[PATCH] D94260: [ARM] Update trunc costs

[Dave Green via Phabricator via llvm-commits]

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

We did not have specific costs for larger than legal truncates that were not otherwise cheap (where they were next to stores, for example). As MVE does not have a dedicated instruction for them (and we do not use loads/stores yet), they should be expensive as they get expanded to a series of lane moves.


https://reviews.llvm.org/D94260

Files:
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/ARM/arith-overflow.ll
  llvm/test/Analysis/CostModel/ARM/cast.ll
  llvm/test/Analysis/CostModel/ARM/mve-gather-scatter-cost.ll

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