
__ ldrs(vtmp, Address(strL));
__ zip1(vtmp, __ T8B, vtmp, vtmpZ);
__ fmovd(tmpL, vtmp);
__ eor(rscratch2, tmpU, tmpL);
__ cbz(rscratch2, DONE);
// Find the first different characters in the longwords and
// compute their difference.
__ bind(CALCULATE_DIFFERENCE);
__ rev(rscratch2, rscratch2);
__ clz(rscratch2, rscratch2);
__ andr(rscratch2, rscratch2, -16);
__ lsrv(tmp1, tmp1, rscratch2);
__ uxthw(tmp1, tmp1);
__ lsrv(rscratch1, rscratch1, rscratch2);
__ uxthw(rscratch1, rscratch1);
__ subw(result, tmp1, rscratch1);
__ bind(DONE);
__ ret(lr);
return entry;
}
// r0 = result
// r1 = str1
// r2 = cnt1
// r3 = str2
// r4 = cnt2
// r10 = tmp1
// r11 = tmp2
address generate_compare_long_string_same_encoding(bool isLL) {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", isLL
? "compare_long_string_same_encoding LL"
: "compare_long_string_same_encoding UU");
address entry = __ pc();
Register result = r0, str1 = r1, cnt1 = r2, str2 = r3, cnt2 = r4,
tmp1 = r10, tmp2 = r11;
Label SMALL_LOOP, LARGE_LOOP_PREFETCH, CHECK_LAST, DIFF2, TAIL,
LENGTH_DIFF, DIFF, LAST_CHECK_AND_LENGTH_DIFF,
DIFF_LAST_POSITION, DIFF_LAST_POSITION2;
// exit from large loop when less than 64 bytes left to read or we're about
// to prefetch memory behind array border
int largeLoopExitCondition = MAX(64, SoftwarePrefetchHintDistance)/(isLL ? 1 : 2);
// cnt1/cnt2 contains amount of characters to compare. cnt1 can be re-used
// update cnt2 counter with already loaded 8 bytes
__ sub(cnt2, cnt2, wordSize/(isLL ? 1 : 2));
// update pointers, because of previous read
__ add(str1, str1, wordSize);
__ add(str2, str2, wordSize);
if (SoftwarePrefetchHintDistance >= 0) {
__ bind(LARGE_LOOP_PREFETCH);
__ prfm(Address(str1, SoftwarePrefetchHintDistance));
__ prfm(Address(str2, SoftwarePrefetchHintDistance));
compare_string_16_bytes_same(DIFF, DIFF2);
compare_string_16_bytes_same(DIFF, DIFF2);
__ sub(cnt2, cnt2, isLL ? 64 : 32);
compare_string_16_bytes_same(DIFF, DIFF2);
__ subs(rscratch2, cnt2, largeLoopExitCondition);
compare_string_16_bytes_same(DIFF, DIFF2);
__ br(__ GT, LARGE_LOOP_PREFETCH);
__ cbz(cnt2, LAST_CHECK_AND_LENGTH_DIFF); // no more chars left?
}
// less than 16 bytes left?
__ subs(cnt2, cnt2, isLL ? 16 : 8);
__ br(__ LT, TAIL);
__ bind(SMALL_LOOP);
compare_string_16_bytes_same(DIFF, DIFF2);
__ subs(cnt2, cnt2, isLL ? 16 : 8);
__ br(__ GE, SMALL_LOOP);
__ bind(TAIL);
__ adds(cnt2, cnt2, isLL ? 16 : 8);
__ br(__ EQ, LAST_CHECK_AND_LENGTH_DIFF);
__ subs(cnt2, cnt2, isLL ? 8 : 4);
__ br(__ LE, CHECK_LAST);
__ eor(rscratch2, tmp1, tmp2);
__ cbnz(rscratch2, DIFF);
__ ldr(tmp1, Address(__ post(str1, 8)));
__ ldr(tmp2, Address(__ post(str2, 8)));
__ sub(cnt2, cnt2, isLL ? 8 : 4);
__ bind(CHECK_LAST);
if (!isLL) {
__ add(cnt2, cnt2, cnt2); // now in bytes
}
__ eor(rscratch2, tmp1, tmp2);
__ cbnz(rscratch2, DIFF);
__ ldr(rscratch1, Address(str1, cnt2));
__ ldr(cnt1, Address(str2, cnt2));
__ eor(rscratch2, rscratch1, cnt1);
__ cbz(rscratch2, LENGTH_DIFF);
// Find the first different characters in the longwords and
// compute their difference.
