Re: [PATCH 2.6] tlbwr hazard for NEC VR4100

[Yoichi Yuasa <yuasa@hh.iij4u.or.jp>]

On Thu, 2 Dec 2004 00:24:30 +0000 (GMT)
"Maciej W. Rozycki" <macro@linux-mips.org> 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.

Yoichi