[PATCH] D63758: [ARM] In MVE Prefer to widen v2i32, not promote them to v2i64

[Dave Green via Phabricator via llvm-commits]

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

In MVE we have v4i32, but not v2i64. Set the preferred action of a v2i32 to widen not promote, so that we don't end up with an illegal type that we end up serialising.

Also adds a test for various vector widths that I'm showing the differences of here.


https://reviews.llvm.org/D63758

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

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