On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
I am trying to create some fast sin, sinc, and exponential
routines to speed up some code by using tables... but it seems
it's slower than the function itself?!?
[...]
Hi, lookup tables ARE faster but the problem you have here, and
I'm surprised that nobody noticed it so far, is that YOUR SWITCH
LEADS TO A RUNTIME STRING COMPARISON AT RUNTIME. Just replace it
with a static if (Method = "Linear") { /*...*/} else { /*...*/}
Also takes care to the type used. With DMD the implicit coercion
of float and double can lead to extra conversions.
You'll directly see a 15% gain after refactoring the switch.
