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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.
GCC does support
fastcall, via__attribute__((fastcall)). It appears to have been introduced in GCC 3.4.