[PATCH] D95456: [ARM] i16 insert-of-extract to VINS pattern

[Dave Green via Phabricator via llvm-commits]

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

This adds another tablegen fold that converts an i16 odd-lane-insert of an even-lane-extract into a VINS. We extract the existing f32 value from the destination register and VINS the new value into it. The rest of the backend then is able to optimize the INSERT_SUBREG/COPY_TO_REGCLASS/EXTRACT_SUBREG.


https://reviews.llvm.org/D95456

Files:
  llvm/lib/Target/ARM/ARMInstrMVE.td
  llvm/test/CodeGen/Thumb2/mve-shuffle.ll
  llvm/test/CodeGen/Thumb2/mve-vld3.ll
  llvm/test/CodeGen/Thumb2/mve-vst3.ll

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