__ bind(DIFF2);
__ rev(rscratch2, rscratch2);
__ clz(rscratch2, rscratch2);
__ andr(rscratch2, rscratch2, isLL ? -8 : -16);
__ lsrv(rscratch1, rscratch1, rscratch2);
if (isLL) {
__ lsrv(cnt1, cnt1, rscratch2);
__ uxtbw(rscratch1, rscratch1);
__ uxtbw(cnt1, cnt1);
} else {
__ lsrv(cnt1, cnt1, rscratch2);
__ uxthw(rscratch1, rscratch1);
__ uxthw(cnt1, cnt1);
}
__ subw(result, rscratch1, cnt1);
__ b(LENGTH_DIFF);
__ bind(DIFF);
__ rev(rscratch2, rscratch2);
__ clz(rscratch2, rscratch2);
__ andr(rscratch2, rscratch2, isLL ? -8 : -16);
__ lsrv(tmp1, tmp1, rscratch2);
if (isLL) {
__ lsrv(tmp2, tmp2, rscratch2);
__ uxtbw(tmp1, tmp1);
__ uxtbw(tmp2, tmp2);
} else {
__ lsrv(tmp2, tmp2, rscratch2);
__ uxthw(tmp1, tmp1);
__ uxthw(tmp2, tmp2);
}
__ subw(result, tmp1, tmp2);
__ b(LENGTH_DIFF);
__ bind(LAST_CHECK_AND_LENGTH_DIFF);
__ eor(rscratch2, tmp1, tmp2);
__ cbnz(rscratch2, DIFF);
__ bind(LENGTH_DIFF);
__ ret(lr);
return entry;
}
void generate_compare_long_strings() {
StubRoutines::aarch64::_compare_long_string_LL
= generate_compare_long_string_same_encoding(true);
StubRoutines::aarch64::_compare_long_string_UU
= generate_compare_long_string_same_encoding(false);
StubRoutines::aarch64::_compare_long_string_LU
= generate_compare_long_string_different_encoding(true);
StubRoutines::aarch64::_compare_long_string_UL
= generate_compare_long_string_different_encoding(false);
}
// R0 = result
// R1 = str2
// R2 = cnt1
// R3 = str1
// R4 = cnt2
// This generic linear code use few additional ideas, which makes it faster:
// 1) we can safely keep at least 1st register of pattern(since length >= 8)
// in order to skip initial loading(help in systems with 1 ld pipeline)
// 2) we can use "fast" algorithm of finding single character to search for
// first symbol with less branches(1 branch per each loaded register instead
// of branch for each symbol), so, this is where constants like
// 0x0101...01, 0x00010001...0001, 0x7f7f...7f, 0x7fff7fff...7fff comes from
// 3) after loading and analyzing 1st register of source string, it can be
// used to search for every 1st character entry, saving few loads in
// comparison with "simplier-but-slower" implementation
// 4) in order to avoid lots of push/pop operations, code below is heavily
// re-using/re-initializing/compressing register values, which makes code
// larger and a bit less readable, however, most of extra operations are
// issued during loads or branches, so, penalty is minimal
address generate_string_indexof_linear(bool str1_isL, bool str2_isL) {
const char* stubName = str1_isL
? (str2_isL ? "indexof_linear_ll" : "indexof_linear_ul")
: "indexof_linear_uu";
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", stubName);
address entry = __ pc();
int str1_chr_size = str1_isL ? 1 : 2;
int str2_chr_size = str2_isL ? 1 : 2;
int str1_chr_shift = str1_isL ? 0 : 1;
int str2_chr_shift = str2_isL ? 0 : 1;
bool isL = str1_isL && str2_isL;
// parameters
Register result = r0, str2 = r1, cnt1 = r2, str1 = r3, cnt2 = r4;
// temporary registers
Register tmp1 = r20, tmp2 = r21, tmp3 = r22, tmp4 = r23;
RegSet spilled_regs = RegSet::range(tmp1, tmp4);
// redefinitions
Register ch1 = rscratch1, ch2 = rscratch2, first = tmp3;
__ push(spilled_regs, sp);
Label L_LOOP, L_LOOP_PROCEED, L_SMALL, L_HAS_ZERO,
L_HAS_ZERO_LOOP, L_CMP_LOOP, L_CMP_LOOP_NOMATCH, L_SMALL_PROCEED,
L_SMALL_HAS_ZERO_LOOP, L_SMALL_CMP_LOOP_NOMATCH, L_SMALL_CMP_LOOP,
L_POST_LOOP, L_CMP_LOOP_LAST_CMP, L_HAS_ZERO_LOOP_NOMATCH,
L_SMALL_CMP_LOOP_LAST_CMP, L_SMALL_CMP_LOOP_LAST_CMP2,
L_CMP_LOOP_LAST_CMP2, DONE, NOMATCH;
// Read whole register from str1. It is safe, because length >=8 here
__ ldr(ch1, Address(str1));
// Read whole register from str2. It is safe, because length >=8 here
__ ldr(ch2, Address(str2));
__ sub(cnt2, cnt2, cnt1);
__ andr(first, ch1, str1_isL ? 0xFF : 0xFFFF);
if (str1_isL != str2_isL) {
__ eor(v0, __ T16B, v0, v0);
}
__ mov(tmp1, str2_isL ? 0x0101010101010101 : 0x0001000100010001);
__ mul(first, first, tmp1);
// check if we have less than 1 register to check
__ subs(cnt2, cnt2, wordSize/str2_chr_size - 1);
if (str1_isL != str2_isL) {
__ fmovd(v1, ch1);
}
__ br(__ LE, L_SMALL);
__ eor(ch2, first, ch2);
if (str1_isL != str2_isL) {
__ zip1(v1, __ T16B, v1, v0);
}
__ sub(tmp2, ch2, tmp1);
__ orr(ch2, ch2, str2_isL ? 0x7f7f7f7f7f7f7f7f : 0x7fff7fff7fff7fff);
__ bics(tmp2, tmp2, ch2);
if (str1_isL != str2_isL) {
__ fmovd(ch1, v1);
}
