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7bb3a8a556
Don't reuse buffers for different strncmp implementations since the earlier implementation will end up warming the cache for the later one. Eventually there should be a more elegant way to do this. * benchtests/bench-strncmp.c (do_test_limit): Reallocate buffers for every implementation. (do_test): Likewise.
345 lines
9.1 KiB
C
345 lines
9.1 KiB
C
/* Measure strncmp functions.
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Copyright (C) 2013-2018 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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#ifdef WIDE
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# define TEST_NAME "wcsncmp"
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#else
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# define TEST_NAME "strncmp"
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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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#ifdef WIDE
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# include <wchar.h>
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# define L(str) L##str
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# define STRNCMP wcsncmp
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# define SIMPLE_STRNCMP simple_wcsncmp
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# define STUPID_STRNCMP stupid_wcsncmp
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# define CHAR wchar_t
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# define CHARBYTES 4
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/* Wcsncmp uses signed semantics for comparison, not unsigned.
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Avoid using substraction since possible overflow. */
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int
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simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
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{
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wchar_t c1, c2;
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while (n--)
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{
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c1 = *s1++;
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c2 = *s2++;
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if (c1 == L ('\0') || c1 != c2)
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return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
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}
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return 0;
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}
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int
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stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
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{
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wchar_t c1, c2;
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size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;
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n = ns1 < n ? ns1 : n;
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n = ns2 < n ? ns2 : n;
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while (n--)
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{
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c1 = *s1++;
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c2 = *s2++;
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if (c1 != c2)
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return c1 > c2 ? 1 : -1;
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}
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return 0;
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}
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#else
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# define L(str) str
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# define STRNCMP strncmp
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# define SIMPLE_STRNCMP simple_strncmp
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# define STUPID_STRNCMP stupid_strncmp
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# define CHAR char
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# define CHARBYTES 1
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/* Strncmp uses unsigned semantics for comparison. */
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int
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simple_strncmp (const char *s1, const char *s2, size_t n)
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{
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int ret = 0;
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while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
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&& *s1++);
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return ret;
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}
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int
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stupid_strncmp (const char *s1, const char *s2, size_t n)
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{
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size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
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int ret = 0;
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n = ns1 < n ? ns1 : n;
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n = ns2 < n ? ns2 : n;
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while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
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return ret;
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}
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#endif /* !WIDE */
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typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
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IMPL (STUPID_STRNCMP, 0)
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IMPL (SIMPLE_STRNCMP, 0)
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IMPL (STRNCMP, 1)
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static void
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do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1, const CHAR
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*s2, size_t n, int exp_result)
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{
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size_t i, iters = INNER_LOOP_ITERS;
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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, s1, s2, 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_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
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size_t n, int max_char, int exp_result)
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{
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size_t i, align_n;
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CHAR *s1, *s2;
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if (n == 0)
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{
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "strlen", (double) len);
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json_attr_uint (json_ctx, "len", (double) n);
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json_attr_uint (json_ctx, "align1", (double) 0);
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json_attr_uint (json_ctx, "align2", (double) 0);
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json_array_begin (json_ctx, "timings");
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FOR_EACH_IMPL (impl, 0)
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{
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realloc_bufs ();
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s1 = (CHAR *) (buf1 + page_size);
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s2 = (CHAR *) (buf2 + page_size);
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do_one_test (json_ctx, impl, s1, s2, n, 0);
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}
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json_array_end (json_ctx);
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json_element_object_end (json_ctx);
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return;
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}
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align1 &= 15;
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align2 &= 15;
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align_n = (page_size - n * CHARBYTES) & 15;
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "strlen", (double) len);
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json_attr_uint (json_ctx, "len", (double) n);
