when testing benchmarks of string operations, a user specified alignment

is taken into account

diff --git a/lib/str-test.c b/lib/str-test.c
index adac0fb81d8660409d16eb863a7025c94b51ef41..a8bd45e2e6252284cbe753767726112b475f39cb 100644 (file)
--- a/lib/str-test.c
+++ b/lib/str-test.c
@@ -13,6 +13,9 @@
 /* It will be divided by (10 + strlen()).  */
 #define TEST_TIME      1000000
 
+/* The shift of the string according to the alignment.  */
+static uns alignment = 0;
+
 static void
 random_string(char *str, int len)
 {
@@ -34,7 +37,7 @@ elapsed_time(void)
 }
 
 int
-main(void)
+main(int argc, char **argv)
 {
        char *strings[] = {
                "",
@@ -70,6 +73,9 @@ main(void)
                -1
        };
        int i;
+       if (argc > 1)
+               alignment = atoi(argv[1]);
+       printf("Alignment set to %d\n", alignment);
        for (i=0; strings[i]; i++)
                if (strlen(strings[i]) != str_len(strings[i]))
                        die("Internal error on string %d", i);
@@ -78,22 +84,22 @@ main(void)
                printf("hash %2d = %08x\n", i, str_hash(strings[i]));
        for (i=0; lengths[i] >= 0; i++)
        {
-               char str[lengths[i] + 1];
+               char str[lengths[i] + 1 + alignment];
                uns count = TEST_TIME / (lengths[i] + 10);
                uns el1 = 0, el2 = 0, elh = 0;
                uns tot1 = 0, tot2 = 0, hash = 0;
                uns j;
                for (j=0; j<count; j++)
                {
-                       random_string(str, lengths[i]);
+                       random_string(str + alignment, lengths[i]);
                        elapsed_time();
                        /* Avoid "optimizing" by gcc, since the functions are
                         * attributed as ((const)).  */
-                       tot1 += strlen(str);
+                       tot1 += strlen(str + alignment);
                        el1 += elapsed_time();
-                       tot2 += str_len(str);
+                       tot2 += str_len(str + alignment);
                        el2 += elapsed_time();
-                       hash ^= str_hash(str);
+                       hash ^= str_hash(str + alignment);
                        elh += elapsed_time();
                }
                if (tot1 != tot2)