Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!bcm!rice!rice!sun-spots-request
From: wsrcc!wolfgang@uunet.uu.net (Wolfgang S. Rupprecht)
Newsgroups: comp.sys.sun
Subject: Re: Gnu C vs. cc
Keywords: Software
Message-ID: <1990Oct31.235041.21555@rice.edu>
Date: 1 Nov 90 00:05:27 GMT
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X-Sun-Spots-Digest: Volume 9, Issue 349, message 11
X-Original-Date: Wed, 10 Oct 90 15:33:09 GMT
X-Refs:  Original: v9n311, Replies: v9n320

>> I'm interested in the performance differences between the SunOs 4.1 cc
>> compiler vs. Gnu-C 1.37.1.  

>On the Sun/3 gcc makes a significant improvement (3 times faster in
>places) to the X server, but hardly makes any difference for Sparc or 386i
>architectures.

Well, the truth is on a SPARC (SLC if it matters) gcc 1.37.1 is sometimes
even worse than cc.  The infamous drystone string copy test runs about
19,000 drysstones with 'cc -O' and only 14,000 with 'gcc -O'.  Setting the
more esoteric gcc flags singly or in groups has little effect.  I suspect
a few 'inline' directives would help gcc's numbers but that would be
cheating.

Wolfgang Rupprecht    uunet!{nancy,usaos,media!ka3ovk}!wsrcc!wolfgang
Snail Mail Address:   Box 6524, Alexandria, VA 22306-0524