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From: mcm@rti.UUCP (Mike Mitchell)
Newsgroups: comp.unix.wizards,comp.lang.c,comp.unix.questions
Subject: Re: New feature of Ultrix C compilers
Message-ID: <1748@rti.UUCP>
Date: Mon, 28-Sep-87 19:18:59 EDT
Article-I.D.: rti.1748
Posted: Mon Sep 28 19:18:59 1987
Date-Received: Wed, 30-Sep-87 01:16:14 EDT
References: <867@sask.UUCP> <4380@teddy.UUCP>
Reply-To: mcm@rti.UUCP (Mike Mitchell)
Organization: Research Triangle Institute, RTP, NC
Lines: 12
Keywords: VAX C
Xref: mnetor comp.unix.wizards:4559 comp.lang.c:4609 comp.unix.questions:4308

I've noticed that the compiler inserts NOOP's and HALT's to align branch
targets and subroutines to long-word boundries.  This is not necessary on
a VAX, but I guess that the pre-fetches in the instruction unit could
throw out the noops when it sees them.  Aligning things to 32-bit boundries
might make it a little faster.  I have not done any timings to confirm this.
Besides, what is faster for a uVAX-II might be slower for an 8600.  Who knows
what CPU they optimized the code generator for?
-- 
Mike Mitchell	{decvax,seismo,ihnp4,philabs}!mcnc!rti!mcm  mcm@rti.rti.org

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