[llvm-branch-commits] [llvm] [LV] Choose best reduction for VPlan (PR #166138)

[Sam Tebbs via llvm-branch-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
+; RUN: opt -S -mcpu=neoverse-v2 -passes=loop-vectorize -mtriple=aarch64 < %s | FileCheck %s
+target triple = "aarch64"
+
+; Check that a partial reduction is reverted back to a regular reduction,
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SamTebbs33 wrote:

Could you add some check statements that make sure that the reversion to a normal reduction happened? I think we'll also want a test with a subtract, as well as chained add and chained subtract.

https://github.com/llvm/llvm-project/pull/166138