JDK14/Java14源码在线阅读

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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef CPU_X86_C1_DEFS_X86_HPP
#define CPU_X86_C1_DEFS_X86_HPP

// native word offsets from memory address (little endian)
enum {
  pd_lo_word_offset_in_bytes = 0,
  pd_hi_word_offset_in_bytes = BytesPerWord
};

// explicit rounding operations are required to implement the strictFP mode
enum {
  pd_strict_fp_requires_explicit_rounding = true
};


// registers
enum {
  pd_nof_cpu_regs_frame_map = RegisterImpl::number_of_registers,       // number of registers used during code emission
  pd_nof_fpu_regs_frame_map = FloatRegisterImpl::number_of_registers,  // number of registers used during code emission
  pd_nof_xmm_regs_frame_map = XMMRegisterImpl::number_of_registers,    // number of registers used during code emission

#ifdef _LP64
  #define UNALLOCATED 4    // rsp, rbp, r15, r10
#else
  #define UNALLOCATED 2    // rsp, rbp
#endif // LP64

  pd_nof_caller_save_cpu_regs_frame_map = pd_nof_cpu_regs_frame_map - UNALLOCATED,  // number of registers killed by calls
  pd_nof_caller_save_fpu_regs_frame_map = pd_nof_fpu_regs_frame_map,  // number of registers killed by calls
  pd_nof_caller_save_xmm_regs_frame_map = pd_nof_xmm_regs_frame_map,  // number of registers killed by calls

  pd_nof_cpu_regs_reg_alloc = pd_nof_caller_save_cpu_regs_frame_map,  // number of registers that are visible to register allocator
  pd_nof_fpu_regs_reg_alloc = 6,  // number of registers that are visible to register allocator

  pd_nof_cpu_regs_linearscan = pd_nof_cpu_regs_frame_map, // number of registers visible to linear scan
  pd_nof_fpu_regs_linearscan = pd_nof_fpu_regs_frame_map, // number of registers visible to linear scan
  pd_nof_xmm_regs_linearscan = pd_nof_xmm_regs_frame_map, // number of registers visible to linear scan
  pd_first_cpu_reg = 0,
  pd_last_cpu_reg = NOT_LP64(5) LP64_ONLY(11),
  pd_first_byte_reg = NOT_LP64(2) LP64_ONLY(0),
  pd_last_byte_reg = NOT_LP64(5) LP64_ONLY(11),

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