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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Updated: (STDCXX-226) __rw::__rw_new_capacity() uses floating point math
Date Wed, 12 Dec 2007 00:58:43 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor updated STDCXX-226:
--------------------------------

    Attachment: benchmark-stdcxx-226.c

Attached simple benchmark program to compare the runtime performance of the three approaches
discussed in the issue. Compiled with any C compiler, run as follows:

  $ time ./a.out [ 0 | 1 | 2 ] N

0 for the original algorithm
1 for the algorithm implemented in the attached patch
2 for the reciprocal multiplication approach

N the number of iterations (unsigned long)


> __rw::__rw_new_capacity() uses floating point math
> --------------------------------------------------
>
>                 Key: STDCXX-226
>                 URL: https://issues.apache.org/jira/browse/STDCXX-226
>             Project: C++ Standard Library
>          Issue Type: Improvement
>          Components: 23. Containers
>    Affects Versions: 4.1.2, 4.1.3, 4.2.0
>         Environment: all
>            Reporter: Martin Sebor
>            Assignee: Farid Zaripov
>             Fix For: 4.2.1
>
>         Attachments: benchmark-stdcxx-226.c, new_capacity.patch
>
>
> Moved from the Rogue Wave bug tracking database:
> ****Created By: sebor @ May 09, 2002 11:15:41 AM****
> The template __rw_new_capacity() uses floating point arithmetic which may be less efficient
than integer arithmetic on some architectures. Need to change to integer arithmetic and correctly
handle integer overflow.

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