Author: Vincent Diepeveen
Date: 01:17:26 09/30/02
Go up one level in this thread
On September 29, 2002 at 23:31:36, Robert Hyatt wrote: Comon you haven't even installed gcc 3.1, last time we chatted (some months ago), i already months before that told you about gcc 3.1 and you still were in the 2.95 times... >On September 29, 2002 at 11:31:35, Vincent Diepeveen wrote: > >>On September 28, 2002 at 11:12:29, Tom Likens wrote: >> >>For DIEP the gcc 3.1 compiler and further produce way >>faster code based upon enabling profiling. the 3.1+ >>gcc versions profit more from it than intel does. >> >>At a P3 even the gcc compiler is not measurable faster much, >>but the real difference happens on the k7. It seems to me >>that the intel guys of course didn't improve their compiler >>for the AMD processor. Instead it's only optimized for P4. >>Not even for P3 they achieve the best possible results, >>as GCC proves. > >I don't know what this means. I have several dozen programs (Crafty >is only one) that we have run using intel's compiler and gcc, and in >_every_ case, Intel's compiler is faster. On P2's, on P3's and on >P4's... Of course I wouldn't use intel's compiler for an AMD chip, >why would they want to optimize for a competitor's chip??? > > > >> >>I am under the impression that gcc simply is so fast for >>me simply because of better profiling capabilities. >> >>It increases speed by over 20%. >> >>>On September 27, 2002 at 23:37:43, Robert Hyatt wrote: >>> >>>[snip!] >>> >>>>>>>So reality is that the above result in reality is even more positive for >>>>>>>AMD than it looks like. We simply cannot trust these intel c++ compiles. >>>>>> >>>>>>Sure you can. I have tested the 6.0 release of their compiler exhaustively, >>>>>>comparing various optimizations with a known good executable from gcc 2.95.2, >>>>>>and the intel compiler is producing perfect code from a comparison of the >>>>>>two... >>> >>>Actually, in my tests it's producing *significantly* faster code (especially, if >>>you use the profile-enabled optimizations). >>> >>>regards, >>>--tom
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