| 1 | /* High precision, low overhead timing functions. Generic version. |
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| 2 | Copyright (C) 1998-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* In case a platform supports timers in the hardware the following macros |
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| 20 | and types must be defined: |
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| 21 | |
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| 22 | - HP_TIMING_INLINE: this macro is non-zero if the functionality is not |
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| 23 | implemented using function calls but instead uses some inlined code |
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| 24 | which might simply consist of a few assembler instructions. We have to |
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| 25 | know this since we might want to use the macros here in places where we |
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| 26 | cannot make function calls. |
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| 27 | |
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| 28 | - hp_timing_t: This is the type for variables used to store the time |
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| 29 | values. This type must be integral. |
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| 30 | |
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| 31 | - HP_TIMING_NOW: place timestamp for current time in variable given as |
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| 32 | parameter. |
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| 33 | */ |
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| 34 | |
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| 35 | /* The target supports hp-timing. Share the common infrastructure. */ |
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| 36 | |
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| 37 | #include <string.h> |
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| 38 | #include <sys/param.h> |
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| 39 | #include <_itoa.h> |
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| 40 | |
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| 41 | /* Compute the difference between START and END, storing into DIFF. */ |
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| 42 | #define HP_TIMING_DIFF(Diff, Start, End) ((Diff) = (End) - (Start)) |
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| 43 | |
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| 44 | /* Accumulate ADD into SUM. No attempt is made to be thread-safe. */ |
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| 45 | #define HP_TIMING_ACCUM_NT(Sum, Diff) ((Sum) += (Diff)) |
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| 46 | |
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| 47 | #define HP_TIMING_PRINT_SIZE (3 * sizeof (hp_timing_t) + 1) |
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| 48 | |
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| 49 | /* Write a decimal representation of the timing value into the given string. */ |
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| 50 | #define HP_TIMING_PRINT(Dest, Len, Val) \ |
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| 51 | do { \ |
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| 52 | char __buf[HP_TIMING_PRINT_SIZE]; \ |
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| 53 | char *__dest = (Dest); \ |
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| 54 | size_t __len = (Len); \ |
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| 55 | char *__cp = _itoa ((Val), __buf + sizeof (__buf), 10, 0); \ |
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| 56 | size_t __cp_len = MIN (__buf + sizeof (__buf) - __cp, __len); \ |
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| 57 | memcpy (__dest, __cp, __cp_len); \ |
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| 58 | __dest[__cp_len - 1] = '\0'; \ |
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| 59 | } while (0) |
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| 60 | |
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