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Re: SiByte 1480 & Branch Likely instructions?

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: SiByte 1480 & Branch Likely instructions?
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Mon, 10 Dec 2007 16:20:27 +0000 (GMT)
Cc: Kaz Kylheku <kaz@zeugmasystems.com>, linux-mips@linux-mips.org
In-reply-to: <20071210153523.GA19384@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <DDFD17CC94A9BD49A82147DDF7D545C5590CF0@exchange.ZeugmaSystems.local> <20071209051450.GA18181@linux-mips.org> <Pine.LNX.4.64N.0712101522100.1177@blysk.ds.pg.gda.pl> <20071210153523.GA19384@linux-mips.org>
Sender: linux-mips-bounce@linux-mips.org
On Mon, 10 Dec 2007, Ralf Baechle wrote:

> It would devastate the performance of some binaries.

 I think this is what the deprecation is about. ;-)

> As an intellectual challenge, how far can you strip down a MIPS
> implementation and emulate removed instructions in the kernel ;-)

 Well, going back to MIPS I is certainly achievable (OK, we could keep 
ll/sc for the sake of sanity) and then perhaps a little bit further.  
After all, all of the ALU ops can be done with the NOR op only. ;-)

  Maciej

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