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re PR tree-optimization/79390 (10% performance drop in SciMark2 LU after r242550) 

2017-04-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79390
	* gimple-ssa-split-paths.c (is_feasible_trace): Restrict
	threading case even more.

From-SVN: r246869
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Richard Biener 2017-04-12 09:41:02 +00:00 committed by Richard Biener
parent de81c2f2f9
commit 7f7e9dae36
2 changed files with 13 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-04-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/79390
* gimple-ssa-split-paths.c (is_feasible_trace): Restrict
threading case even more.
2017-04-12 Segher Boessenkool <segher@kernel.crashing.org>
PR target/80382

10
gcc/gimple-ssa-split-paths.c
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@ -249,13 +249,17 @@ is_feasible_trace (basic_block bb)
imm_use_iterator iter2;
FOR_EACH_IMM_USE_FAST (use2_p, iter2, gimple_phi_result (stmt))
{
if (is_gimple_debug (USE_STMT (use2_p)))
gimple *use_stmt = USE_STMT (use2_p);
if (is_gimple_debug (use_stmt))
continue;
basic_block use_bb = gimple_bb (USE_STMT (use2_p));
basic_block use_bb = gimple_bb (use_stmt);
if (use_bb != bb
&& dominated_by_p (CDI_DOMINATORS, bb, use_bb))
{
found_useful_phi = true;
if (gcond *cond = dyn_cast <gcond *> (use_stmt))
if (gimple_cond_code (cond) == EQ_EXPR
|| gimple_cond_code (cond) == NE_EXPR)
found_useful_phi = true;
break;
}
}