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Do not fold away double negation if the tree is a CSE candidate #50373

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SingleAccretion
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Fixes #50369.

@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 29, 2021
@SingleAccretion SingleAccretion force-pushed the Do-Not-Fold-Away-Double-Negation-If-The-Tree-Is-A-CSE-Candidate branch from 989033d to b413465 Compare March 29, 2021 17:38
@AndyAyersMS
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Thanks for the report and the the fix!

@AndyAyersMS AndyAyersMS merged commit 260397c into dotnet:main Mar 30, 2021
@SingleAccretion SingleAccretion deleted the Do-Not-Fold-Away-Double-Negation-If-The-Tree-Is-A-CSE-Candidate branch April 13, 2021 00:30
@JulieLeeMSFT JulieLeeMSFT added this to the 6.0.0 milestone Apr 15, 2021
@ghost ghost locked as resolved and limited conversation to collaborators May 15, 2021
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CSE fails for a tree of chained NEGs
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