Bug#100657: marked as done (sysdeps/powerpc/memset.S optimizations fail on power3 CPUs)
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and subject line Bug#100657: Power3 Memset optimisation
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Date: Tue, 12 Jun 2001 22:09:59 -0400
From: Rahul Jain <rahul@rice.edu>
To: submit@bugs.debian.org
Subject: sysdeps/powerpc/memset.S optimizations fail on power3 CPUs
Message-ID: <20010612220959.A3239@rice.edu>
Reply-To: Rahul Jain <rahul@rice.edu>
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Package: libc6
Severity: critical
The optimization for whole cache-line clearing in memset used on the powerpc
arch should not be used on the power3 CPU. The simple fix is to not use the
memset.S file at all. This bug renders debian uninstallable on power3 systems
without some serious gymnastics.
There have been a few discussions about this issue on the debian-powerpc list,
which is also included in the X-Debbugs-CC header.
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Date: Sat, 21 Dec 2002 14:10:29 -0500
From: Daniel Jacobowitz <dan@debian.org>
To: Jeff Bailey <jbailey@nisa.net>, 100657-submitter@bugs.debian.org,
100657-done@bugs.debian.org
Subject: Re: Bug#100657: Power3 Memset optimisation
Message-ID: <20021221191029.GA12850@nevyn.them.org>
References: <[🔎] 20021221175631.GE27986@nisa.net>
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On Sat, Dec 21, 2002 at 09:56:31AM -0800, Jeff Bailey wrote:
> At a very quick glance, it looks like the ChangeLog entry:
>
> 2002-08-22 Steven Munroe <sjmunroe@us.ibm.com>
>
> * sysdeps/powerpc/memset.S: Define __cache_line_size and use its
> value to select the correct stride for dcbz.
>
> might solve this bug. Can you confirm whether it does or not?
It does, for Power3. It doesn't work for the 860 but I don't know
anyone trying to run Debian on one of those.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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