[all-commits] [llvm/llvm-project] ed51e2: [X86] combineAddOrSubToADCOrSBB - commute + neg su...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ed51e26ab4f077c4ca5cb14fe94b257855b0293f
      https://github.com/llvm/llvm-project/commit/ed51e26ab4f077c4ca5cb14fe94b257855b0293f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-03-21 (Mon, 21 Mar 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/add-sub-bool.ll

  Log Message:
  -----------
  [X86] combineAddOrSubToADCOrSBB - commute + neg subtraction patterns

Handle SUB(AND(SRL(Y,Z),1),X) -> NEG(SBB(X,0,BT(Y,Z))) folds

I'll address the X86 lost folded-load regressions in a follow-up patch