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re PR tree-optimization/63798 (FAIL: gcc.target/powerpc/ppc-fmadd-1.c scan-assembler-not f(add|sub|mul|neg))

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2014-11-10  Richard Biener  <rguenther@suse.de>

	PR middle-end/63798
	* expr.c (expand_expr_real_2): When expanding FMA_EXPRs
	properly treat the embedded multiplication as commutative
	when looking for feeding negates.

From-SVN: r217287
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Richard Biener 2014-11-10 14:06:56 +00:00 • committed by Richard Biener
parent 27be769ce5
commit 3090fa556b
2 changed files with 20 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2014-11-10 Richard Biener <rguenther@suse.de>
PR middle-end/63798
* expr.c (expand_expr_real_2): When expanding FMA_EXPRs
properly treat the embedded multiplication as commutative
when looking for feeding negates.
2014-11-10 Joern Rennecke <joern.rennecke@embecosm.com>
* config/avr/avr.h (CPLUSPLUS_CPP_SPEC): Define.

13
gcc/expr.c
View file

@ -8621,6 +8621,19 @@ expand_expr_real_2 (sepops ops, rtx target, machine_mode tmode,
}
def0 = get_def_for_expr (treeop0, NEGATE_EXPR);
/* The multiplication is commutative - look at its 2nd operand
if the first isn't fed by a negate. */
if (!def0)
{
def0 = get_def_for_expr (treeop1, NEGATE_EXPR);
/* Swap operands if the 2nd operand is fed by a negate. */
if (def0)
{
tree tem = treeop0;
treeop0 = treeop1;
treeop1 = tem;
}
}
def2 = get_def_for_expr (treeop2, NEGATE_EXPR);
op0 = op2 = NULL;