File size: 17,486 Bytes
47993d5 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 | /* Copyright 1993-2016 NVIDIA Corporation. All rights reserved.
*
* NOTICE TO LICENSEE:
*
* The source code and/or documentation ("Licensed Deliverables") are
* subject to NVIDIA intellectual property rights under U.S. and
* international Copyright laws.
*
* The Licensed Deliverables contained herein are PROPRIETARY and
* CONFIDENTIAL to NVIDIA and are being provided under the terms and
* conditions of a form of NVIDIA software license agreement by and
* between NVIDIA and Licensee ("License Agreement") or electronically
* accepted by Licensee. Notwithstanding any terms or conditions to
* the contrary in the License Agreement, reproduction or disclosure
* of the Licensed Deliverables to any third party without the express
* written consent of NVIDIA is prohibited.
*
* NOTWITHSTANDING ANY TERMS OR CONDITIONS TO THE CONTRARY IN THE
* LICENSE AGREEMENT, NVIDIA MAKES NO REPRESENTATION ABOUT THE
* SUITABILITY OF THESE LICENSED DELIVERABLES FOR ANY PURPOSE. THEY ARE
* PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY OF ANY KIND.
* NVIDIA DISCLAIMS ALL WARRANTIES WITH REGARD TO THESE LICENSED
* DELIVERABLES, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
* NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE.
* NOTWITHSTANDING ANY TERMS OR CONDITIONS TO THE CONTRARY IN THE
* LICENSE AGREEMENT, IN NO EVENT SHALL NVIDIA BE LIABLE FOR ANY
* SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OR ANY
* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THESE LICENSED DELIVERABLES.
*
* U.S. Government End Users. These Licensed Deliverables are a
* "commercial item" as that term is defined at 48 C.F.R. 2.101 (OCT
* 1995), consisting of "commercial computer software" and "commercial
* computer software documentation" as such terms are used in 48
* C.F.R. 12.212 (SEPT 1995) and are provided to the U.S. Government
* only as a commercial end item. Consistent with 48 C.F.R.12.212 and
* 48 C.F.R. 227.7202-1 through 227.7202-4 (JUNE 1995), all
* U.S. Government End Users acquire the Licensed Deliverables with
* only those rights set forth herein.
*
* Any use of the Licensed Deliverables in individual and commercial
* software must include, in the user documentation and internal
* comments to the code, the above Disclaimer and U.S. Government End
* Users Notice.
*/
#ifndef _CG_SCAN_H_
#define _CG_SCAN_H_
#include "info.h"
#include "helpers.h"
#include "functional.h"
#include "coalesced_scan.h"
_CG_BEGIN_NAMESPACE
namespace details {
// Group support for scan.
template <class TyGroup> struct _scan_group_supported : public _CG_STL_NAMESPACE::false_type {};
template <unsigned int Sz, typename TyPar>
struct _scan_group_supported<cooperative_groups::thread_block_tile<Sz, TyPar>> : public _CG_STL_NAMESPACE::true_type {};
template <unsigned int Sz, typename TyPar>
struct _scan_group_supported<internal_thread_block_tile<Sz, TyPar>> : public _CG_STL_NAMESPACE::true_type {};
template <>
struct _scan_group_supported<cooperative_groups::coalesced_group> : public _CG_STL_NAMESPACE::true_type {};
template <typename TyGroup>
using scan_group_supported = _scan_group_supported<details::remove_qual<TyGroup>>;
template <bool IsIntegralPlus>
struct integral_optimized_scan;
enum class ScanType { exclusive, inclusive };
template <unsigned int GroupId, ScanType TyScan>
struct scan_dispatch;
template <ScanType TyScan>
struct scan_dispatch<details::coalesced_group_id, TyScan> {
template <typename TyGroup, typename TyVal, typename TyFn>
_CG_STATIC_QUALIFIER auto scan(const TyGroup& group, TyVal&& val, TyFn&& op) -> decltype(op(val, val)) {
auto scan_result = coalesced_inclusive_scan(group, val, op);
if (TyScan == ScanType::exclusive) {
scan_result = convert_inclusive_to_exclusive(group,
scan_result,
_CG_STL_NAMESPACE::forward<TyVal>(val),
_CG_STL_NAMESPACE::forward<TyFn>(op));
}
return scan_result;
}
};
#if defined(_CG_CPP11_FEATURES)
template <ScanType TyScan>
struct scan_dispatch<details::multi_tile_group_id, TyScan> {
template <unsigned int Size, typename ParentT, typename TyVal, typename TyFn>
