Replacing C's memcpy with a D implementation

[Walter Bright]

On 6/11/2018 11:17 AM, Guillaume Piolat wrote:
> I don't know if someone really wrote this code, or if it was all from intrinsics.

memcpy is so critical to success it is likely written by Intel itself to ensure 
every drop of perf is wrung out of the CPU.

I was Intel CEO I'd direct the CPU hardware guys to do this and give it away.