29 lines
1.1 KiB
Diff
29 lines
1.1 KiB
Diff
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From 34712f6bbc3c2c664ee641c78d4a2f8cfe427880 Mon Sep 17 00:00:00 2001
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From: zhouyong <zhouyong44@huawei.com>
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Date: Fri, 28 Feb 2020 15:17:44 +0000
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Subject: [PATCH] prohibition of irreducible loop in mergers
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Summary: C2Compiler: irreducible loop should not enter merge_many_backedges
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LLT: NA
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Bug url: NA
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---
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hotspot/src/share/vm/opto/loopnode.cpp | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hotspot/src/share/vm/opto/loopnode.cpp b/hotspot/src/share/vm/opto/loopnode.cpp
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index e2c0645cf8..bbb2e2bf98 100644
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--- a/hotspot/src/share/vm/opto/loopnode.cpp
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+++ b/hotspot/src/share/vm/opto/loopnode.cpp
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@@ -1542,7 +1542,7 @@ bool IdealLoopTree::beautify_loops( PhaseIdealLoop *phase ) {
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// If I am a shared header (multiple backedges), peel off the many
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// backedges into a private merge point and use the merge point as
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// the one true backedge.
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- if( _head->req() > 3 ) {
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+ if( _head->req() > 3 && !_irreducible) {
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// Merge the many backedges into a single backedge but leave
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// the hottest backedge as separate edge for the following peel.
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merge_many_backedges( phase );
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--
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2.12.3
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