JDK14/Java14源码在线阅读
/*
* Copyright (c) 2003, 2019, Oracle and/or its affiliates. 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.
*
*/
#ifndef OS_CPU_LINUX_X86_COPY_LINUX_X86_INLINE_HPP
#define OS_CPU_LINUX_X86_COPY_LINUX_X86_INLINE_HPP
static void pd_conjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
#ifdef AMD64
(void)memmove(to, from, count * HeapWordSize);
#else
// Includes a zero-count check.
intx temp = 0;
__asm__ volatile(" testl %6,%6 ;"
" jz 7f ;"
" cmpl %4,%5 ;"
" leal -4(%4,%6,4),%3;"
" jbe 1f ;"
" cmpl %7,%5 ;"
" jbe 4f ;"
"1: cmpl $32,%6 ;"
" ja 3f ;"
" subl %4,%1 ;"
"2: movl (%4),%3 ;"
" movl %7,(%5,%4,1) ;"
" addl $4,%0 ;"
" subl $1,%2 ;"
" jnz 2b ;"
" jmp 7f ;"
"3: rep; smovl ;"
" jmp 7f ;"
"4: cmpl $32,%2 ;"
" movl %7,%0 ;"
" leal -4(%5,%6,4),%1;"
" ja 6f ;"
" subl %4,%1 ;"
"5: movl (%4),%3 ;"
" movl %7,(%5,%4,1) ;"
" subl $4,%0 ;"
" subl $1,%2 ;"
" jnz 5b ;"
" jmp 7f ;"
"6: std ;"
" rep; smovl ;"
" cld ;"
"7: nop "
: "=S" (from), "=D" (to), "=c" (count), "=r" (temp)
: "0" (from), "1" (to), "2" (count), "3" (temp)
: "memory", "flags");
#endif // AMD64
}
static void pd_disjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
#ifdef AMD64
switch (count) {
case 8: to[7] = from[7];
case 7: to[6] = from[6];
case 6: to[5] = from[5];
case 5: to[4] = from[4];
case 4: to[3] = from[3];
case 3: to[2] = from[2];
case 2: to[1] = from[1];
case 1: to[0] = from[0];
case 0: break;
default:
(void)memcpy(to, from, count * HeapWordSize);
break;
}
#else
// Includes a zero-count check.
intx temp = 0;
__asm__ volatile(" testl %6,%6 ;"
" jz 3f ;"
" cmpl $32,%6 ;"
" ja 2f ;"
" subl %4,%1 ;"
"1: movl (%4),%3 ;"
" movl %7,(%5,%4,1);"
" addl $4,%0 ;"
" subl $1,%2 ;"
" jnz 1b ;"
" jmp 3f ;"
"2: rep; smovl ;"
"3: nop "
: "=S" (from), "=D" (to), "=c" (count), "=r" (temp)
: "0" (from), "1" (to), "2" (count), "3" (temp)
: "memory", "cc");
#endif // AMD64
}
static void pd_disjoint_words_atomic(const HeapWord* from, HeapWord* to, size_t count) {
#ifdef AMD64
switch (count) {
case 8: to[7] = from[7];
case 7: to[6] = from[6];
case 6: to[5] = from[5];
case 5: to[4] = from[4];
case 4: to[3] = from[3];
case 3: to[2] = from[2];
case 2: to[1] = from[1];
case 1: to[0] = from[0];
case 0: break;
default:
while (count-- > 0) {
*to++ = *from++;
}
break;
}
#else
// pd_disjoint_words is word-atomic in this implementation.
pd_disjoint_words(from, to, count);
#endif // AMD64
}
static void pd_aligned_conjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
pd_conjoint_words(from, to, count);
}
static void pd_aligned_disjoint_words(const HeapWord* from, HeapWord* to, size_t count) {
pd_disjoint_words(from, to, count);
}
static void pd_conjoint_bytes(const void* from, void* to, size_t count) {
#ifdef AMD64
(void)memmove(to, from, count);
#else
// Includes a zero-count check.
