Replacing C's memcpy with a D implementation

[Guillaume Piolat]

On Sunday, 10 June 2018 at 12:49:31 UTC, Mike Franklin wrote:
> I'm not experienced with this kind of programming, so I'm 
> doubting these results.  Have I done something wrong?  Am I 
> overlooking something?


Hi,

I've spent a lot of time optimizing memcpy. One of the result was 
that on Intel ICC the compiler intrinsics were unbeatable.
Please make one that guarantee the usage of the corresponding 
backend intrinsic, for example on LLVM.

The reasoning is that small areas of memory (statically known) 
will be elided to a few byte moves (inlined), whereas the larger 
one will call the highly optimized C stdlib calls.
If you use ASM instead of IR the optimization barriers and 
register spilling will make you probably less efficient.