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Path: utzoo!utgpu!water!watmath!clyde!ima!haddock!karl
From: karl@haddock.UUCP
Newsgroups: comp.lang.c
Subject: Re: Case fall throughs
Message-ID: <943@haddock.ISC.COM>
Date: Fri, 14-Aug-87 13:29:59 EDT
Article-I.D.: haddock.943
Posted: Fri Aug 14 13:29:59 1987
Date-Received: Sat, 15-Aug-87 17:32:02 EDT
References: <2201@zeus.TEK.COM>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 15

In article <2201@zeus.TEK.COM> dant@tekla (Dan Tilque) writes:
>... I do not advocate removing this [fallthrough] feature completely from the
>language and substituting goto case labels [because fallthrough is faster].

Any good optimizer will recognize that "goto foo; foo:" is elidable.

>However, in the common ordinary program, I think it's cleaner to do something
>like this: [statements common to more than one case factored out to a
>subprocedure]

I just had this situation occur.  I haven't yet factored it out (the code in
question modifies register variables), but I'll probably either do that or
emulate Zahn exits.

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint