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authorUlrich Drepper <drepper@redhat.com>2010-07-26 08:37:08 -0700
committerUlrich Drepper <drepper@redhat.com>2010-07-26 08:37:08 -0700
commit24fb0f88ed29d21b6034559e9c55545f22556bc0 (patch)
tree51b61ee2442da648a3fc724437188b2a99aadcff /string/test-strnlen.c
parent8e96b93aa7855683d0be3c65ce81e66d0786ba84 (diff)
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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.
Diffstat (limited to 'string/test-strnlen.c')
-rw-r--r--string/test-strnlen.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/string/test-strnlen.c b/string/test-strnlen.c
new file mode 100644
index 0000000..cb8c80f
--- /dev/null
+++ b/string/test-strnlen.c
@@ -0,0 +1,197 @@
+/* Test and measure strlen functions.
+ Copyright (C) 1999, 2002, 2003, 2005, 2010 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Written by Jakub Jelinek <jakub@redhat.com>, 1999.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#define TEST_MAIN
+#include "test-string.h"
+
+typedef size_t (*proto_t) (const char *, size_t);
+size_t simple_strnlen (const char *, size_t);
+
+IMPL (simple_strnlen, 0)
+IMPL (strnlen, 1)
+
+size_t
+simple_strnlen (const char *s, size_t maxlen)
+{
+ size_t i;
+
+ for (i = 0; i < maxlen && s[i]; ++i);
+ return i;
+}
+
+static void
+do_one_test (impl_t *impl, const char *s, size_t maxlen, size_t exp_len)
+{
+ size_t len = CALL (impl, s, maxlen);
+ if (len != exp_len)
+ {
+ error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
+ len, exp_len);
+ ret = 1;
+ return;
+ }
+
+ if (HP_TIMING_AVAIL)
+ {
+ hp_timing_t start __attribute ((unused));
+ hp_timing_t stop __attribute ((unused));
+ hp_timing_t best_time = ~ (hp_timing_t) 0;
+ size_t i;
+
+ for (i = 0; i < 32; ++i)
+ {
+ HP_TIMING_NOW (start);
+ CALL (impl, s, maxlen);
+ HP_TIMING_NOW (stop);
+ HP_TIMING_BEST (best_time, start, stop);
+ }
+
+ printf ("\t%zd", (size_t) best_time);
+ }
+}
+
+static void
+do_test (size_t align, size_t len, size_t maxlen, int max_char)
+{
+ size_t i;
+
+ align &= 7;
+ if (align + len >= page_size)
+ return;
+
+ for (i = 0; i < len; ++i)
+ buf1[align + i] = 1 + 7 * i % max_char;
+ buf1[align + len] = 0;
+
+ if (HP_TIMING_AVAIL)
+ printf ("Length %4zd, alignment %2zd:", len, align);
+
+ FOR_EACH_IMPL (impl, 0)
+ do_one_test (impl, (char *) (buf1 + align), maxlen, MIN (len, maxlen));
+
+ if (HP_TIMING_AVAIL)
+ putchar ('\n');
+}
+
+static void
+do_random_tests (void)
+{
+ size_t i, j, n, align, len;
+ unsigned char *p = buf1 + page_size - 512;
+
+ for (n = 0; n < ITERATIONS; n++)
+ {
+ align = random () & 15;
+ len = random () & 511;
+ if (len + align > 510)
+ len = 511 - align - (random () & 7);
+ j = len + align + 64;
+ if (j > 512)
+ j = 512;
+
+ for (i = 0; i < j; i++)
+ {
+ if (i == len + align)
+ p[i] = 0;
+ else
+ {
+ p[i] = random () & 255;
+ if (i >= align && i < len + align && !p[i])
+ p[i] = (random () & 127) + 1;
+ }
+ }
+
+ FOR_EACH_IMPL (impl, 1)
+ {
+ if (len > 0
+ && CALL (impl, (char *) (p + align), len - 1) != len - 1)
+ {
+ error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
+ n, impl->name, align,
+ CALL (impl, (char *) (p + align), len - 1), len - 1, p);
+ ret = 1;
+ }
+ if (CALL (impl, (char *) (p + align), len) != len)
+ {
+ error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
+ n, impl->name, align,
+ CALL (impl, (char *) (p + align), len), len, p);
+ ret = 1;
+ }
+ if (CALL (impl, (char *) (p + align), len + 1) != len)
+ {
+ error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
+ n, impl->name, align,
+ CALL (impl, (char *) (p + align), len + 1), len, p);
+ ret = 1;
+ }
+ }
+ }
+}
+
+int
+test_main (void)
+{
+ size_t i;
+
+ test_init ();
+
+ printf ("%20s", "");
+ FOR_EACH_IMPL (impl, 0)
+ printf ("\t%s", impl->name);
+ putchar ('\n');
+
+ for (i = 1; i < 8; ++i)
+ {
+ do_test (0, i, i - 1, 127);
+ do_test (0, i, i, 127);
+ do_test (0, i, i + 1, 127);
+ }
+
+ for (i = 1; i < 8; ++i)
+ {
+ do_test (i, i, i - 1, 127);
+ do_test (i, i, i, 127);
+ do_test (i, i, i + 1, 127);
+ }
+
+ for (i = 2; i <= 10; ++i)
+ {
+ do_test (0, 1 << i, 5000, 127);
+ do_test (1, 1 << i, 5000, 127);
+ }
+
+ for (i = 1; i < 8; ++i)
+ do_test (0, i, 5000, 255);
+
+ for (i = 1; i < 8; ++i)
+ do_test (i, i, 5000, 255);
+
+ for (i = 2; i <= 10; ++i)
+ {
+ do_test (0, 1 << i, 5000, 255);
+ do_test (1, 1 << i, 5000, 255);
+ }
+
+ do_random_tests ();
+ return ret;
+}
+
+#include "../test-skeleton.c"