Messages in this thread | | | Date | Wed, 7 Jun 2017 14:18:44 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 13/17] RISC-V: Add include subdirectory |
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On Wed, Jun 07, 2017 at 02:06:13PM +0200, Peter Zijlstra wrote: > On Tue, Jun 06, 2017 at 04:00:03PM -0700, Palmer Dabbelt wrote:
> > +static inline int atomic_fetch_sub(unsigned int mask, atomic_t *v) > > +{ > > + int out; > > + > > + __asm__ __volatile__ ( > > + "amosub.w %2, %1, %0" > > + : "+A" (v->counter), "=r" (out) > > + : "r" (mask)); > > + return out; > > +}
Your instruction manual does not list AMOSUB as a valid instruction. So either it is wrong or this code never compiled. Please clarify.
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