[PATCH] D103704: [ARM] Extend narrow values to allow using truncating scatters

[Dave Green via Phabricator via llvm-commits]

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

As a minor adjustment to the existing lowering of offset scatters, this extends any smaller-than-legal vectors into full vectors using a zext, so that the truncating scatters can be used. Due to the way MVE legalizes the vectors this should be cheap in most situations, and will prevent the vector from being scalarized.


https://reviews.llvm.org/D103704

Files:
  llvm/lib/Target/ARM/MVEGatherScatterLowering.cpp
  llvm/test/CodeGen/Thumb2/mve-scatter-ind32-unscaled.ll
  llvm/test/CodeGen/Thumb2/mve-scatter-ind8-unscaled.ll
  llvm/test/CodeGen/Thumb2/mve-scatter-ptrs.ll

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