MPI_Datatype dtype, MPI_Op op,
MPI_Comm comm)
{
int tag = COLL_TAG_ALLREDUCE;
unsigned int mask, pof2, i, recv_idx, last_idx, send_idx, send_cnt;
MPI_Datatype dtype, MPI_Op op,
MPI_Comm comm)
{
int tag = COLL_TAG_ALLREDUCE;
unsigned int mask, pof2, i, recv_idx, last_idx, send_idx, send_cnt;