Help optimizing code?

[Adam D. Ruppe]

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.

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.

> - I'd use "double" instead of "real".

On my computer at least, float gave 2x speed compared to double. 
You could try both though and see which works better.