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afe23eb0f1
Some benchmarks with a very short runtime show significantly different results across runs on Aarch64 - up to tens of percents. Increasing the runtime to 100ms+ makes the deviation under 5%. Tested on Aarch64 and x86-64. Reviewed-by: Carlos O'Donell <carlos@redhat.com> * benchtests/bench-memccpy.c: Replace INNER_LOOP_ITERS with INNER_LOOP_ITERS_LARGE. * benchtests/bench-memchr.c: Likewise. * benchtests/bench-rawmemchr.c: Likewise. * benchtests/bench-strcat.c: Likewise. * benchtests/bench-strchr.c: Likewise. * benchtests/bench-string.h: Likewise. * benchtests/bench-strlen.c: Likewise. * benchtests/bench-strncpy.c: Likewise. * benchtests/bench-strnlen.c: Likewise.
158 lines
3.5 KiB
C
158 lines
3.5 KiB
C
/* Measure strlen functions.
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Copyright (C) 2013-2019 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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<http://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#ifndef WIDE
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# define TEST_NAME "strnlen"
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#else
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# define TEST_NAME "wcsnlen"
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# define generic_strnlen generic_wcsnlen
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# define memchr_strnlen wcschr_wcsnlen
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#endif /* WIDE */
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#include "bench-string.h"
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#define BIG_CHAR MAX_CHAR
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#ifndef WIDE
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# define MIDDLE_CHAR 127
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#else
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# define MIDDLE_CHAR 1121
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#endif /* WIDE */
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typedef size_t (*proto_t) (const CHAR *, size_t);
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size_t generic_strnlen (const CHAR *, size_t);
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size_t
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memchr_strnlen (const CHAR *s, size_t maxlen)
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{
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const CHAR *s1 = MEMCHR (s, 0, maxlen);
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return (s1 == NULL) ? maxlen : s1 - s;
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}
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IMPL (STRNLEN, 1)
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IMPL (memchr_strnlen, 0)
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IMPL (generic_strnlen, 0)
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static void
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do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)
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{
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size_t len = CALL (impl, s, maxlen), i, iters = INNER_LOOP_ITERS_LARGE;
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timing_t start, stop, cur;
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if (len != exp_len)
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{
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error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
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len, exp_len);
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ret = 1;
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return;
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}
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TIMING_NOW (start);
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for (i = 0; i < iters; ++i)
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{
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CALL (impl, s, maxlen);
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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TIMING_PRINT_MEAN ((double) cur, (double) iters);
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}
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static void
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do_test (size_t align, size_t len, size_t maxlen, int max_char)
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{
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size_t i;
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align &= 63;
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if ((align + len) * sizeof (CHAR) >= page_size)
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return;
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CHAR *buf = (CHAR *) (buf1);
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for (i = 0; i < len; ++i)
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buf[align + i] = 1 + 7 * i % max_char;
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buf[align + len] = 0;
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printf ("Length %4zd, alignment %2zd:", len, align);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
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putchar ('\n');
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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printf ("%20s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (i = 1; i < 8; ++i)
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{
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do_test (0, i, i - 1, MIDDLE_CHAR);
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do_test (0, i, i, MIDDLE_CHAR);
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do_test (0, i, i + 1, MIDDLE_CHAR);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (i, i, i - 1, MIDDLE_CHAR);
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do_test (i, i, i, MIDDLE_CHAR);
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do_test (i, i, i + 1, MIDDLE_CHAR);
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}
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for (i = 2; i <= 10; ++i)
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{
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do_test (0, 1 << i, 5000, MIDDLE_CHAR);
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do_test (1, 1 << i, 5000, MIDDLE_CHAR);
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}
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for (i = 1; i < 8; ++i)
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do_test (0, i, 5000, BIG_CHAR);
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for (i = 1; i < 8; ++i)
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do_test (i, i, 5000, BIG_CHAR);
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for (i = 2; i <= 10; ++i)
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{
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do_test (0, 1 << i, 5000, BIG_CHAR);
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do_test (1, 1 << i, 5000, BIG_CHAR);
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}
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return ret;
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}
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#include <support/test-driver.c>
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#define libc_hidden_def(X)
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#ifndef WIDE
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# undef STRNLEN
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# define STRNLEN generic_strnlen
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# include <string/strnlen.c>
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#else
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# define WCSNLEN generic_strnlen
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# include <wcsmbs/wcsnlen.c>
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#endif
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