1dnl x86 pentium time stamp counter access routine. 2 3dnl Copyright 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc. 4dnl 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 8dnl modify it under the terms of the GNU Lesser General Public License as 9dnl published by the Free Software Foundation; either version 3 of the 10dnl License, or (at your option) any later version. 11dnl 12dnl The GNU MP Library is distributed in the hope that it will be useful, 13dnl but WITHOUT ANY WARRANTY; without even the implied warranty of 14dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15dnl Lesser General Public License for more details. 16dnl 17dnl You should have received a copy of the GNU Lesser General Public License 18dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 19 20 21include(`../config.m4') 22 23 24C void speed_cyclecounter (unsigned p[2]); 25C 26C Get the pentium rdtsc cycle counter, storing the least significant word in 27C p[0] and the most significant in p[1]. 28C 29C cpuid is used to serialize execution. On big measurements this won't be 30C significant but it may help make small single measurements more accurate. 31 32PROLOGUE(speed_cyclecounter) 33 34 C rdi p 35 36 movq %rbx, %r10 37 xorl %eax, %eax 38 cpuid 39 rdtsc 40 movl %eax, (%rdi) 41 movl %edx, 4(%rdi) 42 movq %r10, %rbx 43 ret 44EPILOGUE() 45