[PATCH] D105814: [ARM] Expand types handled in VQDMULH recognition

[Dave Green via Phabricator via llvm-commits]

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

We have a DAG combine for recognizing the sequence of nodes that make up an MVE VQDMULH, but only currently handles specifically legal types. This patch expands that to other power-2 vector types. For smaller than legal types this means any_extending the type and casting it to a legal type, using a VQDMULH where we only use some of the lanes. The result is sign extended back to the original type, to properly set the invalid lanes.  Larger than legal types are split into chunks with extracts and concat back together.


https://reviews.llvm.org/D105814

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/Thumb2/mve-vqdmulh.ll

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