lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* High precision, low overhead timing functions. Alpha version. |
| 2 | Copyright (C) 2001-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Richard Henderson <rth@redhat.com>, 2001. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library. If not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #ifndef _HP_TIMING_H |
| 21 | #define _HP_TIMING_H 1 |
| 22 | |
| 23 | /* We always have the timestamp register, but it's got only a 4 second |
| 24 | range. Use it for ld.so profiling only. */ |
| 25 | #define HP_TIMING_AVAIL (0) |
| 26 | #define HP_SMALL_TIMING_AVAIL (1) |
| 27 | |
| 28 | /* We indeed have inlined functions. */ |
| 29 | #define HP_TIMING_INLINE (1) |
| 30 | |
| 31 | /* We use 32 bit values for the times. */ |
| 32 | typedef unsigned int hp_timing_t; |
| 33 | |
| 34 | /* The "rpcc" instruction returns a 32-bit counting half and a 32-bit |
| 35 | "virtual cycle counter displacement". Subtracting the two gives us |
| 36 | a virtual cycle count. */ |
| 37 | #define HP_TIMING_NOW(VAR) \ |
| 38 | do { \ |
| 39 | unsigned long int x_; \ |
| 40 | asm volatile ("rpcc %0" : "=r"(x_)); \ |
| 41 | (VAR) = (int) (x_) - (int) (x_ >> 32); \ |
| 42 | } while (0) |
| 43 | |
| 44 | #include <hp-timing-common.h> |
| 45 | |
| 46 | #endif /* hp-timing.h */ |