[all-commits] [llvm/llvm-project] 237fbf: [CodeGen] Join live range segments after dead def ...

[Yaxun (Sam) Liu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 237fbfd7cfbd2a2a4f0b171e493aa85b8506065a
      https://github.com/llvm/llvm-project/commit/237fbfd7cfbd2a2a4f0b171e493aa85b8506065a
  Author: Yaxun (Sam) Liu <yaxun.liu at amd.com>
  Date:   2026-06-22 (Mon, 22 Jun 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/LiveInterval.h
    M llvm/lib/CodeGen/LiveInterval.cpp
    M llvm/lib/CodeGen/LiveIntervals.cpp
    A llvm/test/CodeGen/AMDGPU/sched-handleMoveUp-dead-def-join.mir

  Log Message:
  -----------
  [CodeGen] Join live range segments after dead def move (#204648)

Moving a dead def upward can retag a following live-range segment to the
same value as the previous segment. That leaves adjacent same-value
segments, which live range verification rejects.

Add a shared LiveRange helper for merging adjacent same-value segments.
Use it in the existing value-number merge code and after retagging later
segments for a moved dead def. Add an AMDGPU scheduler regression test.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications