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Newsgroups: comp.lang.ada
Date: Wed, 21 Jun 2017 07:29:33 -0700 (PDT)
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Subject: Re: Poor performance with GNAT-GPL-2017
From: gautier_niouzes@hotmail.com
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Xref: news.eternal-september.org comp.lang.ada:47044
Date: 2017-06-21T07:29:33-07:00
List-Id: <comp.lang.ada>

On a number-crunching program, I also get an average of +5% improvement with GPL 2017 too. It depends a lot on the kind of program, tasking or not, compiler options, part of FPU calculation, the machine itself, etc. So no general conclusion.
The compiler options I use are:

         when "Optimize" =>
            for Default_Switches ("ada") use ("-gnat12", "-gnatwu", "-O2", "-gnatpn", 
              "-funroll-loops", "-fpeel-loops", "-funswitch-loops", 
              "-ftracer", "-fweb", "-frename-registers",
              "-fpredictive-commoning", "-fgcse-after-reload", "-ftree-vectorize", "-fipa-cp-clone",
              "-ffunction-sections", 
              "-mfpmath=sse", "-msse4.2",
              "-g");

Cheers
Gautier
_____________________________________________________________
A free online game in Ada: http://pasta.phyrama.com/game.html