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//------------------------------------------------------------------------------
// GB_transpose_sparse_template: C=op(cast(A')), transpose, typecast, & apply op
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
{
//--------------------------------------------------------------------------
// get inputs
//--------------------------------------------------------------------------
#undef GBh_AB
#ifdef GB_BIND_1ST
// see discussion in GB_transpose_template.c
GB_Bp_DECLARE (Ap, const) ; GB_Bp_PTR (Ap, A) ;
GB_Bh_DECLARE (Ah, const) ; GB_Bh_PTR (Ah, A) ;
GB_Bi_DECLARE (Ai, const) ; GB_Bi_PTR (Ai, A) ;
#define GBh_AB(Ah,k) GBh_B(Ah,k)
#else
GB_Ap_DECLARE (Ap, const) ; GB_Ap_PTR (Ap, A) ;
GB_Ah_DECLARE (Ah, const) ; GB_Ah_PTR (Ah, A) ;
GB_Ai_DECLARE (Ai, const) ; GB_Ai_PTR (Ai, A) ;
#define GBh_AB(Ah,k) GBh_A(Ah,k)
#endif
GB_Ci_DECLARE (Ci, ) ; GB_Ci_PTR (Ci, C) ;
//--------------------------------------------------------------------------
// C = A'
//--------------------------------------------------------------------------
if (nthreads == 1)
{
//----------------------------------------------------------------------
// sequential method
//----------------------------------------------------------------------
// Cp and workspace are of type GB_W_TYPE
GB_W_TYPE *restrict workspace = (GB_W_TYPE *) (Workspaces [0]) ;
const int64_t anvec = A->nvec ;
for (int64_t k = 0 ; k < anvec ; k++)
{
// iterate over the entries in A(:,j)
int64_t j = GBh_AB (Ah, k) ;
int64_t pA_start = GB_IGET (Ap, k) ;
int64_t pA_end = GB_IGET (Ap, k+1) ;
for (int64_t pA = pA_start ; pA < pA_end ; pA++)
{
// C(j,i) = A(i,j)
int64_t i = GB_IGET (Ai, pA) ;
GB_W_TYPE pC = workspace [i]++ ;
// Ci [pC] = j ;
GB_ISET (Ci, pC, j) ;
#ifndef GB_ISO_TRANSPOSE
// Cx [pC] = op (Ax [pA])
GB_APPLY_OP (pC, pA) ;
#endif
}
}
}
else if (nworkspaces == 1)
{
//----------------------------------------------------------------------
// atomic method
//----------------------------------------------------------------------
GB_W_TYPE *restrict workspace = (GB_W_TYPE *) (Workspaces [0]) ;
int tid ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (tid = 0 ; tid < nthreads ; tid++)
{
for (int64_t k = A_slice [tid] ; k < A_slice [tid+1] ; k++)
{
// iterate over the entries in A(:,j)
int64_t j = GBh_AB (Ah, k) ;
int64_t pA_start = GB_IGET (Ap, k) ;
int64_t pA_end = GB_IGET (Ap, k+1) ;
for (int64_t pA = pA_start ; pA < pA_end ; pA++)
{
// C(j,i) = A(i,j)
int64_t i = GB_IGET (Ai, pA) ;
// do this atomically: pC = workspace [i]++
GB_W_TYPE pC ;
GB_ATOMIC_CAPTURE_INC (pC, workspace [i]) ;
// Ci [pC] = j ;
GB_ISET (Ci, pC, j) ;
#ifndef GB_ISO_TRANSPOSE
// Cx [pC] = op (Ax [pA])
GB_APPLY_OP (pC, pA) ;
#endif
}
}
}
}
else
{
//----------------------------------------------------------------------
// non-atomic method
//----------------------------------------------------------------------
int tid ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (tid = 0 ; tid < nthreads ; tid++)
{
GB_W_TYPE *restrict workspace = (GB_W_TYPE *) (Workspaces [tid]) ;
for (int64_t k = A_slice [tid] ; k < A_slice [tid+1] ; k++)
{
// iterate over the entries in A(:,j)
int64_t j = GBh_AB (Ah, k) ;
int64_t pA_start = GB_IGET (Ap, k) ;
int64_t pA_end = GB_IGET (Ap, k+1) ;
for (int64_t pA = pA_start ; pA < pA_end ; pA++)
{
// C(j,i) = A(i,j)
int64_t i = GB_IGET (Ai, pA) ;
GB_W_TYPE pC = workspace [i]++ ;
// Ci [pC] = j ;
GB_ISET (Ci, pC, j) ;
#ifndef GB_ISO_TRANSPOSE
// Cx [pC] = op (Ax [pA])
GB_APPLY_OP (pC, pA) ;
#endif
}
}
}
}
}
#undef GB_W_TYPE
#undef GB_ATOMIC_CAPTURE_INC
#undef GBh_AB
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