Date: Thu, 13 Feb 1997 14:43:13 -0800 (PST) From: asami@vader.cs.berkeley.edu (Satoshi Asami) To: jmb@freefall.freebsd.org Cc: hamby@aris.jpl.nasa.gov, hackers@freebsd.org Subject: Re: Sun Workshop compiler vs. GCC? Message-ID: <199702132243.OAA18747@vader.cs.berkeley.edu> In-Reply-To: <199702132215.OAA12899@freefall.freebsd.org> (jmb@freefall.freebsd.org)
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* well, options make a huge difference on sun's compiler * (SC4.0 18 Oct 1995 C 4.0) * * compare the numbers vs the options listed below * * 6009606.087651: -O5 -dalign -native -xautopar <== strange * 6051658.950850: -xO5 -dalign -native * 3290361.568528: -xO5 -dalign * 3274313.272930: -xO5 I'm not saying options don't make a huge difference, I know I can make my compiler do totally stupid things (like if I take out -O :). I don't know what the -native option does, but what I'm saying is that once the "simple" optimizations are covered, adding more and more complex optimizations (as suggested by the "taking 3 times more to compile" comment) is not going to give you much difference. Of course, if the original Sun compiler was very brain damaged, you could see a big improvement. Maybe it was running in 386 mode without -native or something? :) Satoshi
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