Messages in this thread | | | Date | Wed, 20 Dec 2006 22:34:23 -0500 | From | Mathieu Desnoyers <> | Subject | Re: [Ltt-dev] [PATCH 7/10] local_t : powerpc |
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* Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) wrote: > --- a/include/asm-powerpc/local.h > +++ b/include/asm-powerpc/local.h > +/** > + * local_add_unless - add unless the number is a given value > + * @l: pointer of type local_t > + * @a: the amount to add to l... > + * @u: ...unless l is equal to u. > + * > + * Atomically adds @a to @l, so long as it was not @u. > + * Returns non-zero if @l was not @u, and zero otherwise. > + */ > +static __inline__ int local_add_unless(local_t *l, long a, long u) > +{ > + long t; > + > + __asm__ __volatile__ ( > +"1: ldarx %0,0,%1 # local_add_unless\n\ > + cmpd 0,%0,%3 \n\ > + beq- 2f \n\ > + add %0,%2,%0 \n" > + PPC405_ERR77(0,%2)
Sorry, the previous line is unnecessary : PPC405 is a 32 bits arch errata and this code is compiled on 64 bits arch only.
> +" stdcx. %0,0,%1 \n\ > + bne- 1b \n" > +" subf %0,%2,%0 \n\ > +2:" > + : "=&r" (t) > + : "r" (&(l->a.counter)), "r" (a), "r" (u) > + : "cc", "memory"); > + > + return t != u; > +} > +
Mathieu
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