[all-commits] [llvm/llvm-project] f0bc41: [X86] combineBasicSADPattern - pattern match vario...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f0bc41181c0fd03069ca63a3b8b0f85e3c7cb477
      https://github.com/llvm/llvm-project/commit/f0bc41181c0fd03069ca63a3b8b0f85e3c7cb477
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-07-09 (Wed, 09 Jul 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/sad.ll

  Log Message:
  -----------
  [X86] combineBasicSADPattern - pattern match various vXi8 ABDU patterns (#147570)

We were previously limited to abs(sub(zext(),zext()) patterns, but add
handling for a number of other abdu patterns until a topological sorted
dag allows us to rely on a ABDU node having already been created.

Now that we don't just match zext() sources, I've generalised the
createPSADBW helper to explicitly zext/truncate to the expected vXi8
source type - it still assumes the sources are correct for a PSADBW
node.

Fixes #143456



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