[PATCH] D95428: [ARM] Add MVE insert-of-extract pattern

[Dave Green via Phabricator via llvm-commits]

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

A v4i32 insert of an extract can become a simple lane move, as opposed to round-tripping via a GPR. This adds a patterns that turns an v4i32 insert-extract pair into a EXTRACT_SUBREG/INSERT_SUBREG, with the required COPY_TO_REGCLASS. These get better optimized into a simple lane move by the rest of the backed.


https://reviews.llvm.org/D95428

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

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