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From: goldman@ucsfcca.UUCP (Eric Goldman)
Newsgroups: net.micro.6809
Subject: Re: Don't use C "register"
Message-ID: <427@ucsfcca.UUCP>
Date: Mon, 2-Dec-85 05:51:48 EST
Article-I.D.: ucsfcca.427
Posted: Mon Dec  2 05:51:48 1985
Date-Received: Thu, 5-Dec-85 05:32:50 EST
References: <593@ihwpt.UUCP>
Reply-To: goldman@ucsfcca.UUCP (Eric Goldman)
Distribution: net
Organization: UCSF Computer Center
Lines: 33

[]
In article <593@ihwpt.UUCP> knudsen@ihwpt.UUCP (mike knudsen) writes:
>
>The dhrystone benchmarks just posted
>have re-discovered what I've suspected all along:
>namely "registers" do no good, and may do harm, in MW C
>for the 6809!  ....

Oops!  My fault.  I thought I had carefully proofread the "header line"
(i.e., the line containing, "The output from... WITH...") for each result in
my posting, but I reversed them.  Tonight, I reran the benchmarks with and
without registers, just to be certain.  The results, which I am re-posting,
are, indeed, the direct output from the programs; the header lines are now
correct:

	The output from the dhrystone benchmark WITHOUT registers:

	Dhrystone time for 25000 passes = 238
	This machine benchmarks at 105 dhrystones/second
	----------------------------------------------------------
	The output from the dhrystone benchmark WITH registers:

	Dhrystone time for 25000 passes = 234
	This machine benchmarks at 106 dhrystones/second

Admittedly, the results still support your statement that registers do not
seem to do much good using OS-9 MW C for the CoCo, at least in this benchmark.
But my apologies for the erroneous posting.

--Eric S. Goldman, M.D.
  UCSF School of Medicine
  ARPA: cope.ucsf!goldman@ucsf-cgl.ARPA
  UUCP: ucbvax!ucsfmis!cope.ucsf!goldman