(operand_equal_p): Constants are not equal if there has been an overflow.

From-SVN: r13949

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index f75d479637e9b0d335383fc6e8761407960460e0..84e098a6c158dd1c1216372a0bd71ae0a48f7e2f 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1759,11 +1759,16 @@ operand_equal_p (arg0, arg1, only_const)
     switch (TREE_CODE (arg0))
       {
       case INTEGER_CST:
-       return (TREE_INT_CST_LOW (arg0) == TREE_INT_CST_LOW (arg1)
+       return (! TREE_CONSTANT_OVERFLOW (arg0)
+               && ! TREE_CONSTANT_OVERFLOW (arg1)
+               && TREE_INT_CST_LOW (arg0) == TREE_INT_CST_LOW (arg1)
                && TREE_INT_CST_HIGH (arg0) == TREE_INT_CST_HIGH (arg1));
 
       case REAL_CST:
-       return REAL_VALUES_EQUAL (TREE_REAL_CST (arg0), TREE_REAL_CST (arg1));
+       return (! TREE_CONSTANT_OVERFLOW (arg0)
+               && ! TREE_CONSTANT_OVERFLOW (arg1)
+               && REAL_VALUES_EQUAL (TREE_REAL_CST (arg0),
+                                     TREE_REAL_CST (arg1)));
 
       case COMPLEX_CST:
        return (operand_equal_p (TREE_REALPART (arg0), TREE_REALPART (arg1),