From: Ralf Baechle <ralf@linux-mips.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
Dominic Sweetman <dom@mips.com>,
Eric Christopher <echristo@redhat.com>,
Long Li <long21st@yahoo.com>,
Linux/MIPS Development <linux-mips@linux-mips.org>,
David Ung <davidu@mips.com>, Nigel Stephens <nigel@mips.com>
Subject: Re: gcc support of mips32 release 2
Date: Fri, 19 Mar 2004 13:55:02 +0100 [thread overview]
Message-ID: <20040319125502.GA32363@linux-mips.org> (raw)
In-Reply-To: <Pine.GSO.4.58.0403191141290.2173@waterleaf.sonytel.be>
On Fri, Mar 19, 2004 at 11:42:11AM +0100, Geert Uytterhoeven wrote:
> > Take a look at the 68020 to see where instruction set madness can lead:
> >
> > movel ([42, a0, d0.2*2],123), ([43, a0, d0.2*2], 22)
> > bfextu ([42, a0, d0.2*2],123){8:8}, d2
>
> These instructions didn't complete in 1 cycle, while the new RISCies do.
That's the point, they went overboard with their C^2ISC philosophy. These
instructions were more or less unusable by compilers of the time and the
given the rarity were not the most performant instructions of the
architecture either, so made sense only relativly rarely. So in the end
the didn't get it right in the beginning which lead to the removal of the
instruction in 060, if I recall right.
Ralf
next prev parent reply other threads:[~2004-03-19 12:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-05 7:55 gcc support of mips32 release 2 Long Li
2004-03-05 9:14 ` Eric Christopher
2004-03-05 10:12 ` Dominic Sweetman
2004-03-05 10:12 ` Dominic Sweetman
2004-03-05 17:03 ` Long Li
2004-03-08 11:11 ` Dominic Sweetman
2004-03-08 12:15 ` David Ung
2004-03-08 17:45 ` Eric Christopher
2004-03-18 13:18 ` Maciej W. Rozycki
2004-03-18 14:10 ` Dominic Sweetman
2004-03-18 21:19 ` Ralf Baechle
2004-03-19 13:44 ` Maciej W. Rozycki
2004-03-22 9:42 ` Dominic Sweetman
2004-03-22 11:14 ` Maciej W. Rozycki
2004-03-22 14:49 ` Dominic Sweetman
2004-03-22 16:19 ` Michael Uhler
2004-03-18 16:52 ` Michael Uhler
2004-03-18 21:37 ` Ralf Baechle
2004-03-19 10:42 ` Geert Uytterhoeven
2004-03-19 12:55 ` Ralf Baechle [this message]
2004-03-24 12:38 ` Goswin von Brederlow
2004-03-24 13:52 ` Ralf Baechle
2004-03-24 17:57 ` Dominic Sweetman
2004-03-19 13:47 ` Maciej W. Rozycki
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