x86_64.asm
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上传日期:2022-08-06
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- dnl x86 pentium time stamp counter access routine.
- dnl Copyright 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
- dnl
- dnl This file is part of the GNU MP Library.
- dnl
- dnl The GNU MP Library is free software; you can redistribute it and/or
- dnl modify it under the terms of the GNU Lesser General Public License as
- dnl published by the Free Software Foundation; either version 3 of the
- dnl License, or (at your option) any later version.
- dnl
- dnl The GNU MP Library is distributed in the hope that it will be useful,
- dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
- dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- dnl Lesser General Public License for more details.
- dnl
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C void speed_cyclecounter (unsigned p[2]);
- C
- C Get the pentium rdtsc cycle counter, storing the least significant word in
- C p[0] and the most significant in p[1].
- C
- C cpuid is used to serialize execution. On big measurements this won't be
- C significant but it may help make small single measurements more accurate.
- PROLOGUE(speed_cyclecounter)
- C rdi p
- movq %rbx, %r10
- xorl %eax, %eax
- cpuid
- rdtsc
- movl %eax, (%rdi)
- movl %edx, 4(%rdi)
- movq %r10, %rbx
- ret
- EPILOGUE()