Re: comparing gnat/Ada95 and g77

[Gary Scott <scottg@flash.net>]

Hi,
Gerald Kasner wrote:
> 
> Reinert Korsnes schrieb:
> >
> > Hi,
> <snip>
> 
> It's the algorithm, not the language that matters.

Actually, the design of the language is quite significant it terms of
how easy it makes it to design a suitable optimizer.  FORTRAN 77 should
be very easy to optimize so long as you're not using integer pointers
and/or aliasing.  Fortran 95 is only slightly less "optimizable". 
C-based languages are somewhat harder to optimize typically because they
ENCOURAGE use of pointers and various aliasing tricks.  However, some of
the difference between Fortran compilers and other languages has
something to do with the fact that there are companies with 30+ years
experience tweaking their compiler (the FORTRAN 77 ones are largely
mature, not to say that all intrinsics are optimal, I keep seeing
horrible performance with simple things like circular shift).


> 
> -Gerald

-- 

Gary Scott
mailto:scottg@flash.net

mailto:webmaster@fortranlib.com
http://www.fortranlib.com

Support the GNU Fortran G95 Project:  http://g95.sourceforge.net