Replacing C's memcpy with a D implementation

[Nick Sabalausky (Abscissa)]

On 06/10/2018 08:01 PM, Walter Bright wrote:
> On 6/10/2018 4:39 PM, David Nadlinger wrote:
>> That's not entirely true. Intel started optimising some of the REP 
>> string instructions again on Ivy Bridge and above. There is a CPUID 
>> bit to indicate that (ERMS?); I'm sure the Optimization Manual has 
>> further details. From what I remember, `rep movsb` is supposed to beat 
>> an AVX loop on most recent Intel µarchs if the destination is aligned 
>> and the data is longer than a few cache 
> 
> The drama of which instruction mix is faster on which CPU never abates!

In many ways, I really miss 80's machine architecture ;) So simple.