| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* High precision, low overhead timing functions. Generic version. |
| 2 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
| 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 | /* In case a platform supports timers in the hardware the following macros |
| 21 | and types must be defined: |
| 22 | |
| 23 | - HP_TIMING_AVAIL: test for availability. |
| 24 | |
| 25 | - HP_TIMING_INLINE: this macro is non-zero if the functionality is not |
| 26 | implemented using function calls but instead uses some inlined code |
| 27 | which might simply consist of a few assembler instructions. We have to |
| 28 | know this since we might want to use the macros here in places where we |
| 29 | cannot make function calls. |
| 30 | |
| 31 | - hp_timing_t: This is the type for variables used to store the time |
| 32 | values. This type must be integral. |
| 33 | |
| 34 | - HP_TIMING_NOW: place timestamp for current time in variable given as |
| 35 | parameter. |
| 36 | */ |
| 37 | |
| 38 | /* The target supports hp-timing. Share the common infrastructure. */ |
| 39 | |
| 40 | #include <string.h> |
| 41 | #include <sys/param.h> |
| 42 | #include <_itoa.h> |
| 43 | |
| 44 | /* Compute the difference between START and END, storing into DIFF. */ |
| 45 | #define HP_TIMING_DIFF(Diff, Start, End) ((Diff) = (End) - (Start)) |
| 46 | |
| 47 | /* Accumulate ADD into SUM. No attempt is made to be thread-safe. */ |
| 48 | #define HP_TIMING_ACCUM_NT(Sum, Diff) ((Sum) += (Diff)) |
| 49 | |
| 50 | /* Write a decimal representation of the timing value into the given string. */ |
| 51 | #define HP_TIMING_PRINT(Dest, Len, Val) \ |
| 52 | do { \ |
| 53 | char __buf[20]; \ |
| 54 | char *__dest = (Dest); \ |
| 55 | size_t __len = (Len); \ |
| 56 | char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0); \ |
| 57 | size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len); \ |
| 58 | memcpy (__dest, __cp, __cp_len); \ |
| 59 | memcpy (__dest + __cp_len, " cycles", \ |
| 60 | MIN (__len - __cp_len, sizeof (" cycles"))); \ |
| 61 | __dest[__len - 1] = '\0'; \ |
| 62 | } while (0) |