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optimized gpu::multiply

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This commit is contained in:
Vladislav Vinogradov
2011-09-12 08:45:56 +00:00
parent 6763bd6d01
commit acac27d8fe
2 changed files with 43 additions and 53 deletions
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77
modules/gpu/src/cuda/element_operations.cu
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@@ -607,68 +607,59 @@ namespace cv { namespace gpu { namespace device
//////////////////////////////////////////////////////////////////////////
// multiply
// TODO implement more efficient version
template <typename TSrc1, typename TSrc2, typename TDst, int cn>
void __global__ multiplyKernel(const PtrStep src1, const PtrStep src2, int rows, int cols,
PtrStep dst)
struct multiply_8uc4_32f : binary_function<uint, float, uint>
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
if (x < cols && y < rows)
__device__ __forceinline__ uint operator ()(uint a, float b) const
{
((TDst*)dst.ptr(y))[x] = saturate_cast<TDst>(((TSrc1*)src1.ptr(y))[x] * ((TSrc2*)src2.ptr(y))[x / cn]);
uint res = 0;
res |= 0xffu & (saturate_cast<uchar>((0xffu & (a )) * b) );
res |= 0xffu & (saturate_cast<uchar>((0xffu & (a >> 8)) * b) << 8);
res |= 0xffu & (saturate_cast<uchar>((0xffu & (a >> 16)) * b) << 16);
res |= 0xffu & (saturate_cast<uchar>((0xffu & (a >> 24)) * b) << 24);
return res;
}
}
};
template <typename TSrc1, typename TSrc2, typename TDst, int cn>
void multiplyCaller(const PtrStep src1, const PtrStep src2, int rows, int cols, PtrStep dst, cudaStream_t stream)
template <> struct TransformFunctorTraits<multiply_8uc4_32f> : DefaultTransformFunctorTraits<multiply_8uc4_32f>
{
dim3 threads(32, 8);
dim3 grid(divUp(cols, threads.x), divUp(rows, threads.y));
enum { smart_block_dim_x = 8 };
enum { smart_block_dim_y = 8 };
enum { smart_shift = 8 };
};
multiplyKernel<TSrc1, TSrc2, TDst, cn><<<grid, threads>>>(src1, src2, rows, cols, dst);
cudaSafeCall(cudaGetLastError());
if (stream == 0)
cudaSafeCall(cudaDeviceSynchronize());
void multiply_gpu(const DevMem2D_<uchar4>& src1, const DevMem2Df& src2, const DevMem2D_<uchar4>& dst, cudaStream_t stream)
{
transform(static_cast< DevMem2D_<uint> >(src1), src2, static_cast< DevMem2D_<uint> >(dst), multiply_8uc4_32f(), stream);
}
template void multiplyCaller<uchar, float, uchar, 4>(const PtrStep src1, const PtrStep src2, int rows, int cols, PtrStep dst, cudaStream_t stream);
//////////////////////////////////////////////////////////////////////////
// multiply (by scalar)
// TODO implement more efficient version
template <typename TSrc, typename TDst>
void __global__ multiplyScalarKernel(const PtrStep src1, float scale, int rows, int cols, PtrStep dst)
template <typename T, typename D, typename S> struct MultiplyScalar : unary_function<T, D>
{
int x = blockIdx.x * blockDim.x + threadIdx.x;
int y = blockIdx.y * blockDim.y + threadIdx.y;
__host__ __device__ __forceinline__ MultiplyScalar(typename TypeTraits<S>::ParameterType scale_) : scale(scale_) {}
if (x < cols && y < rows)
__device__ __forceinline__ D operator ()(typename TypeTraits<T>::ParameterType a) const
{
((TDst*)dst.ptr(y))[x] = saturate_cast<TDst>(((TSrc*)src1.ptr(y))[x] * scale);
return saturate_cast<D>(a * scale);
}
}
const S scale;
};
template <typename TSrc, typename TDst>
void multiplyScalarCaller(const PtrStep src, float scale, int rows, int cols, PtrStep dst, cudaStream_t stream)
template <> struct TransformFunctorTraits< MultiplyScalar<uchar, uchar, float> > : DefaultTransformFunctorTraits< MultiplyScalar<uchar, uchar, float> >
{
dim3 threads(32, 8);
dim3 grid(divUp(cols, threads.x), divUp(rows, threads.y));
enum { smart_block_dim_y = 8 };
enum { smart_shift = 8 };
};
multiplyScalarKernel<TSrc, TDst><<<grid, threads>>>(src, scale, rows, cols, dst);
cudaSafeCall(cudaGetLastError());
if (stream == 0)
cudaSafeCall(cudaDeviceSynchronize());
template <typename T, typename D>
void multiplyScalar_gpu(const DevMem2D& src, float scale, const DevMem2D& dst, cudaStream_t stream)
{
transform(static_cast< DevMem2D_<T> >(src), static_cast< DevMem2D_<D> >(dst), MultiplyScalar<T, D, float>(scale), stream);
}
template void multiplyScalarCaller<uchar, uchar>(const PtrStep src, float scale, int rows, int cols, PtrStep dst, cudaStream_t stream);
template void multiplyScalar_gpu<uchar, uchar>(const DevMem2D& src, float scale, const DevMem2D& dst, cudaStream_t stream);
}}}