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* Copyright 1993-2022 NVIDIA Corporation. All rights reserved.
*
* NOTICE TO LICENSEE:
*
* This source code and/or documentation ("Licensed Deliverables") are
* subject to NVIDIA intellectual property rights under U.S. and
* international Copyright laws.
*
* These Licensed Deliverables contained herein is PROPRIETARY and
* CONFIDENTIAL to NVIDIA and is 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. IT IS
* 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 is 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_INVOKE_H
#define _CG_INVOKE_H
#include "info.h"
#include "helpers.h"
#if defined(_CG_CPP11_FEATURES)
_CG_BEGIN_NAMESPACE
namespace details {
template <typename Group>
struct _elect_group_supported : _CG_STL_NAMESPACE::false_type {};
#ifdef _CG_HAS_INSTR_ELECT
template<>
struct _elect_group_supported<coalesced_group> : _CG_STL_NAMESPACE::true_type {};
template<unsigned int Size, typename Parent>
struct _elect_group_supported<thread_block_tile<Size, Parent>> :
_CG_STL_NAMESPACE::integral_constant<bool, (Size <= 32)> {};
#endif
template <typename Group>
struct elect_group_supported : public _elect_group_supported<details::remove_qual<Group>> {};
template<typename Group>
_CG_STATIC_QUALIFIER bool elect_one(const Group& group, unsigned int mask, unsigned int& leader_lane) {
int is_leader = 0;
#ifdef _CG_HAS_INSTR_ELECT
asm("{\n\t"
" .reg .pred p;\n\t"
" elect.sync %0|p, %2;\n\t"
" @p mov.s32 %1, 1;\n\t"
"}"
: "+r"(leader_lane), "+r"(is_leader) : "r" (mask));
#endif
return is_leader;
}
template<bool UseElect>
struct invoke_one_impl {};
template<>
struct invoke_one_impl<true> {
template<typename Group, typename Fn, typename... Args>
_CG_STATIC_QUALIFIER void invoke_one(const Group& group, Fn&& fn, Args&&... args) {
auto mask = details::_coalesced_group_data_access::get_mask(group);
unsigned int leader_lane = 0;
if (elect_one(group, mask, leader_lane)) {
_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...);
}
}
template<typename Group, typename Fn, typename... Args>
_CG_STATIC_QUALIFIER auto invoke_one_broadcast(const Group& group, Fn&& fn, Args&&... args)
-> typename _CG_STL_NAMESPACE::remove_reference<
decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...))>::type {
using ResultType = decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...));
details::remove_qual<ResultType> result;
auto mask = details::_coalesced_group_data_access::get_mask(group);
unsigned int leader_lane = 0;
if (elect_one(group, mask, leader_lane)) {
result = _CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...);
}
// Need to use low level api instead of group.shfl, because elect_one returns lane id, not group rank.
return tile::shuffle_dispatch<ResultType>::shfl(result, mask, leader_lane, 32);
}
};
template<>
struct invoke_one_impl<false> {
template<typename Group, typename Fn, typename... Args>
_CG_STATIC_QUALIFIER void invoke_one(const Group& group, Fn&& fn, Args&&... args) {
if (group.thread_rank() == 0) {
_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...);
}
}
template<typename Group, typename Fn, typename... Args>
_CG_STATIC_QUALIFIER auto invoke_one_broadcast(const Group& group, Fn&& fn, Args&&... args)
-> typename _CG_STL_NAMESPACE::remove_reference<
decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...))>::type {
using ResultType = decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...));
details::remove_qual<ResultType> result;
if (group.thread_rank() == 0) {
result = _CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...);
}
return group.shfl(result, 0);
}
};
}; // namespace details
template<typename Group, typename Fn, typename... Args>
_CG_QUALIFIER void invoke_one(const Group& group, Fn&& fn, Args&&... args) {
using impl = details::invoke_one_impl<details::elect_group_supported<Group>::value>;
impl::invoke_one(group, _CG_STL_NAMESPACE::forward<Fn>(fn), _CG_STL_NAMESPACE::forward<Args>(args)...);
}
template<typename Fn, typename... Args>
_CG_QUALIFIER auto invoke_one_broadcast(const coalesced_group& group, Fn&& fn, Args&&... args)
-> typename _CG_STL_NAMESPACE::remove_reference<
decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...))>::type {
using ResultType = decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...));
static_assert(!_CG_STL_NAMESPACE::is_same<ResultType, void>::value,
"For invocables returning void invoke_one should be used instead");
using impl = details::invoke_one_impl<details::elect_group_supported<coalesced_group>::value>;
return impl::invoke_one_broadcast(group,
_CG_STL_NAMESPACE::forward<Fn>(fn),
_CG_STL_NAMESPACE::forward<Args>(args)...);
}
template<unsigned int Size, typename Parent, typename Fn, typename... Args>
_CG_QUALIFIER auto invoke_one_broadcast(const thread_block_tile<Size, Parent>& group, Fn&& fn, Args&&... args)
-> typename _CG_STL_NAMESPACE::remove_reference<
decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...))>::type {
using ResultType = decltype(_CG_STL_NAMESPACE::forward<Fn>(fn)(_CG_STL_NAMESPACE::forward<Args>(args)...));
static_assert(!_CG_STL_NAMESPACE::is_same<ResultType, void>::value,
"For invocables returning void invoke_one should be used instead");
using impl = details::invoke_one_impl<details::elect_group_supported<thread_block_tile<Size, Parent>>::value>;
return impl::invoke_one_broadcast(group,
_CG_STL_NAMESPACE::forward<Fn>(fn),
_CG_STL_NAMESPACE::forward<Args>(args)...);
}
_CG_END_NAMESPACE
#endif //_CG_CPP11_FEATURES
#endif // _CG_INVOKE_H
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