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project_6/cccl_upstream/thrust/thrust/detail/replace.inl
EngineX CI 56fd68e7dd [INFRA] Import NVIDIA/CCCL upstream as optimization reference library 
CCCL (CUDA C++ Core Libraries) provides:
- CUB: device/block/warp-level GPU primitives (reduce, scan, sort, topk)
- Thrust: high-level parallel algorithms (transform_reduce, sort, scan)
- libcudacxx: CUDA C++ standard library (atomics, barriers, memory)
- cudax: experimental features (memory resources, allocators)
- Tuning policies: per-SM hardware-specific algorithm parameters

Competition optimization vectors mapped to CCCL:
- Output TPS (83% weight): warp_reduce, block_reduce, device_topk
- Input TPS (14% weight): device_scan, block_load, prefetch
- Cache TPS (3% weight): prefix caching strategy patterns
- Memory (0.9 util): pooled/cached/buddy allocators

Source: https://github.com/NVIDIA/cccl (shallow clone, HEAD only)
License: Apache-2.0
2026-07-30 09:35:51 +00:00

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// SPDX-FileCopyrightText: Copyright (c) 2008-2013, NVIDIA Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include <thrust/detail/config.h>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <thrust/iterator/iterator_traits.h>
#include <thrust/replace.h>
#include <thrust/system/detail/generic/select_system.h>
// Include all active backend system implementations (generic, sequential, host and device)
#include <thrust/system/detail/generic/replace.h>
#include <thrust/system/detail/sequential/replace.h>
#include __THRUST_HOST_SYSTEM_ALGORITH_DETAIL_HEADER_INCLUDE(replace.h)
#include __THRUST_DEVICE_SYSTEM_ALGORITH_DETAIL_HEADER_INCLUDE(replace.h)
// Some build systems need a hint to know which files we could include
#if 0
# include <thrust/system/cpp/detail/replace.h>
# include <thrust/system/cuda/detail/replace.h>
# include <thrust/system/omp/detail/replace.h>
# include <thrust/system/tbb/detail/replace.h>
#endif
THRUST_NAMESPACE_BEGIN
_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename ForwardIterator, typename T>
_CCCL_HOST_DEVICE void
replace(const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
ForwardIterator first,
ForwardIterator last,
const T& old_value,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace");
using thrust::system::detail::generic::replace;
return replace(thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, old_value, new_value);
} // end replace()
_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename ForwardIterator, typename Predicate, typename T>
_CCCL_HOST_DEVICE void replace_if(
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
ForwardIterator first,
ForwardIterator last,
Predicate pred,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_if");
using thrust::system::detail::generic::replace_if;
return replace_if(thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, pred, new_value);
} // end replace_if()
_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename ForwardIterator, typename InputIterator, typename Predicate, typename T>
_CCCL_HOST_DEVICE void replace_if(
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
ForwardIterator first,
ForwardIterator last,
InputIterator stencil,
Predicate pred,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_if");
using thrust::system::detail::generic::replace_if;
return replace_if(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, stencil, pred, new_value);
} // end replace_if()
_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename T>
_CCCL_HOST_DEVICE OutputIterator replace_copy(
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
InputIterator first,
InputIterator last,
OutputIterator result,
const T& old_value,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_copy");
using thrust::system::detail::generic::replace_copy;
return replace_copy(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, result, old_value, new_value);
} // end replace_copy()
_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename Predicate, typename T>
_CCCL_HOST_DEVICE OutputIterator replace_copy_if(
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
InputIterator first,
InputIterator last,
OutputIterator result,
Predicate pred,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_copy_if");
using thrust::system::detail::generic::replace_copy_if;
return replace_copy_if(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, result, pred, new_value);
} // end replace_copy_if()
_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy,
typename InputIterator1,
typename InputIterator2,
typename OutputIterator,
typename Predicate,
typename T>
_CCCL_HOST_DEVICE OutputIterator replace_copy_if(
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
InputIterator1 first,
InputIterator1 last,
InputIterator2 stencil,
OutputIterator result,
Predicate pred,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_copy_if");
using thrust::system::detail::generic::replace_copy_if;
return replace_copy_if(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, stencil, result, pred, new_value);
} // end replace_copy_if()
template <typename InputIterator, typename OutputIterator, typename Predicate, typename T>
OutputIterator
replace_copy_if(InputIterator first, InputIterator last, OutputIterator result, Predicate pred, const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_copy_if");
using thrust::system::detail::generic::select_system;
using System1 = typename thrust::iterator_system<InputIterator>::type;
using System2 = typename thrust::iterator_system<OutputIterator>::type;
System1 system1;
System2 system2;
return thrust::replace_copy_if(select_system(system1, system2), first, last, result, pred, new_value);
} // end replace_copy_if()
template <typename InputIterator1, typename InputIterator2, typename OutputIterator, typename Predicate, typename T>
OutputIterator replace_copy_if(
InputIterator1 first,
InputIterator1 last,
InputIterator2 stencil,
OutputIterator result,
Predicate pred,
const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_copy_if");
using thrust::system::detail::generic::select_system;
using System1 = typename thrust::iterator_system<InputIterator1>::type;
using System2 = typename thrust::iterator_system<InputIterator2>::type;
using System3 = typename thrust::iterator_system<OutputIterator>::type;
System1 system1;
System2 system2;
System3 system3;
return thrust::replace_copy_if(
select_system(system1, system2, system3), first, last, stencil, result, pred, new_value);
} // end replace_copy_if()
template <typename InputIterator, typename OutputIterator, typename T>
OutputIterator
replace_copy(InputIterator first, InputIterator last, OutputIterator result, const T& old_value, const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_copy");
using thrust::system::detail::generic::select_system;
using System1 = typename thrust::iterator_system<InputIterator>::type;
using System2 = typename thrust::iterator_system<OutputIterator>::type;
System1 system1;
System2 system2;
return thrust::replace_copy(select_system(system1, system2), first, last, result, old_value, new_value);
} // end replace_copy()
template <typename ForwardIterator, typename Predicate, typename T>
void replace_if(ForwardIterator first, ForwardIterator last, Predicate pred, const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_if");
using thrust::system::detail::generic::select_system;
using System = typename thrust::iterator_system<ForwardIterator>::type;
System system;
return thrust::replace_if(select_system(system), first, last, pred, new_value);
} // end replace_if()
template <typename ForwardIterator, typename InputIterator, typename Predicate, typename T>
void replace_if(ForwardIterator first, ForwardIterator last, InputIterator stencil, Predicate pred, const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace_if");
using thrust::system::detail::generic::select_system;
using System1 = typename thrust::iterator_system<ForwardIterator>::type;
using System2 = typename thrust::iterator_system<InputIterator>::type;
System1 system1;
System2 system2;
return thrust::replace_if(select_system(system1, system2), first, last, stencil, pred, new_value);
} // end replace_if()
template <typename ForwardIterator, typename T>
void replace(ForwardIterator first, ForwardIterator last, const T& old_value, const T& new_value)
{
_CCCL_NVTX_RANGE_SCOPE("thrust::replace");
using thrust::system::detail::generic::select_system;
using System = typename thrust::iterator_system<ForwardIterator>::type;
System system;
return thrust::replace(select_system(system), first, last, old_value, new_value);
} // end replace()
THRUST_NAMESPACE_END
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