33 lines
1.5 KiB
Diff
33 lines
1.5 KiB
Diff
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From d73c61c26fd00e3cb8daa24fa254b756c48309ca Mon Sep 17 00:00:00 2001
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From: wanghuang <wanghuang3@huawei.com>
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Date: Sun, 29 Sep 2019 15:57:24 +0000
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Subject: [PATCH] 8231988: Unexpected test result caused by C2 IdealLoopTree::do_remove_empty_loop
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Summary: Unexpected test result caused by C2 IdealLoopTree::do_remove_empty_loop
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LLT:
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Bug url: https://bugs.openjdk.java.net/browse/JDK-8231988
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---
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hotspot/src/share/vm/opto/loopTransform.cpp | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/hotspot/src/share/vm/opto/loopTransform.cpp b/hotspot/src/share/vm/opto/loopTransform.cpp
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index caf7a9b758..c7bb19763c 100644
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--- a/hotspot/src/share/vm/opto/loopTransform.cpp
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+++ b/hotspot/src/share/vm/opto/loopTransform.cpp
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@@ -2215,6 +2215,12 @@ bool IdealLoopTree::policy_do_remove_empty_loop( PhaseIdealLoop *phase ) {
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// We also need to replace the original limit to collapse loop exit.
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Node* cmp = cl->loopexit()->cmp_node();
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assert(cl->limit() == cmp->in(2), "sanity");
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+ if (cmp->outcnt() > 1) { //we have more than one BoolNode here
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+ cmp = cmp->clone();
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+ cmp = phase->_igvn.register_new_node_with_optimizer(cmp);
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+ BoolNode *bl = cl->loopexit()->in(CountedLoopEndNode::TestValue)->as_Bool();
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+ phase->_igvn.replace_input_of(bl, 1, cmp); // put BoolNode on worklist
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+ }
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phase->_igvn._worklist.push(cmp->in(2)); // put limit on worklist
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phase->_igvn.replace_input_of(cmp, 2, exact_limit); // put cmp on worklist
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}
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--
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2.12.3
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