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.

1 files changed, 183 insertions, 0 deletions

diff --git a/benchtests/bench-memcmp.c b/benchtests/bench-memcmp.c
new file mode 100644
index 0000000..053bb50
--- /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"