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From: andrew@frip.gwd.tek.com (Andrew Klossner)
Newsgroups: comp.arch
Subject: Re: Endian reversing MOVEs
Message-ID: <11038@tekecs.TEK.COM>
Date: 19 Feb 89 01:07:35 GMT
References: <759@atanasoff.cs.iastate.edu> <MXvZBhy00W428s8WI0@andrew.cmu.edu> <772@atanasoff.cs.iastate.edu> <QXvqHvy00Vs887oooq@andrew.cmu.edu>
Sender: andrew@tekecs.TEK.COM
Organization: Tektronix, Wilsonville, Oregon
Lines: 17

And, for completeness, here's the endian-reversal code for the M88k
(eyeballed but not tested):

	; r2 is both src and dest; r3 is a temp
					; r2: 0123
	rot	r3,r2,24		; r3: 1230
	and.u	r3,r3,0xFF		; r3: z230
	and	r3,r3,0xFF		; r3: z2z0
	rot	r2,r2,8			; r2: 3012
	and.u	r2,r2,0xFF00		; r2: 3z12
	and	r2,r2,0xFF00		; r2: 3z1z
	or	r2,r2,r3		; r2: 3210

(As you would expect, these are all single-cycle instructions.)

  -=- Andrew Klossner   (uunet!tektronix!orca!frip!andrew)      [UUCP]
                        (andrew%frip.wv.tek.com@relay.cs.net)   [ARPA]