[PATCH] D109360: [ARM] Mark <= -1 immediate constant as cheap

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: samtebbs, SjoerdMeijer, simon_tatham, ostannard.
Herald added subscribers: hiraditya, kristof.beyls.
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A `<= -1` constant on a compare can be converted to a `< 0` operation, which is usually cheap. If we mark the constant as cheap, preventing hoisting, we allow that fold to happen even across different blocks.


https://reviews.llvm.org/D109360

Files:
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/test/CodeGen/ARM/consthoist-icmpimm.ll

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