test: add unit test for integer log2 function

add a unit testcase for rte_log2_u32.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Reviewed-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/test/test/test_common.c b/test/test/test_common.c
index 6e803f5..ae3482d 100644 (file)
--- a/test/test/test_common.c
+++ b/test/test/test_common.c
@@ -33,6 +33,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <math.h>
 #include <rte_common.h>
 #include <rte_hexdump.h>
 #include <rte_pause.h>
@@ -159,6 +160,25 @@ test_align(void)
        return 0;
 }
 
+static int
+test_log2(void)
+{
+       uint32_t i, base, compare;
+       const uint32_t max = 0x10000;
+       const uint32_t step = 1;
+
+       for (i = 0; i < max; i = i + step) {
+               base = (uint32_t)ceilf(log2((uint32_t)i));
+               compare = rte_log2_u32(i);
+               if (base != compare) {
+                       printf("Wrong rte_log2_u32(%x) val %x, expected %x\n",
+                               i, compare, base);
+                       return TEST_FAILED;
+               }
+       }
+       return 0;
+}
+
 static int
 test_common(void)
 {
@@ -166,6 +186,7 @@ test_common(void)
        ret |= test_align();
        ret |= test_macros(0);
        ret |= test_misc();
+       ret |= test_log2();
 
        return ret;
 }