[PATCH] D94958: [ARM] Add MVE add.sat costs

[Dave Green via Phabricator via llvm-commits]

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

This adds some basic MVE sadd_sat/ssub_sat/uadd_sat/usub_sat costs, based on when the instruction is legal. With smaller than legal types that are promoted we generate shr(qadd(shl, shl)), so the cost is 4 appropriately.


https://reviews.llvm.org/D94958

Files:
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/ARM/arith-ssat.ll
  llvm/test/Analysis/CostModel/ARM/arith-usat.ll

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