__ br(__ NE, L_HAS_ZERO);
__ subs(cnt2, cnt2, wordSize/str2_chr_size);
__ add(result, result, wordSize/str2_chr_size);
__ add(str2, str2, wordSize);
__ br(__ LT, L_POST_LOOP);
__ BIND(L_LOOP);
__ ldr(ch2, Address(str2));
__ eor(ch2, first, ch2);
__ sub(tmp2, ch2, tmp1);
__ orr(ch2, ch2, str2_isL ? 0x7f7f7f7f7f7f7f7f : 0x7fff7fff7fff7fff);
__ bics(tmp2, tmp2, ch2);
__ br(__ NE, L_HAS_ZERO);
__ BIND(L_LOOP_PROCEED);
__ subs(cnt2, cnt2, wordSize/str2_chr_size);
__ add(str2, str2, wordSize);
__ add(result, result, wordSize/str2_chr_size);
__ br(__ GE, L_LOOP);
__ BIND(L_POST_LOOP);
__ subs(zr, cnt2, -wordSize/str2_chr_size); // no extra characters to check
__ br(__ LE, NOMATCH);
__ ldr(ch2, Address(str2));
__ sub(cnt2, zr, cnt2, __ LSL, LogBitsPerByte + str2_chr_shift);
__ eor(ch2, first, ch2);
__ sub(tmp2, ch2, tmp1);
__ orr(ch2, ch2, str2_isL ? 0x7f7f7f7f7f7f7f7f : 0x7fff7fff7fff7fff);
__ mov(tmp4, -1); // all bits set
__ b(L_SMALL_PROCEED);
__ align(OptoLoopAlignment);
__ BIND(L_SMALL);
__ sub(cnt2, zr, cnt2, __ LSL, LogBitsPerByte + str2_chr_shift);
__ eor(ch2, first, ch2);
if (str1_isL != str2_isL) {
__ zip1(v1, __ T16B, v1, v0);
}
__ sub(tmp2, ch2, tmp1);
__ mov(tmp4, -1); // all bits set
__ orr(ch2, ch2, str2_isL ? 0x7f7f7f7f7f7f7f7f : 0x7fff7fff7fff7fff);
if (str1_isL != str2_isL) {
__ fmovd(ch1, v1); // move converted 4 symbols
}
__ BIND(L_SMALL_PROCEED);
__ lsrv(tmp4, tmp4, cnt2); // mask. zeroes on useless bits.
__ bic(tmp2, tmp2, ch2);
__ ands(tmp2, tmp2, tmp4); // clear useless bits and check
__ rbit(tmp2, tmp2);
__ br(__ EQ, NOMATCH);
__ BIND(L_SMALL_HAS_ZERO_LOOP);
__ clz(tmp4, tmp2); // potentially long. Up to 4 cycles on some cpu's
__ cmp(cnt1, u1(wordSize/str2_chr_size));
__ br(__ LE, L_SMALL_CMP_LOOP_LAST_CMP2);
if (str2_isL) { // LL
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte); // address of "index"
__ ldr(ch2, Address(str2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4); // shift off leading zeroes from match info
__ add(result, result, tmp4, __ LSR, LogBitsPerByte);
__ lsl(tmp2, tmp2, 1); // shift off leading "1" from match info
} else {
__ mov(ch2, 0xE); // all bits in byte set except last one
__ andr(ch2, ch2, tmp4, __ LSR, LogBitsPerByte); // byte shift amount
__ ldr(ch2, Address(str2, ch2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4);
__ add(result, result, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ lsl(tmp2, tmp2, 1); // shift off leading "1" from match info
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
}
__ cmp(ch1, ch2);
__ mov(tmp4, wordSize/str2_chr_size);
__ br(__ NE, L_SMALL_CMP_LOOP_NOMATCH);
__ BIND(L_SMALL_CMP_LOOP);
str1_isL ? __ ldrb(first, Address(str1, tmp4, Address::lsl(str1_chr_shift)))
: __ ldrh(first, Address(str1, tmp4, Address::lsl(str1_chr_shift)));
str2_isL ? __ ldrb(ch2, Address(str2, tmp4, Address::lsl(str2_chr_shift)))
: __ ldrh(ch2, Address(str2, tmp4, Address::lsl(str2_chr_shift)));
__ add(tmp4, tmp4, 1);
__ cmp(tmp4, cnt1);
__ br(__ GE, L_SMALL_CMP_LOOP_LAST_CMP);
__ cmp(first, ch2);
__ br(__ EQ, L_SMALL_CMP_LOOP);
__ BIND(L_SMALL_CMP_LOOP_NOMATCH);
__ cbz(tmp2, NOMATCH); // no more matches. exit
__ clz(tmp4, tmp2);
__ add(result, result, 1); // advance index
__ add(str2, str2, str2_chr_size); // advance pointer
__ b(L_SMALL_HAS_ZERO_LOOP);
__ align(OptoLoopAlignment);
__ BIND(L_SMALL_CMP_LOOP_LAST_CMP);
__ cmp(first, ch2);
__ br(__ NE, L_SMALL_CMP_LOOP_NOMATCH);
__ b(DONE);
__ align(OptoLoopAlignment);
__ BIND(L_SMALL_CMP_LOOP_LAST_CMP2);
if (str2_isL) { // LL
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte); // address of "index"
__ ldr(ch2, Address(str2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4); // shift off leading zeroes from match info
__ add(result, result, tmp4, __ LSR, LogBitsPerByte);
__ lsl(tmp2, tmp2, 1); // shift off leading "1" from match info
} else {
__ mov(ch2, 0xE); // all bits in byte set except last one
__ andr(ch2, ch2, tmp4, __ LSR, LogBitsPerByte); // byte shift amount
__ ldr(ch2, Address(str2, ch2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4);
__ add(result, result, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ lsl(tmp2, tmp2, 1); // shift off leading "1" from match info
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
}
__ cmp(ch1, ch2);
__ br(__ NE, L_SMALL_CMP_LOOP_NOMATCH);
__ b(DONE);
__ align(OptoLoopAlignment);
__ BIND(L_HAS_ZERO);
__ rbit(tmp2, tmp2);
__ clz(tmp4, tmp2); // potentially long. Up to 4 cycles on some CPU's
// Now, perform compression of counters(cnt2 and cnt1) into one register.
