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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.
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/* Measure memchr 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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#include <assert.h>
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#include <stdint.h>
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#define TEST_MAIN
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#define TEST_NAME "rawmemchr"
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#include "bench-string.h"
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typedef char *(*proto_t) (const char *, int);
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char *
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generic_rawmemchr (const char *s, int c)
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{
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if (c != 0)
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return memchr (s, c, PTRDIFF_MAX);
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return (char *)s + strlen (s);
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}
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IMPL (rawmemchr, 1)
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IMPL (generic_rawmemchr, 0)
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static void
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do_one_test (impl_t *impl, const char *s, int c, char *exp_res)
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{
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size_t i, iters = INNER_LOOP_ITERS_LARGE;
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timing_t start, stop, cur;
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char *res = CALL (impl, s, c);
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if (res != exp_res)
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{
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error (0, 0, "Wrong result in function %s %p %p", impl->name,
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res, exp_res);
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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, c);
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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 pos, size_t len, int seek_char)
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{
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size_t i;
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char *result;
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align &= 7;
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if (align + len >= page_size)
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return;
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for (i = 0; i < len; ++i)
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{
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buf1[align + i] = 1 + 23 * i % 127;
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if (buf1[align + i] == seek_char)
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buf1[align + i] = seek_char + 1;
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}
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buf1[align + len] = 0;
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assert (pos < len);
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buf1[align + pos] = seek_char;
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buf1[align + len] = -seek_char;
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result = (char *) (buf1 + align + pos);
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printf ("Length %4zd, alignment %2zd:", pos, align);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (char *) (buf1 + align), seek_char, result);
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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 < 7; ++i)
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{
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do_test (0, 16 << i, 2048, 23);
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do_test (i, 64, 256, 23);
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do_test (0, 16 << i, 2048, 0);
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do_test (i, 64, 256, 0);
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}
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for (i = 1; i < 32; ++i)
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{
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do_test (0, i, i + 1, 23);
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do_test (0, i, i + 1, 0);
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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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