From: Andreas Schwab <schwab@suse.de>
To: Jim Wilson <wilson@specifixinc.com>
Cc: Richard Zidlicky <rz@linux-m68k.org>, Gunther Nikl <gni@gecko.de>,
Bernardo Innocenti <bernie@develer.com>,
Richard Henderson <rth@redhat.com>,
gcc@gcc.gnu.org
Subject: Re: [rz@linux-m68k.org: Re: m68k, extendqidi2 problem]
Date: Thu, 18 Mar 2004 10:47:00 -0000 [thread overview]
Message-ID: <jen06ecu1p.fsf@sykes.suse.de> (raw)
In-Reply-To: <1079564381.1137.25.camel@leaf.tuliptree.org> (Jim Wilson's message of "17 Mar 2004 14:59:40 -0800")
Jim Wilson <wilson@specifixinc.com> writes:
> Perhaps the 68020 case was left alone to avoid the risk of breaking it.
> Or maybe it was left alone because smi/ext is a lot easier to understand
> than movl/smi.
"move%.b %1,%R0;extb%.l %R0;move%.l %R0,%0;smi %0" should be at least as
fast as "move%.b %1,%R0;extb%.l %R0;smi %0;extb%.l %0" whereever it is
applicable, but the former is faster at least on 68020 and 68030.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2004-03-18 10:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-17 11:02 Richard Zidlicky
2004-03-17 12:20 ` Gunther Nikl
2004-03-17 20:58 ` Jim Wilson
2004-03-17 22:35 ` Richard Zidlicky
2004-03-17 23:22 ` Jim Wilson
2004-03-18 10:47 ` Andreas Schwab [this message]
2004-03-18 9:57 ` Gunther Nikl
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