benchtests: Add strsep benchmark

1 files changed, 174 insertions, 0 deletions

diff --git a/benchtests/bench-strsep.c b/benchtests/bench-strsep.c
new file mode 100644
index 0000000000..59dbe04555
--- /dev/null
+++ b/benchtests/bench-strsep.c
@@ -0,0 +1,174 @@
+/* Measure strsep 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 "strsep"
+#include "bench-string.h"
+
+char *
+simple_strsep (char **s1, char *s2)
+{
+  char *begin;
+  char *s;
+  size_t j = 0;
+
+  begin = *s1;
+  s = begin;
+  if (begin == NULL)
+    return NULL;
+  ssize_t s2len = strlen (s2);
+  while (*s)
+    {
+      for (j = 0; j < s2len; j++)
+	{
+	  if (*s == s2[j])
+	    {
+	      s[0] = '\0';
+	      *s1 = s + 1;
+	      return begin;
+	    }
+	}
+      s++;
+    }
+  *s1 = NULL;
+  return begin;
+}
+
+typedef char *(*proto_t) (const char **, const char *);
+
+IMPL (simple_strsep, 0)
+IMPL (strsep, 1)
+
+static void
+do_one_test (impl_t * impl, const char *s1, const char *s2)
+{
+  size_t i, iters = INNER_LOOP_ITERS;
+  timing_t start, stop, cur;
+
+  TIMING_NOW (start);
+  for (i = 0; i < iters; ++i)
+    {
+      CALL (impl, &s1, s2);
+    }
+  TIMING_NOW (stop);
+
+  TIMING_DIFF (cur, start, stop);
+
+  TIMING_PRINT_MEAN ((double) cur, (double) iters);
+}
+
+static void
+do_test (size_t align1, size_t align2, size_t len1, size_t len2, int fail)
+{
+  char *s2 = (char *) (buf2 + align2);
+  static const char d[] = "1234567890abcdef";
+#define dl (sizeof (d) - 1)
+  char *ss2 = s2;
+  for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
+    {
+      size_t t = l > dl ? dl : l;
+      ss2 = mempcpy (ss2, d, t);
+    }
+  s2[len2] = '\0';
+
+  printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
+	  len1, len2, align1, align2, fail ? "fail" : "found");
+
+  FOR_EACH_IMPL (impl, 0)
+  {
+    char *s1 = (char *) (buf1 + align1);
+    if (fail)
+      {
+	char *ss1 = s1;
+	for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
+	  {
+	    size_t t = l > dl ? dl : l;
+	    memcpy (ss1, d, t);
+	    ++ss1[len2 > 7 ? 7 : len2 - 1];
+	    ss1 += t;
+	  }
+      }
+    else
+      {
+	memset (s1, '0', len1);
+	memcpy (s1 + (len1 - len2) - 2, s2, len2);
+	if ((len1 / len2) > 4)
+	  memcpy (s1 + (len1 - len2) - (3 * len2), s2, len2);
+      }
+    s1[len1] = '\0';
+    do_one_test (impl, s1, s2);
+  }
+  putchar ('\n');
+}
+
+static int
+test_main (void)
+{
+  test_init ();
+
+  printf ("%23s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+  for (size_t klen = 2; klen < 32; ++klen)
+    for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
+      {
+	do_test (0, 0, hlen, klen, 0);
+	do_test (0, 0, hlen, klen, 1);
+	do_test (0, 3, hlen, klen, 0);
+	do_test (0, 3, hlen, klen, 1);
+	do_test (0, 9, hlen, klen, 0);
+	do_test (0, 9, hlen, klen, 1);
+	do_test (0, 15, hlen, klen, 0);
+	do_test (0, 15, hlen, klen, 1);
+
+	do_test (3, 0, hlen, klen, 0);
+	do_test (3, 0, hlen, klen, 1);
+	do_test (3, 3, hlen, klen, 0);
+	do_test (3, 3, hlen, klen, 1);
+	do_test (3, 9, hlen, klen, 0);
+	do_test (3, 9, hlen, klen, 1);
+	do_test (3, 15, hlen, klen, 0);
+	do_test (3, 15, hlen, klen, 1);
+
+	do_test (9, 0, hlen, klen, 0);
+	do_test (9, 0, hlen, klen, 1);
+	do_test (9, 3, hlen, klen, 0);
+	do_test (9, 3, hlen, klen, 1);
+	do_test (9, 9, hlen, klen, 0);
+	do_test (9, 9, hlen, klen, 1);
+	do_test (9, 15, hlen, klen, 0);
+	do_test (9, 15, hlen, klen, 1);
+
+	do_test (15, 0, hlen, klen, 0);
+	do_test (15, 0, hlen, klen, 1);
+	do_test (15, 3, hlen, klen, 0);
+	do_test (15, 3, hlen, klen, 1);
+	do_test (15, 9, hlen, klen, 0);
+	do_test (15, 9, hlen, klen, 1);
+	do_test (15, 15, hlen, klen, 0);
+	do_test (15, 15, hlen, klen, 1);
+      }
+  do_test (0, 0, page_size - 1, 16, 0);
+  do_test (0, 0, page_size - 1, 16, 1);
+
+  return ret;
+}
+
+#include "../test-skeleton.c"