[PATCH] D117097: [AArch64] Basic demand elements for some intrinsics

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: jaykang10, samtebbs, sdesmalen, david-arm, MattDevereau.
Herald added subscribers: hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

A lot of neon intrinsics work lane-wise, meaning that non-demanded elements in and not demanded out. This teaches that to AArch64TTIImpl::simplifyDemandedVectorEltsIntrinsic for some simple single-element truncate intrinsics, which can help remove unnecessary instructions in the final result.


https://reviews.llvm.org/D117097

Files:
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
  llvm/test/Transforms/InstCombine/AArch64/demandelts.ll

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