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Re: [PATCH 2.6] tlbwr hazard for NEC VR4100

To: Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>
Subject: Re: [PATCH 2.6] tlbwr hazard for NEC VR4100
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Thu, 2 Dec 2004 00:24:30 +0000 (GMT)
Cc: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>, Ralf Baechle <ralf@linux-mips.org>, linux-mips <linux-mips@linux-mips.org>
In-reply-to: <20041202000713.GO3225@rembrandt.csv.ica.uni-stuttgart.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20041201234943.584d88e8.yuasa@hh.iij4u.or.jp> <20041202000713.GO3225@rembrandt.csv.ica.uni-stuttgart.de>
Sender: linux-mips-bounce@linux-mips.org
On Thu, 2 Dec 2004, Thiemo Seufer wrote:

> If 64bit kernels are ever relevant for VR41xx, you might want to use
> the same branch trick as it is used for R4[04]00. IIRC it reduced the
> handler size from 34 to 30 instructions, saving another branch.

 Isn't that based on specific properties of the R4[04]00 pipeline?  It may
still work for the VR41xx, but you can't take it for granted, so it should
be double-checked.  Given the conditions it's probably worth the hassle,
though.

  Maciej

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