// It's fine because both counters are 32bit and are not changed in this
// loop. Just restore it on exit. So, cnt1 can be re-used in this loop.
__ orr(cnt2, cnt2, cnt1, __ LSL, BitsPerByte * wordSize / 2);
__ sub(result, result, 1);
__ BIND(L_HAS_ZERO_LOOP);
__ mov(cnt1, wordSize/str2_chr_size);
__ cmp(cnt1, cnt2, __ LSR, BitsPerByte * wordSize / 2);
__ br(__ GE, L_CMP_LOOP_LAST_CMP2); // case of 8 bytes only to compare
if (str2_isL) {
__ lsr(ch2, tmp4, LogBitsPerByte + str2_chr_shift); // char index
__ ldr(ch2, Address(str2, ch2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4);
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ add(tmp4, tmp4, 1);
__ add(result, result, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ lsl(tmp2, tmp2, 1);
__ mov(tmp4, wordSize/str2_chr_size);
} else {
__ mov(ch2, 0xE);
__ andr(ch2, ch2, tmp4, __ LSR, LogBitsPerByte); // byte shift amount
__ ldr(ch2, Address(str2, ch2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4);
__ add(tmp4, tmp4, 1);
__ add(result, result, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte);
__ lsl(tmp2, tmp2, 1);
__ mov(tmp4, wordSize/str2_chr_size);
__ sub(str2, str2, str2_chr_size);
}
__ cmp(ch1, ch2);
__ mov(tmp4, wordSize/str2_chr_size);
__ br(__ NE, L_CMP_LOOP_NOMATCH);
__ BIND(L_CMP_LOOP);
str1_isL ? __ ldrb(cnt1, Address(str1, tmp4, Address::lsl(str1_chr_shift)))
: __ ldrh(cnt1, Address(str1, tmp4, Address::lsl(str1_chr_shift)));
str2_isL ? __ ldrb(ch2, Address(str2, tmp4, Address::lsl(str2_chr_shift)))
: __ ldrh(ch2, Address(str2, tmp4, Address::lsl(str2_chr_shift)));
__ add(tmp4, tmp4, 1);
__ cmp(tmp4, cnt2, __ LSR, BitsPerByte * wordSize / 2);
__ br(__ GE, L_CMP_LOOP_LAST_CMP);
__ cmp(cnt1, ch2);
__ br(__ EQ, L_CMP_LOOP);
__ BIND(L_CMP_LOOP_NOMATCH);
// here we're not matched
__ cbz(tmp2, L_HAS_ZERO_LOOP_NOMATCH); // no more matches. Proceed to main loop
__ clz(tmp4, tmp2);
__ add(str2, str2, str2_chr_size); // advance pointer
__ b(L_HAS_ZERO_LOOP);
__ align(OptoLoopAlignment);
__ BIND(L_CMP_LOOP_LAST_CMP);
__ cmp(cnt1, ch2);
__ br(__ NE, L_CMP_LOOP_NOMATCH);
__ b(DONE);
__ align(OptoLoopAlignment);
__ BIND(L_CMP_LOOP_LAST_CMP2);
if (str2_isL) {
__ lsr(ch2, tmp4, LogBitsPerByte + str2_chr_shift); // char index
__ ldr(ch2, Address(str2, ch2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4);
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ add(tmp4, tmp4, 1);
__ add(result, result, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ lsl(tmp2, tmp2, 1);
} else {
__ mov(ch2, 0xE);
__ andr(ch2, ch2, tmp4, __ LSR, LogBitsPerByte); // byte shift amount
__ ldr(ch2, Address(str2, ch2)); // read whole register of str2. Safe.
__ lslv(tmp2, tmp2, tmp4);
__ add(tmp4, tmp4, 1);
__ add(result, result, tmp4, __ LSR, LogBitsPerByte + str2_chr_shift);
__ add(str2, str2, tmp4, __ LSR, LogBitsPerByte);
__ lsl(tmp2, tmp2, 1);
__ sub(str2, str2, str2_chr_size);
}
__ cmp(ch1, ch2);
__ br(__ NE, L_CMP_LOOP_NOMATCH);
__ b(DONE);
__ align(OptoLoopAlignment);
__ BIND(L_HAS_ZERO_LOOP_NOMATCH);
// 1) Restore "result" index. Index was wordSize/str2_chr_size * N until
// L_HAS_ZERO block. Byte octet was analyzed in L_HAS_ZERO_LOOP,
// so, result was increased at max by wordSize/str2_chr_size - 1, so,
// respective high bit wasn't changed. L_LOOP_PROCEED will increase
// result by analyzed characters value, so, we can just reset lower bits
// in result here. Clear 2 lower bits for UU/UL and 3 bits for LL
// 2) restore cnt1 and cnt2 values from "compressed" cnt2
// 3) advance str2 value to represent next str2 octet. result & 7/3 is
// index of last analyzed substring inside current octet. So, str2 in at
