[all-commits] [llvm/llvm-project] f5d153: [VectorCombine] Fold binary op of reductions. (#12...

[Mikhail Gudim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f5d153ef26a9a206ab6eb4307de24c16b600c0d9
      https://github.com/llvm/llvm-project/commit/f5d153ef26a9a206ab6eb4307de24c16b600c0d9
  Author: Mikhail Gudim <mgudim at gmail.com>
  Date:   2025-02-22 (Sat, 22 Feb 2025)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/LoopUtils.h
    M llvm/lib/Transforms/Utils/LoopUtils.cpp
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    A llvm/test/Transforms/VectorCombine/ARM/fold-binop-of-reductions.ll
    M llvm/test/Transforms/VectorCombine/fold-binop-of-reductions.ll

  Log Message:
  -----------
  [VectorCombine] Fold binary op of reductions. (#121567)

Replace binary of of two reductions with one reduction of the binary op
applied to vectors. For example:

```
%v0_red = tail call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> %v0)
%v1_red = tail call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> %v1)
%res = add i32 %v0_red, %v1_red
```
gets transformed to:

```
%1 = add <16 x i32> %v0, %v1
%res = call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> %1)
```



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