[avr-libc-dev] [patch #3618] Optimization strtol(), a little.

[Joerg Wunsch]

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                patch #3618, project AVR C Runtime Library

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 LATEST MODIFICATIONS of patch #3618:
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               Posted by: Joerg Wunsch <joerg_wunsch>
               Posted on: 2005-01-18 06:38 (Europe/Berlin)
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Additional Item Attachment:
File name: strtoul-20050116.tar.gz        Size:5 KB
Tarball submitted by Dmitry by way of the mailing list -- Joerg
<http://savannah.nongnu.org/patch/download.php?item_id=3618&amp;item_file_id=4060>

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 OVERVIEW of patch #3618:
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URL:
  <http://savannah.nongnu.org/patch/?func=detailitem&item_id=3618>

                 Summary: Optimization strtol(), a little.
                 Project: AVR C Runtime Library
            Submitted by: None
            Submitted on: Thu 01/06/05 at 07:14
                Category: None
                Priority: 1 - Later
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: address@hidden
             Open/Closed: Open

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It is possible to speed up strtol() by excluding division operation for most
common bases (10,16,8 and, may be, 2). I have attempt do it.

In result the quantity of clocks for `strtol("12345",0,0)' has decreased with
1680 up to 720. Use of a stack has decreased on 32 bytes. The size of a code
has remained practically same: 291 -> 294 words. (avr-gcc 3.3.4, atmega8, -Os
-frename-registers).

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Follow-up Comments:


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Date: Wed 01/12/05 at 23:12         By: Anonymous
It is difficult to bring optimization to a stop.
strtol-20050112: extra size reducing and speed up.
And tests are moved from source to separate file: strtol-tst.sh .


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Date: Fri 01/07/05 at 06:33         By: Anonymous
TODO about strings, like "0x" is fixed. Tests added. Code size now is 290
words (better), but advantage in stack usage -- only 30 bytes (on the same
compiler conditions).







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File Attachments:


-------------------------------------------------------
Date: Tue 01/18/05 at 06:38  Name: strtoul-20050116.tar.gz  Size: 5.32KB  
By: joerg_wunsch
Tarball submitted by Dmitry by way of the mailing list -- Joerg
<http://savannah.nongnu.org/patch/download.php?item_id=3618&item_file_id=4060>
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Date: Wed 01/12/05 at 23:12  Name: strtol-20050112.tar.gz  Size: 5.11KB   By:
None
Tarball with patched source and test suite.
<http://savannah.nongnu.org/patch/download.php?item_id=3618&item_file_id=4029>
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Date: Fri 01/07/05 at 06:33  Name: strtol-20050107.c  Size: 11.53KB   By:
None
TODO fixed, test expanded.
<http://savannah.nongnu.org/patch/download.php?item_id=3618&item_file_id=4003>
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Date: Thu 01/06/05 at 07:14  Name: strtol.c  Size: 8.74KB   By: None
strtol.c, optimized a little
<http://savannah.nongnu.org/patch/download.php?item_id=3618&item_file_id=4001>

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This item URL is:
  <http://savannah.nongnu.org/patch/?func=detailitem&item_id=3618>

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