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* Handle functions with struct arguments or return types and the regparmRafael Espindola2012-07-311-0/+177
attribute. It is a variation of the x86_64 ABI: * A struct returned indirectly uses the first register argument to pass the pointer. * Floats, Doubles and structs containing only one of them are not passed in registers. * Other structs are split into registers if they fit on the remaining ones. Otherwise they are passed in memory. * When a struct doesn't fit it still consumes the registers. llvm-svn: 161022
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