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/**
* \file
* The cub::BlockDiscontinuity class provides [<em>collective</em>](index.html#sec0) methods for flagging discontinuities within an ordered set of items partitioned across a CUDA thread block.
*/
#pragma once
#include "../util_type.cuh"
#include "../util_ptx.cuh"
#include "../util_namespace.cuh"
/// Optional outer namespace(s)
CUB_NS_PREFIX
/// CUB namespace
namespace cub {
/**
* \brief The BlockDiscontinuity class provides [<em>collective</em>](index.html#sec0) methods for flagging discontinuities within an ordered set of items partitioned across a CUDA thread block. 
* \ingroup BlockModule
*
* \tparam T The data type to be flagged.
* \tparam BLOCK_DIM_X The thread block length in threads along the X dimension
* \tparam BLOCK_DIM_Y <b>[optional]</b> The thread block length in threads along the Y dimension (default: 1)
* \tparam BLOCK_DIM_Z <b>[optional]</b> The thread block length in threads along the Z dimension (default: 1)
* \tparam PTX_ARCH <b>[optional]</b> \ptxversion
*
* \par Overview
* - A set of "head flags" (or "tail flags") is often used to indicate corresponding items
* that differ from their predecessors (or successors). For example, head flags are convenient
* for demarcating disjoint data segments as part of a segmented scan or reduction.
* - \blocked
*
* \par Performance Considerations
* - \granularity
*
* \par A Simple Example
* \blockcollective{BlockDiscontinuity}
* \par
* The code snippet below illustrates the head flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Collectively compute head flags for discontinuities in the segment
* int head_flags[4];
* BlockDiscontinuity(temp_storage).FlagHeads(head_flags, thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], [3,4,4,4], ... }</tt>.
* The corresponding output \p head_flags in those threads will be
* <tt>{ [1,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
*
* \par Performance Considerations
* - Incurs zero bank conflicts for most types
*
*/
template <
typename T,
int BLOCK_DIM_X,
int BLOCK_DIM_Y = 1,
int BLOCK_DIM_Z = 1,
int PTX_ARCH = CUB_PTX_ARCH>
class BlockDiscontinuity
{
private:
/******************************************************************************
* Constants and type definitions
******************************************************************************/
/// Constants
enum
{
/// The thread block size in threads
BLOCK_THREADS = BLOCK_DIM_X * BLOCK_DIM_Y * BLOCK_DIM_Z,
};
/// Shared memory storage layout type (last element from each thread's input)
struct _TempStorage
{
T first_items[BLOCK_THREADS];
T last_items[BLOCK_THREADS];
};
/******************************************************************************
* Utility methods
******************************************************************************/
xgboost/cub/cub/block/block_discontinuity.cuh view on Meta::CPAN
preds[0] = temp_storage.last_items[linear_tid - 1];
head_flags[0] = ApplyOp<FlagOp>::FlagT(flag_op, preds[0], input[0], linear_tid * ITEMS_PER_THREAD);
}
// Set head_flags for remaining items
Iterate<1, ITEMS_PER_THREAD>::FlagHeads(linear_tid, head_flags, input, preds, flag_op);
}
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeads(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
T (&preds)[ITEMS_PER_THREAD], ///< [out] Calling thread's predecessor items
FlagOp flag_op, ///< [in] Binary boolean flag predicate
T tile_predecessor_item) ///< [in] <b>[<em>thread</em><sub>0</sub> only]</b> Item with which to compare the first tile item (<tt>input<sub>0</sub></tt> from <em>thread</em><sub>0</sub>).
{
// Share last item
temp_storage.last_items[linear_tid] = input[ITEMS_PER_THREAD - 1];
CTA_SYNC();
// Set flag for first thread-item
preds[0] = (linear_tid == 0) ?
tile_predecessor_item : // First thread
temp_storage.last_items[linear_tid - 1];
head_flags[0] = ApplyOp<FlagOp>::FlagT(flag_op, preds[0], input[0], linear_tid * ITEMS_PER_THREAD);
// Set head_flags for remaining items
Iterate<1, ITEMS_PER_THREAD>::FlagHeads(linear_tid, head_flags, input, preds, flag_op);
}
#endif // DOXYGEN_SHOULD_SKIP_THIS
/**
* \brief Sets head flags indicating discontinuities between items partitioned across the thread block, for which the first item has no reference and is always flagged.
