Coming soon: [https://github.com/nim-lang/Nim/pull/11077](https://github.com/nim-lang/Nim/pull/11077)
For SSE, you can just use m128 type or GCC/LLVM vector extension ([https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html)](https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html\)), it will be properly aligned (tested up to AVX512).
