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327 lines
9.3 KiB
C
327 lines
9.3 KiB
C
/* Measure strcmp and wcscmp functions.
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Copyright (C) 2013-2023 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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#ifdef WIDE
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# define TEST_NAME "wcscmp"
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#else
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# define TEST_NAME "strcmp"
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#endif
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#include "bench-string.h"
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#ifdef WIDE
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# define L(str) L##str
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# define SIMPLE_STRCMP simple_wcscmp
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# define CHARBYTESLOG 2
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# define MIDCHAR 0x7fffffff
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# define LARGECHAR 0xfffffffe
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/* Wcscmp 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_wcscmp (const wchar_t *s1, const wchar_t *s2)
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{
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wchar_t c1, c2;
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do
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{
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c1 = *s1++;
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c2 = *s2++;
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if (c2 == L'\0')
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return c1 - c2;
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}
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while (c1 == c2);
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return c1 < c2 ? -1 : 1;
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}
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#else
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# include <limits.h>
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# define L(str) str
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# define SIMPLE_STRCMP simple_strcmp
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# define CHARBYTESLOG 0
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# define MIDCHAR 0x7f
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# define LARGECHAR 0xfe
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/* Strcmp uses unsigned semantics for comparison. */
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int
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simple_strcmp (const char *s1, const char *s2)
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{
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int ret;
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while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);
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return ret;
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}
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#endif
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# include "json-lib.h"
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typedef int (*proto_t) (const CHAR *, const CHAR *);
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IMPL (SIMPLE_STRCMP, 1)
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IMPL (STRCMP, 1)
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static void
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do_one_test (json_ctx_t *json_ctx, impl_t *impl,
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const CHAR *s1, const CHAR *s2,
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int exp_result)
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{
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size_t i, iters = INNER_LOOP_ITERS8;
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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);
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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 align1, size_t align2, size_t len,
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int max_char, int exp_result, int at_end)
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{
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size_t i;
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CHAR *s1, *s2;
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if (len == 0)
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return;
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align1 &= ~(CHARBYTES - 1);
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align2 &= ~(CHARBYTES - 1);
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align1 &= (getpagesize () - 1);
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if (align1 + (len + 1) * CHARBYTES >= page_size)
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return;
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align2 &= (getpagesize () - 1);
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if (align2 + (len + 1) * CHARBYTES >= page_size)
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return;
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/* Put them close to the end of page. */
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if (at_end)
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{
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i = align1 + CHARBYTES * (len + 2);
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align1 = ((page_size - i) / 16 * 16) + align1;
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i = align2 + CHARBYTES * (len + 2);
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align2 = ((page_size - i) / 16 * 16) + align2;
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}
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s1 = (CHAR *)(buf1 + align1);
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s2 = (CHAR *)(buf2 + align2);
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for (i = 0; i < len; i++)
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s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
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s1[len] = s2[len] = 0;
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s1[len + 1] = 23;
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s2[len + 1] = 24 + exp_result;
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s2[len - 1] -= exp_result;
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "length", (double)len);
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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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do_one_test (json_ctx, impl, s1, s2, exp_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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static void
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do_one_test_page_boundary (json_ctx_t *json_ctx, CHAR *s1, CHAR *s2,
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size_t align1, size_t align2, size_t len,
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int exp_result)
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{
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "length", (double) len);
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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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do_one_test (json_ctx, impl, s1, s2, exp_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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static void
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do_test_page_boundary (json_ctx_t *json_ctx)
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{
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/* To trigger bug 25933, we need a size that is equal to the vector
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length times 4. In the case of AVX2 for Intel, we need 32 * 4. We
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make this test generic and run it for all architectures as additional
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boundary testing for such related algorithms. */
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size_t size = 32 * 4;
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size_t len;
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CHAR *s1 = (CHAR *) (buf1 + (BUF1PAGES - 1) * page_size);
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CHAR *s2 = (CHAR *) (buf2 + (BUF1PAGES - 1) * page_size);
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int exp_result;
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memset (s1, 'a', page_size);
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memset (s2, 'a', page_size);
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s1[(page_size / CHARBYTES) - 1] = (CHAR) 0;
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s2[(page_size / CHARBYTES) - 1] = (CHAR) 0;
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/* Iterate over a size that is just below where we expect the bug to
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trigger up to the size we expect will trigger the bug e.g. [99-128].
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Likewise iterate the start of two strings between 30 and 31 bytes
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away from the boundary to simulate alignment changes. */
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for (size_t s = 99; s <= size; s++)
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for (size_t s1a = 30; s1a < 32; s1a++)
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for (size_t s2a = 30; s2a < 32; s2a++)
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{
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size_t align1 = (page_size / CHARBYTES - s) - s1a;
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size_t align2 = (page_size / CHARBYTES - s) - s2a;
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CHAR *s1p = s1 + align1;
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CHAR *s2p = s2 + align2;
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len = (page_size / CHARBYTES) - 1 - align1;
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exp_result = SIMPLE_STRCMP (s1p, s2p);
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do_one_test_page_boundary (json_ctx, s1p, s2p, align1, align2,
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len, exp_result);
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}
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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, j, k;
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size_t pg_sz = getpagesize ();
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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 (k = 0; k < 2; ++k)
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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, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0, k);
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do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1, k);
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do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1, k);
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}
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for (i = 1; i <= 8192;)
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{
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/* No page crosses. */
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do_test (&json_ctx, 0, 0, i, MIDCHAR, 0, k);
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do_test (&json_ctx, i * CHARBYTES, 0, i, MIDCHAR, 0, k);
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do_test (&json_ctx, 0, i * CHARBYTES, i, MIDCHAR, 0, k);
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/* False page crosses. */
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do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, MIDCHAR, 0,
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k);
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do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, MIDCHAR, 0,
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k);
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do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, MIDCHAR, 0, k);
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do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, MIDCHAR, 0, k);
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/* Real page cross. */
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for (j = 16; j < 128; j += 16)
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{
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do_test (&json_ctx, pg_sz - j, 0, i, MIDCHAR, 0, k);
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do_test (&json_ctx, 0, pg_sz - j, i, MIDCHAR, 0, k);
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do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, MIDCHAR, 0, k);
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do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, MIDCHAR, 0, k);
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}
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if (i < 32)
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{
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++i;
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}
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else if (i < 160)
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{
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i += 8;
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}
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else if (i < 512)
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{
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i += 32;
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}
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else
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{
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i *= 2;
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}
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}
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for (i = 1; i < 10 + CHARBYTESLOG; ++i)
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{
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do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0, k);
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do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0, k);
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do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1, k);
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do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1, k);
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do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1, k);
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do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1, k);
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do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1, k);
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do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i,
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LARGECHAR, 1, k);
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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, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i,
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MIDCHAR, 0, k);
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do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i,
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LARGECHAR, 0, k);
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do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i,
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MIDCHAR, 1, k);
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do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i,
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LARGECHAR, 1, k);
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do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i,
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MIDCHAR, -1, k);
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do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i,
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LARGECHAR, -1, k);
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}
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}
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do_test_page_boundary (&json_ctx);
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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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