| 1 | /* Benchmark utility functions. |
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| 2 | Copyright (C) 2015-2024 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 | /* Prevent compiler to optimize away call. */ |
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| 20 | #define DO_NOT_OPTIMIZE_OUT(value) \ |
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| 21 | ({ \ |
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| 22 | __typeof (value) __v = (value); \ |
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| 23 | asm volatile ("" : : "r,m" (__v) : "memory"); \ |
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| 24 | __v; \ |
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| 25 | }) |
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| 26 | |
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| 27 | #ifndef START_ITER |
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| 28 | # define START_ITER (100000000) |
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| 29 | #endif |
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| 30 | |
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| 31 | /* bench_start reduces the random variations due to frequency scaling by |
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| 32 | executing a small loop with many memory accesses. START_ITER controls |
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| 33 | the number of iterations. */ |
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| 34 | |
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| 35 | void bench_start (void); |
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| 36 | |
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