inline ASM function calling conventions.

[Sjoerd Nijboer]

On Sunday, 30 September 2018 at 12:07:53 UTC, Basile B. wrote:
> On Sunday, 30 September 2018 at 11:53:17 UTC, Basile B. wrote:
>>
>> Hello, i think this should be here 
>> (https://dlang.org/spec/abi.html) because myself i never 
>> remember them correctly without playing a bit with a 
>> disassembler.
>> After playing a bit:

Thank you for the link, very informative!
I'm spitting it through right now.

>
> Without all the save/restore BS:
>
> module runnable;
>
> import std.stdio;
>
> alias write4Int = writeln!(int,int,int,int);
>
> struct MyStruct{int i;}
>
> extern(D) void foo(ref MyStruct s1, ref MyStruct s2, ref 
> MyStruct s3, ref MyStruct s4)
> {
>     asm
>     {
>         naked;
>         mov     RCX, MyStruct.i.offsetof[RCX];
>         mov     RDX, MyStruct.i.offsetof[RDX];
>         mov     RSI, MyStruct.i.offsetof[RSI];
>         mov     RDI, MyStruct.i.offsetof[RDI];
>         call    write4Int;
>         ret;
>     }
> }
>
> void main()
> {
>     MyStruct s1 = MyStruct(1);
>     MyStruct s2 = MyStruct(2);
>     MyStruct s3 = MyStruct(3);
>     MyStruct s4 = MyStruct(4);
>     foo(s1, s2, s3, s4);
> }

In X86_64 it works beautiful!
But in X86 it will pass them via the stack, and I'm trying to get 
rid of that.