On Thu, 30 Nov 2006 23:22:00 +0100
Andi Kleen <[email protected]> wrote:
> >
> > static __inline__ int __test_and_set_bit(int nr, volatile void * addr)
> > {
> > int oldbit;
> >
> > __asm__(
> > "btsl %2,%1\n\tsbbl %0,%0"
> > :"=r" (oldbit),"+m" (ADDR)
> > :"dIr" (nr));
> > return oldbit;
> > }
> >
> > explodes with gcc-3.4.4.
>
> Known issue. The new form is correct and needed, but the old gcc doesn't accept
> it. I haven't gotten a form that is both and correct and works on the old compiler
> out of the gcc hackers I asked.
Oh, thanks.
What does "d" do, btw? My gcc info page only covers "x86" and says only "`d' register"
(And, more importantly, where is the best description of gcc asm constraints?)
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