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[CodeGenPrepare] avoid crashing from replacing a phi twice

Description

[CodeGenPrepare] avoid crashing from replacing a phi twice

Summary:
This is a fix to bug 41052:
https://bugs.llvm.org/show_bug.cgi?id=41052

While trying to optimize a memory instruction in a dead basic block, we end up registering the same phi for replacement twice. This patch avoids registering more than the first replacement candidate for a phi.

Patch by: JesperAntonsson

Reviewers: skatkov, aprantl

Reviewed By: aprantl

Subscribers: jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59358

Details

Committed
uabelhoMar 15 2019, 6:51 AM
Reviewer
aprantl
Differential Revision
D59358: [CodeGenPrepare] avoid crashing from replacing a phi twice
Parents
rL356259: [ARM] Remove EarlyCSE from backend
Branches
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Tags
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