[all-commits] [llvm/llvm-project] b05c55: [X86] LowerABD - simplify i32/i64 to use sub+sub+c...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b05c55472bf7cadcd0e4cb1a669b3474695b0524
      https://github.com/llvm/llvm-project/commit/b05c55472bf7cadcd0e4cb1a669b3474695b0524
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/abds-neg.ll
    M llvm/test/CodeGen/X86/abds.ll
    M llvm/test/CodeGen/X86/abdu-neg.ll
    M llvm/test/CodeGen/X86/abdu.ll

  Log Message:
  -----------
  [X86] LowerABD - simplify i32/i64 to use sub+sub+cmov instead of repeating nodes via abs (#102174)

Using X86ISD::SUB nodes directly allows us to drive the X86ISD::CMOV node with exact flags instead of trying to cleanup the generic codegen via ICMP/SUBO nodes.



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