[PATCH] D106776: [GlobalISel] Add a constant folding combine.

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

> These don't always get folded because when the instructions are created the constants are obscured by artifacts, or other reasons.

For the AMDGPU fshl/fshr tests, the reason is that the foldable instructions are created during legalization, and the AMDGPU legalizer doesn't use CSEMIRBuilder yet.


Repository:
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https://reviews.llvm.org/D106776