[PATCH] D100245: [ARM] Expand VMOVRRD simplification pattern

[Dave Green via Phabricator via llvm-commits]

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

This expands the `VMOVRRD(extract(..(build_vector(a, b, c, d))))` pattern, to also handle insert_vectors. Providing we can find the correct insert, this helps further simplify patterns by removing the redundant VMOVRRD.


https://reviews.llvm.org/D100245

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/ARM/dagcombine-anyexttozeroext.ll
  llvm/test/CodeGen/ARM/vdup.ll
  llvm/test/CodeGen/Thumb2/mve-vecreduce-add.ll
  llvm/test/CodeGen/Thumb2/mve-vecreduce-mla.ll

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