*
* \par
* - The flag <tt>head_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(</tt><em>previous-item</em><tt>, input<sub><em>i</em></sub>)</tt>
* returns \p true (where <em>previous-item</em> is either the preceding item
* in the same thread or the last item in the previous thread).
* - For <em>thread</em><sub>0</sub>, item <tt>input<sub>0</sub></tt> is always flagged.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the head-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Collectively compute head flags for discontinuities in the segment
* int head_flags[4];
* BlockDiscontinuity(temp_storage).FlagHeads(head_flags, thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], [3,4,4,4], ... }</tt>.
* The corresponding output \p head_flags in those threads will be
* <tt>{ [1,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeads(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op) ///< [in] Binary boolean flag predicate
{
T preds[ITEMS_PER_THREAD];
FlagHeads(head_flags, input, preds, flag_op);
}
/**
* \brief Sets head flags indicating discontinuities between items partitioned across the thread block.
*
* \par
* - The flag <tt>head_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(</tt><em>previous-item</em><tt>, input<sub><em>i</em></sub>)</tt>
* returns \p true (where <em>previous-item</em> is either the preceding item
* in the same thread or the last item in the previous thread).
* - For <em>thread</em><sub>0</sub>, item <tt>input<sub>0</sub></tt> is compared
* against \p tile_predecessor_item.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the head-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Have thread0 obtain the predecessor item for the entire tile
* int tile_predecessor_item;
* if (threadIdx.x == 0) tile_predecessor_item == ...
*
* // Collectively compute head flags for discontinuities in the segment
* int head_flags[4];
* BlockDiscontinuity(temp_storage).FlagHeads(
* head_flags, thread_data, cub::Inequality(), tile_predecessor_item);
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], [3,4,4,4], ... }</tt>,
* and that \p tile_predecessor_item is \p 0. The corresponding output \p head_flags in those threads will be
* <tt>{ [0,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeads(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op, ///< [in] Binary boolean flag predicate
T tile_predecessor_item) ///< [in] <b>[<em>thread</em><sub>0</sub> only]</b> Item with which to compare the first tile item (<tt>input<sub>0</sub></tt> from <em>thread</em><sub>0</sub>).
{
T preds[ITEMS_PER_THREAD];
FlagHeads(head_flags, input, preds, flag_op, tile_predecessor_item);
}
//@} end member group
/******************************************************************//**
* \name Tail flag operations
*********************************************************************/
//@{
/**
* \brief Sets tail flags indicating discontinuities between items partitioned across the thread block, for which the last item has no reference and is always flagged.
*
* \par
* - The flag <tt>tail_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(input<sub><em>i</em></sub>, </tt><em>next-item</em><tt>)</tt>
* returns \p true (where <em>next-item</em> is either the next item
* in the same thread or the first item in the next thread).
* - For <em>thread</em><sub><em>BLOCK_THREADS</em>-1</sub>, item
* <tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> is always flagged.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the tail-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Collectively compute tail flags for discontinuities in the segment
* int tail_flags[4];
* BlockDiscontinuity(temp_storage).FlagTails(tail_flags, thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], ..., [124,125,125,125] }</tt>.
* The corresponding output \p tail_flags in those threads will be
* <tt>{ [0,1,0,0], [0,0,0,1], [1,0,0,...], ..., [1,0,0,1] }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagTails(
FlagT (&tail_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity tail_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op) ///< [in] Binary boolean flag predicate
{
// Share first item
temp_storage.first_items[linear_tid] = input[0];
CTA_SYNC();
// Set flag for last thread-item
tail_flags[ITEMS_PER_THREAD - 1] = (linear_tid == BLOCK_THREADS - 1) ?
1 : // Last thread
ApplyOp<FlagOp>::FlagT(
flag_op,
input[ITEMS_PER_THREAD - 1],
temp_storage.first_items[linear_tid + 1],
(linear_tid * ITEMS_PER_THREAD) + ITEMS_PER_THREAD);
// Set tail_flags for remaining items
Iterate<0, ITEMS_PER_THREAD - 1>::FlagTails(linear_tid, tail_flags, input, flag_op);
}
/**
* \brief Sets tail flags indicating discontinuities between items partitioned across the thread block.
