[all-commits] [llvm/llvm-project] 3bf597: [LV] Optimize partial reduction extends before han...

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/users/MacDue/fix_inloop_sub_pr
  Home:   https://github.com/llvm/llvm-project
  Commit: 3bf59729c8482020323da4a4c3972b70b62ff503
      https://github.com/llvm/llvm-project/commit/3bf59729c8482020323da4a4c3972b70b62ff503
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2026-05-26 (Tue, 26 May 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-chained.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-usabs.ll

  Log Message:
  -----------
  [LV] Optimize partial reduction extends before handling inloop subs

The crash avoided in #194660 was caused by the extend optimizations
failing to match as due to the extra sub/negation added to the
"ExtendedOp".

A similar crash exists for [us]abs partial reductions
(see https://godbolt.org/z/MerMon5rE), which is fixed with this patch.

This patch solves the underlying issue by running the extend optimizations
before any inloop sub/fsub handling.

Fixes #194000



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