avcodec: add mathops test

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/Makefile

@@ -883,6 +883,7 @@ SKIPHEADERS-$(CONFIG_VDA)              += vda.h vda_internal.h
 SKIPHEADERS-$(CONFIG_VDPAU)            += vdpau.h vdpau_internal.h
 
 TESTPROGS = imgconvert                                                  \
+            mathops                                                    \
             options                                                     \
             avfft                                                       \
 

libavcodec/mathops.c

+#include "mathops.h"
+
+#ifdef TEST
+
+#include <stdlib.h>
+
+int main(void)
+{
+    unsigned u;
+
+    for(u=0; u<65536; u++) {
+        unsigned s = u*u;
+        unsigned root = ff_sqrt(s);
+        unsigned root_m1 = ff_sqrt(s-1);
+        if (s && root != u) {
+            fprintf(stderr, "ff_sqrt failed at %u with %u\n", s, root);
+            return 1;
+        }
+        if (u && root_m1 != u - 1) {
+            fprintf(stderr, "ff_sqrt failed at %u with %u\n", s, root);
+            return 1;
+        }
+    }
+    return 0;
+}
+#endif /* TEST */