dnl x86 pentium
time stamp counter access routine.
dnl Copyright 1999, 2000, 2005 Free Software Foundation,
Inc.
dnl
This file is part of the GNU MP Library.
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; you can redistribute it and/or modify
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Public License as published by the Free
dnl Software Foundation
; either version 3 of the License, or (at your
dnl
option) any later
version.
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dnl
or
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dnl * the GNU General
Public License as published by the Free Software
dnl Foundation
; either version 2 of the License, or (at your option) any
dnl later
version.
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or both in parallel, as here.
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or FITNESS
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Public License
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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.
.text
ALIGN(8)
defframe(PARAM_P,4)
PROLOGUE(speed_cyclecounter)
deflit(`FRAME
',0)
pushl %ebx
FRAME_pushl()
xorl %
eax, %
eax
cpuid
rdtsc
movl PARAM_P, %ebx
movl %
eax, (%ebx)
movl %
edx, 4(%ebx)
popl %ebx
ret
EPILOGUE()
