3 ms·

Probably not a lot faster? And apart from what you're doing with this data, isn't this also going to depend a lot on the CPU? I can see that with 16 bytes, a lo

Probably not a lot faster? And apart from what you're doing with this data, isn't this also going to depend a lot on the CPU? I can see that with 16 bytes, a lot of accesses could be 2x aligned 8 bytes (or 1x16) instead of 3x4 bytes. Some other accesses, maybe not so much. And there is also the issue of increased cache pressure.

connicpu 3y ago
On the GPU especially, having the data aligned to 16 bytes is huge just due to the nature of what a GPU is optimized for and the way memory access is designed. The speedup on x86_64 isn't as huge, but the aligned load instructions for SSE/AVX registers are still quite a bit faster than the unaligned load instructions. It can really add up when you're processing thousands of vectors every frame. The cache lines will only go so far when a single 3D affine transformation matrix (floatx4x4) already takes up an entire cache line by itself.