[PATCH] D15545: TTI: Use 0 for cost of fabs if free

[Matt Arsenault via llvm-commits]

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

Ideally this would also happen for fneg, but that
isn't a distinct operation in the IR.

http://reviews.llvm.org/D15545

Files:
  include/llvm/CodeGen/BasicTTIImpl.h
  test/Analysis/CostModel/AMDGPU/fabs.ll

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