// respective start address. We need to advance it to next octet
__ andr(tmp2, result, wordSize/str2_chr_size - 1); // symbols analyzed
__ lsr(cnt1, cnt2, BitsPerByte * wordSize / 2);
__ bfm(result, zr, 0, 2 - str2_chr_shift);
__ sub(str2, str2, tmp2, __ LSL, str2_chr_shift); // restore str2
__ movw(cnt2, cnt2);
__ b(L_LOOP_PROCEED);
__ align(OptoLoopAlignment);
__ BIND(NOMATCH);
__ mov(result, -1);
__ BIND(DONE);
__ pop(spilled_regs, sp);
__ ret(lr);
return entry;
}
void generate_string_indexof_stubs() {
StubRoutines::aarch64::_string_indexof_linear_ll = generate_string_indexof_linear(true, true);
StubRoutines::aarch64::_string_indexof_linear_uu = generate_string_indexof_linear(false, false);
StubRoutines::aarch64::_string_indexof_linear_ul = generate_string_indexof_linear(true, false);
}
void inflate_and_store_2_fp_registers(bool generatePrfm,
FloatRegister src1, FloatRegister src2) {
Register dst = r1;
__ zip1(v1, __ T16B, src1, v0);
__ zip2(v2, __ T16B, src1, v0);
if (generatePrfm) {
__ prfm(Address(dst, SoftwarePrefetchHintDistance), PSTL1STRM);
}
__ zip1(v3, __ T16B, src2, v0);
__ zip2(v4, __ T16B, src2, v0);
__ st1(v1, v2, v3, v4, __ T16B, Address(__ post(dst, 64)));
}
// R0 = src
// R1 = dst
// R2 = len
// R3 = len >> 3
// V0 = 0
// v1 = loaded 8 bytes
address generate_large_byte_array_inflate() {
__ align(CodeEntryAlignment);
StubCodeMark mark(this, "StubRoutines", "large_byte_array_inflate");
address entry = __ pc();
Label LOOP, LOOP_START, LOOP_PRFM, LOOP_PRFM_START, DONE;
Register src = r0, dst = r1, len = r2, octetCounter = r3;
const int large_loop_threshold = MAX(64, SoftwarePrefetchHintDistance)/8 + 4;
// do one more 8-byte read to have address 16-byte aligned in most cases
// also use single store instruction
__ ldrd(v2, __ post(src, 8));
__ sub(octetCounter, octetCounter, 2);
__ zip1(v1, __ T16B, v1, v0);
__ zip1(v2, __ T16B, v2, v0);
__ st1(v1, v2, __ T16B, __ post(dst, 32));
__ ld1(v3, v4, v5, v6, __ T16B, Address(__ post(src, 64)));
__ subs(rscratch1, octetCounter, large_loop_threshold);
__ br(__ LE, LOOP_START);
__ b(LOOP_PRFM_START);
__ bind(LOOP_PRFM);
__ ld1(v3, v4, v5, v6, __ T16B, Address(__ post(src, 64)));
__ bind(LOOP_PRFM_START);
__ prfm(Address(src, SoftwarePrefetchHintDistance));
__ sub(octetCounter, octetCounter, 8);
__ subs(rscratch1, octetCounter, large_loop_threshold);
inflate_and_store_2_fp_registers(true, v3, v4);
inflate_and_store_2_fp_registers(true, v5, v6);
__ br(__ GT, LOOP_PRFM);
__ cmp(octetCounter, (u1)8);
__ br(__ LT, DONE);
__ bind(LOOP);
__ ld1(v3, v4, v5, v6, __ T16B, Address(__ post(src, 64)));
__ bind(LOOP_START);
__ sub(octetCounter, octetCounter, 8);
__ cmp(octetCounter, (u1)8);
inflate_and_store_2_fp_registers(false, v3, v4);
inflate_and_store_2_fp_registers(false, v5, v6);
__ br(__ GE, LOOP);
__ bind(DONE);
__ ret(lr);
return entry;
}
/**
* Arguments:
*
* Input:
* c_rarg0 - current state address
* c_rarg1 - H key address
* c_rarg2 - data address
* c_rarg3 - number of blocks
*
* Output:
* Updated state at c_rarg0
*/
address generate_ghash_processBlocks() {
// Bafflingly, GCM uses little-endian for the byte order, but
// big-endian for the bit order. For example, the polynomial 1 is
// represented as the 16-byte string 80 00 00 00 | 12 bytes of 00.
//
// So, we must either reverse the bytes in each word and do
// everything big-endian or reverse the bits in each byte and do
// it little-endian. On AArch64 it's more idiomatic to reverse
// the bits in each byte (we have an instruction, RBIT, to do
// that) and keep the data in little-endian bit order throught the
// calculation, bit-reversing the inputs and outputs.