*
* \par
* - The flag <tt>tail_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(input<sub><em>i</em></sub>, </tt><em>next-item</em><tt>)</tt>
* returns \p true (where <em>next-item</em> is either the next item
* in the same thread or the first item in the next thread).
* - For <em>thread</em><sub><em>BLOCK_THREADS</em>-1</sub>, item
* <tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> is compared
* against \p tile_successor_item.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the tail-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Have thread127 obtain the successor item for the entire tile
* int tile_successor_item;
* if (threadIdx.x == 127) tile_successor_item == ...
*
* // Collectively compute tail flags for discontinuities in the segment
* int tail_flags[4];
* BlockDiscontinuity(temp_storage).FlagTails(
* tail_flags, thread_data, cub::Inequality(), tile_successor_item);
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], ..., [124,125,125,125] }</tt>
* and that \p tile_successor_item is \p 125. The corresponding output \p tail_flags in those threads will be
* <tt>{ [0,1,0,0], [0,0,0,1], [1,0,0,...], ..., [1,0,0,0] }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagTails(
FlagT (&tail_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity tail_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op, ///< [in] Binary boolean flag predicate
T tile_successor_item) ///< [in] <b>[<em>thread</em><sub><tt>BLOCK_THREADS</tt>-1</sub> only]</b> Item with which to compare the last tile item (<tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> from <em>thread...
{
// Share first item
temp_storage.first_items[linear_tid] = input[0];
CTA_SYNC();
// Set flag for last thread-item
T successor_item = (linear_tid == BLOCK_THREADS - 1) ?
tile_successor_item : // Last thread
temp_storage.first_items[linear_tid + 1];
tail_flags[ITEMS_PER_THREAD - 1] = ApplyOp<FlagOp>::FlagT(
flag_op,
input[ITEMS_PER_THREAD - 1],
successor_item,
(linear_tid * ITEMS_PER_THREAD) + ITEMS_PER_THREAD);
// Set tail_flags for remaining items
Iterate<0, ITEMS_PER_THREAD - 1>::FlagTails(linear_tid, tail_flags, input, flag_op);
}
//@} end member group
/******************************************************************//**
* \name Head & tail flag operations
*********************************************************************/
//@{
/**
* \brief Sets both head and tail flags indicating discontinuities between items partitioned across the thread block.
*
* \par
* - The flag <tt>head_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(</tt><em>previous-item</em><tt>, input<sub><em>i</em></sub>)</tt>
* returns \p true (where <em>previous-item</em> is either the preceding item
* in the same thread or the last item in the previous thread).
* - For <em>thread</em><sub>0</sub>, item <tt>input<sub>0</sub></tt> is always flagged.
* - The flag <tt>tail_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(input<sub><em>i</em></sub>, </tt><em>next-item</em><tt>)</tt>
* returns \p true (where <em>next-item</em> is either the next item
* in the same thread or the first item in the next thread).
* - For <em>thread</em><sub><em>BLOCK_THREADS</em>-1</sub>, item
* <tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> is always flagged.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the head- and tail-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Collectively compute head and flags for discontinuities in the segment
* int head_flags[4];
* int tail_flags[4];
* BlockDiscontinuity(temp_storage).FlagTails(
* head_flags, tail_flags, thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], ..., [124,125,125,125] }</tt>
* and that the tile_successor_item is \p 125. The corresponding output \p head_flags
* in those threads will be <tt>{ [1,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
* and the corresponding output \p tail_flags in those threads will be
* <tt>{ [0,1,0,0], [0,0,0,1], [1,0,0,...], ..., [1,0,0,1] }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeadsAndTails(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
FlagT (&tail_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity tail_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op) ///< [in] Binary boolean flag predicate
{
// Share first and last items
temp_storage.first_items[linear_tid] = input[0];
temp_storage.last_items[linear_tid] = input[ITEMS_PER_THREAD - 1];
CTA_SYNC();
T preds[ITEMS_PER_THREAD];
// Set flag for first thread-item
preds[0] = temp_storage.last_items[linear_tid - 1];
if (linear_tid == 0)
{
head_flags[0] = 1;
}
else
{
head_flags[0] = ApplyOp<FlagOp>::FlagT(
flag_op,
preds[0],
input[0],
linear_tid * ITEMS_PER_THREAD);
}
// Set flag for last thread-item
tail_flags[ITEMS_PER_THREAD - 1] = (linear_tid == BLOCK_THREADS - 1) ?
