[all-commits] [llvm/llvm-project] 53096b: [X86][APX] Optimize usub.sat(X, 1) to cmp+adc with ...

[AntonyCJ30 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 53096b7a2d268ab92617436915bc6f9f3cf8d82e
      https://github.com/llvm/llvm-project/commit/53096b7a2d268ab92617436915bc6f9f3cf8d82e
  Author: AntonyCJ30 <cj6186609 at gmail.com>
  Date:   2026-07-18 (Sat, 18 Jul 2026)

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

  Log Message:
  -----------
  [X86][APX] Optimize usub.sat(X,1) to cmp+adc with NDD (#208475)

When NDD is available, usub.sat(X, 1) is lowered from xor+sub+cmov (3
insns) to cmp+adc (2 insns).

All X86 tests pass.

Fixes #207888

Co-authored-by: AntonyCJ30 <cj6186609 at gmail@gmail.com>



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