Date: Thu, 16 Mar 2000 02:18:55 -0500 From: Donn Miller <dmmiller@cvzoom.net> Cc: freebsd-current@freebsd.org Subject: Re: gcc -Os optimisation broken (RELENG_4) Message-ID: <38D08ADF.9C28C61E@cvzoom.net> References: <38CF48CF.59A100D7@altavista.net> <8ap8qe$hvj$1@bigeye.rhein-neckar.de> <38D08908.C629B55E@gorean.org>
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Doug Barton wrote: > Hmm... If I have a PII (Actually celeron 300A) or a PIII, which is > better, 'pentium' or 'pentiumpro'? I would think the latter, but I've > learned not to assume where gcc is concerned. I think that 'pentium' would result in code that isn't as optimized as 'pentiumpro', but I've heard that 'pentium' has a lot less problems. > Also, I have heard conflicting reports as to whether compiling the > kernel/world with optimisations is a good thing. Anyone care to (re)open > that can of worms? I compile my kernel/world with -mpentium -O3 -pipe. The only problem I've seen so far were spurious random reboots that would occur about 2-3 times a month. But, that was last summer, and hasn't happened since. Something else must have been the culprit. (Maybe -current wasn't as stable last summer.) With the aforementioned CFLAGS, I have a pretty reliable and stable system. I've heard that -mpentiumpro can be pretty buggy, and it can actually result in slower code than -mpentium for certain pentium types. I trust plain -mpentium, as it has been very reliable for me, except for some compile-time errors caused by the optimization (Qt). - Donn To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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