389 lines
10 KiB
C
389 lines
10 KiB
C
/* Measure STRCHR 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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#define TEST_MAIN
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#ifndef WIDE
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# ifdef USE_FOR_STRCHRNUL
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# define TEST_NAME "strchrnul"
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# else
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# define TEST_NAME "strchr"
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# endif /* !USE_FOR_STRCHRNUL */
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#else
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# ifdef USE_FOR_STRCHRNUL
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# define TEST_NAME "wcschrnul"
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# else
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# define TEST_NAME "wcschr"
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# endif /* !USE_FOR_STRCHRNUL */
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#endif /* WIDE */
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#include "bench-string.h"
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#include "json-lib.h"
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#define BIG_CHAR MAX_CHAR
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#ifndef WIDE
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# ifdef USE_FOR_STRCHRNUL
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# undef STRCHR
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# define STRCHR strchrnul
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# define simple_STRCHR simple_STRCHRNUL
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# endif /* !USE_FOR_STRCHRNUL */
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# define MIDDLE_CHAR 127
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# define SMALL_CHAR 23
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#else
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# ifdef USE_FOR_STRCHRNUL
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# undef STRCHR
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# define STRCHR wcschrnul
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# define simple_STRCHR simple_WCSCHRNUL
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# endif /* !USE_FOR_STRCHRNUL */
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# define MIDDLE_CHAR 1121
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# define SMALL_CHAR 851
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#endif /* WIDE */
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#ifdef USE_FOR_STRCHRNUL
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# define DO_RAND_TEST(...)
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#else
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# define DO_RAND_TEST(...) do_rand_test(__VA_ARGS__)
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#endif
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#ifdef USE_FOR_STRCHRNUL
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# define NULLRET(endptr) endptr
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#else
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# define NULLRET(endptr) NULL
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#endif /* !USE_FOR_STRCHRNUL */
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typedef CHAR *(*proto_t) (const CHAR *, int);
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CHAR *
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simple_STRCHR (const CHAR *s, int c)
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{
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for (; *s != (CHAR) c; ++s)
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if (*s == '\0')
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return NULLRET ((CHAR *) s);
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return (CHAR *) s;
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}
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IMPL (simple_STRCHR, 0)
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IMPL (STRCHR, 1)
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#ifndef USE_FOR_STRCHRNUL
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/* Random benchmarks for strchr (if return is CHAR or NULL). The
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rational for the benchmark is returning null/char can be done with
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predicate execution (i.e cmovcc on x86) or a branch. */
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/* Large enough that full history can't be stored in BHT. */
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#define NUM_SEARCH_CHARS 2048
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/* Expectation is usecases of strchr check the return. Otherwise
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strchrnul would almost always be better. Since there is another
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branch coming we want to test the case where a potential branch in
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strchr can be used to skip a later mispredict because of the
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relationship between the two branches. */
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static void __attribute__ ((noinline, noclone))
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do_one_rand_plus_branch_test (json_ctx_t *json_ctx, impl_t *impl,
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const CHAR *s, const CHAR *c)
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{
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size_t i, iters = INNER_LOOP_ITERS_LARGE;
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int must_execute = 0;
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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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if (CALL (impl, s, c[i % NUM_SEARCH_CHARS]))
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{
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/* We just need something that will force compiler to emit
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a branch instead of conditional execution. */
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++must_execute;
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asm volatile("" : : :);
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}
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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 __attribute__ ((noinline, noclone))
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do_one_rand_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s,
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const CHAR *c)
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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[i % NUM_SEARCH_CHARS]);
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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_rand_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len,
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float perc_zero)
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{
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size_t i;
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int perc_zero_int;
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CHAR *buf = (CHAR *)buf1;
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CHAR *c = (CHAR *)buf2;
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align &= 127;
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if ((align + len) * sizeof (CHAR) >= page_size)
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return;
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/* Test is only interesting if we can hit both cases. */
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if (pos >= len)
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return;
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/* Segfault if we run the test. */
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if (NUM_SEARCH_CHARS * sizeof (CHAR) > 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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buf[align + i] = 2;
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}
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buf[align + len] = 0;
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buf[align + pos] = 1;
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perc_zero_int = perc_zero * RAND_MAX;
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for (i = 0; i < NUM_SEARCH_CHARS; ++i)
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{
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if (rand () > perc_zero_int)
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c[i] = 0;
