From: kilgallen@eisner.decus.org (Larry Kilgallen)
Subject: Re: GNAT: Performance of String functions
Date: 1997/07/22
Date: 1997-07-22T00:00:00+00:00 [thread overview]
Message-ID: <1997Jul22.071638.1@eisner> (raw)
In-Reply-To: 5r1l6e$e0h$1@ratatosk.uio.no
In article <5r1l6e$e0h$1@ratatosk.uio.no>, tarjeij@ulrik.uio.no (Tarjei Jensen) writes:
> I suspect bounded strings will perform badly against a counted string
> implementation because assignment of strings involves copying the entire array
> whether it contains valid data or not. This makes Ada less than wonderful in
> applications that involve a lot of bounded string assignments.
No, it might affect particular _implementations_ of Ada, but I have
read no indications that counted strings would not be a valid way of
implementing bounded strings. If the Varying String datatype made
quite public by DEC Pascal were used in some Ada implementation to
implement bounded strings (and for all I know, it or something quite
close to it is) execution should be quite efficient for strings
below a certain size (ultimately one gets into page faults, cache
misses and other stack-vs-heap issues).
Larry Kilgallen
next prev parent reply other threads:[~1997-07-22 0:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-07-18 0:00 GNAT: Performance of String functions Jakob Heinemann
1997-07-18 0:00 ` Robert Dewar
1997-07-19 0:00 ` Tarjei T. Jensen
1997-07-19 0:00 ` Matthew Heaney
1997-07-20 0:00 ` Robert Dewar
1997-07-20 0:00 ` Tarjei T. Jensen
1997-07-20 0:00 ` Robert Dewar
1997-07-21 0:00 ` Tucker Taft
1997-07-21 0:00 ` Robert Dewar
1997-07-21 0:00 ` Tarjei Jensen
1997-07-21 0:00 ` Matthew Heaney
1997-07-22 0:00 ` Robert Dewar
1997-07-22 0:00 ` Tarjei Jensen
1997-07-22 0:00 ` Larry Kilgallen [this message]
1997-07-22 0:00 ` Tarjei T. Jensen
1997-07-23 0:00 ` Larry Kilgallen
1997-07-23 0:00 ` Robert Dewar
1997-07-23 0:00 ` Tarjei Jensen
1997-07-23 0:00 ` Samuel Mize
1997-07-23 0:00 ` W. Wesley Groleau x4923
1997-07-24 0:00 ` Robert A Duff
1997-07-24 0:00 ` Mats Weber
1997-07-24 0:00 ` Robert Dewar
1997-07-28 0:00 ` Mats Weber
1997-07-28 0:00 ` Matthew Heaney
1997-07-29 0:00 ` Robert Dewar
1997-07-28 0:00 ` Robert Dewar
1997-07-28 0:00 ` Robert Dewar
1997-07-24 0:00 ` Tarjei Jensen
1997-07-24 0:00 ` Matthew Heaney
1997-07-24 0:00 ` Robert Dewar
1997-07-24 0:00 ` Matthew Heaney
1997-07-22 0:00 ` Robert Dewar
1997-07-20 0:00 ` Tarjei T. Jensen
1997-07-22 0:00 ` Jakob Heinemann
1997-07-23 0:00 ` Robert Dewar
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