__builtin_constant_p and inline assembly constraints

[Simon Kagstrom]

At Wed, 23 Aug 2006 13:43:06 +0100,
Andrew Haley wrote:
> 
> Simon Kagstrom writes:
>  > and it didn't work because of the
>  > 
>  > 	:"r?i" (__builtin_constant_p(a) ? 0xfffd : 0xfffe), "r?i" (a), \
>  > 
>  > part.
> 
> But that __builtin_constant_p problem was because you put the call to
> it in a function, not because of any other issues.  Why not put the
> *whole lot* in a macro?  There's no need to break it into separate
> functions.  Why was the function you had before not something like
> 
> #define puts(string)
>  ({									\
>   register unsigned long __v0 asm ("$2");				\
> [...]
> 
> Surely that would work.

Yes, it works, I've implemented it this way now. I would have
preferred functions because of type checking etc (and because it makes
the syscall definitions more readable, I think), but it seems this is
the only way to do it properly.

Thanks for helping me out with this! I've learned a lot in the process
:-)

// Simon