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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 2.1 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
dnl License along with the GNU MP Library; see the file COPYING.LIB. If
dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
dnl Fifth Floor, Boston, MA 02110-1301, USA.
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()
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