string: Fix UB on tesf-ffs

UBSAN: Undefined behaviour in test-ffs.c:48:3 left shift of 1 by 31 cannot be represented in type 'int'

diff --git a/string/test-ffs.c b/string/test-ffs.c
index 3493cca421f9acf0ebaae6bfe0e606891897c9c5..db4f64f96ef56fb3bab0ca5242774fb2269c8b8a 100644 (file)
--- a/string/test-ffs.c
+++ b/string/test-ffs.c
@@ -40,9 +40,10 @@ do_test (void)
 #define TEST(fct, type) \
   try (#fct, 0, fct ((type) 0), 0);                                          \
   for (i=0 ; i < 8 * sizeof (type); i++)                                     \
-    try (#fct, 1ll << i, fct (((type) 1) << i), i + 1);                              \
+    try (#fct, 1ull << i, fct (((unsigned type) 1) << i), i + 1);            \
   for (i=0 ; i < 8 * sizeof (type) ; i++)                                    \
-    try (#fct, (~((type) 0) >> i) << i, fct ((~((type) 0) >> i) << i), i + 1);\
+    try (#fct, (~((unsigned type) 0) >> i) << i,                             \
+        fct ((~((unsigned type) 0) >> i) << i), i + 1);\
   try (#fct, 0x80008000, fct ((type) 0x80008000), 16)
 
   TEST (ffs, int);