[all-commits] [llvm/llvm-project] 38f3d0: [MCP] Never eliminate frame-setup/destroy instruct...

[Scott Linder via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 38f3d0be121c04b42f0988a25c22ea67543919f8
      https://github.com/llvm/llvm-project/commit/38f3d0be121c04b42f0988a25c22ea67543919f8
  Author: Scott Linder <scott.linder at amd.com>
  Date:   2026-04-16 (Thu, 16 Apr 2026)

  Changed paths:
    M llvm/lib/CodeGen/MachineCopyPropagation.cpp
    M llvm/test/CodeGen/X86/machine-copy-prop.mir

  Log Message:
  -----------
  [MCP] Never eliminate frame-setup/destroy instructions (#186237)

Presumably targets only insert frame instructions which are significant,
and there may be effects MCP doesn't model. Similar to reserved
registers this
is probably overly conservative, but as this causes no codegen change in
any lit test I think it is benign.

The motivation is just to clean up #183149 for AMDGPU, as we can spill
to physical registers, and currently have to spill the EXEC mask purely
to enable debug-info.

Change-Id: I9ea4a09b34464c43322edd2900361bf635efd9f7



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