| /* Copyright 1993-2016 NVIDIA Corporation. All rights reserved. | |
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| * NOTWITHSTANDING ANY TERMS OR CONDITIONS TO THE CONTRARY IN THE | |
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| */ | |
| _CG_BEGIN_NAMESPACE | |
| namespace details { | |
| template <typename TyVal, typename TyOp, unsigned int TySize, typename ParentT> | |
| _CG_QUALIFIER auto coalesced_reduce(const __single_warp_thread_block_tile<TySize, ParentT>& group, | |
| TyVal&& val, | |
| TyOp&& op) -> decltype(op(val, val)) { | |
| auto out = val; | |
| for (int mask = TySize >> 1; mask > 0; mask >>= 1) { | |
| out = op(out, group.shfl_xor(out, mask)); | |
| } | |
| return out; | |
| } | |
| template <typename TyVal, typename TyOp> | |
| _CG_QUALIFIER auto coalesced_reduce(const coalesced_group& group, TyVal&& val, TyOp&& op) -> decltype(op(val, val)) { | |
| if (group.size() == 32) { | |
| // Full coalesced group can go through faster path by being treated as a tile of size 32 | |
| auto tile = details::tiled_partition_internal<32, void>(); | |
| return coalesced_reduce(tile, _CG_STL_NAMESPACE::forward<TyVal>(val), _CG_STL_NAMESPACE::forward<TyOp>(op)); | |
| } | |
| else { | |
| auto scan_result = | |
| inclusive_scan_non_contiguous(group, _CG_STL_NAMESPACE::forward<TyVal>(val), _CG_STL_NAMESPACE::forward<TyOp>(op)); | |
| unsigned int group_mask = _coalesced_group_data_access::get_mask(group); | |
| unsigned int last_thread_id = 31 - __clz(group_mask); | |
| return details::tile::shuffle_dispatch<TyVal>::shfl( | |
| _CG_STL_NAMESPACE::forward<TyVal>(scan_result), group_mask, last_thread_id, 32); | |
| } | |
| } | |
| } // details | |
| _CG_END_NAMESPACE | |