_CG_STATIC_QUALIFIER auto scan(const thread_block_tile<Size, ParentT>& group, TyVal&& val, TyFn&& op) -> decltype(op(val, val)) {
using warpType = details::internal_thread_block_tile<32, __static_size_multi_warp_tile_base<Size>>;
using TyRet = details::remove_qual<TyVal>;
const unsigned int num_warps = Size / 32;
// In warp scan result, calculated in warp_lambda
TyRet warp_scan;
// In warp scan, put sum in the warp_scratch_location
auto warp_lambda = [&] (const warpType& warp, TyRet* warp_scratch_location) {
warp_scan =
details::coalesced_inclusive_scan(warp, _CG_STL_NAMESPACE::forward<TyVal>(val), op);
if (warp.thread_rank() + 1 == warp.size()) {
*warp_scratch_location = warp_scan;
}
if (TyScan == ScanType::exclusive) {
warp_scan = warp.shfl_up(warp_scan, 1);
}
};
// Tile of size num_warps performing the final scan part (exclusive scan of warp sums), other threads will add it
// to its in-warp scan result
auto inter_warp_lambda =
[&] (const details::internal_thread_block_tile<num_warps, warpType>& subwarp, TyRet* thread_scratch_location) {
auto thread_val = *thread_scratch_location;
auto result = coalesced_inclusive_scan(subwarp, thread_val, op);
*thread_scratch_location = convert_inclusive_to_exclusive(subwarp, result, thread_val, op);
};
TyRet previous_warps_sum = details::multi_warp_collectives_helper<TyRet>(group, warp_lambda, inter_warp_lambda);
if (TyScan == ScanType::exclusive && warpType::thread_rank() == 0) {
return previous_warps_sum;
}
if (warpType::meta_group_rank() == 0) {
return warp_scan;
}
else {
return op(warp_scan, previous_warps_sum);
}
}
};
#if defined(_CG_HAS_STL_ATOMICS)
template <unsigned int GroupId, ScanType TyScan>
struct scan_update_dispatch;
template <ScanType TyScan>
struct scan_update_dispatch<details::coalesced_group_id, TyScan> {
template <typename TyGroup, typename TyAtomic, typename TyVal, typename TyFn>
_CG_STATIC_QUALIFIER auto scan(const TyGroup& group, TyAtomic& dst, TyVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::remove_qual<TyVal> old;
// Do regular in group scan
auto scan_result = details::coalesced_inclusive_scan(group, val, op);
// Last thread updates the atomic and distributes its old value to other threads
if (group.thread_rank() == group.size() - 1) {
old = atomic_update(dst, scan_result, _CG_STL_NAMESPACE::forward<TyFn>(op));
}
old = group.shfl(old, group.size() - 1);
if (TyScan == ScanType::exclusive) {
scan_result = convert_inclusive_to_exclusive(group, scan_result, _CG_STL_NAMESPACE::forward<TyVal>(val), op);
}
scan_result = op(old, scan_result);
return scan_result;
}
};
template <ScanType TyScan>
struct scan_update_dispatch<details::multi_tile_group_id, TyScan> {
template <unsigned int Size, typename ParentT, typename TyAtomic, typename TyVal, typename TyFn>
_CG_STATIC_QUALIFIER auto scan(const thread_block_tile<Size, ParentT>& group, TyAtomic& dst, TyVal&& val, TyFn&& op) -> decltype(op(val, val)) {
using warpType = details::internal_thread_block_tile<32, __static_size_multi_warp_tile_base<Size>>;
using TyRet = details::remove_qual<TyVal>;
const unsigned int num_warps = Size / 32;
// In warp scan result, calculated in warp_lambda
TyRet warp_scan;
// In warp scan, put sum in the warp_scratch_location
auto warp_lambda = [&] (const warpType& warp, TyRet* warp_scratch_location) {
warp_scan =
details::coalesced_inclusive_scan(warp, _CG_STL_NAMESPACE::forward<TyVal>(val), op);
if (warp.thread_rank() + 1 == warp.size()) {
*warp_scratch_location = warp_scan;
}
if (TyScan == ScanType::exclusive) {
warp_scan = warp.shfl_up(warp_scan, 1);
}
};
// Tile of size num_warps performing the final scan part (exclusive scan of warp sums), other threads will add it
// to its in-warp scan result
auto inter_warp_lambda =
[&] (const details::internal_thread_block_tile<num_warps, warpType>& subwarp, TyRet* thread_scratch_location) {
auto thread_val = *thread_scratch_location;
auto scan_result = details::coalesced_inclusive_scan(subwarp, thread_val, op);
TyRet offset;
// Single thread does the atomic update with sum of all contributions and reads the old value.
