Merge pull request #918 from stanmoore1/kk_atomics

unsigned int atomic_fetch_sub( volatile unsigned int * const dest , const unsigned int val )

{ return atomicSub((unsigned int*)dest,val); }

__inline__ __device__

unsigned int atomic_fetch_sub( volatile int64_t * const dest , const int64_t val )

{ return atomic_fetch_add(dest,-val); }

__inline__ __device__

unsigned int atomic_fetch_sub( volatile float * const dest , const float val )

{ return atomicAdd((float*)dest,-val); }

#if ( 600 <= __CUDA_ARCH__ )

__inline__ __device__

unsigned int atomic_fetch_sub( volatile double * const dest , const double val )

{ return atomicAdd((double*)dest,-val); }

#endif

template < typename T >

__inline__ __device__

T atomic_fetch_sub( volatile T * const dest ,