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From: pdg@ihdev.UUCP (P. D. Guthrie)
Newsgroups: net.lang.c
Subject: Re: This Sentence is False
Message-ID: <314@ihdev.UUCP>
Date: Fri, 13-Sep-85 15:21:31 EDT
Article-I.D.: ihdev.314
Posted: Fri Sep 13 15:21:31 1985
Date-Received: Sat, 14-Sep-85 07:16:42 EDT
References: <1118@brl-tgr.ARPA> <139200010@uiucdcsb> <188@graffiti.UUCP>
Organization: AT&T Bell Laboratories
Lines: 28

> > > ... But no machine I know of has a `branch if true' instruxion...
> 
> On the 6809 branch always is implemented as branch if true. They also
> have a branch if false which acts as a skip. They call it branch never.

*** Oh Line eater, line eater, wherefor art thou? ***

On a Dec-20, you have a huge number of strange instructions, including :
(no flames if I don't remember correctly -- it's been years)

skipn : skip never
jumpn : jump never
skipa : skip always
jumpa : jump always
skip  : skip
jump  : jump

I don't believe that there is any difference between skipa and skip and
also between jumpa and jump, but the extra forms are kept in to make
a complete instruction set. By the way, this beastie also has a
36 bit word!!

What does this discussion have to do with net.lang.c anyway?

						Paul Guthrie.

Any opinions expresses herein (whether right or wrong) have been
generated by the `babble' program.