[PATCH] D24534: AMDGPU: Allow some control flow intrinsics to be CSEd

[Matt Arsenault via llvm-commits]

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

These clean up some unnecessary or instructions in
cases with complex loops.
  
In the original testcase I noticed this, the same
or with exec was repeated 5 or 6 times in a row. With
this only one is emitted or sometimes a copy.


https://reviews.llvm.org/D24534

Files:
  lib/Target/AMDGPU/SIAnnotateControlFlow.cpp
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/SIInstrFormats.td
  lib/Target/AMDGPU/SIInstructions.td
  lib/Target/AMDGPU/SIIntrinsics.td
  test/CodeGen/AMDGPU/multilevel-break.ll

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