StubCodeMark mark(this, "StubRoutines", "ghash_processBlocks");
__ align(wordSize * 2);
address p = __ pc();
__ emit_int64(0x87); // The low-order bits of the field
// polynomial (i.e. p = z^7+z^2+z+1)
// repeated in the low and high parts of a
// 128-bit vector
__ emit_int64(0x87);
__ align(CodeEntryAlignment);
address start = __ pc();
Register state = c_rarg0;
Register subkeyH = c_rarg1;
Register data = c_rarg2;
Register blocks = c_rarg3;
FloatRegister vzr = v30;
__ eor(vzr, __ T16B, vzr, vzr); // zero register
__ ldrq(v0, Address(state));
__ ldrq(v1, Address(subkeyH));
__ rev64(v0, __ T16B, v0); // Bit-reverse words in state and subkeyH
__ rbit(v0, __ T16B, v0);
__ rev64(v1, __ T16B, v1);
__ rbit(v1, __ T16B, v1);
__ ldrq(v26, p);
__ ext(v16, __ T16B, v1, v1, 0x08); // long-swap subkeyH into v1
__ eor(v16, __ T16B, v16, v1); // xor subkeyH into subkeyL (Karatsuba: (A1+A0))
{
Label L_ghash_loop;
__ bind(L_ghash_loop);
__ ldrq(v2, Address(__ post(data, 0x10))); // Load the data, bit
// reversing each byte
__ rbit(v2, __ T16B, v2);
__ eor(v2, __ T16B, v0, v2); // bit-swapped data ^ bit-swapped state
// Multiply state in v2 by subkey in v1
ghash_multiply(/*result_lo*/v5, /*result_hi*/v7,
/*a*/v1, /*b*/v2, /*a1_xor_a0*/v16,
/*temps*/v6, v20, v18, v21);
// Reduce v7:v5 by the field polynomial
ghash_reduce(v0, v5, v7, v26, vzr, v20);
__ sub(blocks, blocks, 1);
__ cbnz(blocks, L_ghash_loop);
}
// The bit-reversed result is at this point in v0
__ rev64(v1, __ T16B, v0);
__ rbit(v1, __ T16B, v1);
__ st1(v1, __ T16B, state);
__ ret(lr);
return start;
}
// Continuation point for throwing of implicit exceptions that are
// not handled in the current activation. Fabricates an exception
// oop and initiates normal exception dispatching in this
// frame. Since we need to preserve callee-saved values (currently
// only for C2, but done for C1 as well) we need a callee-saved oop
// map and therefore have to make these stubs into RuntimeStubs
// rather than BufferBlobs. If the compiler needs all registers to
// be preserved between the fault point and the exception handler
// then it must assume responsibility for that in
// AbstractCompiler::continuation_for_implicit_null_exception or
// continuation_for_implicit_division_by_zero_exception. All other
// implicit exceptions (e.g., NullPointerException or
// AbstractMethodError on entry) are either at call sites or
// otherwise assume that stack unwinding will be initiated, so
// caller saved registers were assumed volatile in the compiler.
#undef __
#define __ masm->
address generate_throw_exception(const char* name,
address runtime_entry,
Register arg1 = noreg,
Register arg2 = noreg) {
// Information about frame layout at time of blocking runtime call.
// Note that we only have to preserve callee-saved registers since
// the compilers are responsible for supplying a continuation point
// if they expect all registers to be preserved.
// n.b. aarch64 asserts that frame::arg_reg_save_area_bytes == 0
enum layout {
rfp_off = 0,
rfp_off2,
return_off,
return_off2,
framesize // inclusive of return address
};
int insts_size = 512;
int locs_size = 64;
CodeBuffer code(name, insts_size, locs_size);
OopMapSet* oop_maps = new OopMapSet();
MacroAssembler* masm = new MacroAssembler(&code);
address start = __ pc();
// This is an inlined and slightly modified version of call_VM
// which has the ability to fetch the return PC out of
// thread-local storage and also sets up last_Java_sp slightly
// differently than the real call_VM
__ enter(); // Save FP and LR before call
assert(is_even(framesize/2), "sp not 16-byte aligned");
// lr and fp are already in place
__ sub(sp, rfp, ((unsigned)framesize-4) << LogBytesPerInt); // prolog
int frame_complete = __ pc() - start;
// Set up last_Java_sp and last_Java_fp
address the_pc = __ pc();
__ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
// Call runtime
if (arg1 != noreg) {
assert(arg2 != c_rarg1, "clobbered");
__ mov(c_rarg1, arg1);
}
if (arg2 != noreg) {
__ mov(c_rarg2, arg2);
}
__ mov(c_rarg0, rthread);
BLOCK_COMMENT("call runtime_entry");
__ mov(rscratch1, runtime_entry);
__ blr(rscratch1);
// Generate oop map
OopMap* map = new OopMap(framesize, 0);
oop_maps->add_gc_map(the_pc - start, map);
__ reset_last_Java_frame(true);
__ maybe_isb();
__ leave();
// check for pending exceptions
#ifdef ASSERT
Label L;
__ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
__ cbnz(rscratch1, L);
__ should_not_reach_here();
__ bind(L);
#endif // ASSERT
__ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
// codeBlob framesize is in words (not VMRegImpl::slot_size)
RuntimeStub* stub =
RuntimeStub::new_runtime_stub(name,
&code,
frame_complete,
(framesize >> (LogBytesPerWord - LogBytesPerInt)),
oop_maps, false);
return stub->entry_point();
}
class MontgomeryMultiplyGenerator : public MacroAssembler {
Register Pa_base, Pb_base, Pn_base, Pm_base, inv, Rlen, Ra, Rb, Rm, Rn,
Pa, Pb, Pn, Pm, Rhi_ab, Rlo_ab, Rhi_mn, Rlo_mn, t0, t1, t2, Ri, Rj;
RegSet _toSave;
bool _squaring;
public:
MontgomeryMultiplyGenerator (Assembler *as, bool squaring)
: MacroAssembler(as->code()), _squaring(squaring) {
// Register allocation
Register reg = c_rarg0;
Pa_base = reg; // Argument registers
if (squaring)
Pb_base = Pa_base;
else
Pb_base = ++reg;
Pn_base = ++reg;
Rlen= ++reg;
inv = ++reg;
Pm_base = ++reg;
// Working registers:
Ra = ++reg; // The current digit of a, b, n, and m.
Rb = ++reg;
Rm = ++reg;
Rn = ++reg;
Pa = ++reg; // Pointers to the current/next digit of a, b, n, and m.
Pb = ++reg;
Pm = ++reg;
Pn = ++reg;
t0 = ++reg; // Three registers which form a
t1 = ++reg; // triple-precision accumuator.
t2 = ++reg;
Ri = ++reg; // Inner and outer loop indexes.
Rj = ++reg;
Rhi_ab = ++reg; // Product registers: low and high parts
Rlo_ab = ++reg; // of a*b and m*n.
