From: anon@att.net
Subject: Re: GLIBC_2.14 memcpy
Date: Mon, 28 Apr 2014 12:23:53 +0000 (UTC)
Date: 2014-04-28T12:23:53+00:00 [thread overview]
Message-ID: <ljlh8n$psi$1@speranza.aioe.org> (raw)
In-Reply-To: 8d93b0b8-4cfb-43f9-b055-ad7ecf258020@googlegroups.com
Your Welcome!
The reduction in "file size" due to the fact that the linker is
only adding the new "memcpy" function instead of adding the
complete GLIBC library. Now, "GNAT Ada" uses only a small number
of routines that are contained in the GLIBC library so it is easier
to rewrite the routines when they are needed instead of trying to
use the complete standard library.
Pro: 1. Smaller footprint, reduction of dead code.
2. Easy to compile for either 32 or 64 bit mode.
3. Easy to compile for different operating environments.
Con: Code may not be at maximum optimization unless code is
written using "System.Machine_Code".
Note: For a smaller footprint, and a faster code you could
rewrite the function "Memcpy" using System.Machine_Code
package. The footprint for the machine code is round 16
instructions while the Ada optimization code version is
around 21 instructions. So, unless the increase in speed
is paramount or memory is limited the use of machine code
may not be worth the additional work.
In <8d93b0b8-4cfb-43f9-b055-ad7ecf258020@googlegroups.com>, Ian Douglas <ian@vionia.com> writes:
>On Thursday, 24 April 2014 11:56:15 UTC+2, an...@att.net wrote:
>> A simple System.Memory_Copy package
>
>Thanks, have followed your code and confirm that it works both=A0
>locally and on the server.
>
>The other thing is that the filesize dropped from 547654 to 343340=A0
>which is better but still much more than I would like :-)
>
>I did try using GNAT.IO first instead of ADA IO but that didn't work=A0
>either.
>
>Thanks again :)
>
>cheers, Ian
prev parent reply other threads:[~2014-04-28 12:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-22 13:28 GLIBC_2.14 memcpy Ian Douglas
2014-04-22 16:54 ` Tero Koskinen
2014-04-22 19:41 ` Ian Douglas
2014-04-22 21:58 ` Jeffrey Carter
2014-04-23 7:47 ` Stephen Leake
2014-04-23 11:11 ` G.B.
2014-04-23 18:30 ` Ian Douglas
2014-04-23 7:53 ` anon
2014-04-23 18:37 ` Ian Douglas
2014-04-24 9:56 ` anon
2014-04-26 20:10 ` Ian Douglas
2014-04-28 12:23 ` anon [this message]
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