1 : // Last thread
ApplyOp<FlagOp>::FlagT(
flag_op,
input[ITEMS_PER_THREAD - 1],
temp_storage.first_items[linear_tid + 1],
(linear_tid * ITEMS_PER_THREAD) + ITEMS_PER_THREAD);
// Set head_flags for remaining items
Iterate<1, ITEMS_PER_THREAD>::FlagHeads(linear_tid, head_flags, input, preds, flag_op);
// Set tail_flags for remaining items
Iterate<0, ITEMS_PER_THREAD - 1>::FlagTails(linear_tid, tail_flags, input, flag_op);
}
/**
* \brief Sets both head and tail flags indicating discontinuities between items partitioned across the thread block.
*
* \par
* - The flag <tt>head_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(</tt><em>previous-item</em><tt>, input<sub><em>i</em></sub>)</tt>
* returns \p true (where <em>previous-item</em> is either the preceding item
* in the same thread or the last item in the previous thread).
* - For <em>thread</em><sub>0</sub>, item <tt>input<sub>0</sub></tt> is always flagged.
* - The flag <tt>tail_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(input<sub><em>i</em></sub>, </tt><em>next-item</em><tt>)</tt>
* returns \p true (where <em>next-item</em> is either the next item
* in the same thread or the first item in the next thread).
* - For <em>thread</em><sub><em>BLOCK_THREADS</em>-1</sub>, item
* <tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> is compared
* against \p tile_predecessor_item.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the head- and tail-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Have thread127 obtain the successor item for the entire tile
* int tile_successor_item;
* if (threadIdx.x == 127) tile_successor_item == ...
*
* // Collectively compute head and flags for discontinuities in the segment
* int head_flags[4];
* int tail_flags[4];
* BlockDiscontinuity(temp_storage).FlagTails(
* head_flags, tail_flags, tile_successor_item, thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], ..., [124,125,125,125] }</tt>
* and that the tile_successor_item is \p 125. The corresponding output \p head_flags
* in those threads will be <tt>{ [1,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
* and the corresponding output \p tail_flags in those threads will be
* <tt>{ [0,1,0,0], [0,0,0,1], [1,0,0,...], ..., [1,0,0,0] }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeadsAndTails(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
FlagT (&tail_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity tail_flags
T tile_successor_item, ///< [in] <b>[<em>thread</em><sub><tt>BLOCK_THREADS</tt>-1</sub> only]</b> Item with which to compare the last tile item (<tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> from <em>thread...
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op) ///< [in] Binary boolean flag predicate
{
// Share first and last items
temp_storage.first_items[linear_tid] = input[0];
temp_storage.last_items[linear_tid] = input[ITEMS_PER_THREAD - 1];
CTA_SYNC();
T preds[ITEMS_PER_THREAD];
// Set flag for first thread-item
if (linear_tid == 0)
{
head_flags[0] = 1;
}
else
{
preds[0] = temp_storage.last_items[linear_tid - 1];
head_flags[0] = ApplyOp<FlagOp>::FlagT(
flag_op,
preds[0],
input[0],
linear_tid * ITEMS_PER_THREAD);
}
// Set flag for last thread-item
T successor_item = (linear_tid == BLOCK_THREADS - 1) ?
tile_successor_item : // Last thread
temp_storage.first_items[linear_tid + 1];
tail_flags[ITEMS_PER_THREAD - 1] = ApplyOp<FlagOp>::FlagT(
flag_op,
input[ITEMS_PER_THREAD - 1],
successor_item,
(linear_tid * ITEMS_PER_THREAD) + ITEMS_PER_THREAD);
// Set head_flags for remaining items
Iterate<1, ITEMS_PER_THREAD>::FlagHeads(linear_tid, head_flags, input, preds, flag_op);
// Set tail_flags for remaining items
Iterate<0, ITEMS_PER_THREAD - 1>::FlagTails(linear_tid, tail_flags, input, flag_op);
}
/**
* \brief Sets both head and tail flags indicating discontinuities between items partitioned across the thread block.
