[all-commits] [llvm/llvm-project] 0bd925: [X86] Improve KnownBits for X86ISD::PSADBW nodes (...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0bd9255f8ad9f321dd606365e2bc28447a9976cb
      https://github.com/llvm/llvm-project/commit/0bd9255f8ad9f321dd606365e2bc28447a9976cb
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-03-06 (Wed, 06 Mar 2024)

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

  Log Message:
  -----------
  [X86] Improve KnownBits for X86ISD::PSADBW nodes (#83830)

Don't just return the known zero upperbits, compute the absdiff Knownbits and perform the horizontal sum.

Add implementations that handle both the X86ISD::PSADBW nodes and the INTRINSIC_WO_CHAIN intrinsics (pre-legalization).



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