Hello,
could you please tell me, is there any way to use constexpr arrays in device code ? According to “Cuda C programming guide 7.0” I have no problems with constexpr scalars, but arrays seem do not compile. Below some example:
template<unsigned D, unsigned Q>
class LatticeArrangement
{
} ;
template<>
class LatticeArrangement<3,19>
{
public:
static constexpr double c[19] = { 0,1,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16,17,18 } ;
static constexpr double d = 19.0 ;
__host__ __device__
static constexpr double getC( unsigned index )
{
// FIXME: error: identifier "LatticeArrangement<(unsigned int)3u, (unsigned int)19u> ::c" is undefined in device code
return c[ index ] ;
//return d * index ; // OK, this one works
} ;
} ;
constexpr double LatticeArrangement<3,19>::c[] ;
template< class LatticeArrangement >
class FluidModelIncompressible
{
public:
__host__ __device__
static double computeSomething(double v, unsigned idx)
{
return LatticeArrangement::getC( idx ) * v ;
}
} ;
// Does nothing useful, we want only to compile this
template< class FluidModel >
__global__ void
kernel1 ( double * data )
{
data[ threadIdx.x ] = FluidModel::computeSomething( threadIdx.y, threadIdx.z ) ;
}
int main( int argc, char ** argv )
{
dim3 numBlocks ( 2 ) ;
dim3 numThreads ( 4, 4, 4 ) ;
double * vptr = NULL ;
kernel1< FluidModelIncompressible< LatticeArrangement<3,19> > >
<<< numBlocks, numThreads >>> ( vptr ) ;
return 0 ;
}
Maybe there is some other way to avoid duplication of code between host and device ?
I am using
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2015 NVIDIA Corporation
Built on Mon_Feb_16_22:59:02_CST_2015
Cuda compilation tools, release 7.0, V7.0.27
Thanks in advance :)