On Tue, Aug 27, 2019 at 10:48:24PM +1000, Nicholas Piggin wrote:
> Christophe Leroy's on August 27, 2019 6:13 pm:
> > +#define wrtee(val) asm volatile("wrtee %0" : : "r" (val) : "memory")
> > +#define wrteei(val) asm volatile("wrteei %0" : : "i" (val) :
> > "memory")
>
> Can you implement just one macro that uses __builtin_constant_p to
> select between the imm and reg versions? I forgot if there's some
> corner cases that prevent that working with inline asm i constraints.
static inline void wrtee(long val)
{
asm volatile("wrtee%I0 %0" : : "n"(val) : "memory");
}
(This output modifier goes back to the dark ages, some 2.4 or something).
Segher
