[PATCH] D143963: AMDGPU: Override getNegatedExpression constant handling

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: AMDGPU, rampitec, foad, sebastian-ne, Pierre-vh.
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Ignore the multiple use heuristics of the default
implementation, and report cost based on inline immediates. This
is mostly interesting for -0 vs. 0. Gets a few small improvements.
fneg_fadd_0_f16 is a small regression. We could probably avoid this
if we handled folding fneg into div_fixup.


https://reviews.llvm.org/D143963

Files:
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/fdiv32-to-rcp-folding.ll
  llvm/test/CodeGen/AMDGPU/fneg-combines.f16.ll
  llvm/test/CodeGen/AMDGPU/fneg-combines.new.ll
  llvm/test/CodeGen/AMDGPU/v_pack.ll

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