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git://sourceware.org/git/glibc.git
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643a2d0139
1. Add more complete coverage in the medium size range. 2. In strnlen remove the `1 << i` which was UB (`i` could go beyond 32/64)
253 lines
7.0 KiB
C
253 lines
7.0 KiB
C
/* Measure memchr functions.
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Copyright (C) 2013-2022 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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#ifndef WIDE
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# define SMALL_CHAR 127
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#else
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# define SMALL_CHAR 1273
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#endif /* WIDE */
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#ifndef USE_AS_MEMRCHR
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# define TEST_MAIN
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# ifndef WIDE
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# define TEST_NAME "memchr"
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# else
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# define TEST_NAME "wmemchr"
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# endif /* WIDE */
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# include "bench-string.h"
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# ifndef WIDE
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# define SIMPLE_MEMCHR simple_memchr
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# else
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# define SIMPLE_MEMCHR simple_wmemchr
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# endif /* WIDE */
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typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
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CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);
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IMPL (SIMPLE_MEMCHR, 0)
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IMPL (MEMCHR, 1)
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CHAR *
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SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
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{
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while (n--)
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if (*s++ == (CHAR) c)
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return (CHAR *) s - 1;
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return NULL;
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}
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#endif /* !USE_AS_MEMRCHR */
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#include "json-lib.h"
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static void
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do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, int c,
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size_t n)
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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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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, n);
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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json_element_double (json_ctx, (double) cur / (double) iters);
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}
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static void
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do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len,
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int seek_char, int invert_pos)
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{
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size_t i;
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align &= getpagesize () - 1;
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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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{
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buf[align + i] = 1 + 23 * i % SMALL_CHAR;
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if (buf[align + i] == seek_char)
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buf[align + i] = seek_char + 1;
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}
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buf[align + len] = 0;
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if (pos < len)
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{
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if (invert_pos)
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buf[align + len - pos] = seek_char;
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else
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buf[align + pos] = seek_char;
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buf[align + len] = -seek_char;
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}
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else
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{
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buf[align + len] = seek_char;
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}
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "align", align);
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json_attr_uint (json_ctx, "pos", pos);
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json_attr_uint (json_ctx, "len", len);
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json_attr_uint (json_ctx, "seek_char", seek_char);
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json_attr_uint (json_ctx, "invert_pos", invert_pos);
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json_array_begin (json_ctx, "timings");
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FOR_EACH_IMPL (impl, 0)
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do_one_test (json_ctx, impl, (CHAR *) (buf + align), seek_char, len);
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json_array_end (json_ctx);
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json_element_object_end (json_ctx);
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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, j, al, al_max;
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int repeats;
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json_ctx_t json_ctx;
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test_init ();
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json_init (&json_ctx, 0, stdout);
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json_document_begin (&json_ctx);
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json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
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json_attr_object_begin (&json_ctx, "functions");
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json_attr_object_begin (&json_ctx, TEST_NAME);
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json_attr_string (&json_ctx, "bench-variant", "");
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json_array_begin (&json_ctx, "ifuncs");
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FOR_EACH_IMPL (impl, 0)
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json_element_string (&json_ctx, impl->name);
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json_array_end (&json_ctx);
