[all-commits] [llvm/llvm-project] 49fcfa: [GVN] Turn off ScalarPRE for TokenLike Types (#156...

[Farzon Lotfi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 49fcfaa15aeeed147280e6e39d802ac712ed3d74
      https://github.com/llvm/llvm-project/commit/49fcfaa15aeeed147280e6e39d802ac712ed3d74
  Author: Farzon Lotfi <farzonlotfi at microsoft.com>
  Date:   2025-09-02 (Tue, 02 Sep 2025)

  Changed paths:
    M llvm/lib/Transforms/Scalar/GVN.cpp
    A llvm/test/Transforms/GVN/PRE/no-phi-translate.ll

  Log Message:
  -----------
  [GVN] Turn off ScalarPRE for TokenLike Types (#156513)

fixes #154407

In HLSL the GVNPass was adding a phi node on
a target extention type.
https://hlsl.godbolt.org/z/sc14YenEe

This is something we cleaned up in a past PR
(https://github.com/llvm/llvm-project/pull/154620) by introducing
`isTokenLikeTy`. In the case of the GVN pass the target extention type
was still making its way through. This change makes it so if we see this
type we don't do PRE.



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