Rhi_mn = ++reg;
Rlo_mn = ++reg;
// r19 and up are callee-saved.
_toSave = RegSet::range(r19, reg) + Pm_base;
}
private:
void save_regs() {
push(_toSave, sp);
}
void restore_regs() {
pop(_toSave, sp);
}
template <typename T>
void unroll_2(Register count, T block) {
Label loop, end, odd;
tbnz(count, 0, odd);
cbz(count, end);
align(16);
bind(loop);
(this->*block)();
bind(odd);
(this->*block)();
subs(count, count, 2);
br(Assembler::GT, loop);
bind(end);
}
template <typename T>
void unroll_2(Register count, T block, Register d, Register s, Register tmp) {
Label loop, end, odd;
tbnz(count, 0, odd);
cbz(count, end);
align(16);
bind(loop);
(this->*block)(d, s, tmp);
bind(odd);
(this->*block)(d, s, tmp);
subs(count, count, 2);
br(Assembler::GT, loop);
bind(end);
}
void pre1(RegisterOrConstant i) {
block_comment("pre1");
// Pa = Pa_base;
// Pb = Pb_base + i;
// Pm = Pm_base;
// Pn = Pn_base + i;
// Ra = *Pa;
// Rb = *Pb;
// Rm = *Pm;
// Rn = *Pn;
ldr(Ra, Address(Pa_base));
ldr(Rb, Address(Pb_base, i, Address::uxtw(LogBytesPerWord)));
ldr(Rm, Address(Pm_base));
ldr(Rn, Address(Pn_base, i, Address::uxtw(LogBytesPerWord)));
lea(Pa, Address(Pa_base));
lea(Pb, Address(Pb_base, i, Address::uxtw(LogBytesPerWord)));
lea(Pm, Address(Pm_base));
lea(Pn, Address(Pn_base, i, Address::uxtw(LogBytesPerWord)));
// Zero the m*n result.
mov(Rhi_mn, zr);
mov(Rlo_mn, zr);
}
// The core multiply-accumulate step of a Montgomery
// multiplication. The idea is to schedule operations as a
// pipeline so that instructions with long latencies (loads and
// multiplies) have time to complete before their results are
// used. This most benefits in-order implementations of the
// architecture but out-of-order ones also benefit.
void step() {
block_comment("step");
// MACC(Ra, Rb, t0, t1, t2);
// Ra = *++Pa;
// Rb = *--Pb;
umulh(Rhi_ab, Ra, Rb);
mul(Rlo_ab, Ra, Rb);
ldr(Ra, pre(Pa, wordSize));
ldr(Rb, pre(Pb, -wordSize));
acc(Rhi_mn, Rlo_mn, t0, t1, t2); // The pending m*n from the
// previous iteration.
// MACC(Rm, Rn, t0, t1, t2);
// Rm = *++Pm;
// Rn = *--Pn;
umulh(Rhi_mn, Rm, Rn);
mul(Rlo_mn, Rm, Rn);
ldr(Rm, pre(Pm, wordSize));
ldr(Rn, pre(Pn, -wordSize));
acc(Rhi_ab, Rlo_ab, t0, t1, t2);
}
void post1() {
block_comment("post1");
// MACC(Ra, Rb, t0, t1, t2);
// Ra = *++Pa;
// Rb = *--Pb;
umulh(Rhi_ab, Ra, Rb);
mul(Rlo_ab, Ra, Rb);
acc(Rhi_mn, Rlo_mn, t0, t1, t2); // The pending m*n
acc(Rhi_ab, Rlo_ab, t0, t1, t2);
// *Pm = Rm = t0 * inv;
mul(Rm, t0, inv);
str(Rm, Address(Pm));
// MACC(Rm, Rn, t0, t1, t2);
// t0 = t1; t1 = t2; t2 = 0;
umulh(Rhi_mn, Rm, Rn);
#ifndef PRODUCT
// assert(m[i] * n[0] + t0 == 0, "broken Montgomery multiply");
{
mul(Rlo_mn, Rm, Rn);
add(Rlo_mn, t0, Rlo_mn);
Label ok;
cbz(Rlo_mn, ok); {
stop("broken Montgomery multiply");
} bind(ok);
}
#endif
// We have very carefully set things up so that
// m[i]*n[0] + t0 == 0 (mod b), so we don't have to calculate
// the lower half of Rm * Rn because we know the result already:
// it must be -t0. t0 + (-t0) must generate a carry iff
// t0 != 0. So, rather than do a mul and an adds we just set
// the carry flag iff t0 is nonzero.
//
// mul(Rlo_mn, Rm, Rn);
// adds(zr, t0, Rlo_mn);
subs(zr, t0, 1); // Set carry iff t0 is nonzero
adcs(t0, t1, Rhi_mn);
adc(t1, t2, zr);
mov(t2, zr);
}
void pre2(RegisterOrConstant i, RegisterOrConstant len) {
block_comment("pre2");
// Pa = Pa_base + i-len;
// Pb = Pb_base + len;
// Pm = Pm_base + i-len;
// Pn = Pn_base + len;
if (i.is_register()) {
sub(Rj, i.as_register(), len);
} else {
mov(Rj, i.as_constant());
sub(Rj, Rj, len);
}
// Rj == i-len
lea(Pa, Address(Pa_base, Rj, Address::uxtw(LogBytesPerWord)));
lea(Pb, Address(Pb_base, len, Address::uxtw(LogBytesPerWord)));
lea(Pm, Address(Pm_base, Rj, Address::uxtw(LogBytesPerWord)));
lea(Pn, Address(Pn_base, len, Address::uxtw(LogBytesPerWord)));
// Ra = *++Pa;
// Rb = *--Pb;
// Rm = *++Pm;
// Rn = *--Pn;
ldr(Ra, pre(Pa, wordSize));
ldr(Rb, pre(Pb, -wordSize));
ldr(Rm, pre(Pm, wordSize));
ldr(Rn, pre(Pn, -wordSize));
mov(Rhi_mn, zr);
mov(Rlo_mn, zr);
}
void post2(RegisterOrConstant i, RegisterOrConstant len) {
block_comment("post2");
if (i.is_constant()) {
mov(Rj, i.as_constant()-len.as_constant());
} else {
sub(Rj, i.as_register(), len);
}
adds(t0, t0, Rlo_mn); // The pending m*n, low part
// As soon as we know the least significant digit of our result,
// store it.
