benchtests: Switch string benchmarks to use bench-timing.h.

Switch the string benchmarks to using bench-timing.h instead
of hp-timing.h directly. This allows the string benchmarks to
be run usefully on architectures such as ARM that do not have
support for hp-timing.h.

In order to do this the tests have been changed from timing each
individual call and picking the lowest execution time recorded to
timing a number of calls and taking the mean execution time.

ChangeLog:

2013-09-04   Will Newton  <will.newton@linaro.org>

	* benchtests/bench-timing.h (TIMING_PRINT_MEAN): New macro.
	* benchtests/bench-string.h: Include bench-timing.h instead
	of including hp-timing.h directly. (INNER_LOOP_ITERS): New
	define. (HP_TIMING_BEST): Delete macro. (test_init): Remove
	call to HP_TIMING_DIFF_INIT.
	* benchtests/bench-memccpy.c: Use bench-timing.h macros
	instead of hp-timing.h macros.
	* benchtests/bench-memchr.c: Likewise.
	* benchtests/bench-memcmp.c: Likewise.
	* benchtests/bench-memcpy.c: Likewise.
	* benchtests/bench-memmem.c: Likewise.
	* benchtests/bench-memmove.c: Likewise.
	* benchtests/bench-memset.c: Likewise.
	* benchtests/bench-rawmemchr.c: Likewise.
	* benchtests/bench-strcasecmp.c: Likewise.
	* benchtests/bench-strcasestr.c: Likewise.
	* benchtests/bench-strcat.c: Likewise.
	* benchtests/bench-strchr.c: Likewise.
	* benchtests/bench-strcmp.c: Likewise.
	* benchtests/bench-strcpy.c: Likewise.
	* benchtests/bench-strcpy_chk.c: Likewise.
	* benchtests/bench-strlen.c: Likewise.
	* benchtests/bench-strncasecmp.c: Likewise.
	* benchtests/bench-strncat.c: Likewise.
	* benchtests/bench-strncmp.c: Likewise.
	* benchtests/bench-strncpy.c: Likewise.
	* benchtests/bench-strnlen.c: Likewise.
	* benchtests/bench-strpbrk.c: Likewise.
	* benchtests/bench-strrchr.c: Likewise.
	* benchtests/bench-strspn.c: Likewise.
	* benchtests/bench-strstr.c: Likewise.

1 files changed, 12 insertions, 19 deletions

diff --git a/benchtests/bench-strcasecmp.c b/benchtests/bench-strcasecmp.c
index 27250bb447..1458df1e94 100644
--- a/benchtests/bench-strcasecmp.c
+++ b/benchtests/bench-strcasecmp.c
@@ -62,6 +62,8 @@ stupid_strcasecmp (const char *s1, const char *s2)
 static void
 do_one_test (impl_t *impl, const char *s1, const char *s2, int exp_result)
 {
+  size_t i, iters = INNER_LOOP_ITERS;
+  timing_t start, stop, cur;
   int result = CALL (impl, s1, s2);
   if ((exp_result == 0 && result != 0)
       || (exp_result < 0 && result >= 0)
@@ -73,23 +75,16 @@ do_one_test (impl_t *impl, const char *s1, const char *s2, int exp_result)
       return;
     }
 
-  if (HP_TIMING_AVAIL)
+  TIMING_NOW (start);
+  for (i = 0; i < iters; ++i)
     {
-      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);
-	  HP_TIMING_NOW (stop);
-	  HP_TIMING_BEST (best_time, start, stop);
-	}
-
-      printf ("\t%zd", (size_t) best_time);
+      CALL (impl, s1, s2);
     }
+  TIMING_NOW (stop);
+
+  TIMING_DIFF (cur, start, stop);
+
+  TIMING_PRINT_MEAN ((double) cur, (double) iters);
 }
 
 static void
@@ -128,14 +123,12 @@ do_test (size_t align1, size_t align2, size_t len, int max_char,
   else
     s2[len - 1] -= exp_result;
 
-  if (HP_TIMING_AVAIL)
-    printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
+  printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 
   FOR_EACH_IMPL (impl, 0)
     do_one_test (impl, s1, s2, exp_result);
 
-  if (HP_TIMING_AVAIL)
-    putchar ('\n');
+  putchar ('\n');
 }
 
 int