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Add optimized x86-64 implementation of strnlen.
While at it, beef up the test suite for strnlen and add performance tests for it, too.
This commit is contained in:
Ulrich Drepper
parent
8e96b93aa7
commit
24fb0f88ed
@ -1,3 +1,12 @@
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2010-07-26 Ulrich Drepper <drepper@redhat.com>
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* string/test-strnlen.c: New file.
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* string/Makefile (strop-tests): Add strnlen.
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* string/tester.c (test_strnlen): Add a few more test cases.
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* string/tst-strlen.c: Better error reporting.
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* sysdeps/x86_64/strnlen.S: New file.
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2010-07-24 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/x86_64/multiarch/strstr.c (__m128i_strloadu_tolower): Use
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@ -49,7 +49,7 @@ o-objects.ob := memcpy.o memset.o memchr.o
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strop-tests := memchr memcmp memcpy memmove mempcpy memset memccpy \
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stpcpy stpncpy strcat strchr strcmp strcpy strcspn \
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strlen strncmp strncpy strpbrk strrchr strspn memmem \
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strstr strcasestr
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strstr strcasestr strnlen
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tests := tester inl-tester noinl-tester testcopy test-ffs \
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tst-strlen stratcliff tst-svc tst-inlcall \
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bug-strncat1 bug-strspn1 bug-strpbrk1 tst-bswap \
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197
string/test-strnlen.c
Normal file
197
string/test-strnlen.c
Normal file
@ -0,0 +1,197 @@
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/* Test and measure strlen functions.
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Copyright (C) 1999, 2002, 2003, 2005, 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Jakub Jelinek <jakub@redhat.com>, 1999.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#define TEST_MAIN
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#include "test-string.h"
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typedef size_t (*proto_t) (const char *, size_t);
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size_t simple_strnlen (const char *, size_t);
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IMPL (simple_strnlen, 0)
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IMPL (strnlen, 1)
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size_t
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simple_strnlen (const char *s, size_t maxlen)
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{
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size_t i;
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for (i = 0; i < maxlen && s[i]; ++i);
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return i;
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}
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static void
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do_one_test (impl_t *impl, const char *s, size_t maxlen, size_t exp_len)
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{
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size_t len = CALL (impl, s, maxlen);
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if (len != exp_len)
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{
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error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
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len, exp_len);
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ret = 1;
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return;
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}
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if (HP_TIMING_AVAIL)
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{
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hp_timing_t start __attribute ((unused));
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hp_timing_t stop __attribute ((unused));
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hp_timing_t best_time = ~ (hp_timing_t) 0;
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size_t i;
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for (i = 0; i < 32; ++i)
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{
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HP_TIMING_NOW (start);
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CALL (impl, s, maxlen);
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HP_TIMING_NOW (stop);
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HP_TIMING_BEST (best_time, start, stop);
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}
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printf ("\t%zd", (size_t) best_time);
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}
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}
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static void
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do_test (size_t align, size_t len, size_t maxlen, int max_char)
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{
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size_t i;
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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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buf1[align + i] = 1 + 7 * i % max_char;
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buf1[align + len] = 0;
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if (HP_TIMING_AVAIL)
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printf ("Length %4zd, alignment %2zd:", len, align);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (char *) (buf1 + align), maxlen, MIN (len, maxlen));
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if (HP_TIMING_AVAIL)
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putchar ('\n');
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}
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static void
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do_random_tests (void)
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{
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size_t i, j, n, align, len;
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unsigned char *p = buf1 + page_size - 512;
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for (n = 0; n < ITERATIONS; n++)
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{
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align = random () & 15;
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len = random () & 511;
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if (len + align > 510)
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len = 511 - align - (random () & 7);
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j = len + align + 64;
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if (j > 512)
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j = 512;
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for (i = 0; i < j; i++)
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{
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if (i == len + align)
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p[i] = 0;
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else
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{
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p[i] = random () & 255;
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if (i >= align && i < len + align && !p[i])
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p[i] = (random () & 127) + 1;
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}
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}
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FOR_EACH_IMPL (impl, 1)
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{
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if (len > 0
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&& CALL (impl, (char *) (p + align), len - 1) != len - 1)
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{
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error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
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n, impl->name, align,
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CALL (impl, (char *) (p + align), len - 1), len - 1, p);
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ret = 1;
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}
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if (CALL (impl, (char *) (p + align), len) != len)
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{
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error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
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n, impl->name, align,
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CALL (impl, (char *) (p + align), len), len, p);
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ret = 1;
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}
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if (CALL (impl, (char *) (p + align), len + 1) != len)
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{
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error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
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n, impl->name, align,
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CALL (impl, (char *) (p + align), len + 1), len, p);
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ret = 1;
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}
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}
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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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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 < 8; ++i)
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{
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do_test (0, i, i - 1, 127);
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do_test (0, i, i, 127);
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do_test (0, i, i + 1, 127);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (i, i, i - 1, 127);
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do_test (i, i, i, 127);
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do_test (i, i, i + 1, 127);
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}
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for (i = 2; i <= 10; ++i)
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{
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do_test (0, 1 << i, 5000, 127);
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do_test (1, 1 << i, 5000, 127);
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}
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for (i = 1; i < 8; ++i)
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do_test (0, i, 5000, 255);
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for (i = 1; i < 8; ++i)
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do_test (i, i, 5000, 255);
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for (i = 2; i <= 10; ++i)
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{
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do_test (0, 1 << i, 5000, 255);
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do_test (1, 1 << i, 5000, 255);
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}
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do_random_tests ();
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return ret;
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}
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#include "../test-skeleton.c"
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@ -1,5 +1,5 @@
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/* Tester for string functions.
