[PATCH] D20340: AMDGPU: Other sizes of popcnt are fast

[Matt Arsenault via llvm-commits]

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

We can chain bcnt instructions together, so any width popcnt is pretty fast.

http://reviews.llvm.org/D20340

Files:
  lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
  test/CodeGen/AMDGPU/ctpop64.ll
  test/Transforms/LoopIdiom/AMDGPU/popcnt.ll

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