| Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame] | 1 | dnl x86 pentium time stamp counter access routine. |
| 2 | |
| 3 | dnl Copyright 1999, 2000, 2005 Free Software Foundation, Inc. |
| 4 | |
| 5 | dnl This file is part of the GNU MP Library. |
| 6 | dnl |
| 7 | dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| 8 | dnl it under the terms of either: |
| 9 | dnl |
| 10 | dnl * the GNU Lesser General Public License as published by the Free |
| 11 | dnl Software Foundation; either version 3 of the License, or (at your |
| 12 | dnl option) any later version. |
| 13 | dnl |
| 14 | dnl or |
| 15 | dnl |
| 16 | dnl * the GNU General Public License as published by the Free Software |
| 17 | dnl Foundation; either version 2 of the License, or (at your option) any |
| 18 | dnl later version. |
| 19 | dnl |
| 20 | dnl or both in parallel, as here. |
| 21 | dnl |
| 22 | dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| 23 | dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 24 | dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 25 | dnl for more details. |
| 26 | dnl |
| 27 | dnl You should have received copies of the GNU General Public License and the |
| 28 | dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| 29 | dnl see https://www.gnu.org/licenses/. |
| 30 | |
| 31 | |
| 32 | include(`../config.m4') |
| 33 | |
| 34 | |
| 35 | C void speed_cyclecounter (unsigned p[2]); |
| 36 | C |
| 37 | C Get the pentium rdtsc cycle counter, storing the least significant word in |
| 38 | C p[0] and the most significant in p[1]. |
| 39 | C |
| 40 | C cpuid is used to serialize execution. On big measurements this won't be |
| 41 | C significant but it may help make small single measurements more accurate. |
| 42 | |
| 43 | .text |
| 44 | ALIGN(8) |
| 45 | |
| 46 | defframe(PARAM_P,4) |
| 47 | |
| 48 | PROLOGUE(speed_cyclecounter) |
| 49 | deflit(`FRAME',0) |
| 50 | pushl %ebx |
| 51 | FRAME_pushl() |
| 52 | xorl %eax, %eax |
| 53 | cpuid |
| 54 | rdtsc |
| 55 | movl PARAM_P, %ebx |
| 56 | movl %eax, (%ebx) |
| 57 | movl %edx, 4(%ebx) |
| 58 | popl %ebx |
| 59 | ret |
| 60 | EPILOGUE() |