[PATCH] D151934: InstCombine: Recognize fneg when performed as bitcasted integer

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: foad, jcranmer-intel, spatel, aarzee, scanon, majnemer, mehdi_amini, nikic, andrew.w.kaylor, sepavloff, resistor, efriedma.
Herald added subscribers: StephenFan, hiraditya.
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arsenm requested review of this revision.
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This is a resurrection of D18874 <https://reviews.llvm.org/D18874>. This was previously wrong with
fneg conflated with fsub, but we now have a proper fneg instruction.
Additionally, I think it is now clearer that IR float=IEEE float,
and a different bit layout would require adding a different IR type.


https://reviews.llvm.org/D151934

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/fneg-as-int.ll

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