IOS floating point performance
IOS floating point performance
- Subject: IOS floating point performance
- From: Trygve Inda <email@hidden>
- Date: Wed, 07 Aug 2013 13:50:54 -0700
- Thread-topic: IOS floating point performance
I have an app that is running slow. I have narrowed it down to several
functions which are trig-intensive (used to calculate the position of the
moon at a given moment and more specifically to calculate rise/set times).
To calculate the position and rise/set times for a month on average,
requires:
300 trig functions for position
24 points in time to find the correct set of three points
30 days
2 events
Total of 432,000 trig functions (mostly sin and cos)
On my iPad 3, this takes about 3 seconds, and on my desktop (2.3GHz
Quad-core i7) it is nearly instantaneous.
I am using doubles (not floats).
What can I do to speed this up?
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