[llvm] [GlobalIsel] Combine cast of const integer. (PR #96139)

[Dhruv Chawla via llvm-commits]

Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/96139 at github.com>


dc03-work wrote:

These combines already exists in the Artifact Combiner:
- `G_ANYEXT`: https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h#L97-L114
- `G_ZEXT`: https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h#L97-L114
- `G_SEXT`: https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h#L241-L253
- `G_TRUNC`: https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h#L270-L281 

Can we remove these folds if this gets implemented? Also, please add the fold for `G_ANYEXT` as well.

https://github.com/llvm/llvm-project/pull/96139