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From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: Re: speed of single/double precision calculations
Message-ID: <3474@ucbvax.ARPA>
Date: Mon, 26-Nov-84 11:31:20 EST
Article-I.D.: ucbvax.3474
Posted: Mon Nov 26 11:31:20 1984
Date-Received: Tue, 27-Nov-84 04:15:46 EST
Sender: daemon@ucbvax.ARPA
Organization: University of California at Berkeley
Lines: 15

From: Mike Minnich <mminnich@udel-ee>

Bill,

If you look at the compiler output, you'll see that floats always
are converted to doubles before any computation is done.  What's more,
after the computation, the doubles are converted back to float!

As a matter of fact, my office mate found that declaring everything
double resulted in a significant decrease in run time, esp. when
doing heavy duty floating pt computations.

Do everything in double, not float.

mike