[llvm-dev] Passing arguments and returning value of struct or class

[Chanhyun Park via llvm-dev]

Hi all.

I'm new to LLVM and I'm having fun with LLVM.
Recently, I fount that function calls are changed based on the types of
return value and arguments.

For example, as following codes, the generated LLVM IRs are efferent from
what I expected them would be.
-------------------
// simple C code
struct Float2
{
    float x; float y;
}
Float2 foo(Float2 a)
-------------------
// simple LLVM IR
i64 foo(i64 a)
------------------------

Even, if the size of structure is bigger than 64bit, the LLVM IRs are as
follow.
------------------------
void  foo( struct. Float2* ,  struct.Float2 * )
------------------------

So. I wonder where can I find these rules? I googled but I could not found
official documents or something likes that.

Please help me.

Thanks.
Chanhyun.
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