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88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* Actual benchmark kernels used by bench-hash-funcs.h
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Copyright (C) 2022-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include "bench-util.h"
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/* We go through the trouble of using macros here because many of the
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hash functions are meant to be inlined so its not fair to benchmark
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them with a function pointer where they won't be inlinable. */
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#undef RUN_FUNC
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#undef POSTFIX
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#ifdef SIMPLE
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# define RUN_FUNC SIMPLE_TEST_FUNC
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# define POSTFIX _simple
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#else
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# define RUN_FUNC TEST_FUNC
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# define POSTFIX _optimized
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#endif
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#define PRIMITIVE_CAT(x, y) x ## y
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#define CAT(x, y) PRIMITIVE_CAT (x, y)
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static double __attribute_optimization_barrier__
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CAT (do_one_test_kernel, POSTFIX) (const char *s, size_t len)
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{
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unsigned int iters;
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timing_t start, stop, cur;
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/* Warmup. */
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for (iters = NFIXED_ITERS / 32; iters; --iters)
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DO_NOT_OPTIMIZE_OUT (RUN_FUNC (s, len));
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TIMING_NOW (start);
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for (iters = NFIXED_ITERS; iters; --iters)
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DO_NOT_OPTIMIZE_OUT (RUN_FUNC (s, len));
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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(void) (len);
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return (double) cur / (double) NFIXED_ITERS;
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}
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static double __attribute_optimization_barrier__
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CAT (do_rand_test_kernel, POSTFIX) (char const *bufs,
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unsigned int const *sizes)
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{
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unsigned int i, iters;
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size_t offset;
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timing_t start, stop, cur;
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/* Warmup. */
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for (i = 0, offset = 0; i < NRAND_BUFS; ++i, offset += RAND_BENCH_MAX_LEN)
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DO_NOT_OPTIMIZE_OUT (RUN_FUNC (bufs + offset, sizes[i]));
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TIMING_NOW (start);
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for (iters = NRAND_ITERS; iters; --iters)
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{
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for (i = 0, offset = 0; i < NRAND_BUFS;
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++i, offset += RAND_BENCH_MAX_LEN)
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DO_NOT_OPTIMIZE_OUT (RUN_FUNC (bufs + offset, sizes[i]));
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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(void) (sizes);
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return (double) cur / (double) (NRAND_ITERS * NRAND_BUFS);
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}
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