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AArch64: support bfloat extend and trunc
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Authored by t.p.northover on Mar 24 2021, 6:32 AM.
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A useful step on the way to supporting full bfloat arithmetic is allowing code that immediately extends a bfloat before doing anything non-trivial, and truncate it back before storage.

This patch implements that by making sure we don't try any extload/truncstores and adding patterns for the relevant conversions.

I also had to ban GlobalISel from dealing with bfloat here because its type system only has s16 and it thinks they're normal half conversions.

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t.p.northover created this revision.Mar 24 2021, 6:32 AM
t.p.northover requested review of this revision.Mar 24 2021, 6:32 AM
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