On Fri, Aug 17, 2007 at 06:02:06PM +0200, Rask Ingemann Lambertsen wrote:
> What happened to the experiments you described at
> <URL:http://gcc.gnu.org/ml/gcc/2004-06/msg01178.html>? Emitting a no-op move
> of the (set (reg) (reg)) form won't work, but maybe something like
>
> (insn (use (reg) (expr_list:REG_EQUAL ...)))
>
> would work?
And if not, the required no-op move pattern could look like this:
(define_insn "*no-op-move"
[(set (match_operand 0 "register_operand")
(match_dup 0))]
"REG_P (operands[0])
&& !reload_completed"
{
gcc_abort ();
}
Reload will delete such an insn even at -O0.
--
Rask Ingemann Lambertsen
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