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Article #51616Re: 486 GCC instr. scheduling
From: Joe Buck
Date: Fri, 23 Apr 1993 23:39
Date: Fri, 23 Apr 1993 23:39
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1609 bytes
In article <1993Apr23.200335.4875@beaver.cs.washington.edu> mef@cs.washington.edu (Marc Fiuczynski) writes: >In an article of PC MAGAZINE (April 27, 93) "Apps Ready for Pentium" >they mention that applications that have been recompiled for Pentium >chips will also run 10 - 15 percent faster on a 486, too. > >1) Does this mean that the various 486 compilers for DOS machines don't > support instruction scheduling? I suspect that it means most DOS compilers were tuned for the 386, and some of the same instruction scheduling operations that improve speed on the Pentium also improve speed on the 486. >2) Does GCC have the inst. scheduling stuff in there to make it work > faster. GCC does instruction scheduling. Also, it has a flag -m486 to tell it to generate code assuming a 486, which will affect some optimization decisions. I suspect that as a first cut, Pentium users should try this flag when using GCC to generate code. -- Joe Buck jbuck@ohm.berkeley.edu
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 11318c,d84746f5466b9eb3 X-Google-Attributes: gid11318c,public X-Google-ArrivalTime: 1993-04-23 16:49:05 PST Path: arc1-ca.pugleaf.net!gmd.de!Germany.EU.net!mcsun!uknet!doc.ic.ac.uk!agate!forney.berkeley.edu!jbuck From: jbuck@forney.berkeley.edu (Joe Buck) Newsgroups: gnu.gcc.help Subject: Re: 486 GCC instr. scheduling Date: 23 Apr 1993 23:39:48 GMT Organization: U. C. Berkeley Lines: 24 Distribution: gnu Message-ID: <1r9uo4$6ms@agate.berkeley.edu> References: <1993Apr23.200335.4875@beaver.cs.washington.edu> NNTP-Posting-Host: forney.berkeley.edu