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lra: A multiple_sets is not a simple_move_p (PR73650)

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In the PR we have a PARALLEL of a move and a compare (a "mr." instruction).
The compare is dead, so single_set on it returns just the move.  Then,
simple_move_p returns true; but the instruction does need reloads in this
case.  This patch solves this by making simple_move_p return false for
every multiple_sets instruction.


	PR rtl-optimization/73650
	* lra-constraints.c (simple_move_p): If the insn is multiple_sets
	it is not a simple move.

From-SVN: r239483
This commit is contained in:
Segher Boessenkool 2016-08-15 18:17:21 +02:00 committed by Segher Boessenkool
parent 5c578ae434
commit 2008be405c
2 changed files with 13 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-08-15 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/73650
* lra-constraints.c (simple_move_p): If the insn is multiple_sets
it is not a simple move.
2016-08-15 Martin Liska <mliska@suse.cz>
PR driver/72765

7
gcc/lra-constraints.c
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@ -3493,6 +3493,13 @@ simple_move_p (void)
lra_assert (curr_insn_set != NULL_RTX);
dest = SET_DEST (curr_insn_set);
src = SET_SRC (curr_insn_set);
/* If the instruction has multiple sets we need to process it even if it
is single_set. This can happen if one or more of the SETs are dead.
See PR73650. */
if (multiple_sets (curr_insn))
return false;
return ((dclass = get_op_class (dest)) != NO_REGS
&& (sclass = get_op_class (src)) != NO_REGS
/* The backend guarantees that register moves of cost 2