Issues using the in-line assembler

[Basile B.]

On Wednesday, 4 April 2018 at 21:00:44 UTC, solidstate1991 wrote:
> I have this code:
> asm @nogc{
> 	movq		XMM0, xy;
> 	paddd		XMM0, sXY;	// xy + sXY
> 	movq		XMM3, xy0;
> 	psubd		XMM0, XMM3;	// xy + sXY - x0y0
> 	movq		XMM1, ac;
> 	movq		XMM2, bd;
> 	pmuludq		XMM1, XMM0;	// (ac * (xy + sXY - x0y0))
> 	psrlq		XMM1, 16;	// (ac * (xy + sXY - x0y0))>>16
> 	pmuludq		XMM2, XMM0; // (bd * (xy + sXY - x0y0))
> 	psrlq		XMM2, 16;	// (bd * (xy + sXY - x0y0))>>16
> 	paddq		XMM1, XMM2; // (bd * (xy + sXY - x0y0))>>16 * (ac * (xy 
> + sXY - x0y0))>>16
> 	punpckldq	XMM3, XMM7;
> 	paddq		XMM1, XMM3;	// (bd * (xy + sXY - x0y0))>>16 * (ac * (xy 
> + sXY - x0y0))>>16 + x0y0
> 	movups		XMM2, XMM1;	// Convert 64 bit vectors into 32 bit ones
> 	psrldq		XMM2, 4;
> 	por			XMM2, XMM1;	
> 	movq		result, XMM2;
> }
> I'm getting "bad type/size of operand 'movq'" error on xy0, ac, 
> and bd when I try to compile it. All of the values are the type 
> of int[2], xy is function parameter, sXY is created locally. 
> How can I fix it?

The "this" seems to be in R11, so you have to apply the asm 
syntax for accessing the members using 
<Type>.offsetof.<member>[R11], example:

```
class Foo
{
     double a = 123456;
     extern(D) double foo()
     {
         asm
         {
             naked;
             movq    XMM0, Foo.a.offsetof[R11];
             ret;
         }
     }
}

void main()
{
     import std.stdio;
     (new Foo).foo(0,0).writeln;
}
```

However i cant find any specification saying that R11 is "this".
With a free function just pass the instance as param and replace 
R11 by the register where the instance is passed.