[all-commits] [llvm/llvm-project] 468fb5: RegisterCoalescer: Set undef on full register uses...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 468fb5fc7ebc42820cf8a2114d20f321a9ede0ee
      https://github.com/llvm/llvm-project/commit/468fb5fc7ebc42820cf8a2114d20f321a9ede0ee
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-12-02 (Mon, 02 Dec 2024)

  Changed paths:
    M llvm/lib/CodeGen/RegisterCoalescer.cpp
    A llvm/test/CodeGen/AMDGPU/register-coalescer--set-undef-full-reg-use-implicit-def-erase-issue109249.mir

  Log Message:
  -----------
  RegisterCoalescer: Set undef on full register uses when coalescing implicit_def (#118321)

Previously this would delete the IMPLICIT_DEF and not introduce the undef
flag on the use operand.

Fixes sub-issue found while reducing #109294



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