Using YMM registers causes an undefined label error

[kinke]

On Saturday, 6 March 2021 at 12:15:43 UTC, Mike Parker wrote:
> On Saturday, 6 March 2021 at 11:57:13 UTC, Imperatorn wrote:
>
>> What... Is this really how it's supposed to be? Makes no sense 
>> to not use any of the existing conventions.
>
> extern(C) and extern(D) are both documented to be the same as 
> the platform's C calling convention everywhere except x86 
> windows:
>
> https://dlang.org/spec/abi.html#function_calling_conventions
>
> There have been times when differences were noted (I recall a 
> particularly bad one related to passing structs by value on 
> 64-bit linux) and there may be more. When they are, they should 
> be reported in Bugzilla.

The main difference is that the params are reversed for 
extern(D), at least with DMD and LDC, not with GDC. And that 
can't be easily changed because of all the naked DMD-style inline 
asm code (GDC doesn't support that, so no problem for GDC). This 
comes up regularly here in this forum whenever people experiment 
with DMD-style asm.

There are other slight breakages of that 'spec', e.g., LDC's 
extern(D) ABI is very similar to Microsoft's __vectorcall (so 
that e.g. vectors are passed in registers).