FROL
January 27, 2008, 6:16pm
1
i know that C++ doens’t fully support on host yet, but i will report about strange compiler behaviour.
#ifndef __CUDACC__
#define __align__(N) __declspec(align(N))
#endif
#define SSE_ALIGN_BOUNDARY 16
#define SSE_ALIGNED __align__(SSE_ALIGN_BOUNDARY)
struct SSE_ALIGNED SSE_Aligned_Object {/*some code*/}
struct vec4f : public SSE_Aligned_Object {/*some code*/}
struct Sphere4f : public SSE_Aligned_Object
{
vec4f pos;
float r;
float rSquare;
}
now on msvc i have sizeof(Sphere4f ) == 32. that’s good.
but on nvcc i have sizeof(Sphere4f ) == 48. that’s bad
if i wrote
struct SSE_ALIGNED vec4f {/*some code*/}
on nvcc i have sizeof(Sphere4f ) == 32. that’s good.
but i want to use inheritance
wumpus
January 28, 2008, 9:30am
2
How can we say if you don’t give the class definition of SSE_ALIGNED_OBJECT?
FROL
January 28, 2008, 1:28pm
3
sorry, my guilt
struct SSE_ALIGNED SSE_Aligned_Object
{
#ifndef __CUDACC__
static void* operator new(size_t size)
{
void* ptr = _aligned_malloc(size,16);
if(!ptr)
throw std::bad_alloc("_aligned_malloc(): unsufficient memory");
return ptr;
}
static void operator delete(void* raw_memory)
{
if(!raw_memory) return;
_aligned_free(raw_memory);
}
static void* operator new[](size_t size)
{
void* ptr = _aligned_malloc(size,16);
if(!ptr)
throw std::bad_alloc("_aligned_malloc(): unsufficient memory");
return ptr;
}
static void operator delete[](void* raw_memory)
{
if(!raw_memory) return;
_aligned_free(raw_memory);
}
#endif
};
wumpus
January 28, 2008, 2:28pm
4
So, even when inheriting from an empty object you increase the size with 16 bytes? curious.
FROL
January 28, 2008, 3:41pm
5
yes. on msvc sizeof(Sphere4f ) == 32 in that case. And that is size what i want.