Date: Thu, 16 Mar 2000 12:20:00 -0800 (PST) From: Doug Barton <Doug@gorean.org> To: "Jeffrey J. Mountin" <jeff-ml@mountin.net> Cc: Christian Weisgerber <naddy@mips.rhein-neckar.de>, freebsd-current@FreeBSD.ORG Subject: Re: gcc -Os optimisation broken (RELENG_4) Message-ID: <Pine.BSF.4.21.0003161217560.16638-100000@dt051n0b.san.rr.com> In-Reply-To: <4.3.2.20000316132120.00af5ce0@207.227.119.2>
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On Thu, 16 Mar 2000, Jeffrey J. Mountin wrote:
> Wondering why one would use -mcpu and not -march. If the code runs only on
> Celerons, PII's, and PIII's why would one *not* use -march.
>
> I'm curious about (possible) breakages with -mcpu or -march compared to -Ox
> settings which seem to break things more often than -O. Only ask, since
> -Ox and individual flags (rather than the mulititude added going from -O to
> -O2) are used far more often.
Eager to fire my new-found gun in the direction of my feet I built
world and kernel last night with -0s -march=pentium. So far so good
(although I haven't given it a real workout yet). Now that I now
'pentiumpro' should be a better choice, I'll give that a whirl
tonight. After reading the man page I had to agree with your point that
-march seemed like a better option, and I don't have cross-platform issues
to deal with here.
Doug
--
"While the future's there for anyone to change, still you know it seems,
it would be easier sometimes to change the past"
- Jackson Browne, "Fountain of Sorrow"
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