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Copyright (C) 1995-2001, 2003, 2005, 2008 Free Software Foundation, Inc.
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Copyright (C) 1995-2001, 2003, 2005, 2008, 2010 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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@ -441,19 +441,20 @@ test_strnlen (void)
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check (strnlen ("", 10) == 0, 1); /* Empty. */
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check (strnlen ("a", 10) == 1, 2); /* Single char. */
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check (strnlen ("abcd", 10) == 4, 3); /* Multiple chars. */
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check (strnlen ("foo", (size_t)-1) == 3, 4); /* limits of n. */
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check (strnlen ("foo", (size_t) -1) == 3, 4); /* limits of n. */
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check (strnlen ("abcd", 0) == 0, 5); /* Restricted. */
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check (strnlen ("abcd", 1) == 1, 6); /* Restricted. */
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check (strnlen ("abcd", 2) == 2, 7); /* Restricted. */
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check (strnlen ("abcd", 3) == 3, 8); /* Restricted. */
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check (strnlen ("abcd", 4) == 4, 9); /* Restricted. */
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{
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char buf[4096];
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int i;
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char *p;
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for (i=0; i < 0x100; i++)
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for (int i = 0; i < 0x100; ++i)
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{
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p = (char *) ((unsigned long int)(buf + 0xff) & ~0xff) + i;
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char *p = (char *) ((unsigned long int)(buf + 0xff) & ~0xff) + i;
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strcpy (p, "OK");
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strcpy (p+3, "BAD/WRONG");
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check (strnlen (p, 100) == 2, 5+i);
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}
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strcpy (p + 3, "BAD/WRONG");
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check (strnlen (p, 100) == 2, 10 + i);
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}
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}
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@ -31,11 +31,21 @@ main(int argc, char *argv[])
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buf[words * 4 + 3] = (last & 8) != 0 ? 'e' : '\0';
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buf[words * 4 + 4] = '\0';
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if (strlen (buf) != words * 4 + lens[last]
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|| strnlen (buf, -1) != words * 4 + lens[last])
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if (strlen (buf) != words * 4 + lens[last])
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{
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printf ("failed for base=%Zu, words=%Zu, and last=%Zu\n",
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base, words, last);
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printf ("\
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strlen failed for base=%Zu, words=%Zu, and last=%Zu (is %zd, expected %zd)\n",
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base, words, last,
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strlen (buf), words * 4 + lens[last]);
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return 1;
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}
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if (strnlen (buf, -1) != words * 4 + lens[last])
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{
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printf ("\
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strnlen failed for base=%Zu, words=%Zu, and last=%Zu (is %zd, expected %zd)\n",
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base, words, last,
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strnlen (buf, -1), words * 4 + lens[last]);
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return 1;
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}
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}
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64
sysdeps/x86_64/strnlen.S
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64
sysdeps/x86_64/strnlen.S
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@ -0,0 +1,64 @@
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/* strnlen(str,maxlen) -- determine the length of the string STR up to MAXLEN.
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Copyright (C) 2010 Free Software Foundation, Inc.
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Contributed by Ulrich Drepper <drepper@redhat.com>.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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.text
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ENTRY(__strnlen)
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movq %rsi, %rax
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testq %rsi, %rsi
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jz 3f
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pxor %xmm2, %xmm2
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movq %rdi, %rcx
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movq %rdi, %r8
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movq $16, %r9
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andq $~15, %rdi
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movdqa %xmm2, %xmm1
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pcmpeqb (%rdi), %xmm2
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orl $0xffffffff, %r10d
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subq %rdi, %rcx
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shll %cl, %r10d
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subq %rcx, %r9
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pmovmskb %xmm2, %edx
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andl %r10d, %edx
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jnz 1f
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subq %r9, %rsi
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jbe 3f
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2: movdqa 16(%rdi), %xmm0
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leaq 16(%rdi), %rdi
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %edx
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testl %edx, %edx
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jnz 1f
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subq $16, %rsi
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jnbe 2b
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3: ret
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1: subq %r8, %rdi
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bsfl %edx, %edx
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addq %rdi, %rdx
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cmpq %rdx, %rax
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cmovnbq %rdx, %rax
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ret
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END(__strnlen)
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weak_alias (__strnlen, strnlen)
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libc_hidden_def (strnlen)
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