[PATCH] D140128: DAG: Look through fneg when trying to create unsafe minnum/maxnum

[Matt Arsenault via Phabricator via llvm-commits]

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This makes most sense for isFNegFree targets, but shouldn't make
things worse without it. This avoids AMDGPU test regressions in a
future patch.

      

For some reason APFloat::compareAbsoluteValue is private, so compute
the neg of the constants.


https://reviews.llvm.org/D140128

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/ARM/unsafe-fneg-select-minnum-maxnum-combine.ll

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