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| 1 | /* High precision, low overhead timing functions. powerpc64 version. |
|---|---|
| 2 | Copyright (C) 2005-2024 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 |
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