RE: [oc] New 64bit instructions for 32bit processor cores analogy

[Jonathan D Bradbury <jdb2@andrew.cmu.edu>]

You might be interested in looking at the PISA architecture used by a
processor simulator called SimpleScalar.  It is a 64-bit instruction set
that can easily be modified.  They even have a port of gcc and all of the
binutils for it.  The simulator they have is poorly written (fast but
impossible to understand their code).  It might be a place to start and
work from.  The web page is www.simplescalar.com

Jonathan

On Tue, 11 Dec 2001, Paul McFeeters wrote:

> Dani,
>
> Wouldn't matter much on my PC, disk access is so slow I sometimes wonder
> whether I'm accessing the floppy or not. Gotta love Win98, when I dual
> boot to Win2K the same performance program rates the same drives at
> 5x faster. Good old Microsoft, now where did I leave my voodoo doll?
>
> Yes a variable length instruction is possible and available commercially.
> www.motorola.com/coldfire products use it. They call it VL-RISC which
> presumably stands for Variable Length RISC. Looked at using their CPUs
> in some projects briefly before I discovered FPGAs. They are aimed at
> SoC type areas hence the processors have everything up to and including
> Ethernet/USB ports on them. Harvard memory architecture, built-in DRAM
> controllers (except the lower 2 models) and other things. It might have
> even have a 10 stage pipeline, 10 blocks in the diagram anyway ;-)
>
> Still working on the computer with a CPU core for the Linux project so
> maybe crack that one when I can devote some time to it. :)
>
> Paul
>
> -----Original Message-----
> From: owner-cores@opencores.org [mailto:owner-cores@opencores.org]On
> Behalf Of Daniel Haensse
> Sent: 11 December 2001 12:38
> To: cores@opencores.org
> Subject: Re: [oc] New 64bit instructions for 32bit processor cores
> analogy
>
>
> Paul,
>
> the problem will be that your harddisk will swap 4x as much and read/write
> larger data or code from the harddisk. What do you think about a variable
> instruction length, instead of a fixed 64 bit length? Is this possible?
>
> Dani
>
>
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