[PATCH] D16834: AMDGPU: Make max workgroup size settable by subtarget features

[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.

This generates 32 subtarget features for each possible multiple
of the wave size. The attribute is named +max-work-group-size=N.
The use of an equal sign might be weird because no other target
seems to do this, but it is prettier.

http://reviews.llvm.org/D16834

Files:
  lib/Target/AMDGPU/AMDGPU.td
  lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
  lib/Target/AMDGPU/AMDGPUSubtarget.cpp
  lib/Target/AMDGPU/AMDGPUSubtarget.h
  test/CodeGen/AMDGPU/max-workgroup-size-attr.ll

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