[all-commits] [llvm/llvm-project] c363a3: [LV] Ensure getScaledReductions only matches exten...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c363a3f9c858b38afa34f3a8ebcc3fa7a4062315
      https://github.com/llvm/llvm-project/commit/c363a3f9c858b38afa34f3a8ebcc3fa7a4062315
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-07-15 (Tue, 15 Jul 2025)

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

  Log Message:
  -----------
  [LV] Ensure getScaledReductions only matches extends inside the loop (#148264)

In getScaledReductions for the case where we try to match a partial
reduction of the form:

%phi = phi i32 ...
...
%add = add i32 %phi, %zext

where

%zext = i8 %some_val to i32

we should ensure that %zext is actually inside the loop.

Fixes https://github.com/llvm/llvm-project/issues/148260



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