Comment by anonymousiam

"In x86 calling convention, structs are copied to the stack and their pointers are passed to functions. But in x86-64, you have to destructure a struct into multiple pieces of data and pass them via registers. It's complicated, so I'll leave it alone for now. It's rare that you want to pass a struct as a value instead of passing a pointer to a struct."

Would anyone care to explain this? It makes no sense at all to me. Why would the 64-bit architecture restrict passing a large object on the stack?

Thanks.