How C structures get passed to function in assembly?

Question

1)How C structures get passed to function in assembly. I mean pass by value, not pass by reference. 2)By the way, how callees return structure to its callers? I\'m so sorry for

Answer 1

There's no general answer to your question - every compiler works differently and can do things differently according to what optimisations you select. What you've observed is a common optimisation - the first few parameters of suitable types are passed in registers, with extra and/or complex ones passed on the stack.