[PATCH v1] Benchtest: Add additional benchmarks for strlen and strnlen

[Noah Goldstein]

Current benchmarks are missing many cases in the mid-length range
which is often the hottest size range.
---
 benchtests/bench-strlen.c  | 33 ++++++++++++++++++++---
 benchtests/bench-strnlen.c | 55 +++++++++++++++++++++++++++++++++++---
 2 files changed, 81 insertions(+), 7 deletions(-)

diff --git a/benchtests/bench-strlen.c b/benchtests/bench-strlen.c
index 602e52ee83..696e4541d7 100644
--- a/benchtests/bench-strlen.c
+++ b/benchtests/bench-strlen.c
@@ -128,10 +128,10 @@ test_main (void)
   /* Checking with only 4 * N alignments for wcslen, other alignments are wrong for wchar_t type arrays*/
 
   for (i = 1; i < 8; ++i)
-  {
-    do_test (&json_ctx, sizeof (CHAR) * i, i);
-    do_test (&json_ctx, 0, i);
-  }
+    {
+      do_test (&json_ctx, sizeof (CHAR) * i, i);
+      do_test (&json_ctx, 0, i);
+    }
 
   for (i = 2; i <= 12; ++i)
     {
@@ -141,6 +141,31 @@ test_main (void)
       do_test (&json_ctx, sizeof (CHAR) * i, (size_t)((1 << i) / 1.5));
     }
 
+  for (i = 0; i < 512; i += 32)
+    {
+      do_test (&json_ctx, 0, i / sizeof (CHAR));
+    }
+
+  for (i = 512; i < 1024; i += 64)
+    {
+      do_test (&json_ctx, 0, i / sizeof (CHAR));
+    }
+
+  for (i = 1024; i < 2048; i += 128)
+    {
+      do_test (&json_ctx, 0, i / sizeof (CHAR));
+    }
+
+  for (i = 2048; i < 4096; i += 256)
+    {
+      do_test (&json_ctx, 0, i / sizeof (CHAR));
+    }
+
+  for (i = 4096; i < 8192; i += 512)
+    {
+      do_test (&json_ctx, 0, i / sizeof (CHAR));
+    }
+
   json_array_end (&json_ctx);
   json_attr_object_end (&json_ctx);
   json_attr_object_end (&json_ctx);
diff --git a/benchtests/bench-strnlen.c b/benchtests/bench-strnlen.c
index 2cd561dfd5..13b46b3f57 100644
--- a/benchtests/bench-strnlen.c
+++ b/benchtests/bench-strnlen.c
@@ -63,6 +63,11 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, size_t maxlen,
       ret = 1;
       return;
     }
+  /* Warmup.  */
+  for (i = 0; i < iters / 16; ++i)
+    {
+      CALL (impl, s, maxlen);
+    }
 
   TIMING_NOW (start);
   for (i = 0; i < iters; ++i)
@@ -110,7 +115,7 @@ do_test (json_ctx_t *json_ctx, size_t align, size_t len, size_t maxlen,
 int
 test_main (void)
 {
-  size_t i;
+  size_t i, j;
   json_ctx_t json_ctx;
 
   test_init ();
@@ -131,6 +136,19 @@ test_main (void)
 
   json_array_begin (&json_ctx, "results");
 
+  for (i = 0; i <= 1; ++i)
+    {
+      do_test (&json_ctx, i, 1, 128, MIDDLE_CHAR);
+      do_test (&json_ctx, i, 128, 1, MIDDLE_CHAR);
+      do_test (&json_ctx, i, 1, 2, MIDDLE_CHAR);
+      do_test (&json_ctx, i, 2, 1, MIDDLE_CHAR);
+
+      do_test (&json_ctx, 32 + i, 1, 128, MIDDLE_CHAR);
+      do_test (&json_ctx, 32 + i, 128, 1, MIDDLE_CHAR);
+      do_test (&json_ctx, 32 + i, 1, 2, MIDDLE_CHAR);
+      do_test (&json_ctx, 32 + i, 2, 1, MIDDLE_CHAR);
+    }
+
   for (i = 1; i < 8; ++i)
     {
       do_test (&json_ctx, 0, i, i - 1, MIDDLE_CHAR);
@@ -149,18 +167,49 @@ test_main (void)
     {
       do_test (&json_ctx, 0, 1 << i, 5000, MIDDLE_CHAR);
       do_test (&json_ctx, 1, 1 << i, 5000, MIDDLE_CHAR);
+      do_test (&json_ctx, 0, 5000, 1 << i, MIDDLE_CHAR);
+      do_test (&json_ctx, 1, 5000, 1 << i, MIDDLE_CHAR);
     }
 
   for (i = 1; i < 8; ++i)
-    do_test (&json_ctx, 0, i, 5000, BIG_CHAR);
+    {
+      do_test (&json_ctx, 0, i, 5000, BIG_CHAR);
+      do_test (&json_ctx, 0, 5000, i, BIG_CHAR);
+    }
 
   for (i = 1; i < 8; ++i)
-    do_test (&json_ctx, i, i, 5000, BIG_CHAR);
+    {
+      do_test (&json_ctx, i, i, 5000, BIG_CHAR);
+      do_test (&json_ctx, i, 5000, i, BIG_CHAR);
+    }
 
   for (i = 2; i <= 10; ++i)
     {
       do_test (&json_ctx, 0, 1 << i, 5000, BIG_CHAR);
       do_test (&json_ctx, 1, 1 << i, 5000, BIG_CHAR);
+      do_test (&json_ctx, 0, 5000, 1 << i, BIG_CHAR);
+      do_test (&json_ctx, 1, 5000, 1 << i, BIG_CHAR);
+    }
+
+  for (i = (16 / sizeof (CHAR)); i <= (8192 / sizeof (CHAR)); i += i)
+    {
+      for (j = 0; j <= (704 / sizeof (CHAR)); j += (32 / sizeof (CHAR)))
+	{
+	  do_test (&json_ctx, 0, 1 << i, (i + j), BIG_CHAR);
+	  do_test (&json_ctx, 0, i + j, i, BIG_CHAR);
+
+	  do_test (&json_ctx, 64, 1 << i, (i + j), BIG_CHAR);
+	  do_test (&json_ctx, 64, i + j, i, BIG_CHAR);
+
+	  if (j < i)
+	    {
+	      do_test (&json_ctx, 0, 1 << i, i - j, BIG_CHAR);
+	      do_test (&json_ctx, 0, i - j, i, BIG_CHAR);
+
+	      do_test (&json_ctx, 64, 1 << i, i - j, BIG_CHAR);
+	      do_test (&json_ctx, 64, i - j, i, BIG_CHAR);
+	    }
+	}
     }
 
   json_array_end (&json_ctx);
-- 
2.34.1