patchAVR C Runtime Library - Patches: patch #6680, Sine, cosine functions


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patch #6680: Sine, cosine functions

Submitter:  Ruud <ruud62>
Submitted:  Mon 24 Nov 2008 01:13:45 PM UTC
Category:  None Priority:  3 - Low
Status:  None Privacy:  Public
Assigned to:  dmix Open/Closed:  Open

Thu 12 May 2011 10:30:13 PM UTC, comment #2: 

Dmitry, could you please take a look at these patches?

Eric Weddington <arcanum>
Group administrator
Tue 08 Jun 2010 11:51:00 AM UTC, comment #1: 

Dmitry is our Mr. libm.

Joerg Wunsch <joerg_wunsch>
Group administrator
Mon 24 Nov 2008 01:13:45 PM UTC, original submission:  

Hi All,
I listed this under patches, if this is wrong I'm sorry..

The issues are the sine, cosine functions. When I started to try to speed-up the sine function I noticed that version 1.6.3 was quite inaccurate (errors as much as 2 times the lsb). So I made a quick draft of an improved? Version.. See attached file fp_sinus2. This is by no means intended as a final version, but is merely meant as an quick draft which needs improving and splitting (powsodd should be used by tan, tanh… etc). The results however are quite good. See attached sintest.txt (written with notepad windows).  More than twice the speed and much better accuracy..

Ruud <ruud62>
Group Member


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Attached Files
file #16912:  sintest.txt added by ruud62 (2KiB - text/plain)
file #16913:  fp_sinus2.s added by ruud62 (4KiB - text/plain)


Depends on the following items: None found

Items that depend on this one: None found


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  • -email is unavailable- added by arcanum (Posted a comment)
  • -email is unavailable- added by joerg_wunsch (Posted a comment)
  • -email is unavailable- added by ruud62 (Submitted the item)

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2010-06-08 joerg_wunsch Assigned toNone dmix
    2008-11-24 ruud62 Attached File- Added sintest.txt, #16912
        Attached File- Added fp_sinus2.s, #16913

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