Merge changes between r23217 and r23296 from /fsf/trunk.

git-svn-id: svn://svn.eglibc.org/trunk@23297 7b3dc134-2b1b-0410-93df-9e9f96275f8d

1 files changed, 169 insertions, 0 deletions

diff --git a/libc/benchtests/bench-memccpy.c b/libc/benchtests/bench-memccpy.c
new file mode 100644
index 000000000..612513c68
--- /dev/null
+++ b/libc/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"