| dnl x86 pentium time stamp counter access routine. |
| |
| dnl Copyright 1999, 2000, 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. |
| |
| .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() |