On Fri, Jan 16, 2015 at 11:54:34AM -0800, Reid Kleckner wrote:
> > For optimality I meant things like:
> >
> > unsigned char inb (unsigned short int __port)
> > {
> > unsigned char _v;
> >
> > if (__builtin_constant_p(__port) && __port < 256)
> > __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"N" (__port));
> > else
> > __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"d" (__port));
> > return _v;
> > }
> >
>
> This code is still invalid and the backend will still reject this code at
> -O0. Diagnosing it earlier is better.
It works fine here, both with ToT with the patch applied and 3.5.0
(r209294)?
Joerg
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