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[Miscompile] Freeze needed for lshr(mul (X, 2^C + 1), C) -> add (X, lshr (X, C)) #98927

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AreaZR opened this issue Jul 15, 2024 · 1 comment
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[Miscompile] Freeze needed for lshr(mul (X, 2^C + 1), C) -> add (X, lshr (X, C)) #98927

AreaZR opened this issue Jul 15, 2024 · 1 comment
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llvm:instcombine

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@AreaZR
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AreaZR commented Jul 15, 2024 •
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Alive2 missed the partial undef.

Otherwise, this fold is incorrect.

Originally posted by @AtariDreams in #96324
@AreaZR AreaZR changed the title Freeze needed for lshr(mul (X, 2^C + 1), C) -> add (X, lshr (X, C)) [Miscompile] Freeze needed for lshr(mul (X, 2^C + 1), C) -> add (X, lshr (X, C)) Jul 15, 2024
@nikic
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nikic commented Jul 15, 2024

Please do not create dummy issues for already open PRs.

@nikic nikic closed this as completed Jul 15, 2024
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@nikic @EugeneZelenko @AreaZR