if (subwarp.thread_rank() == subwarp.size() - 1) {
offset = details::atomic_update(dst, scan_result, op);
}
offset = subwarp.shfl(offset, subwarp.size() - 1);
scan_result = convert_inclusive_to_exclusive(subwarp, scan_result, thread_val, op);
// Add offset read from the atomic to the scanned warp sum.
// Skipping first thread, since it got defautly constructed value from the conversion,
// it should just return the offset received from the thread that did the atomic update.
if (subwarp.thread_rank() != 0) {
offset = op(scan_result, offset);
}
*thread_scratch_location = offset;
};
TyRet previous_warps_sum = details::multi_warp_collectives_helper<TyRet>(group, warp_lambda, inter_warp_lambda);
if (TyScan == ScanType::exclusive && warpType::thread_rank() == 0) {
return previous_warps_sum;
}
return op(warp_scan, previous_warps_sum);
}
};
#endif
#endif
template <typename TyGroup, typename TyInputVal, typename TyRetVal>
_CG_QUALIFIER void check_scan_params() {
static_assert(details::is_op_type_same<TyInputVal, TyRetVal>::value, "Operator input and output types differ");
static_assert(details::scan_group_supported<TyGroup>::value, "This group does not exclusively represent a tile");
}
#if defined(_CG_HAS_STL_ATOMICS)
template <typename TyGroup, typename TyDstVal, typename TyInputVal, typename TyRetVal>
_CG_QUALIFIER void check_scan_update_params() {
check_scan_params<TyGroup, TyInputVal, TyRetVal>();
static_assert(details::is_op_type_same<TyDstVal, TyInputVal>::value, "Destination and input types differ");
}
#endif
} // details
template <typename TyGroup, typename TyVal, typename TyFn>
_CG_QUALIFIER auto inclusive_scan(const TyGroup& group, TyVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::check_scan_params<TyGroup, TyVal, decltype(op(val, val))>();
using dispatch = details::scan_dispatch<TyGroup::_group_id, details::ScanType::inclusive>;
return dispatch::scan(group, _CG_STL_NAMESPACE::forward<TyVal>(val), _CG_STL_NAMESPACE::forward<TyFn>(op));
}
template <typename TyGroup, typename TyVal>
_CG_QUALIFIER details::remove_qual<TyVal> inclusive_scan(const TyGroup& group, TyVal&& val) {
return inclusive_scan(group, _CG_STL_NAMESPACE::forward<TyVal>(val), cooperative_groups::plus<details::remove_qual<TyVal>>());
}
template <typename TyGroup, typename TyVal, typename TyFn>
_CG_QUALIFIER auto exclusive_scan(const TyGroup& group, TyVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::check_scan_params<TyGroup, TyVal, decltype(op(val, val))>();
using dispatch = details::scan_dispatch<TyGroup::_group_id, details::ScanType::exclusive>;
return dispatch::scan(group, _CG_STL_NAMESPACE::forward<TyVal>(val), _CG_STL_NAMESPACE::forward<TyFn>(op));
}
template <typename TyGroup, typename TyVal>
_CG_QUALIFIER details::remove_qual<TyVal> exclusive_scan(const TyGroup& group, TyVal&& val) {
return exclusive_scan(group, _CG_STL_NAMESPACE::forward<TyVal>(val), cooperative_groups::plus<details::remove_qual<TyVal>>());
}
#if defined(_CG_HAS_STL_ATOMICS)
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco, typename TyFn>
_CG_QUALIFIER auto inclusive_scan_update(const TyGroup& group, cuda::atomic<TyVal, Sco>& dst, TyInputVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::check_scan_update_params<TyGroup, TyVal, details::remove_qual<TyInputVal>, decltype(op(val, val))>();
