Replacing C's memcpy with a D implementation

[rikki cattermole]

On 11/06/2018 1:45 AM, Mike Franklin wrote:
> On Sunday, 10 June 2018 at 13:16:21 UTC, Adam D. Ruppe wrote:
> 
>> arr1[] = arr2[]; // the compiler makes this memcpy, the optimzer can 
>> further do its magic
> 
> void memcpyD()
> {
>      dst = src.dup;

malloc (for slice not static array)

> }
> 
> void memcpyD2()
> {
>      dst[] = src[];

memcpy

> }
> 
> -----
> memcpyD: 1 ms, 725 μs, and 1 hnsec
> memcpyD2: 587 μs and 5 hnsecs
> memcpyASM: 119 μs and 5 hnsecs
> 
> Still, the ASM version is much faster.
> 
> btw, what's the difference between the two.  If you can't tell, I'm 
> actually not a very good D programmer.
> 
> Mike
> 
> 
>