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gimple-ssa-backprop.c (optimize_phi): Do not replace an argument corresponding to an abnormal edge.

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* gimple-ssa-backprop.c (optimize_phi): Do not replace an argument
	corresponding to an abnormal edge.

From-SVN: r233248
This commit is contained in:
Eric Botcazou 2016-02-09 17:21:57 +00:00 • committed by Eric Botcazou
parent f10208b8e9
commit a864ad5ba2
2 changed files with 13 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-02-09 Eric Botcazou <ebotcazou@adacore.com>
* gimple-ssa-backprop.c (optimize_phi): Do not replace an argument
corresponding to an abnormal edge.
2016-02-09 Tom de Vries <tom@codesourcery.com>
PR tree-optimization/69599

10
gcc/gimple-ssa-backprop.c
View file

@ -831,15 +831,21 @@ backprop::optimize_assign (gassign *assign, tree lhs, const usage_info *info)
void
backprop::optimize_phi (gphi *phi, tree var, const usage_info *info)
{
/* If the sign of the result doesn't matter, strip sign operations
from all arguments. */
/* If the sign of the result doesn't matter, try to strip sign operations
from arguments. */
if (info->flags.ignore_sign)
{
basic_block bb = gimple_bb (phi);
use_operand_p use;
ssa_op_iter oi;
bool replaced = false;
FOR_EACH_PHI_ARG (use, phi, oi, SSA_OP_USE)
{
/* Propagating along abnormal edges is delicate, punt for now. */
const int index = PHI_ARG_INDEX_FROM_USE (use);
if (EDGE_PRED (bb, index)->flags & EDGE_ABNORMAL)
continue;
tree new_arg = strip_sign_op (USE_FROM_PTR (use));
if (new_arg)
{