[PATCH] benchtests: Add memrchr

[Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>]

Hi all,

This patch adds a memrchr benchmark based on existing memchr code.

---

2013-09-05  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>

	* benchtests/Makefile: Add memrchr benchmark.
	* benchtests/bench-memchr.c (USE_AS_MEMRCHR): Add define to use
	benchmark as memrchr.
	* benchtests/bench-memrchr-ifunc.c: New file.
	* benchtests/bench-memrchr.c: New file.

--

diff --git a/benchtests/Makefile b/benchtests/Makefile
index 4d4b909..33c3eeb 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -28,7 +28,7 @@ string-bench := bcopy bzero memccpy memchr memcmp memmem memmove mempcpy \
 		memset rawmemchr stpcpy stpncpy strcasecmp strcasestr strcat \
 		strchr strchrnul strcmp strcpy strcspn strlen strncasecmp \
 		strncat strncmp strncpy strnlen strpbrk strrchr strspn strstr \
-		strcpy_chk stpcpy_chk
+		strcpy_chk stpcpy_chk memrchr
 string-bench-ifunc := $(addsuffix -ifunc, $(string-bench))
 string-bench-all := $(string-bench) $(string-bench-ifunc)
 
diff --git a/benchtests/bench-memchr.c b/benchtests/bench-memchr.c
index db099ad..30c472c 100644
--- a/benchtests/bench-memchr.c
+++ b/benchtests/bench-memchr.c
@@ -16,9 +16,10 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#define TEST_MAIN
-#define TEST_NAME "memchr"
-#include "bench-string.h"
+#ifndef USE_AS_MEMRCHR
+# define TEST_MAIN
+# define TEST_NAME "memchr"
+# include "bench-string.h"
 
 typedef char *(*proto_t) (const char *, int, size_t);
 char *simple_memchr (const char *, int, size_t);
@@ -34,6 +35,7 @@ simple_memchr (const char *s, int c, size_t n)
       return (char *) s - 1;
   return NULL;
 }
+#endif
 
 static void
 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
diff --git a/benchtests/bench-memrchr-ifunc.c b/benchtests/bench-memrchr-ifunc.c
new file mode 100644
index 0000000..fff8f01
--- /dev/null
+++ b/benchtests/bench-memrchr-ifunc.c
@@ -0,0 +1,20 @@
+/* Measure IFUNC implementations of memrchr function.
+   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_IFUNC 1
+#include "bench-memrchr.c"
diff --git a/benchtests/bench-memrchr.c b/benchtests/bench-memrchr.c
new file mode 100644
index 0000000..96a597f
--- /dev/null
+++ b/benchtests/bench-memrchr.c
@@ -0,0 +1,40 @@
+/* Measure memrchr 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 "memrchr"
+#include "bench-string.h"
+
+typedef char *(*proto_t) (const char *, int, size_t);
+char *simple_memrchr (const char *, int, size_t);
+
+IMPL (simple_memrchr, 0)
+IMPL (memrchr, 1)
+
+char *
+simple_memrchr (const char *s, int c, size_t n)
+{
+  s = s + n;
+  while (n--)
+    if (*--s == (char) c)
+      return (char *) s;
+  return NULL;
+}
+
+#define USE_AS_MEMRCHR
+#include "bench-memchr.c"