sdardis added a comment.

Checking the generated IR for the incorrect uses of v8f16 shows that clang is 
silently generating bitcasts from <8 x i16> to <4 x float>. There are some 
other cases where the type of the operands is incorrect w.r.t. the builtin used.

I'm not familiar with the type checking machinery, so I'm unsure if the silent 
conversion is a bug or feature.

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