mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-24 20:59:17 +08:00
101 lines
4.0 KiB
C++
101 lines
4.0 KiB
C++
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of NVIDIA CORPORATION nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
|
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef CUDASHAREDMEM_H
|
|
#define CUDASHAREDMEM_H
|
|
|
|
//****************************************************************************
|
|
// Because dynamically sized shared memory arrays are declared "extern",
|
|
// we can't templatize them directly. To get around this, we declare a
|
|
// simple wrapper struct that will declare the extern array with a different
|
|
// name depending on the type. This avoids compiler errors about duplicate
|
|
// definitions.
|
|
//
|
|
// To use dynamically allocated shared memory in a templatized __global__ or
|
|
// __device__ function, just replace code like this:
|
|
// template<class T>
|
|
// __global__ void
|
|
// foo( T* g_idata, T* g_odata)
|
|
// {
|
|
// // Shared mem size is determined by the host app at run time
|
|
// extern __shared__ T sdata[];
|
|
// ...
|
|
// x = sdata[i];
|
|
// sdata[i] = x;
|
|
// ...
|
|
// }
|
|
//
|
|
// With this:
|
|
// template<class T>
|
|
// __global__ void
|
|
// foo( T* g_idata, T* g_odata)
|
|
// {
|
|
// // Shared mem size is determined by the host app at run time
|
|
// SharedMemory<T> sdata;
|
|
// ...
|
|
// x = sdata[i];
|
|
// sdata[i] = x;
|
|
// ...
|
|
// }
|
|
//****************************************************************************
|
|
|
|
// This is the un-specialized struct. Note that we prevent instantiation of
|
|
// this struct by making it abstract (i.e. with pure virtual methods).
|
|
template <typename T>
|
|
struct SharedMemory {
|
|
// Ensure that we won't compile any un-specialized types
|
|
virtual __device__ T &operator*() = 0;
|
|
virtual __device__ T &operator[](int i) = 0;
|
|
};
|
|
|
|
#define BUILD_SHAREDMEMORY_TYPE(t, n) \
|
|
template <> \
|
|
struct SharedMemory<t> { \
|
|
__device__ t &operator*() { \
|
|
extern __shared__ t n[]; \
|
|
return *n; \
|
|
} \
|
|
__device__ t &operator[](int i) { \
|
|
extern __shared__ t n[]; \
|
|
return n[i]; \
|
|
} \
|
|
}
|
|
|
|
BUILD_SHAREDMEMORY_TYPE(int, s_int);
|
|
BUILD_SHAREDMEMORY_TYPE(unsigned int, s_uint);
|
|
BUILD_SHAREDMEMORY_TYPE(char, s_char);
|
|
BUILD_SHAREDMEMORY_TYPE(unsigned char, s_uchar);
|
|
BUILD_SHAREDMEMORY_TYPE(short, s_short);
|
|
BUILD_SHAREDMEMORY_TYPE(unsigned short, s_ushort);
|
|
BUILD_SHAREDMEMORY_TYPE(long, s_long);
|
|
BUILD_SHAREDMEMORY_TYPE(unsigned long, s_ulong);
|
|
BUILD_SHAREDMEMORY_TYPE(bool, s_bool);
|
|
BUILD_SHAREDMEMORY_TYPE(float, s_float);
|
|
BUILD_SHAREDMEMORY_TYPE(double, s_double);
|
|
|
|
#endif
|