From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Array Help?
Date: Thu, 01 Mar 2012 09:03:22 -0500
Date: 2012-03-01T09:03:22-05:00 [thread overview]
Message-ID: <wcclinkxvth.fsf@shell01.TheWorld.com> (raw)
In-Reply-To: 87mx80x03h.fsf@ludovic-brenta.org
Ludovic Brenta <ludovic@ludovic-brenta.org> writes:
> Robert A Duff writes on comp.lang.ada:
>> Foo (Slide(A (3 .. 8)));
>
> Doesn't that involve copy-in and copy-out between the slice and a
> temporary object of type Slide? Grossly inefficient, methinks.
No, I don't see any need for the compiler to make a copy here.
It just needs to pass the 1..6 bounds, plus a pointer to
the array elements.
I'm too lazy to check the machine code to see whether GNAT
makes a copy, but I don't see why it would. Nor any other
Ada compiler.
- Bob
next prev parent reply other threads:[~2012-03-01 14:03 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-28 20:15 Array Help? Will
2012-02-28 20:47 ` Ludovic Brenta
2012-02-28 22:11 ` Simon Wright
2012-02-28 23:09 ` Will
2012-02-29 0:24 ` Adam Beneschan
2012-02-28 20:50 ` Gautier write-only
2012-02-28 21:33 ` Simon Wright
2012-02-29 0:27 ` Adam Beneschan
2012-02-29 8:00 ` Simon Wright
2012-02-29 8:48 ` Simon Wright
2012-02-29 0:22 ` Adam Beneschan
2012-02-29 16:09 ` Robert A Duff
2012-02-29 16:50 ` Ludovic Brenta
2012-02-29 18:24 ` Robert A Duff
2012-02-29 19:45 ` stefan-lucks
2012-02-29 20:45 ` Jeffrey Carter
2012-02-29 21:27 ` stefan-lucks
2012-02-29 23:06 ` Robert A Duff
2012-03-02 13:45 ` stefan-lucks
2012-03-07 23:58 ` Randy Brukardt
2012-03-08 11:20 ` stefan-lucks
2012-03-09 2:02 ` Randy Brukardt
2012-03-09 8:48 ` stefan-lucks
2012-03-09 21:10 ` Randy Brukardt
2012-03-15 2:55 ` BrianG
2012-03-15 7:46 ` stefan-lucks
2012-02-29 20:07 ` Dmitry A. Kazakov
2012-02-29 23:15 ` Robert A Duff
2012-03-01 8:54 ` Dmitry A. Kazakov
2012-03-01 14:06 ` Robert A Duff
2012-02-29 20:47 ` Simon Wright
2012-02-29 22:23 ` Robert A Duff
2012-02-29 23:27 ` Robert A Duff
2012-03-01 0:53 ` Adam Beneschan
2012-03-01 7:16 ` Ludovic Brenta
2012-03-01 14:03 ` Robert A Duff [this message]
2012-03-08 0:11 ` Randy Brukardt
2012-03-08 0:08 ` Randy Brukardt
2012-02-29 23:30 ` Simon Wright
2012-02-29 18:35 ` Jeffrey Carter
2012-02-29 22:59 ` Robert A Duff
2012-02-29 23:51 ` Jeffrey Carter
2012-03-01 3:03 ` Robert A Duff
2012-02-29 20:40 ` Adam Beneschan
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