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SCC_true_parallel.cl
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SCC_true_parallel.cl
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#pragma OPENCL EXTENSION cl_khr_int64_extended_atomics : enable
bool isRangeSet(int tags){return (tags&16);}
void setTrim1(int*tags) { *tags = ( *tags | 32); };
bool isTrim1(int tags) { return ( tags & 32); }
void setTrim2(int *tags) { *tags = ( *tags | 64); };
bool isTrim2(int tags) { return ( tags & 64); };
bool isForwardVisited(int tags){ return (tags & 1);}
bool isForwardPropagate(int tags){ return (tags & 4);}
void setForwardPropagateBit(int *tags) { *tags = ( *tags | 4); };
void clearForwardPropagateBit(int *tags){*tags = ( *tags ^ 4); };
void rangeSet(int *tags) { *tags = ( *tags | 16); };
bool isBackwardVisited(int tags) { return (tags & 2); }
bool isBackwardPropagate(int tags) { return ( tags & 8); }
void setBackwardPropagateBit(int *tags) { *tags = ( *tags | 8); };
void clearBackwardPropagateBit(int *tags){ *tags = ( *tags ^ 8);};
bool isForwardProcessed(int tags){return (tags&256);};
void clearForwardProcessed(int *tags){ *tags = (*tags ^ 256);};
bool isBackwardProcessed(int tags){return (tags&512);};
void clearBackwardProcessed(int *tags){ *tags = (*tags ^ 512);};
__global int in_vertex=0,out_vertex=0;
void setPivot(int *tags) { *tags = ( *tags | 128); };
bool isPivot(int tags) { return ( tags & 128); }
//kernel_arr[0]
__kernel void trim1(__global int *range,
__global int *tags,
__global int *Fc,
__global int *Fr,
__global int *Bc,
__global int *Br,
__global unsigned *colors,
__global int *terminate,
__global int *trim1_cnt )
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(isTrim1(tags[vertex]))
return;
// printf("Hello,vertex=%d\n",vertex);
bool eliminate=true;
int starting_index=Br[vertex];
int ending_index=Br[vertex+1];
// printf("vertex=%d,starting_index=%d,end_index=%d\n",
// vertex,starting_index,ending_index);
for(int i=starting_index;i<ending_index;i++)
{
int neighbour_vertex=Bc[i];
if(!isTrim1(tags[neighbour_vertex]) && colors[vertex]==colors[neighbour_vertex])
{
eliminate=false;
break;
}
}
if(!eliminate)
{
eliminate=true;
starting_index=Fr[vertex];
ending_index=Fr[vertex+1];
for(int i=starting_index;i<ending_index;i++)
{
int neighbour_vertex=Fc[i];
if(neighbour_vertex<0)
{
printf("This is the culprit1,vertex=%d,i=%d\n",vertex,i);
}
else if(neighbour_vertex>3774768)
{
printf("This is the culprit2,vertex=%d,i=%d\n",vertex,i);
}
if(!isTrim1(tags[neighbour_vertex]) && colors[vertex]==colors[neighbour_vertex])
{
eliminate=false;
break;
}
}
}
if(eliminate)
{
setTrim1(&tags[vertex]);
*terminate=false;
atomic_add(trim1_cnt,1);
// printf("tags:%d,vertex:%d\n",tags[vertex],vertex);
}
}
}
//kernel_arr[1]
__kernel void pollforfirstpivot(__global int*tags,
__global long int*pivot_criteria,
__global int*Fr,
__global int*Br)
{
//please set pivot_criteria to infinity in host code
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
long int current_deg_product=
(long int)(Fr[vertex+1]-Fr[vertex])*((long int)(Br[vertex+1]-Br[vertex]));
atom_max(pivot_criteria,current_deg_product);
//printf("The value of deg_prod=%d\n",*pivot_criteria);
}
}
}
//kernel_arr[2]
__kernel void selectfirstpivot(__global int*tags,
__global int*pivot_fields,
__global long int*pivot_criteria,
__global int*Fr,
__global int*Br)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
long int current_deg_product=
(long int)(Fr[vertex+1]-Fr[vertex])*((long int)(Br[vertex+1]-Br[vertex]));
