Fix lrot.c: Shifting by the width of the left operand results in undefined behaviour.

[r21464]

diff --git a/ir/be/test/lrot.c b/ir/be/test/lrot.c
index 2bc7247..737581d 100644 (file)
--- a/ir/be/test/lrot.c
+++ b/ir/be/test/lrot.c
@@ -6,11 +6,11 @@
 #define ROR(a,b) (((a) >> (b)) | ((a) << ((sizeof (a) * CHAR_BIT) - (b))))
 
 unsigned long long testL(unsigned long long a, int cnt) {
-       return ROL(a, cnt);
+       return cnt == 0 ? a : ROL(a, cnt);
 }
 
 unsigned long long testR(unsigned long long a, int cnt) {
-       return ROR(a, cnt);
+       return cnt == 0 ? a : ROR(a, cnt);
 }
 
 int main() {