Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!rochester!pt.cs.cmu.edu!andrew.cmu.edu!jk3k+
From: jk3k+@andrew.cmu.edu (Joe Keane)
Newsgroups: comp.arch
Subject: Re: Endian reversing MOVEs
Message-ID: <MXwCNKy00Uw780q0t3@andrew.cmu.edu>
Date: 9 Feb 89 01:16:06 GMT
References: <759@atanasoff.cs.iastate.edu> <MXvZBhy00W428s8WI0@andrew.cmu.edu> <772@atanasoff.cs.iastate.edu> <QXvqHvy00Vs887oooq@andrew.cmu.edu>,
	<776@atanasoff.cs.iastate.edu>
Organization: Mathematics, Carnegie Mellon, Pittsburgh, PA
Lines: 11
In-Reply-To: <776@atanasoff.cs.iastate.edu>

John Hascall writes VAX code with:
> 7 instructions, 0 memory references....
Yeah, but it's 29 bytes instead of 12, and probably a lot slower to boot.
Anyway, this is pretty silly; the RT happens to have instructions which make it
easy.  I don't know why they're there; i've never seen the compiler use them,
although gcc might.

>  p.s.  Is  ROTL #24,Rx  faster/slower than  ROTL #-8,Rx  ?  anyone?
>       I'm guessing it's faster because you can write #24 as a
>       short-literal...
It should be.