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#pragma OPENCL EXTENSION cl_khr_local_int32_base_atomics : enable         
                                                                          
																		  
#if mykernel == 1
__kernel void readKernel(volatile __global uint4 *in,
                         volatile __global uint  *out,                 
                         uint ni,                           
                         uint val,                          
                         uint nk)                          
{                                                                         
    uint pcount = 0;                                               
    __local uint lcount;                                                   
    uint i, idx;                                                   

   if(get_local_id(0) == 0)                                              
      lcount = 0;                                                           

   barrier(CLK_LOCAL_MEM_FENCE);                                        

   for(int n = 0; n < nk; n++)
   {
      for(i = 0, idx = get_global_id(0); i < ni; i++, idx += get_global_size(0))
      {                                                                   
         if(in[idx].x == val) 
             pcount++;                                   
         if(in[idx].y == val) 
             pcount++;                                   
         if(in[idx].z == val) 
             pcount++;                                   
         if(in[idx].w == val) 
             pcount++;                                   
      }         
   }

   (void)atomic_add(&lcount, pcount);                                  

   barrier(CLK_LOCAL_MEM_FENCE);                                        

   if(get_local_id(0) == 0)                                             
      out[get_group_id(0)] = lcount / nk;                                   

   if(get_global_id(0) == 0)                                            
      out[get_num_groups(0) + 1] = val;                                     

}                                                                         
#endif
#if mykernel == 2
__kernel void writeKernel(volatile __global uint *in,                 
                          volatile __global uint4 *out,                
                          uint ni,                           
                          uint val,                          
                          uint nk)                         
{                                                                         
    uint4 pval;                                                    
    __local uint  lval;                                                    
    uint i, idx;                                                           

   if(get_local_id(0) == 0)                                             
      lval = in[get_num_groups(0) + 1];                                     

   barrier( CLK_LOCAL_MEM_FENCE );                                        

   pval = (uint4)(lval, lval, lval, lval);                               

   for(int n = 0; n < nk; n++)                                                
   {
      for(i = 0, idx = get_global_id(0); i < ni; i++, idx += get_global_size(0))
      {                                                                   
          out[idx] = pval;                                                 
      }                                                                   
   }
}                                                                         
#endif
