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 #ifdef _ARCH_PWR4 34 #define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mfspr %0,268" : "=r" (Var)) 35 #else 36 #define HP_TIMING_NOW(Var) __asm__ __volatile__ ("mftb %0" : "=r" (Var)) 37 #endif 38 39 #include <hp-timing-common.h> 40 41 #endif /* hp-timing.h */ 42