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#ifndef _BLOCK_SPGEMM_H_
#define _BLOCK_SPGEMM_H_
#include "CombBLAS.h"
namespace combblas
{
template <typename IT,
typename NTA,
typename DERA,
typename NTB,
typename DERB>
struct BlockSpGEMM
{
private:
std::vector<std::vector<SpParMat<IT, NTA, DERA>>> A_blocks_;
std::vector<std::vector<SpParMat<IT, NTB, DERB>>> B_blocks_;
int br_, bc_, bi_, cur_block_;
IT nr_, nc_;
public:
BlockSpGEMM (SpParMat<IT, NTA, DERA> &A,
SpParMat<IT, NTB, DERB> &B,
int br,
int bc,
int bi = 1
) :
br_(br), bc_(bc), bi_(bi), cur_block_(0)
{
A_blocks_ = A.BlockSplit(br_, bi_);
B_blocks_ = B.BlockSplit(bi_, bc_);
nr_ = A.getnrow();
nc_ = B.getncol();
}
template<typename SR,
typename NTC,
typename DERC>
SpParMat<IT, NTC, DERC>
getNextBlock (IT &roffset, IT &coffset)
{
assert(bi_ == 1);
int rbid = cur_block_ / bc_;
int cbid = cur_block_ % bc_;
++cur_block_;
IT bs = nr_ / br_;
IT r = nr_ % br_;
roffset = (std::min(static_cast<IT>(rbid), r)*(bs+1)) +
((rbid < r ? 0 : rbid-r)*bs);
// (std::max(static_cast<IT>(0), rbid-r)*bs);
bs = nc_ / bc_;
r = nc_ % bc_;
coffset = (std::min(static_cast<IT>(cbid), r)*(bs+1)) +
((cbid < r ? 0 : cbid-r)*bs);
// (std::max(static_cast<IT>(0), cbid-r)*bs);
return Mult_AnXBn_DoubleBuff<SR, NTC, DERC>
(A_blocks_[rbid][0], B_blocks_[0][cbid], false, false);
}
bool
hasNext ()
{
return cur_block_ < br_*bc_;
}
template<typename SR,
typename NTC,
typename DERC>
SpParMat<IT, NTC, DERC>
getBlockId (int rbid, int cbid, IT &roffset, IT &coffset)
{
assert(bi_ == 1);
IT bs = nr_ / br_;
IT r = nr_ % br_;
roffset = (std::min(static_cast<IT>(rbid), r)*(bs+1)) +
((rbid < r ? 0 : rbid-r)*bs);
// (std::max(static_cast<IT>(0), rbid-r)*bs);
bs = nc_ / bc_;
r = nc_ % bc_;
coffset = (std::min(static_cast<IT>(cbid), r)*(bs+1)) +
((cbid < r ? 0 : cbid-r)*bs);
// (std::max(static_cast<IT>(0), cbid-r)*bs);
return Mult_AnXBn_DoubleBuff<SR, NTC, DERC>
(A_blocks_[rbid][0], B_blocks_[0][cbid], false, false);
}
std::vector<IT>
getBlockOffsets (bool is_row)
{
IT bs = nr_ / br_;
IT r = nr_ % br_;
if (!is_row)
{
bs = nc_ / bc_;
r = nc_ % bc_;
}
int nblocks = (is_row ? br_ : bc_);
std::vector<IT> offsets(nblocks+1);
for (int b = 0; b < nblocks; ++b)
offsets[b] = (std::min(static_cast<IT>(b), r)*(bs+1)) +
((b < r ? 0 : b-r)*bs);
offsets[nblocks] = (is_row ? nr_ : nc_);
return offsets;
}
};
}
#endif
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