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Subject: Re: [OMPI users] Problems building Open MPI 1.4.1 with Pathscale
From: Ake Sandgren (ake.sandgren_at_[hidden])
Date: 2010-02-10 10:55:34


On Wed, 2010-02-10 at 08:42 -0700, Barrett, Brian W wrote:
> Adding the memory and cc will certainly do no harm, and someone tried to remove them as an optimization. I wouldn't change the input and output lines - the differences are mainly syntactic sugar.

Gcc actually didn't like the example i sent earlier.
Another iteration gave this as a working (gcc/intel/pgi/pathscale works)
code.

static inline int opal_atomic_cmpset_32( volatile int32_t *addr,
                                         int32_t oldval, int32_t newval)
{
    unsigned char ret;
    __asm__ __volatile__ (
                        SMPLOCK "cmpxchgl %3,%2 \n\t"
                                "sete %0 \n\t"
                        : "=qm" (ret), "+a" (oldval), "+m" (*addr)
                        : "q"(newval)
                        : "memory", "cc");

    return (int)ret;
}

-- 
Ake Sandgren, HPC2N, Umea University, S-90187 Umea, Sweden
Internet: ake_at_[hidden]   Phone: +46 90 7866134 Fax: +46 90 7866126
Mobile: +46 70 7716134 WWW: http://www.hpc2n.umu.se