Indeed, this looks like an odd mismatch between
X86_64ABIInfo::GetByteVectorType and the recursive logic in
X86_64ABIInfo::classify (which will recurse and handle the array types).
FWIW, I wonder if there are more bugs hiding in here too. When
X86_64ABIInfo::classify recurses on the array types, it looks like it is just
looking at the total size of the array. isSingleElementStruct specifically
handles only arrays of 1 element. What happens when you try to pass a struct of
{ v4f32 x[2]; }?
If that works, then LGTM (otherwise, we obviously need to fix that too).
http://reviews.llvm.org/D7614
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