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JIT: Don't fold NEG(NEG(X)) to X when NEG(x) is a CSE candidate #57478

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merged 4 commits into from
Aug 17, 2021
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JIT: Don't fold NEG(NEG(X)) to X when NEG(x) is a CSE candidate #57478

merged 4 commits into from
Aug 17, 2021

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EgorBo
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@EgorBo EgorBo commented Aug 16, 2021 •
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Fixes #57470

cc @dotnet/jit-contrib

@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 Aug 16, 2021
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ghost commented Aug 16, 2021

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Not sure it fixes #57470 but it looks like a potential issue.

cc @dotnet/jit-contrib

Author: EgorBo
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area-CodeGen-coreclr
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@adamsitnik adamsitnik mentioned this pull request Aug 16, 2021
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EgorBo commented Aug 16, 2021

NOTE: missing "Is CSE candidate" is a quite popular issue in morph 😞

I think we can write a stress-test where we set "IsCseCandidate" bit early in global morph and detect all transformations which ignore it and still modify trees, something like that.

kunalspathak
kunalspathak approved these changes Aug 16, 2021
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LGTM, Thanks

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@EgorBo - did you get chance to check CI failures? If they are existing, we can go ahead and merge this PR.

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EgorBo commented Aug 17, 2021

@EgorBo - did you get chance to check CI failures? If they are existing, we can go ahead and merge this PR.

Yeah, all of them are unrelated and fail on other PRs too (just checked all of them on runfo)

@EgorBo EgorBo merged commit 492a520 into dotnet:main Aug 17, 2021
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@jakobbotsch jakobbotsch jakobbotsch approved these changes

@kunalspathak kunalspathak kunalspathak approved these changes

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Successfully merging this pull request may close these issues.

Unable to find expression in a statement during CSE
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@EgorBo @kunalspathak @jakobbotsch