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From: Martin Dowie <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: Wed, 9 Mar 2005 06:48:02 +0000 (UTC)
Organization: BT Openworld
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Xref: g2news1.google.com comp.lang.ada:8909 comp.realtime:1101
 comp.software-eng:4660
Date: 2005-03-09T06:48:02+00:00
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CTips wrote:
> Actually, I can verify that: if I look at the computer shootout 
> http://shootout.alioth.debian.org/great/, I find that gcc C beats gnat 
> Ada pretty much across the board; actually, Ada's performance sucks 
> pretty much across the board. One of gcc C or Intel C is generally among 
> the top few programs, while with a couple of exceptions, Gnat Ada is 
> around the middle. In matrix multiply it gets beaten by LISP, Java, and 
> Python!!! (How can you get beaten by Python? The mind boggles!)

It's very easy when you don't switch on _any_ optimizations! :-)

GNAT is being compiled with the equivalent of "-O0" and GCC C is getting 
"-O3".

NB: Ada2005 will be faster still now that copy-on-function-return isn't 
going to be necessary.

Cheers

-- Martin