intx temp = 0;
__asm__ volatile(" testl %6,%6 ;"
" jz 13f ;"
" cmpl %4,%5 ;"
" leal -1(%4,%6),%3 ;"
" jbe 1f ;"
" cmpl %7,%5 ;"
" jbe 8f ;"
"1: cmpl $3,%6 ;"
" jbe 6f ;"
" movl %6,%3 ;"
" movl $4,%2 ;"
" subl %4,%2 ;"
" andl $3,%2 ;"
" jz 2f ;"
" subl %6,%3 ;"
" rep; smovb ;"
"2: movl %7,%2 ;"
" shrl $2,%2 ;"
" jz 5f ;"
" cmpl $32,%2 ;"
" ja 4f ;"
" subl %4,%1 ;"
"3: movl (%4),%%edx ;"
" movl %%edx,(%5,%4,1);"
" addl $4,%0 ;"
" subl $1,%2 ;"
" jnz 3b ;"
" addl %4,%1 ;"
" jmp 5f ;"
"4: rep; smovl ;"
"5: movl %7,%2 ;"
" andl $3,%2 ;"
" jz 13f ;"
"6: xorl %7,%3 ;"
"7: movb (%4,%7,1),%%dl ;"
" movb %%dl,(%5,%7,1) ;"
" addl $1,%3 ;"
" subl $1,%2 ;"
" jnz 7b ;"
" jmp 13f ;"
"8: std ;"
" cmpl $12,%2 ;"
" ja 9f ;"
" movl %7,%0 ;"
" leal -1(%6,%5),%1 ;"
" jmp 11f ;"
"9: xchgl %3,%2 ;"
" movl %6,%0 ;"
" addl $1,%2 ;"
" leal -1(%7,%5),%1 ;"
" andl $3,%2 ;"
" jz 10f ;"
" subl %6,%3 ;"
" rep; smovb ;"
"10: movl %7,%2 ;"
" subl $3,%0 ;"
" shrl $2,%2 ;"
" subl $3,%1 ;"
" rep; smovl ;"
" andl $3,%3 ;"
" jz 12f ;"
" movl %7,%2 ;"
" addl $3,%0 ;"
" addl $3,%1 ;"
"11: rep; smovb ;"
"12: cld ;"
"13: nop ;"
: "=S" (from), "=D" (to), "=c" (count), "=r" (temp)
: "0" (from), "1" (to), "2" (count), "3" (temp)
: "memory", "flags", "%edx");
#endif // AMD64
}
static void pd_conjoint_bytes_atomic(const void* from, void* to, size_t count) {
pd_conjoint_bytes(from, to, count);
}
static void pd_conjoint_jshorts_atomic(const jshort* from, jshort* to, size_t count) {
_Copy_conjoint_jshorts_atomic(from, to, count);
}
static void pd_conjoint_jints_atomic(const jint* from, jint* to, size_t count) {
#ifdef AMD64
_Copy_conjoint_jints_atomic(from, to, count);
#else
assert(HeapWordSize == BytesPerInt, "heapwords and jints must be the same size");
// pd_conjoint_words is word-atomic in this implementation.
pd_conjoint_words((const HeapWord*)from, (HeapWord*)to, count);
#endif // AMD64
}
static void pd_conjoint_jlongs_atomic(const jlong* from, jlong* to, size_t count) {
#ifdef AMD64
_Copy_conjoint_jlongs_atomic(from, to, count);
#else
// Guarantee use of fild/fistp or xmm regs via some asm code, because compilers won't.
if (from > to) {
while (count-- > 0) {
__asm__ volatile("fildll (%0); fistpll (%1)"
:
: "r" (from), "r" (to)
: "memory" );
++from;
++to;
}
} else {
while (count-- > 0) {
__asm__ volatile("fildll (%0,%2,8); fistpll (%1,%2,8)"
:
: "r" (from), "r" (to), "r" (count)
: "memory" );
}
}
#endif // AMD64
}
static void pd_conjoint_oops_atomic(const oop* from, oop* to, size_t count) {
#ifdef AMD64
assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");
_Copy_conjoint_jlongs_atomic((const jlong*)from, (jlong*)to, count);
#else
assert(HeapWordSize == BytesPerOop, "heapwords and oops must be the same size");
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