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/*
* Copyright 2008-2009 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <cuda.h>
#include <cusp/complex.h>
#include <cusp/exception.h>
#include <cusp/detail/device/utils.h>
#ifdef CUSP_USE_TEXTURE_MEMORY
// These textures are (optionally) used to cache the 'x' vector in y += A*x
texture<float,1> tex_x_float;
texture<int2,1> tex_x_double;
#endif
inline void bind_x(const float * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
size_t offset = size_t(-1);
CUDA_SAFE_CALL(cudaBindTexture(&offset, tex_x_float, x));
if (offset != 0)
throw cusp::invalid_input_exception("memory is not aligned, refusing to use texture cache");
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
// Use int2 to pull doubles through texture cache
inline void bind_x(const double * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
size_t offset = size_t(-1);
CUDA_SAFE_CALL(cudaBindTexture(&offset, tex_x_double, x));
if (offset != 0)
throw cusp::invalid_input_exception("memory is not aligned, refusing to use texture cache");
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
inline void bind_x(const cusp::complex<float> * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
size_t offset = size_t(-1);
CUDA_SAFE_CALL(cudaBindTexture(&offset, tex_x_float, x));
if (offset != 0)
throw cusp::invalid_input_exception("memory is not aligned, refusing to use texture cache");
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
// Use int2 to pull doubles through texture cache
inline void bind_x(const cusp::complex<double> * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
size_t offset = size_t(-1);
CUDA_SAFE_CALL(cudaBindTexture(&offset, tex_x_double, x));
if (offset != 0)
throw cusp::invalid_input_exception("memory is not aligned, refusing to use texture cache");
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
// Note: x is unused, but distinguishes the two unbind functions
inline void unbind_x(const float * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
CUDA_SAFE_CALL(cudaUnbindTexture(tex_x_float));
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
inline void unbind_x(const double * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
CUDA_SAFE_CALL(cudaUnbindTexture(tex_x_double));
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
inline void unbind_x(const cusp::complex<float> * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
CUDA_SAFE_CALL(cudaUnbindTexture(tex_x_float));
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
inline void unbind_x(const cusp::complex<double> * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
CUDA_SAFE_CALL(cudaUnbindTexture(tex_x_double));
#else
throw cusp::runtime_exception("texture support was not enabled");
#endif
}
template <bool UseCache>
__inline__ __device__ float fetch_x(const int& i, const float * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
if (UseCache)
return tex1Dfetch(tex_x_float, i);
else
#endif
return x[i];
}
template <bool UseCache>
__inline__ __device__ double fetch_x(const int& i, const double * x)
{
#if __CUDA_ARCH__ >= 130
#ifdef CUSP_USE_TEXTURE_MEMORY
// double requires Compute Capability 1.3 or greater
if (UseCache)
{
int2 v = tex1Dfetch(tex_x_double, i);
return __hiloint2double(v.y, v.x);
}
else
#endif // CUSP_USE_TEXTURE_MEMORY
return x[i];
#else
return 1.0f;
#endif
}
template <bool UseCache>
__inline__ __device__ cusp::complex<float> fetch_x(const int& i, const cusp::complex<float> * x)
{
#ifdef CUSP_USE_TEXTURE_MEMORY
if (UseCache)
return cusp::complex<float>(tex1Dfetch(tex_x_float, i*2),tex1Dfetch(tex_x_float, i*2+1));
else
#endif
return x[i];
}
template <bool UseCache>
__inline__ __device__ cusp::complex<double> fetch_x(const int& i, const cusp::complex<double> * x)
{
#if __CUDA_ARCH__ >= 130
#ifdef CUSP_USE_TEXTURE_MEMORY
// double requires Compute Capability 1.3 or greater
if (UseCache)
{
int2 vr = tex1Dfetch(tex_x_double, i*2);
int2 vi = tex1Dfetch(tex_x_double, i*2+1);
return cusp::complex<double<(__hiloint2double(vr.y, vr.x),__hiloint2double(vr.y, vr.x));
}
else
#endif // CUSP_USE_TEXTURE_MEMORY
return x[i];
#else
return 1.0f;
#endif
}
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