[PATCH] D28874: [AMDGPU] Add VGPR copies post regalloc fix pass

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec created this revision.
Herald added a reviewer: tstellarAMD.
Herald added subscribers: tony-tye, yaxunl, mgorny, nhaehnle, wdng, kzhuravl, arsenm.

Regalloc creates COPY instructions which do not formally use VALU.
That results in v_mov instructions displaced after exec mask modification.
One pass which do it is SIOptimizeExecMasking, but potentially it can be
done by other passes too.

This patch adds a pass immediately after regalloc to add implicit exec
use operand to all VGPR copy instructions.


Repository:
  rL LLVM

https://reviews.llvm.org/D28874

Files:
  lib/Target/AMDGPU/AMDGPU.h
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  lib/Target/AMDGPU/CMakeLists.txt
  lib/Target/AMDGPU/SIFixVGPRCopies.cpp
  test/CodeGen/AMDGPU/fix-vgpr-copies.mir

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