Performance of tables slower than built in?

Adam D. Ruppe destructionator at gmail.com
Wed May 22 00:55:37 UTC 2019


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?!?

There's intrinsic cpu instructions for some of those that can do 
the math faster than waiting on memory access.

It is quite likely calculating it is actually faster. Even 
carefully written and optimized tables tend to just have a very 
small win relative to the cpu nowadays.


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