So i have a piece of assembly that needs to call a function with the fastcall calling convention on windows, but gcc doesn't (afaict) support it. GCC does provide the regparm attribute but that expects the first 3 parameters to be passed in eax, edx and ecx, whereas fastcall expects the first two parameters to be passed in ecx and edx.

I'm merely trying to avoid effectively duplicating a few code paths, so this isn't exactly critical, but it would be great if it were avoidable.