*
* \par
* - The flag <tt>head_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(</tt><em>previous-item</em><tt>, input<sub><em>i</em></sub>)</tt>
* returns \p true (where <em>previous-item</em> is either the preceding item
* in the same thread or the last item in the previous thread).
* - For <em>thread</em><sub>0</sub>, item <tt>input<sub>0</sub></tt> is compared
* against \p tile_predecessor_item.
* - The flag <tt>tail_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(input<sub><em>i</em></sub>, </tt><em>next-item</em><tt>)</tt>
* returns \p true (where <em>next-item</em> is either the next item
* in the same thread or the first item in the next thread).
* - For <em>thread</em><sub><em>BLOCK_THREADS</em>-1</sub>, item
* <tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> is always flagged.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the head- and tail-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Have thread0 obtain the predecessor item for the entire tile
* int tile_predecessor_item;
* if (threadIdx.x == 0) tile_predecessor_item == ...
*
* // Have thread127 obtain the successor item for the entire tile
* int tile_successor_item;
* if (threadIdx.x == 127) tile_successor_item == ...
*
* // Collectively compute head and flags for discontinuities in the segment
* int head_flags[4];
* int tail_flags[4];
* BlockDiscontinuity(temp_storage).FlagTails(
* head_flags, tile_predecessor_item, tail_flags, tile_successor_item,
* thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], ..., [124,125,125,125] }</tt>,
* that the \p tile_predecessor_item is \p 0, and that the
* \p tile_successor_item is \p 125. The corresponding output \p head_flags
* in those threads will be <tt>{ [0,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
* and the corresponding output \p tail_flags in those threads will be
* <tt>{ [0,1,0,0], [0,0,0,1], [1,0,0,...], ..., [1,0,0,1] }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeadsAndTails(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
T tile_predecessor_item, ///< [in] <b>[<em>thread</em><sub>0</sub> only]</b> Item with which to compare the first tile item (<tt>input<sub>0</sub></tt> from <em>thread</em><sub>0</sub>).
FlagT (&tail_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity tail_flags
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op) ///< [in] Binary boolean flag predicate
{
// Share first and last items
temp_storage.first_items[linear_tid] = input[0];
temp_storage.last_items[linear_tid] = input[ITEMS_PER_THREAD - 1];
CTA_SYNC();
T preds[ITEMS_PER_THREAD];
// Set flag for first thread-item
preds[0] = (linear_tid == 0) ?
tile_predecessor_item : // First thread
temp_storage.last_items[linear_tid - 1];
head_flags[0] = ApplyOp<FlagOp>::FlagT(
flag_op,
preds[0],
input[0],
linear_tid * ITEMS_PER_THREAD);
// Set flag for last thread-item
tail_flags[ITEMS_PER_THREAD - 1] = (linear_tid == BLOCK_THREADS - 1) ?
1 : // Last thread
ApplyOp<FlagOp>::FlagT(
flag_op,
input[ITEMS_PER_THREAD - 1],
temp_storage.first_items[linear_tid + 1],
(linear_tid * ITEMS_PER_THREAD) + ITEMS_PER_THREAD);
// Set head_flags for remaining items
Iterate<1, ITEMS_PER_THREAD>::FlagHeads(linear_tid, head_flags, input, preds, flag_op);
// Set tail_flags for remaining items
Iterate<0, ITEMS_PER_THREAD - 1>::FlagTails(linear_tid, tail_flags, input, flag_op);
}
/**
* \brief Sets both head and tail flags indicating discontinuities between items partitioned across the thread block.
*
* \par
* - The flag <tt>head_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(</tt><em>previous-item</em><tt>, input<sub><em>i</em></sub>)</tt>
* returns \p true (where <em>previous-item</em> is either the preceding item
* in the same thread or the last item in the previous thread).
* - For <em>thread</em><sub>0</sub>, item <tt>input<sub>0</sub></tt> is compared
* against \p tile_predecessor_item.
* - The flag <tt>tail_flags<sub><em>i</em></sub></tt> is set for item
* <tt>input<sub><em>i</em></sub></tt> when
* <tt>flag_op(input<sub><em>i</em></sub>, </tt><em>next-item</em><tt>)</tt>
* returns \p true (where <em>next-item</em> is either the next item
* in the same thread or the first item in the next thread).