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json_array_begin (&json_ctx, "results");
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al_max = 0;
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#ifdef USE_AS_MEMRCHR
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al_max = getpagesize () / 2;
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#endif
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for (repeats = 0; repeats < 2; ++repeats)
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{
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for (al = 0; al <= al_max; al += getpagesize () / 2)
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{
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for (i = 1; i < 8; ++i)
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{
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do_test (&json_ctx, al, 16 << i, 2048, 23, repeats);
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do_test (&json_ctx, al + i, 64, 256, 23, repeats);
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do_test (&json_ctx, al, 16 << i, 2048, 0, repeats);
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do_test (&json_ctx, al + i, 64, 256, 0, repeats);
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do_test (&json_ctx, al + getpagesize () - 15, 64, 256, 0,
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repeats);
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#ifdef USE_AS_MEMRCHR
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/* Also test the position close to the beginning for memrchr. */
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do_test (&json_ctx, al, i, 256, 23, repeats);
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do_test (&json_ctx, al, i, 256, 0, repeats);
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do_test (&json_ctx, al + i, i, 256, 23, repeats);
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do_test (&json_ctx, al + i, i, 256, 0, repeats);
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#endif
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (&json_ctx, al + i, i << 5, 192, 23, repeats);
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do_test (&json_ctx, al + i, i << 5, 192, 0, repeats);
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do_test (&json_ctx, al + i, i << 5, 256, 23, repeats);
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do_test (&json_ctx, al + i, i << 5, 256, 0, repeats);
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do_test (&json_ctx, al + i, i << 5, 512, 23, repeats);
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do_test (&json_ctx, al + i, i << 5, 512, 0, repeats);
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do_test (&json_ctx, al + getpagesize () - 15, i << 5, 256, 23,
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repeats);
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}
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}
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for (i = 1; i < 32; ++i)
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{
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do_test (&json_ctx, 0, i, i + 1, 23, repeats);
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do_test (&json_ctx, 0, i, i + 1, 0, repeats);
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do_test (&json_ctx, i, i, i + 1, 23, repeats);
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do_test (&json_ctx, i, i, i + 1, 0, repeats);
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do_test (&json_ctx, 0, i, i - 1, 23, repeats);
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do_test (&json_ctx, 0, i, i - 1, 0, repeats);
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do_test (&json_ctx, i, i, i - 1, 23, repeats);
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do_test (&json_ctx, i, i, i - 1, 0, repeats);
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do_test (&json_ctx, getpagesize () / 2, i, i + 1, 23, repeats);
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do_test (&json_ctx, getpagesize () / 2, i, i + 1, 0, repeats);
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do_test (&json_ctx, getpagesize () / 2 + i, i, i + 1, 23, repeats);
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do_test (&json_ctx, getpagesize () / 2 + i, i, i + 1, 0, repeats);
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do_test (&json_ctx, getpagesize () / 2, i, i - 1, 23, repeats);
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do_test (&json_ctx, getpagesize () / 2, i, i - 1, 0, repeats);
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do_test (&json_ctx, getpagesize () / 2 + i, i, i - 1, 23, repeats);
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do_test (&json_ctx, getpagesize () / 2 + i, i, i - 1, 0, repeats);
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do_test (&json_ctx, getpagesize () - 15, i, i - 1, 23, repeats);
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do_test (&json_ctx, getpagesize () - 15, i, i - 1, 0, repeats);
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do_test (&json_ctx, getpagesize () - 15, i, i + 1, 23, repeats);
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do_test (&json_ctx, getpagesize () - 15, i, i + 1, 0, repeats);
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#ifdef USE_AS_MEMRCHR
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do_test (&json_ctx, 0, 1, i + 1, 23, repeats);
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do_test (&json_ctx, 0, 2, i + 1, 0, repeats);
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#endif
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}
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for (al = 0; al <= al_max; al += getpagesize () / 2)
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{
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for (i = (16 / sizeof (CHAR)); i <= (8192 / sizeof (CHAR)); i += i)
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{
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for (j = 0; j <= (384 / sizeof (CHAR));
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j += (32 / sizeof (CHAR)))
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{
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do_test (&json_ctx, al, i + j, i, 23, repeats);
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do_test (&json_ctx, al, i, i + j, 23, repeats);
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if (j < i)
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{
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do_test (&json_ctx, al, i - j, i, 23, repeats);
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do_test (&json_ctx, al, i, i - j, 23, repeats);
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}
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}
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}
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}
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#ifndef USE_AS_MEMRCHR
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break;
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#endif
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}
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json_array_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_document_end (&json_ctx);
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return ret;
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}
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#include <support/test-driver.c>
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