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This simple SSE code:
#include <vector>
#include <emmintrin.h>
int main() {
std::vector<__m128> blah;
blah.push_back(__m128());
}
Crashes on MSVC 10 with a segfault at 0xffffffff.
What could be going wrong ?
A
std::vectordoes not allocate specially aligned memory, which__m128needs to store it’s data. You will have to either swap out the allocator, or replace it with an array of 4 floats and then perform an unaligned load or copy out to an aligned location every time you access the vector.