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else
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c[i] = 1;
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}
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{
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "rand", 1);
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json_attr_uint (json_ctx, "branch", 1);
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json_attr_double (json_ctx, "perc-zero", perc_zero);
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json_attr_uint (json_ctx, "length", len);
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json_attr_uint (json_ctx, "pos", pos);
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json_attr_uint (json_ctx, "alignment", align);
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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_rand_plus_branch_test (json_ctx, impl, buf + align, c);
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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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{
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "rand", 1);
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json_attr_uint (json_ctx, "branch", 0);
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json_attr_double (json_ctx, "perc-zero", perc_zero);
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json_attr_uint (json_ctx, "length", len);
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json_attr_uint (json_ctx, "pos", pos);
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json_attr_uint (json_ctx, "alignment", align);
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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_rand_test (json_ctx, impl, buf + align, c);
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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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}
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#endif
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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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const 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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const 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, res,
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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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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 max_char)
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/* For wcschr: align here means align not in bytes,
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but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
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len for wcschr here isn't in bytes but it's number of wchar_t symbols. */
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{
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size_t i;
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CHAR *result;
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CHAR *buf = (CHAR *) buf1;
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align &= 127;
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if ((align + len) * sizeof (CHAR) >= 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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buf[align + i] = 32 + 23 * i % max_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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else if (buf[align + i] == 0)
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buf[align + i] = 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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buf[align + pos] = seek_char;
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result = buf + align + pos;
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}
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else if (seek_char == 0)
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result = buf + align + len;
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else
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result = NULLRET (buf + align + len);
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "rand", 0);
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json_attr_uint (json_ctx, "length", len);
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json_attr_uint (json_ctx, "pos", pos);
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json_attr_uint (json_ctx, "seek_char", seek_char);
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json_attr_uint (json_ctx, "max_char", max_char);
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json_attr_uint (json_ctx, "alignment", align);
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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, buf + align, seek_char, result);
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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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json_ctx_t json_ctx;
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size_t i;
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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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for (i = 1; i < 8; ++i)
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{
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do_test (&json_ctx, 0, 16 << i, 2048, SMALL_CHAR, MIDDLE_CHAR);
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do_test (&json_ctx, i, 16 << i, 2048, SMALL_CHAR, 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 (&json_ctx, 0, 16 << i, 4096, SMALL_CHAR, MIDDLE_CHAR);
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do_test (&json_ctx, i, 16 << i, 4096, SMALL_CHAR, 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 (&json_ctx, i, 64, 256, SMALL_CHAR, MIDDLE_CHAR);
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do_test (&json_ctx, i, 64, 256, SMALL_CHAR, BIG_CHAR);
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}
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for (i = 0; i < 8; ++i)
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{
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do_test (&json_ctx, 16 * i, 256, 512, SMALL_CHAR, MIDDLE_CHAR);
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do_test (&json_ctx, 16 * i, 256, 512, SMALL_CHAR, BIG_CHAR);
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}
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for (i = 0; i < 32; ++i)
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{
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do_test (&json_ctx, 0, i, i + 1, SMALL_CHAR, MIDDLE_CHAR);
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do_test (&json_ctx, 0, i, i + 1, SMALL_CHAR, BIG_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 (&json_ctx, 0, 16 << i, 2048, 0, MIDDLE_CHAR);
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do_test (&json_ctx, i, 16 << i, 2048, 0, 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 (&json_ctx, 0, 16 << i, 4096, 0, MIDDLE_CHAR);
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do_test (&json_ctx, i, 16 << i, 4096, 0, 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 (&json_ctx, i, 64, 256, 0, MIDDLE_CHAR);
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do_test (&json_ctx, i, 64, 256, 0, BIG_CHAR);
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}
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for (i = 0; i < 8; ++i)
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{
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do_test (&json_ctx, 16 * i, 256, 512, 0, MIDDLE_CHAR);
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do_test (&json_ctx, 16 * i, 256, 512, 0, BIG_CHAR);
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}
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for (i = 0; i < 32; ++i)
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{
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do_test (&json_ctx, 0, i, i + 1, 0, MIDDLE_CHAR);
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do_test (&json_ctx, 0, i, i + 1, 0, BIG_CHAR);
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}
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.0);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.1);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.25);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.33);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.5);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.66);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.75);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.9);
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DO_RAND_TEST(&json_ctx, 0, 15, 16, 1.0);
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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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