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From: guy@gorodish.UUCP
Newsgroups: comp.arch
Subject: Re: subroutine frequency
Message-ID: <12341@sun.uucp>
Date: Thu, 29-Jan-87 15:19:32 EST
Article-I.D.: sun.12341
Posted: Thu Jan 29 15:19:32 1987
Date-Received: Sat, 31-Jan-87 04:22:52 EST
References: <1881@homxc.UUCP> <898@moscom.UUCP>
Sender: news@sun.uucp
Reply-To: guy@sun.UUCP (Guy Harris)
Organization: Sun Microsystems, Mountain View
Lines: 12
Keywords: register stack frame variable

> (SYSVID says they may be unpredictable :-(.

Yup, and you'll just have to live with it.  Do you really want to pay
the penalty of extra glop in every call on a 68K just to make a very
rarely-used feature work?

Furthermore, note that there is no guarantee that something *won't*
be placed into a register if it can be; optimizing compilers are
perfectly free to stick variables into registers if they can.  That's
why ANSI C says that the values of *all* automatic variables, except
those declared "volatile", are unpredictable when a "longjmp" is
done.