[Octave-bug-tracker] [bug #56752] Performance slowdown from version 3.2.4 through to current dev branch

[John W. Eaton]

Follow-up Comment #12, bug #56752 (project octave):

Rik:  Thanks for the detailed info.

In comment #11, which .m file were you running, still the original
bm_toeplitz.m?

Function lookup is slow.  We have to check for overloaded functions.  See
fcn_info::fcn_info_rep::xfind in fcn-info.cc for all the things we look for
before finding a built-in function.  Is there some better way to do it?  For
example, is there a way to cache a previous lookup and not have to search
again if we know that the load path has not changed and no new overloaded
functions could possibly be found?

I think the lvalue thing is complicated by having to support the special
meaning of "end" inside index expressions.  As I recall, there are some weird
cases we try to handle for compatibility.  Maybe there are also better ways of
doing that.


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