On Thu, Mar 16, 2000 at 10:09:37PM -0800, Doug Barton wrote:
> Donn Miller wrote:
> >
> > 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).
>
> In the interests of providing another datapoint, I tried my old, boring
> P5 machine, and with -Os -march=pentium buildworld bombed trying to
> compile cc1plus in the build tools phase. Backing off to -O worked. The
> kernel was ok with -Os -march=pentium.
In contrast, I've been using -Os -march=pentium during the last three
months for buildworld and the kernel. Never had problems whatsoever.
- Sascha
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