[all-commits] [llvm/llvm-project] b0473c: [InstCombine] Pull extract through broadcast (#143...

[agorenstein-nvidia via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0473c599b0418c71d15150e0ea19d57df3b98e5
      https://github.com/llvm/llvm-project/commit/b0473c599b0418c71d15150e0ea19d57df3b98e5
  Author: agorenstein-nvidia <agorenstein at nvidia.com>
  Date:   2025-07-04 (Fri, 04 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    A llvm/test/Transforms/InstCombine/vec_extract_through_broadcast.ll
    M llvm/test/Transforms/InstCombine/vec_shuffle-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll
    M llvm/test/Transforms/InstCombine/vscale_extractelement-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/vscale_extractelement.ll

  Log Message:
  -----------
  [InstCombine] Pull extract through broadcast (#143380)

The change adds a new instcombine pattern, and associated test, for
patterns like this:

```
  %3 = shufflevector <2 x float> %1, <2 x float> poison, <4 x i32> zeroinitializer
  %4 = extractelement <4 x float> %3, i64 %idx
```

The shufflevector has a splat, or broadcast, mask, so the extractelement
simply must be the first element of %1, so we transform this to

```
  %2 = extractelement <2 x float> %1, i64 0
```



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