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Compiler implementation of the D programming language.

Source argtypes.d

TypeTuple toArgTypes(Type t);
This breaks a type down into 'simpler' types that can be passed to a function in registers, and returned in registers. It's highly platform dependent.
Type t type to break down
tuple of types, each element can be passed in a register. A tuple of zero length means the type cannot be passed/returned in registers.