1dnl x86 pentium time stamp counter access routine. 2 3dnl Copyright 1999, 2000, 2003-2005 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31 32include(`../config.m4') 33 34 35C void speed_cyclecounter (unsigned p[2]); 36C 37C Get the pentium rdtsc cycle counter, storing the least significant word in 38C p[0] and the most significant in p[1]. 39C 40C cpuid is used to serialize execution. On big measurements this won't be 41C significant but it may help make small single measurements more accurate. 42 43PROLOGUE(speed_cyclecounter) 44 45 C rdi p 46 47 movq %rbx, %r10 48 xorl %eax, %eax 49 cpuid 50 rdtsc 51 movl %eax, (%rdi) 52 movl %edx, 4(%rdi) 53 movq %r10, %rbx 54 ret 55EPILOGUE() 56