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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-06-04 16:48:56 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-06-11 15:08:13 +0530
commit9702047480d9002522936c5e1e1ebe16f696880d (patch)
tree9b37e288e4d57012a6186c280fd8837deca6dd4c /benchtests/bench-memccpy.c
parentc1f75dc386d533806d29b7e94118363a7b50eed8 (diff)
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Copy over string performance tests into benchtests
Copy over already existing string performance tests into benchtests. Bits not related to performance measurements have been omitted.
Diffstat (limited to 'benchtests/bench-memccpy.c')
-rw-r--r--benchtests/bench-memccpy.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/benchtests/bench-memccpy.c b/benchtests/bench-memccpy.c
new file mode 100644
index 0000000000..612513c68d
--- /dev/null
+++ b/benchtests/bench-memccpy.c
@@ -0,0 +1,169 @@
+/* Measure memccpy functions.
+ Copyright (C) 2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#define TEST_MAIN
+#define TEST_NAME "memccpy"
+#include "bench-string.h"
+
+void *simple_memccpy (void *, const void *, int, size_t);
+void *stupid_memccpy (void *, const void *, int, size_t);
+
+IMPL (stupid_memccpy, 0)
+IMPL (simple_memccpy, 0)
+IMPL (memccpy, 1)
+
+void *
+simple_memccpy (void *dst, const void *src, int c, size_t n)
+{
+ const char *s = src;
+ char *d = dst;
+
+ while (n-- > 0)
+ if ((*d++ = *s++) == (char) c)
+ return d;
+
+ return NULL;
+}
+
+void *
+stupid_memccpy (void *dst, const void *src, int c, size_t n)
+{
+ void *p = memchr (src, c, n);
+
+ if (p != NULL)
+ return mempcpy (dst, src, p - src + 1);
+
+ memcpy (dst, src, n);
+ return NULL;
+}
+
+typedef void *(*proto_t) (void *, const void *, int c, size_t);
+
+static void
+do_one_test (impl_t *impl, void *dst, const void *src, int c, size_t len,
+ size_t n)
+{
+ void *expect = len > n ? NULL : (char *) dst + len;
+ if (CALL (impl, dst, src, c, n) != expect)
+ {
+ error (0, 0, "Wrong result in function %s %p %p", impl->name,
+ CALL (impl, dst, src, c, n), expect);
+ ret = 1;
+ return;
+ }
+
+ if (memcmp (dst, src, len > n ? n : len) != 0)
+ {
+ error (0, 0, "Wrong result in function %s", impl->name);
+ 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, dst, src, c, n);
+ HP_TIMING_NOW (stop);
+ HP_TIMING_BEST (best_time, start, stop);
+ }
+
+ printf ("\t%zd", (size_t) best_time);
+ }
+}
+
+static void
+do_test (size_t align1, size_t align2, int c, size_t len, size_t n,
+ int max_char)
+{
+ size_t i;
+ char *s1, *s2;
+
+ align1 &= 7;
+ if (align1 + len >= page_size)
+ return;
+
+ align2 &= 7;
+ if (align2 + len >= page_size)
+ return;
+
+ s1 = (char *) (buf1 + align1);
+ s2 = (char *) (buf2 + align2);
+
+ for (i = 0; i < len - 1; ++i)
+ {
+ s1[i] = 32 + 23 * i % (max_char - 32);
+ if (s1[i] == (char) c)
+ --s1[i];
+ }
+ s1[len - 1] = c;
+ for (i = len; i + align1 < page_size && i < len + 64; ++i)
+ s1[i] = 32 + 32 * i % (max_char - 32);
+
+ if (HP_TIMING_AVAIL)
+ printf ("Length %4zd, n %4zd, char %d, alignment %2zd/%2zd:", len, n, c, align1, align2);
+
+ FOR_EACH_IMPL (impl, 0)
+ do_one_test (impl, s2, s1, c, len, n);
+
+ if (HP_TIMING_AVAIL)
+ putchar ('\n');
+}
+
+int
+test_main (void)
+{
+ size_t i;
+
+ test_init ();
+
+ printf ("%28s", "");
+ FOR_EACH_IMPL (impl, 0)
+ printf ("\t%s", impl->name);
+ putchar ('\n');
+
+ for (i = 1; i < 8; ++i)
+ {
+ do_test (i, i, 12, 16, 16, 127);
+ do_test (i, i, 23, 16, 16, 255);
+ do_test (i, 2 * i, 28, 16, 16, 127);
+ do_test (2 * i, i, 31, 16, 16, 255);
+ do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127);
+ do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127);
+ do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255);
+ do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255);
+ }
+
+ for (i = 1; i < 8; ++i)
+ {
+ do_test (0, 0, i, 4 << i, 8 << i, 127);
+ do_test (0, 0, i, 16 << i, 8 << i, 127);
+ do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127);
+ do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127);
+ }
+
+ return ret;
+}
+
+#include "../test-skeleton.c"