[PATCH] D112204: [AArch64] Fold neg(csel(neg(a), b)) to csel(a, neg(b))

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: jaykang10, SjoerdMeijer, samtebbs, efriedma.
Herald added subscribers: hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

This folds a negation through a csel, which can come up during the lowering of negative abs.


https://reviews.llvm.org/D112204

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/csel-addsubconst.ll
  llvm/test/CodeGen/AArch64/neg-abs.ll

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