[PATCH] D23640: AMDGPU: Split SILowerControlFlow into two pieces

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: kzhuravl, arsenm.

Do most of the lowering in a pre-RA pass. Keep the skip jump
insertion late, plus a few other things that require more
work to move out.
    
One concern I have is now there may be COPY instructions
which do not have the necessary implicit exec uses
 f they will be lowered to v_mov_b32.
    
This has a positive effect on SGPR usage in shader-db: https://ghostbin.com/paste/rvn5x

https://reviews.llvm.org/D23640

Files:
  lib/Target/AMDGPU/AMDGPU.h
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  lib/Target/AMDGPU/CMakeLists.txt
  lib/Target/AMDGPU/SIInsertSkips.cpp
  lib/Target/AMDGPU/SIInstructions.td
  lib/Target/AMDGPU/SILowerControlFlow.cpp
  test/CodeGen/AMDGPU/else.ll
  test/CodeGen/AMDGPU/valu-i1.ll

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