[all-commits] [llvm/llvm-project] 9b4b9d: [MRI] Avoid walking past all defs in hasOneUse() (...

[Mingjie Xu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9b4b9de0319b63ff56dd157b1d12465f206681f6
      https://github.com/llvm/llvm-project/commit/9b4b9de0319b63ff56dd157b1d12465f206681f6
  Author: Mingjie Xu <xumingjie.enna1 at bytedance.com>
  Date:   2026-06-08 (Mon, 08 Jun 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineRegisterInfo.h

  Log Message:
  -----------
  [MRI] Avoid walking past all defs in hasOneUse() (#201249)

The use-def list is circular in the Prev direction (Head->Prev == Tail)
and defs always precede uses, see
MachineRegisterInfo::addRegOperandToUseList().

We can implement hasOneUse() by checking only the Tail and its Prev,
instead of
walking past all defs from the head via use_iterator.



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