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From: dws@tolerant.UUCP (Dave W. Smith)
Newsgroups: net.lang.c
Subject: Re: Re: Registers on the VAX 11/780?
Message-ID: <121@tolerant.UUCP>
Date: Fri, 19-Jul-85 14:11:19 EDT
Article-I.D.: tolerant.121
Posted: Fri Jul 19 14:11:19 1985
Date-Received: Mon, 22-Jul-85 06:47:08 EDT
References: <2238@uvacs.UUCP> <574@ucsfcgl.UUCP> <886@umcp-cs.UUCP>
Organization: Tolerant Systems, Inc.  San Jose, CA
Lines: 24

> >>... but how many register variables can I declare in a function on
> >>the VAX 11/780?
> 
> In probably all the PCC derived Vax C compilers, the number is 6,
> not 5.

A little known fact about PCC based C compilers is that you can recycle
registers with a function by using nested scopes.  Example (for 11/780):

	f()
	{ register int foo;		/* r11 */

	    { register int bar;		/* r10 */
		...
	    }

	    { register int baz;		/* r10 */
		...
	    }
	}
-- 
  David W. Smith             {ucbvax}!tolerant!dws
  Tolerant Systems, Inc.
  408/946-5667