[all-commits] [llvm/llvm-project] 70f22b: CodeGen: Fix SplitCriticalEdge using wrong VNInfo ...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 70f22b8e024924ff69674da78a61da4c200b0e3c
      https://github.com/llvm/llvm-project/commit/70f22b8e024924ff69674da78a61da4c200b0e3c
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M llvm/lib/CodeGen/MachineBasicBlock.cpp
    A llvm/test/CodeGen/AMDGPU/phi-elimination-split-critical-edge-subranges.mir

  Log Message:
  -----------
  CodeGen: Fix SplitCriticalEdge using wrong VNInfo for subranges (#226214)

This fixes verifier errors when LiveIntervals is run before phi
elimination.

When extending a live interval across a newly split critical edge for a
PHI source operand, the subrange segments were added using the VNInfo of
the main range instead of the subrange's own value. Look up the
subrange's value at the predecessor's last index, as the other subrange
loop in the same function already does, and skip subranges with no value
there.

Co-authored-by: Claude Opus 5 <noreply at anthropic.com>



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