[all-commits] [llvm/llvm-project] 109394: [SLP] Add comment clarifying assumption that tripp...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1093949cff73d1c762ee88e0f1016b1aecee995e
      https://github.com/llvm/llvm-project/commit/1093949cff73d1c762ee88e0f1016b1aecee995e
  Author: Philip Reames <listmail at philipreames.com>
  Date:   2022-03-18 (Fri, 18 Mar 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

  Log Message:
  -----------
  [SLP] Add comment clarifying assumption that tripped me up [NFC]

I keep thinking this assumption is probably exploitable for a bug in the existing implementation, but all of my attempts at writing a test case have failed.  So for the moment, just document this very subtle assumption.