From 7f7e9dae36c8dd57ab89dae47a87903bbfefb530 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Wed, 12 Apr 2017 09:41:02 +0000 Subject: re PR tree-optimization/79390 (10% performance drop in SciMark2 LU after r242550) 2017-04-12 Richard Biener PR tree-optimization/79390 * gimple-ssa-split-paths.c (is_feasible_trace): Restrict threading case even more. From-SVN: r246869 --- gcc/gimple-ssa-split-paths.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'gcc/gimple-ssa-split-paths.c') diff --git a/gcc/gimple-ssa-split-paths.c b/gcc/gimple-ssa-split-paths.c index df88c76aa53..70651c5dea3 100644 --- a/gcc/gimple-ssa-split-paths.c +++ b/gcc/gimple-ssa-split-paths.c @@ -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 (use_stmt)) + if (gimple_cond_code (cond) == EQ_EXPR + || gimple_cond_code (cond) == NE_EXPR) + found_useful_phi = true; break; } } -- cgit v1.2.3