D for the Win

[Mike via Digitalmars-d-announce]

On Sunday, 24 August 2014 at 14:04:22 UTC, ketmar via 
Digitalmars-d-announce wrote:
> On Sun, 24 Aug 2014 13:44:07 +0000
> Mike via Digitalmars-d-announce 
> <digitalmars-d-announce at puremagic.com>
> wrote:
>
> p.s. what i did is this:
>
>   auto tm = Timer();
>   tm.start;
>   foreach (; 0..100) {
>     auto n2d = Noise2DContext(0);
>     foreach (i; 0..100) {
>       foreach (y; 0..256) {
>         foreach (x; 0..256) {
>           auto v = n2d.get(x * 0.1f, y * 0.1f) *
>             0.5f + 0.5f;
>           pixels[y*256+x] = v;
>         }
>       }
>     }
>   }
>   tm.stop;
>   writeln(tm.toString);
>
> Timer is my simple timer class which uses MonoTime to measure 
> intervals.
> this shows ~22 seconds for both variants, with #6 and without 
> #6.
>
> and 57 seconds for variants without sse3 flags. ;-)

I'm guessing the dependency is probably due to our 
configure/build of GDC.  I'm using Arch Linux 64's default GDC 
from their repository.  Perhaps it's configured in a way that has 
these optimizations on by default.  It probably should.

Mike