AVR C Runtime Library - Patches: patch #3592, Reassigned item: speedup tanh...
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patch #3592: Reassigned item: speedup tanh function in libm
Submitter: | None | ||
Submitted: | Wed 22 Dec 2004 10:23:15 PM UTC | ||
Category: | None | Priority: | 7 - High |
Status: | Done | Privacy: | Public |
Assigned to: | None | Originator Email: | -email is unavailable- |
Open/Closed: | Closed |
Wed 22 Dec 2004 10:23:15 PM UTC, comment #1: |
Eric Weddington <arcanum> |
Wed 22 Dec 2004 10:23:15 PM UTC, original submission:
The current code uses sinh/cosh which results in 2 calls to exp (each function calls it once) where the other variant (commented out in tanh.S) would only need it once. (it would also save 2 calls of inverse and 1 of ldexp and saves memory by not needing cosh/sinh)
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Anonymous |
Depends on the following items: None found
Items that depend on this one: None found
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Follow 5 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2005-11-13 | aesok | Status | None | Done | |
Assigned to | aesok | None | |||
Open/Closed | Open | Closed | |||
2005-11-13 | aesok | Assigned to | None | aesok | |
2004-12-22 | arcanum | Reassign item | From group AVR C Runtime Library, bugs tracker | To group AVR C Runtime Library, patch tracker |
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Corresponding source code
This item has been reassigned from the project AVR C Runtime Library bugs tracker to your tracker.
The original report is still available at bugs #10413
Following are the information included in the original report:
[field #0] Item ID: 10413
[field #1] Group ID: 2140
[field #2] Status: Open
[field #3] Severity: 5 - Average
[field #4] Privacy: Public
[field #5] Category: Library
[field #6] Submitted by: None
[field #7] Assigned to: None
[field #8] Submitted on: Thu 09/16/2004 at 14:41
[field #9] Summary: speedup tanh function in libm
[field #10] Original Submission: The current code uses sinh/cosh which results in 2 calls to exp (each function calls it once) where the other variant (commented out in tanh.S) would only need it once. (it would also save 2 calls of inverse and 1 of ldexp and saves memory by not needing cosh/sinh)
The problem is the other code has a bug. It gives to the ldexp function an 1-byte-parameter where it should be 2 bytes. (see the 2 lines before the call of ldexp.)
Appended is a file which uses this other variant and has this bug fixed. (It speedsup my application which uses tanh extensively about 40%.)
[field #12] Item Group: None
[field #13] Resolution: None
[field #14] Component Version: None
[field #15] Platform Version: None
[field #16] Reproducibility: None
[field #17] Size (loc): None
[field #18] Fixed Release: None
[field #19] Planned Release: None
[field #20] Effort: 0.00
[field #24] Priority: 7 - High
[field #27] Percent Complete: 0%
[field #29] Release: None
[field #32] Originator Email: R.Liebscher@gmx.de
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