using dispatch = details::scan_update_dispatch<TyGroup::_group_id, details::ScanType::inclusive>;
return dispatch::scan(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), _CG_STL_NAMESPACE::forward<TyFn>(op));
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco>
_CG_QUALIFIER TyVal inclusive_scan_update(const TyGroup& group, cuda::atomic<TyVal, Sco> & dst, TyInputVal&& val) {
return inclusive_scan_update(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), cooperative_groups::plus<TyVal>());
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco, typename TyFn>
_CG_QUALIFIER auto exclusive_scan_update(const TyGroup& group, cuda::atomic<TyVal, Sco>& dst, TyInputVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::check_scan_update_params<TyGroup, TyVal, details::remove_qual<TyInputVal>, decltype(op(val, val))>();
using dispatch = details::scan_update_dispatch<TyGroup::_group_id, details::ScanType::exclusive>;
return dispatch::scan(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), _CG_STL_NAMESPACE::forward<TyFn>(op));
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco>
_CG_QUALIFIER TyVal exclusive_scan_update(const TyGroup& group, cuda::atomic<TyVal, Sco>& dst, TyInputVal&& val) {
return exclusive_scan_update(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), cooperative_groups::plus<TyVal>());
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco, typename TyFn>
_CG_QUALIFIER auto inclusive_scan_update(const TyGroup& group, const cuda::atomic_ref<TyVal, Sco>& dst, TyInputVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::check_scan_update_params<TyGroup, TyVal, details::remove_qual<TyInputVal>, decltype(op(val, val))>();
using dispatch = details::scan_update_dispatch<TyGroup::_group_id, details::ScanType::inclusive>;
return dispatch::scan(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), _CG_STL_NAMESPACE::forward<TyFn>(op));
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco>
_CG_QUALIFIER TyVal inclusive_scan_update(const TyGroup& group, const cuda::atomic_ref<TyVal, Sco> & dst, TyInputVal&& val) {
return inclusive_scan_update(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), cooperative_groups::plus<TyVal>());
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco, typename TyFn>
_CG_QUALIFIER auto exclusive_scan_update(const TyGroup& group, const cuda::atomic_ref<TyVal, Sco>& dst, TyInputVal&& val, TyFn&& op) -> decltype(op(val, val)) {
details::check_scan_update_params<TyGroup, TyVal, details::remove_qual<TyInputVal>, decltype(op(val, val))>();
using dispatch = details::scan_update_dispatch<TyGroup::_group_id, details::ScanType::exclusive>;
return dispatch::scan(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), _CG_STL_NAMESPACE::forward<TyFn>(op));
}
template<typename TyGroup, typename TyVal, typename TyInputVal, cuda::thread_scope Sco>
_CG_QUALIFIER TyVal exclusive_scan_update(const TyGroup& group, const cuda::atomic_ref<TyVal, Sco>& dst, TyInputVal&& val) {
return exclusive_scan_update(group, dst, _CG_STL_NAMESPACE::forward<TyInputVal>(val), cooperative_groups::plus<TyVal>());
}
#endif
_CG_END_NAMESPACE
#endif // _CG_SCAN_H_
|