[PATCH] x86-64 ABI: unwrap single element structs / arrays of 256-bit vectors to pass and return in registers

[hfinkel at anl.gov]

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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