[PATCH] D49977: AMDGPU: Reduce code size with fcanonicalize (fneg x)

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: rampitec.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

When fcanonicalize is lowered to a mul, we can
use -1.0 for free and avoid the cost of the bigger
encoding for source modifers.


https://reviews.llvm.org/D49977

Files:
  lib/Target/AMDGPU/AMDGPUInstructions.td
  lib/Target/AMDGPU/SIInstructions.td
  test/CodeGen/AMDGPU/fcanonicalize-elimination.ll
  test/CodeGen/AMDGPU/fcanonicalize.f16.ll
  test/CodeGen/AMDGPU/fcanonicalize.ll
  test/CodeGen/AMDGPU/fneg-combines.ll

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