// Pm_base[i-len] = t0;
str(t0, Address(Pm_base, Rj, Address::uxtw(LogBytesPerWord)));
// t0 = t1; t1 = t2; t2 = 0;
adcs(t0, t1, Rhi_mn); // The pending m*n, high part
adc(t1, t2, zr);
mov(t2, zr);
}
// A carry in t0 after Montgomery multiplication means that we
// should subtract multiples of n from our result in m. We'll
// keep doing that until there is no carry.
void normalize(RegisterOrConstant len) {
block_comment("normalize");
// while (t0)
// t0 = sub(Pm_base, Pn_base, t0, len);
Label loop, post, again;
Register cnt = t1, i = t2; // Re-use registers; we're done with them now
cbz(t0, post); {
bind(again); {
mov(i, zr);
mov(cnt, len);
ldr(Rm, Address(Pm_base, i, Address::uxtw(LogBytesPerWord)));
ldr(Rn, Address(Pn_base, i, Address::uxtw(LogBytesPerWord)));
subs(zr, zr, zr); // set carry flag, i.e. no borrow
align(16);
bind(loop); {
sbcs(Rm, Rm, Rn);
str(Rm, Address(Pm_base, i, Address::uxtw(LogBytesPerWord)));
add(i, i, 1);
ldr(Rm, Address(Pm_base, i, Address::uxtw(LogBytesPerWord)));
ldr(Rn, Address(Pn_base, i, Address::uxtw(LogBytesPerWord)));
sub(cnt, cnt, 1);
} cbnz(cnt, loop);
sbc(t0, t0, zr);
} cbnz(t0, again);
} bind(post);
}
// Move memory at s to d, reversing words.
// Increments d to end of copied memory
// Destroys tmp1, tmp2
// Preserves len
// Leaves s pointing to the address which was in d at start
void reverse(Register d, Register s, Register len, Register tmp1, Register tmp2) {
assert(tmp1 < r19 && tmp2 < r19, "register corruption");
lea(s, Address(s, len, Address::uxtw(LogBytesPerWord)));
mov(tmp1, len);
unroll_2(tmp1, &MontgomeryMultiplyGenerator::reverse1, d, s, tmp2);
sub(s, d, len, ext::uxtw, LogBytesPerWord);
}
// where
void reverse1(Register d, Register s, Register tmp) {
ldr(tmp, pre(s, -wordSize));
ror(tmp, tmp, 32);
str(tmp, post(d, wordSize));
}
void step_squaring() {
// An extra ACC
step();
acc(Rhi_ab, Rlo_ab, t0, t1, t2);
}
void last_squaring(RegisterOrConstant i) {
Label dont;
// if ((i & 1) == 0) {
tbnz(i.as_register(), 0, dont); {
// MACC(Ra, Rb, t0, t1, t2);
// Ra = *++Pa;
// Rb = *--Pb;
umulh(Rhi_ab, Ra, Rb);
mul(Rlo_ab, Ra, Rb);
acc(Rhi_ab, Rlo_ab, t0, t1, t2);
} bind(dont);
}
void extra_step_squaring() {
acc(Rhi_mn, Rlo_mn, t0, t1, t2); // The pending m*n
// MACC(Rm, Rn, t0, t1, t2);
// Rm = *++Pm;
// Rn = *--Pn;
umulh(Rhi_mn, Rm, Rn);
mul(Rlo_mn, Rm, Rn);
ldr(Rm, pre(Pm, wordSize));
ldr(Rn, pre(Pn, -wordSize));
}
void post1_squaring() {
acc(Rhi_mn, Rlo_mn, t0, t1, t2); // The pending m*n
// *Pm = Rm = t0 * inv;
mul(Rm, t0, inv);
str(Rm, Address(Pm));
// MACC(Rm, Rn, t0, t1, t2);
// t0 = t1; t1 = t2; t2 = 0;
umulh(Rhi_mn, Rm, Rn);
#ifndef PRODUCT
// assert(m[i] * n[0] + t0 == 0, "broken Montgomery multiply");
{
mul(Rlo_mn, Rm, Rn);
add(Rlo_mn, t0, Rlo_mn);
Label ok;
cbz(Rlo_mn, ok); {
stop("broken Montgomery multiply");
} bind(ok);
}
#endif
// We have very carefully set things up so that
// m[i]*n[0] + t0 == 0 (mod b), so we don't have to calculate
// the lower half of Rm * Rn because we know the result already:
// it must be -t0. t0 + (-t0) must generate a carry iff
// t0 != 0. So, rather than do a mul and an adds we just set
// the carry flag iff t0 is nonzero.
//
// mul(Rlo_mn, Rm, Rn);
// adds(zr, t0, Rlo_mn);
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