The following patch fixes usage of an uninitialized value in
record_operand_costs:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58712
The single set insn might have less 2 operands, e.g. x86_fnstcw_1.
Committed as rev. 204720.
2013-11-12 Vladimir Makarov <vmaka...@redhat.com>
PR other/58712
* ira-costs.c (record_operand_costs): Check operands number for
the single set.
Index: ira-costs.c
===================================================================
--- ira-costs.c (revision 204594)
+++ ira-costs.c (working copy)
@@ -1224,6 +1224,9 @@ record_operand_costs (rtx insn, enum reg
preferred class is very expensive as the source of a copy
instruction. */
if ((set = single_set (insn)) != NULL_RTX
+ /* In rare cases the single set insn might have less 2 operands
+ as the source can be a fixed special reg. */
+ && recog_data.n_operands > 1
&& ops[0] == SET_DEST (set) && ops[1] == SET_SRC (set))
{
int regno, other_regno;
