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//------------------------------------------------------------------------------
// GraphBLAS/CUDA/template/GB_cuda_cumsum: cumlative sum of array on the GPU(s)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#ifndef GB_CUDA_CUMSUM
#define GB_CUDA_CUMSUM
#include <cub/cub.cuh>
#define GB_FREE_ALL \
{ \
cudaFree (d_temp_storage) ; \
}
typedef enum GB_cuda_cumsum_type
{
GB_CUDA_CUMSUM_EXCLUSIVE,
GB_CUDA_CUMSUM_INCLUSIVE
} GB_cuda_cumsum_type ;
__host__ GrB_Info GB_cuda_cumsum // compute the cumulative sum of an array
(
int64_t *__restrict__ out, // size n or n+1, output.
int64_t *__restrict__ in, // size n or n+1, input
// to do an in-place cumsum, pass out == in
const int64_t n,
cudaStream_t stream,
GB_cuda_cumsum_type type
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
ASSERT (in != NULL) ;
ASSERT (out != NULL) ;
ASSERT (n >= 0) ;
void *d_temp_storage = NULL;
size_t temp_storage_bytes = 0 ;
switch (type)
{
case GB_CUDA_CUMSUM_INCLUSIVE:
cub::DeviceScan::InclusiveSum (d_temp_storage, temp_storage_bytes,
in, out, n, stream) ;
break;
default:
cub::DeviceScan::ExclusiveSum (d_temp_storage, temp_storage_bytes,
in, out, n, stream) ;
}
CUDA_OK (cudaMalloc (&d_temp_storage, temp_storage_bytes)) ;
// Run
switch (type)
{
case GB_CUDA_CUMSUM_INCLUSIVE:
cub::DeviceScan::InclusiveSum (d_temp_storage, temp_storage_bytes,
in, out, n, stream) ;
break;
default:
cub::DeviceScan::ExclusiveSum (d_temp_storage, temp_storage_bytes,
in, out, n, stream) ;
}
cudaFree (d_temp_storage) ;
return GrB_SUCCESS;
}
#endif
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