[PATCH] D16252: AMDGPU: Reduce 64-bit lshr by constant to 32-bit

[Matt Arsenault via llvm-commits]

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

64-bit shifts are very slow on some subtargets.

http://reviews.llvm.org/D16252

Files:
  lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  lib/Target/AMDGPU/AMDGPUISelLowering.h
  test/CodeGen/AMDGPU/half.ll
  test/CodeGen/AMDGPU/shift-i64-opts.ll

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