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json_attr_uint (json_ctx, "align1", (double) align1);
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json_attr_uint (json_ctx, "align2", (double) align2);
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json_array_begin (json_ctx, "timings");
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FOR_EACH_IMPL (impl, 0)
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{
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realloc_bufs ();
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s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
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s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
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if (align1 < align_n)
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s1 = (CHAR *) ((char *) s1 - (align_n - align1));
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if (align2 < align_n)
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s2 = (CHAR *) ((char *) s2 - (align_n - align2));
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + 23 * i % max_char;
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if (len < n)
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{
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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}
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do_one_test (json_ctx, impl, s1, s2, n, exp_result);
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}
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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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static void
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do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t
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n, int max_char, int exp_result)
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{
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size_t i;
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CHAR *s1, *s2;
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if (n == 0)
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return;
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align1 &= 63;
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if (align1 + (n + 1) * CHARBYTES >= page_size)
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return;
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align2 &= 7;
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if (align2 + (n + 1) * CHARBYTES >= page_size)
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return;
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "strlen", (double) len);
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json_attr_uint (json_ctx, "len", (double) n);
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json_attr_uint (json_ctx, "align1", (double) align1);
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json_attr_uint (json_ctx, "align2", (double) align2);
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json_array_begin (json_ctx, "timings");
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FOR_EACH_IMPL (impl, 0)
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{
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realloc_bufs ();
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s1 = (CHAR *) (buf1 + align1);
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s2 = (CHAR *) (buf2 + align2);
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
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s1[n] = 24 + exp_result;
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s2[n] = 23;
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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if (len >= n)
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s2[n - 1] -= exp_result;
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do_one_test (json_ctx, impl, s1, s2, n, exp_result);
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}
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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", "default");
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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 =0; i < 16; ++i)
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{
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do_test (&json_ctx, 0, 0, 8, i, 127, 0);
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do_test (&json_ctx, 0, 0, 8, i, 127, -1);
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do_test (&json_ctx, 0, 0, 8, i, 127, 1);
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do_test (&json_ctx, i, i, 8, i, 127, 0);
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do_test (&json_ctx, i, i, 8, i, 127, 1);
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do_test (&json_ctx, i, i, 8, i, 127, -1);
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do_test (&json_ctx, i, 2 * i, 8, i, 127, 0);
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do_test (&json_ctx, 2 * i, i, 8, i, 127, 1);
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do_test (&json_ctx, i, 3 * i, 8, i, 127, -1);
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do_test (&json_ctx, 0, 0, 8, i, 255, 0);
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do_test (&json_ctx, 0, 0, 8, i, 255, -1);
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do_test (&json_ctx, 0, 0, 8, i, 255, 1);
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do_test (&json_ctx, i, i, 8, i, 255, 0);
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do_test (&json_ctx, i, i, 8, i, 255, 1);
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do_test (&json_ctx, i, i, 8, i, 255, -1);
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do_test (&json_ctx, i, 2 * i, 8, i, 255, 0);
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do_test (&json_ctx, 2 * i, i, 8, i, 255, 1);
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do_test (&json_ctx, i, 3 * i, 8, i, 255, -1);
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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, 0, 8 << i, 16 << i, 127, 0);
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do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 1);
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do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, -1);
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do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, 0);
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do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, 1);
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do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, -1);
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do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
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do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
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do_test (&json_ctx, 2 * i, i, 8 << i, 16 << i, 255, 0);
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do_test (&json_ctx, 2 * i, i, 8 << i, 16 << i, 255, 1);
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}
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do_test_limit (&json_ctx, 0, 0, 0, 0, 127, 0);
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do_test_limit (&json_ctx, 4, 0, 21, 20, 127, 0);
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do_test_limit (&json_ctx, 0, 4, 21, 20, 127, 0);
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do_test_limit (&json_ctx, 8, 0, 25, 24, 127, 0);
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do_test_limit (&json_ctx, 0, 8, 25, 24, 127, 0);
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for (i = 0; i < 8; ++i)
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{
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do_test_limit (&json_ctx, 0, 0, 17 - i, 16 - i, 127, 0);
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do_test_limit (&json_ctx, 0, 0, 17 - i, 16 - i, 255, 0);
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do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, 0);
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do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, 1);
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do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, -1);
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do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, 0);
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do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, 1);
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do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, -1);
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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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