//printf("current deg product=%d,pivot criteria=%d\n",current_deg_product,*pivot_criteria);
if(current_deg_product==(*pivot_criteria))
{
//atomic_xchg(&pivot_fields[0],vertex);
if(atomic_cmpxchg(&pivot_fields[0],0,vertex)==0)
{
setBackwardPropagateBit(&tags[vertex]);
setForwardPropagateBit(&tags[vertex]);
setPivot(&tags[vertex]);
// printf("pivot=%d\n",vertex);
// atomic_add(pivot_count,1);
}
}
}
}
}
__kernel void fwd_kernel(__global int *Fr,
__global int *Fc,
__global int *tags,
__global unsigned *colors,
__global bool *terminatef
)
{
int vertex=get_global_id(0);
if(vertex>0)
{
//printf("vertex=%d,color=%d\n",vertex,colors[vertex]);
if(!isTrim1(tags[vertex]))
{
if(isForwardPropagate(tags[vertex]))
{
if(!isForwardProcessed(atomic_xchg(&tags[vertex],tags[vertex]|256)))
{
int starting_index=Fr[vertex];
int ending_index=Fr[vertex+1];
for(int i=starting_index;i<ending_index;i++)
{
int neighbour_vertex=Fc[i];
if(colors[vertex]==colors[neighbour_vertex] && !isTrim1(tags[neighbour_vertex]))
{
setForwardPropagateBit(&tags[neighbour_vertex]);
*terminatef=false;
}
}
}
}
}
}
}
__kernel void bwd_kernel(__global int *Br,
__global int *Bc,
__global int *tags,
__global unsigned *colors,
__global bool *terminateb
)
{
int vertex=get_global_id(0);
if(vertex>0)
{
//printf("vertex=%d,color=%d\n",vertex,colors[vertex]);
if(!isTrim1(tags[vertex]))
{
if(isBackwardPropagate(tags[vertex]))
{
if(!isBackwardProcessed(atomic_xchg(&tags[vertex],tags[vertex]|512)))
{
int starting_index=Br[vertex];
int ending_index=Br[vertex+1];
for(int i=starting_index;i<ending_index;i++)
{
int neighbour_vertex=Bc[i];
if(colors[vertex]==colors[neighbour_vertex] && !isTrim1(tags[neighbour_vertex]))
{
setBackwardPropagateBit(&tags[neighbour_vertex]);
*terminateb=false;
//printf("vertex=%d,neighbour=%d\n",vertex,neighbour_vertex);
}
}
}
}
}
}
}
__kernel void update(__global unsigned *colors,
__global int *tags,
__global bool *terminate
)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
if(isForwardPropagate(tags[vertex]) && isBackwardPropagate(tags[vertex]))
{
setTrim1(&tags[vertex]);
}
else
{
*terminate=false;
if(isForwardPropagate(tags[vertex])&&(!isBackwardPropagate(tags[vertex])))
{
colors[vertex]=3*colors[vertex];
clearForwardProcessed(&tags[vertex]);
clearForwardPropagateBit(&tags[vertex]);
}
else if(isBackwardPropagate(tags[vertex])&& (!isForwardPropagate(tags[vertex])))
{
colors[vertex]=3*colors[vertex]+1;
clearBackwardProcessed(&tags[vertex]);
clearBackwardPropagateBit(&tags[vertex]);
}
else if((!isForwardPropagate(tags[vertex])&&(!isBackwardPropagate(tags[vertex]))))
{
colors[vertex]=3*colors[vertex]+2;
}
}
}
}
}
__kernel void trim2(__global int *range,
__global int *tags,
__global int *Fc,
__global int *Fr,
__global int *Bc,
__global int *Br,
__global unsigned *colors,
__global bool *terminate)
{
int vertex=get_global_id(0);
bool eliminate=false;
if(vertex>0)
{
if(!isTrim1(vertex))
{
int outdegree=0;
int sole_neighbour=-1;
int starting_index=Fr[vertex];
int end_index=Fr[vertex+1];
for(int i=starting_index;i<end_index;i++)
{
int neighbour=Fc[i];
if(!isTrim1(tags[neighbour]) && colors[neighbour]==colors[vertex])
{
outdegree++;
sole_neighbour=neighbour;
}
}
if(outdegree==1)
{
outdegree=0;
starting_index=Fr[sole_neighbour];
end_index=Fr[sole_neighbour+1];
int back_neighbour=-1;
for(int i=starting_index;i<end_index;i++)
{
int neighbour=Fc[i];
if(!isTrim1(tags[neighbour]) && colors[neighbour]==colors[vertex])
{
outdegree++;
back_neighbour=neighbour;
}
}
if(outdegree==1 && back_neighbour==vertex)
{
setTrim1(&tags[vertex]);
