Stanislav Mekhanoshin da0edef1bd [AMDGPU] Turn s_and_saveexec_b64 into s_and_b64 if result is unused ...

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.

Differential Revision: https://reviews.llvm.org/D36007

llvm-svn: 309766

2017-08-01 23:44:35 +00:00

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