[PATCH] D36007: [AMDGPU] Turn s_and_saveexec_b64 into s_and_b64 if result is unused

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec created this revision.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

With SI_END_CF elimination for some nested control flow we can now
eliminate saved exec register completely by turning a saveexec version
of instruction into just a logical instruction.


https://reviews.llvm.org/D36007

Files:
  lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
  lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
  test/CodeGen/AMDGPU/collapse-endcf.ll

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