+2004-03-07 Roger Sayle <roger@eyesopen.com>
+
+ * fold-const.c (fold) <IOR_EXPR>: Fold x | x as x.
+ <XOR_EXPR>: Fold x ^ x as zero.
+ <AND_EXPR>: Fold x & x as x.
+
2004-03-07 Roger Sayle <roger@eyesopen.com>
* fold-const.c (fold) <EQ_EXPR>: Rewrite optimization to transform
return omit_one_operand (type, arg1, arg0);
if (integer_zerop (arg1))
return non_lvalue (fold_convert (type, arg0));
+ if (operand_equal_p (arg0, arg1, 0))
+ return non_lvalue (fold_convert (type, arg0));
t1 = distribute_bit_expr (code, type, arg0, arg1);
if (t1 != NULL_TREE)
return t1;
return non_lvalue (fold_convert (type, arg0));
if (integer_all_onesp (arg1))
return fold (build1 (BIT_NOT_EXPR, type, arg0));
+ if (operand_equal_p (arg0, arg1, 0))
+ return omit_one_operand (type, integer_zero_node, arg0);
/* If we are XORing two BIT_AND_EXPR's, both of which are and'ing
with a constant, and the two constants have no bits in common,
return non_lvalue (fold_convert (type, arg0));
if (integer_zerop (arg1))
return omit_one_operand (type, arg1, arg0);
+ if (operand_equal_p (arg0, arg1, 0))
+ return non_lvalue (fold_convert (type, arg0));
t1 = distribute_bit_expr (code, type, arg0, arg1);
if (t1 != NULL_TREE)
return t1;