[all-commits] [llvm/llvm-project] 76c515: [DAG] combineShiftToAVG - don't create avgfloor w...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 76c5158aed52bbf21980752e38262e925cd8db8e
      https://github.com/llvm/llvm-project/commit/76c5158aed52bbf21980752e38262e925cd8db8e
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-06-13 (Thu, 13 Jun 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/RISCV/pr95284.ll
    M llvm/test/CodeGen/X86/avg.ll

  Log Message:
  -----------
  [DAG] combineShiftToAVG  - don't create avgfloor with scalar constant operands unless legal.

Converting to avgfloor and then expanding it back to shift+add later is likely to prevent other folds (re-association and value-tracking in particular) in the meantime.

Fixes #95284



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