* - For <em>thread</em><sub><em>BLOCK_THREADS</em>-1</sub>, item
* <tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> is compared
* against \p tile_successor_item.
* - \blocked
* - \granularity
* - \smemreuse
*
* \par Snippet
* The code snippet below illustrates the head- and tail-flagging of 512 integer items that
* are partitioned in a [<em>blocked arrangement</em>](index.html#sec5sec3) across 128 threads
* where each thread owns 4 consecutive items.
* \par
* \code
* #include <cub/cub.cuh> // or equivalently <cub/block/block_discontinuity.cuh>
*
* __global__ void ExampleKernel(...)
* {
* // Specialize BlockDiscontinuity for a 1D block of 128 threads on type int
* typedef cub::BlockDiscontinuity<int, 128> BlockDiscontinuity;
*
* // Allocate shared memory for BlockDiscontinuity
* __shared__ typename BlockDiscontinuity::TempStorage temp_storage;
*
* // Obtain a segment of consecutive items that are blocked across threads
* int thread_data[4];
* ...
*
* // Have thread0 obtain the predecessor item for the entire tile
* int tile_predecessor_item;
* if (threadIdx.x == 0) tile_predecessor_item == ...
*
* // Have thread127 obtain the successor item for the entire tile
* int tile_successor_item;
* if (threadIdx.x == 127) tile_successor_item == ...
*
* // Collectively compute head and flags for discontinuities in the segment
* int head_flags[4];
* int tail_flags[4];
* BlockDiscontinuity(temp_storage).FlagTails(
* head_flags, tile_predecessor_item, tail_flags, tile_successor_item,
* thread_data, cub::Inequality());
*
* \endcode
* \par
* Suppose the set of input \p thread_data across the block of threads is
* <tt>{ [0,0,1,1], [1,1,1,1], [2,3,3,3], ..., [124,125,125,125] }</tt>,
* that the \p tile_predecessor_item is \p 0, and that the
* \p tile_successor_item is \p 125. The corresponding output \p head_flags
* in those threads will be <tt>{ [0,0,1,0], [0,0,0,0], [1,1,0,0], [0,1,0,0], ... }</tt>.
* and the corresponding output \p tail_flags in those threads will be
* <tt>{ [0,1,0,0], [0,0,0,1], [1,0,0,...], ..., [1,0,0,0] }</tt>.
*
* \tparam ITEMS_PER_THREAD <b>[inferred]</b> The number of consecutive items partitioned onto each thread.
* \tparam FlagT <b>[inferred]</b> The flag type (must be an integer type)
* \tparam FlagOp <b>[inferred]</b> Binary predicate functor type having member <tt>T operator()(const T &a, const T &b)</tt> or member <tt>T operator()(const T &a, const T &b, unsigned int b_index)</tt>, and returning \p true if a ...
*/
template <
int ITEMS_PER_THREAD,
typename FlagT,
typename FlagOp>
__device__ __forceinline__ void FlagHeadsAndTails(
FlagT (&head_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity head_flags
T tile_predecessor_item, ///< [in] <b>[<em>thread</em><sub>0</sub> only]</b> Item with which to compare the first tile item (<tt>input<sub>0</sub></tt> from <em>thread</em><sub>0</sub>).
FlagT (&tail_flags)[ITEMS_PER_THREAD], ///< [out] Calling thread's discontinuity tail_flags
T tile_successor_item, ///< [in] <b>[<em>thread</em><sub><tt>BLOCK_THREADS</tt>-1</sub> only]</b> Item with which to compare the last tile item (<tt>input</tt><sub><em>ITEMS_PER_THREAD</em>-1</sub> from <em>thread...
T (&input)[ITEMS_PER_THREAD], ///< [in] Calling thread's input items
FlagOp flag_op) ///< [in] Binary boolean flag predicate
{
// Share first and last items
temp_storage.first_items[linear_tid] = input[0];
temp_storage.last_items[linear_tid] = input[ITEMS_PER_THREAD - 1];
CTA_SYNC();
T preds[ITEMS_PER_THREAD];
( run in 0.443 second using v1.01-cache-2.11-cpan-39bf76dae61 )