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

[mayuyu.io via llvm-dev]

I remember as pointed out by someone else on the mailing list. (Tim, I believe) This is Clang trying to match the platform’s ABI specification

Zhang

> 在 2018年12月5日，03:59，Chanhyun Park via llvm-dev <llvm-dev at lists.llvm.org> 写道：
> 
> 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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