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[InstCombine] Don't transform bitcasts between x86_mmx and v1i64 into insertelement/extractelement

Authored by craig.topper on Thu, Nov 7, 1:18 PM.



x86_mmx is conceptually a vector already. Don't introduce an extra conversion between it and scalar i64.

I'm using VectorType::isValidElementType which checks for floating point, integer, and pointers to hopefully make this more readable than just blacklisting x86_mmx.

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craig.topper created this revision.Thu, Nov 7, 1:18 PM
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This revision is now accepted and ready to land.Thu, Nov 7, 1:52 PM
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