[Octave-bug-tracker] [bug #42454] Re-code frequently used predicate tests in to C++ implementations for performance

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?42454>

                 Summary: Re-code frequently used predicate tests in to C++
implementations for performance
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Wed 28 May 2014 09:32:08 AM PDT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Some of the simple predicate tests, such as isscalar() or isvector(), are used
abundantly during the input validation section of most m-file functions.  It
would be beneficial to have a C++ implementation, rather than an m-file one,
to avoid interpreter overhead.

isscalar has already been coded in this patch
(https://savannah.gnu.org/patch/?8093).  The author reports a 4X speed
improvement. 






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