1 /* High precision, low overhead timing functions. powerpc64 version. 2 Copyright (C) 2005-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _HP_TIMING_H 20 #define _HP_TIMING_H 1 21 22 /* We indeed have inlined functions. */ 23 #define HP_TIMING_INLINE (1) 24 25 /* We use 64bit values for the times. */ 26 typedef unsigned long long int hp_timing_t; 27 28 /* That's quite simple. Use the `mftb' instruction. Note that the value 29 might not be 100% accurate since there might be some more instructions 30 running in this moment. This could be changed by using a barrier like 31 'lwsync' right before the `mftb' instruction. But we are not interested 32 in accurate clock cycles here so we don't do this. */ 33 34 #define HP_TIMING_NOW(Var) \ 35 do { \ 36 unsigned int hi, lo, tmp; \ 37 __asm__ __volatile__ ("1: mfspr %0,269;" \ 38 " mfspr %1,268;" \ 39 " mfspr %2,269;" \ 40 " cmpw %0,%2;" \ 41 " bne 1b;" \ 42 : "=&r" (hi), "=&r" (lo), "=&r" (tmp) \ 43 : : "cr0"); \ 44 Var = ((hp_timing_t) hi << 32) | lo; \ 45 } while (0) 46 47 #include <hp-timing-common.h> 48 49 #endif /* hp-timing.h */ 50