On Tue, Nov 19, 2013 at 5:43 PM, Richard Earnshaw wrote:
> PR 54300 is a problem in regcprop where the compiler sees
> (parallel [(set (x) (y)
> (set (y) (x)]) (REG_UNUSED (y))
>
> as a single-set insn (since the other operand, y, is not used) and
> replaces a use of x with a use of y. However, it fails to take into
> account that y has been clobbered in the insn itself.
Ah, wait. Incorrect use of single_set().
Try
------
}
- set = single_set (insn);
+ set = multiple_sets (insn) ? NULL_RTX : single_set (insn);
extract_insn (insn);
if (! constrain_operands (1))
fatal_insn_not_found (insn);
preprocess_constraints ();
------
Ciao!
Steven
