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Date:      Tue, 10 Apr 2001 21:39:36 -0400
From:      Graywane <graywane@home.com>
To:        David Xu <bsddiy@21cn.com>
Cc:        "David O'Brien" <obrien@FreeBSD.ORG>, "Bruce A. Mah" <bmah@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject:   Re: cvs commit: src/contrib/gcc ChangeLog Makefile.in NEWS alias.c c-decl.c c-typeck.c calls.c cccp.c collect2.c combine.c configure configure.in cppinit.c cse.c dwarf2.h dwarf2out.c emit-rtl.c except.c expmed.c expr.c expr.h final.c flow.c fold-const.c ...
Message-ID:  <20010410213936.B1399@home.com>
In-Reply-To: <111507748.20010411092055@21cn.com>; from bsddiy@21cn.com on Wed, Apr 11, 2001 at 09:20:55AM %2B0800
References:  <200104101923.f3AJNgW78616@freefall.freebsd.org> <200104101935.f3AJZ0i20733@bmah-freebsd-0.cisco.com> <20010410124228.A52966@dragon.nuxi.com> <111507748.20010411092055@21cn.com>

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On Wed, Apr 11, 2001 at 09:20:55AM +0800, David Xu wrote:
> Coooool!
> but sorry, an old topic: is it safe to compile kernel in -O2 now?

The strength reduce problems on Intel and other platforms with small
register sets have not been fixed. The example program that demonstrates the
bug changes in subtle ways from release to release but it isn't fixed yet.
I'd add -fno-strength-reduce if you just HAVE to use -O2. I've been bitten
by the bug too many times so I stick with -O for everything.

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