SSE and C++ containers

Question

Is there an obvious reason why the following code segfaults ?

#include 
#include 

struct point {
    __m128i v;

  point()          


        

Answer 1

SSE intrinsics are required to be 16-byte aligned in memory. When you allocate an __m128 on the stack, there's no problem because the compiler automatically aligns these correctly. The default allocator for std::vector<>, which handles dynamic memory allocation, does not produce aligned allocations.