2014-05-07 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
+ 2013-09-30 Jakub Jelinek <jakub@redhat.com>
+
+ PR middle-end/58564
+ * fold-const.c (fold_ternary_loc): For A < 0 : <sign bit of A> : 0
+ optimization, punt if sign_bit_p looked through any zero extension.
+
2013-09-10 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/58365
&& integer_zerop (op2)
&& (tem = sign_bit_p (TREE_OPERAND (arg0, 0), arg1)))
{
+ /* sign_bit_p looks through both zero and sign extensions,
+ but for this optimization only sign extensions are
+ usable. */
+ tree tem2 = TREE_OPERAND (arg0, 0);
+ while (tem != tem2)
+ {
+ if (TREE_CODE (tem2) != NOP_EXPR
+ || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (tem2, 0))))
+ {
+ tem = NULL_TREE;
+ break;
+ }
+ tem2 = TREE_OPERAND (tem2, 0);
+ }
/* sign_bit_p only checks ARG1 bits within A's precision.
If <sign bit of A> has wider type than A, bits outside
of A's precision in <sign bit of A> need to be checked.
If they are all 0, this optimization needs to be done
in unsigned A's type, if they are all 1 in signed A's type,
otherwise this can't be done. */
- if (TYPE_PRECISION (TREE_TYPE (tem))
- < TYPE_PRECISION (TREE_TYPE (arg1))
+ if (tem
+ && TYPE_PRECISION (TREE_TYPE (tem))
+ < TYPE_PRECISION (TREE_TYPE (arg1))
&& TYPE_PRECISION (TREE_TYPE (tem))
< TYPE_PRECISION (type))
{
2014-05-07 Jakub Jelinek <jakub@redhat.com>
Backported from mainline
+ 2013-09-30 Jakub Jelinek <jakub@redhat.com>
+
+ PR middle-end/58564
+ * gcc.c-torture/execute/pr58564.c: New test.
+
2013-09-10 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/58365