Date: Tue, 12 Dec 2000 09:35:13 -0800 (PST) From: John Polstra <TrimYourCC@polstra.com> To: stable@freebsd.org Subject: Re: Different gcc optimisations cause IP packet CRC problems Message-ID: <200012121735.eBCHZDj48175@vashon.polstra.com> In-Reply-To: <Pine.BSF.4.21.0012111544260.36265-100000@plato.salford.ac.uk> References: <Pine.BSF.4.21.0012111544260.36265-100000@plato.salford.ac.uk>
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In article <Pine.BSF.4.21.0012111544260.36265-100000@plato.salford.ac.uk>, Mark Powell <M.S.Powell@salford.ac.uk> wrote: > I hadn't seen those comments. I didn't think gcc could be *that* > broken. Cheers. I'm going to go out on a limb here and say that I have serious doubts it's really a gcc bug. I think the problem is most likely that the constraint specifications are incorrect in some of our "asm" statements. BSD/OS uses -O2 to build kernels, and it works fine for several versions of GCC including 2.95.2 (if I remember the version number correctly). And their kernel isn't all that different from ours. A systematic review of all our "asm" statments would probably find some bugs which, when fixed, would allow us to use -O2 for building kernels. No, I'm not volunteering. :-) John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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