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From: | DougEleveld <deleveld AT dds DOT nl> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: optimizations??? |
Date: | Fri, 27 Nov 1998 01:25:56 +0100 |
Organization: | Rijksuniversiteit Groningen |
Lines: | 17 |
Message-ID: | <365DF194.2A2098C@dds.nl> |
References: | <199811262004 DOT UAA00490 AT remus DOT clara DOT net> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Arthur wrote: > -O6 is the main optimisation switch for PGCC - the pentium GCC compiler. > People have had varying degrees of success with this. I have got about a 60% > speed _reduction_ by using PGCC, and stick > with -mpentium -mcpu=pentium -march=pentium and either -O2 or -O3 (depending > on what the code is like). Personally, I use -O2 -fomit-frame-pointer and -ffast-math. -march=pentium has somtimes a quite dramatic speedup (or a minor slowdown). -O3 seems to really bloat the code without all that much speedup, so I don't think it's worth it. My experience with PGCC has been the same as you. Doug Eleveld
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