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

Authored by dmgreen on Jun 25 2019, 3:01 AM.



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.

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Event Timeline

dmgreen created this revision.Jun 25 2019, 3:01 AM
This revision is now accepted and ready to land.Jun 26 2019, 7:21 AM