Help optimizing code?

[Muld]

On Monday, 1 January 2018 at 15:54:33 UTC, Adam D. Ruppe wrote:
> On Monday, 1 January 2018 at 15:29:28 UTC, user1234 wrote:
>>     dmd mandelbrot.d -O -release -inline -boundscheck=off
>
> -O and -inline are OK, but -release and -boundscheck are 
> harmful and shouldn't be used. Yeah, you can squeeze a bit of 
> speed out of them, but there's another way to do it - `.ptr` on 
> the individual accesses or versioning out unwanted `assert` 
> statements - and those avoid major bug and security baggage 
> that -release and -boundscheck=off bring.

If you use .ptr then you get zero detection, even in debug builds.

> In this program, I didn't see a major improvement with the 
> boundscheck skipping... and in this program, it seems to be 
> written without the bugs, but still, I am against that switch 
> on principle. It is so so so easy to break things with them.

In this program, it's relatively small and doesn't look like it 
does its calculations in realtime. I'd rather there be a 
potential bug than the program running to slow to be usable, or 
have zero debugging for indices in debug builds.