setTrim2(&tags[vertex]);
setTrim1(&tags[sole_neighbour]);
setTrim2(&tags[sole_neighbour]);
eliminate=true;
}
}
if(!eliminate)
{
int indegree=0;
starting_index=Br[vertex];
end_index=Br[vertex+1];
sole_neighbour=-1;
for(int i=starting_index;i<end_index;i++)
{
int neighbour=Bc[i];
if(!isTrim1(tags[neighbour]) && colors[neighbour]==colors[vertex])
{
indegree++;
sole_neighbour=neighbour;
}
}
if(indegree==1)
{
indegree=0;
starting_index=Br[sole_neighbour];
end_index=Br[sole_neighbour+1];
int back_neighbour=-1;
for(int i=starting_index;i<end_index;i++)
{
int neighbour=Bc[i];
if(!isTrim1(tags[neighbour]) && colors[neighbour]==colors[vertex])
{
indegree++;
back_neighbour=neighbour;
}
}
if(indegree==1 && back_neighbour==vertex)
{
setTrim1(&tags[vertex]);
setTrim2(&tags[vertex]);
setTrim1(&tags[sole_neighbour]);
setTrim2(&tags[sole_neighbour]);
eliminate=true;
}
}
}
}
}
if(eliminate)
{
*terminate=false;
}
}
__kernel void assign_self_root(__global int *WCC,
__global int *tags)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
WCC[vertex]=vertex;
}
}
}
__kernel void assign_WCC_roots(__global int *WCC,
__global int *tags,
__global unsigned *colors,
__global int *Fr,
__global int *Fc,
__global bool *terminate)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
int starting_index=Fr[vertex];
int ending_index=Fr[vertex+1];
for(int i=starting_index;i<ending_index;i++)
{
int neighbour_vertex=Fc[i];
if(!isTrim1(tags[neighbour_vertex]))
{
if(colors[neighbour_vertex]==colors[vertex])
{
if(WCC[neighbour_vertex]<WCC[vertex])
{
WCC[vertex]=WCC[neighbour_vertex];
*terminate=false;
}
}
}
}
}
}
}
__kernel void shorten_paths(__global int *WCC,
__global int *tags,
__global bool *terminate
)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
int k=WCC[vertex];
if(k!=vertex && k!=WCC[k])
{
WCC[vertex]=WCC[k];
*terminate=false;
}
}
}
}
__kernel void color_WCC(__global int *WCC,
__global int *tags,
__global unsigned *colors)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex]))
{
// atomic_add(&in_vertex,1);
// printf("in vertex=%d\n",in_vertex);
int k=WCC[vertex];
colors[vertex]=WCC[vertex];
// atomic_add(&out_vertex,1);
// printf("out vertex=%d\n",out_vertex);
}
}
}
__kernel void pollforpivots(__global unsigned *colors,
__global int *tags,
__global int *Fr,
__global int *Br,
__global long int *max_criteria,
__global int *vertex_count)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex])){
unsigned c=colors[vertex];
if(c<0)
{
printf("This is the culprit");
}
long int newdegree=((long int)(Fr[vertex+1]-Fr[vertex]))
*((long int)(Br[vertex+1]-Br[vertex]));
atomic_max(&max_criteria[c%(*vertex_count)],newdegree);
}
}
}
__kernel void selectpivots(__global unsigned *colors,
__global int *tags,
__global int *Fr,
__global int *Br,
__global long int *max_criteria,
__global int *pivot_fields,
__global int *vertex_count
)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(!isTrim1(tags[vertex])){
unsigned c=colors[vertex];
long int newdegree=((long int)(Fr[vertex+1]-Fr[vertex]))
*((long int)(Br[vertex+1]-Br[vertex]));
if(newdegree==max_criteria[c%(*vertex_count)])
{
//pivot_fields[c%(*vertex_count)]=vertex;
if(atomic_cmpxchg(&pivot_fields[c%(*vertex_count)],0,vertex)==0)
{
setBackwardPropagateBit(&tags[vertex]);
setForwardPropagateBit(&tags[vertex]);
setPivot(&tags[vertex]);
printf("pivot=%d\n",vertex);
// atomic_add(pivot_count,1);
}
}
}
}
}
__kernel void remaining_vertices(__global int *tags,
__global int *counter)
{
int vertex=get_global_id(0);
if(vertex>0)
{
if(isPivot(tags[vertex]))
{
atomic_add(counter,1);
}
}
}