[PATCH] D68283: [ARM] Selection for MVE VMOVN

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: t.p.northover, samparker, SjoerdMeijer, ostannard, simon_tatham.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: LLVM.

The adds both VMOVNt and VMOVNb instruction selection from the appropriate shuffles. We detect shuffle masks of the form:
0, N, 2, N+2, 4, N+4, ...
or
0, N+1, 2, N+3, 4, N+5, ...
ISel will also try the opposite patterns, with inputs reversed. These are selected to VMOVNt and VMOVNb respectively.


https://reviews.llvm.org/D68283

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/ARM/ARMISelLowering.h
  llvm/lib/Target/ARM/ARMInstrMVE.td
  llvm/test/CodeGen/Thumb2/mve-vmovn.ll

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