benchtests: Reallocate buffers for every test run

Keeping the buffers the same across test runs gives later invocations
the advantage since they access cached data.  Reallocate so that all
test runs are on equal grounds.

	* benchtests/bench-memcmp.c (do_test): Call realloc_buf for
	every test run.

diff --git a/ChangeLog b/ChangeLog
index 480090e720d6202d2019cf014a469cff55dcc602..4362a79893e3a795a4ad12ecc587a1f87b258b89 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2018-02-02  Siddhesh Poyarekar  <siddhesh@sourceware.org>
+
+       * benchtests/bench-memcmp.c (do_test): Call realloc_buf for
+       every test run.
+
 2018-02-01  Joseph Myers  <joseph@codesourcery.com>
 
        * sysdeps/unix/sysv/linux/syscall-names.list: Update kernel

diff --git a/benchtests/bench-memcmp.c b/benchtests/bench-memcmp.c
index 38cbdf8d5a8242dda5a56d7d877bf55489881824..c7255a5b0eb6b49974a2e0e952c25b9e86cf81fa 100644 (file)
--- a/benchtests/bench-memcmp.c
+++ b/benchtests/bench-memcmp.c
@@ -110,20 +110,23 @@ do_test (size_t align1, size_t align2, size_t len, int exp_result)
   if (align2 + (len + 1) * CHARBYTES >= page_size)
     return;
 
-  s1 = (CHAR *) (buf1 + align1);
-  s2 = (CHAR *) (buf2 + align2);
+  printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 
-  for (i = 0; i < len; i++)
-    s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
+  FOR_EACH_IMPL (impl, 0)
+    {
+      s1 = (CHAR *) (buf1 + align1);
+      s2 = (CHAR *) (buf2 + align2);
 
-  s1[len] = align1;
-  s2[len] = align2;
-  s2[len - 1] -= exp_result;
+      for (i = 0; i < len; i++)
+       s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
 
-  printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
+      s1[len] = align1;
+      s2[len] = align2;
+      s2[len - 1] -= exp_result;
 
-  FOR_EACH_IMPL (impl, 0)
-    do_one_test (impl, s1, s2, len, exp_result);
+      do_one_test (impl, s1, s2, len, exp_result);
+      realloc_bufs ();
+    }
 
   putchar ('\n');
 }