aboutsummaryrefslogtreecommitdiff
path: root/benchtests/bench-memcmp.c
diff options
context:
space:
mode:
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-memcmp.c
parentc1f75dc386d533806d29b7e94118363a7b50eed8 (diff)
downloadglibc-9702047480d9002522936c5e1e1ebe16f696880d.tar
glibc-9702047480d9002522936c5e1e1ebe16f696880d.tar.gz
glibc-9702047480d9002522936c5e1e1ebe16f696880d.tar.bz2
glibc-9702047480d9002522936c5e1e1ebe16f696880d.zip
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-memcmp.c')
-rw-r--r--benchtests/bench-memcmp.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/benchtests/bench-memcmp.c b/benchtests/bench-memcmp.c
new file mode 100644
index 0000000000..053bb50567
--- /dev/null
+++ b/benchtests/bench-memcmp.c
@@ -0,0 +1,183 @@
+/* Measure memcmp 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
+#ifdef WIDE
+# define TEST_NAME "wmemcmp"
+#else
+# define TEST_NAME "memcmp"
+#endif
+#include "bench-string.h"
+#ifdef WIDE
+# include <inttypes.h>
+# include <wchar.h>
+
+# define MEMCMP wmemcmp
+# define MEMCPY wmemcpy
+# define SIMPLE_MEMCMP simple_wmemcmp
+# define CHAR wchar_t
+# define UCHAR wchar_t
+# define CHARBYTES 4
+# define CHAR__MIN WCHAR_MIN
+# define CHAR__MAX WCHAR_MAX
+int
+simple_wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n)
+{
+ int ret = 0;
+ /* Warning!
+ wmemcmp has to use SIGNED comparison for elements.
+ memcmp has to use UNSIGNED comparison for elemnts.
+ */
+ while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}
+ return ret;
+}
+#else
+# include <limits.h>
+
+# define MEMCMP memcmp
+# define MEMCPY memcpy
+# define SIMPLE_MEMCMP simple_memcmp
+# define CHAR char
+# define MAX_CHAR 255
+# define UCHAR unsigned char
+# define CHARBYTES 1
+# define CHAR__MIN CHAR_MIN
+# define CHAR__MAX CHAR_MAX
+
+int
+simple_memcmp (const char *s1, const char *s2, size_t n)
+{
+ int ret = 0;
+
+ while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
+ return ret;
+}
+#endif
+
+typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
+
+IMPL (SIMPLE_MEMCMP, 0)
+IMPL (MEMCMP, 1)
+
+static void
+do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len,
+ int exp_result)
+{
+ 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, s1, s2, len);
+ 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, size_t len, int exp_result)
+{
+ size_t i;
+ CHAR *s1, *s2;
+
+ if (len == 0)
+ return;
+
+ align1 &= 63;
+ if (align1 + (len + 1) * CHARBYTES >= page_size)
+ return;
+
+ align2 &= 63;
+ if (align2 + (len + 1) * CHARBYTES >= page_size)
+ return;
+
+ s1 = (CHAR *) (buf1 + align1);
+ s2 = (CHAR *) (buf2 + align2);
+
+ for (i = 0; i < len; i++)
+ s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
+
+ s1[len] = align1;
+ s2[len] = align2;
+ s2[len - 1] -= exp_result;
+
+ if (HP_TIMING_AVAIL)
+ printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
+
+ FOR_EACH_IMPL (impl, 0)
+ do_one_test (impl, s1, s2, len, exp_result);
+
+ if (HP_TIMING_AVAIL)
+ putchar ('\n');
+}
+
+int
+test_main (void)
+{
+ size_t i;
+
+ test_init ();
+
+ printf ("%23s", "");
+ FOR_EACH_IMPL (impl, 0)
+ printf ("\t%s", impl->name);
+ putchar ('\n');
+
+ for (i = 1; i < 16; ++i)
+ {
+ do_test (i * CHARBYTES, i * CHARBYTES, i, 0);
+ do_test (i * CHARBYTES, i * CHARBYTES, i, 1);
+ do_test (i * CHARBYTES, i * CHARBYTES, i, -1);
+ }
+
+ for (i = 0; i < 16; ++i)
+ {
+ do_test (0, 0, i, 0);
+ do_test (0, 0, i, 1);
+ do_test (0, 0, i, -1);
+ }
+
+ for (i = 1; i < 10; ++i)
+ {
+ do_test (0, 0, 2 << i, 0);
+ do_test (0, 0, 2 << i, 1);
+ do_test (0, 0, 2 << i, -1);
+ do_test (0, 0, 16 << i, 0);
+ do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
+ do_test (0, 0, 16 << i, 1);
+ do_test (0, 0, 16 << i, -1);
+ }
+
+ for (i = 1; i < 8; ++i)
+ {
+ do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
+ do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
+ do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1);
+ }
+
+ return ret;
+}
+#include "../test-skeleton.c"