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benchtests/bench-util.h
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
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/* Benchmark utility functions. Copyright (C) 2015-2026 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* Prevent compiler to optimize away call. */ #define DO_NOT_OPTIMIZE_OUT(value) \ ({ \ __typeof (value) __v = (value); \ asm volatile ("" : : "r,m" (__v) : "memory"); \ __v; \ }) #if __GNUC_PREREQ (4, 4) || __glibc_has_attribute (__optimize__) # define attribute_optimize(level) __attribute__ ((optimize (level))) #else # define attribute_optimize(level) #endif #ifndef START_ITER # define START_ITER (100000000) #endif /* bench_start reduces the random variations due to frequency scaling by executing a small loop with many memory accesses. START_ITER controls the number of iterations. */ void bench_start (void);