[Top] [All Lists]

Re: [PATCH 2.6] tlbwr hazard for NEC VR4100

To: "Maciej W. Rozycki" <>,
Subject: Re: [PATCH 2.6] tlbwr hazard for NEC VR4100
From: Yoichi Yuasa <>
Date: Thu, 2 Dec 2004 10:56:26 +0900
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <>
On Thu, 2 Dec 2004 00:24:30 +0000 (GMT)
"Maciej W. Rozycki" <> wrote:

> 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.

The specification of VR41xx does not have the guarantee to the branch trick.
Furthermore, VR41xx has the NEC original pipeline.

I think that the present method is exact for VR41xx.


<Prev in Thread] Current Thread [Next in Thread>