How to increase performance of memcpy

Question

Summary:

memcpy seems unable to transfer over 2GB/sec on my system in a real or test application. What can I do to get faster memory-to-memory copies?

Full d

Answer 1

I'm not sure if it's done in run time or if you have to do it compile time, but you should have SSE or similar extensions enabled as the vector unit often can write 128 bits to the memory compared to 64 bits for the CPU.

Try this implementation.

Yeah, and make sure that both the source and destination is aligned to 128 bits. If your source and destination are not aligned respective to each other your memcpy() will have to do some serious magic. :)