47 lines
1.5 KiB
NASM
47 lines
1.5 KiB
NASM
dnl x86 pentium time stamp counter access routine.
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dnl Copyright 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C void speed_cyclecounter (unsigned p[2]);
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C
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C Get the pentium rdtsc cycle counter, storing the least significant word in
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C p[0] and the most significant in p[1].
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C
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C cpuid is used to serialize execution. On big measurements this won't be
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C significant but it may help make small single measurements more accurate.
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PROLOGUE(speed_cyclecounter)
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C rdi p
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movq %rbx, %r10
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xorl %eax, %eax
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cpuid
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rdtsc
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movl %eax, (%rdi)
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movl %edx, 4(%rdi)
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movq %r10, %rbx
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ret
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EPILOGUE()
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