From:	aho450s AT nic DOT smsu DOT edu (Tony O'Bryan)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: floating point is... fast???
Date:	Sun, 19 Jan 1997 13:37:21 GMT
Organization:	Southwest Missouri State University
Lines:	11
Message-ID:	<32e22337.2066519@ursa.smsu.edu>
References:	<5brd2e$dap AT lyra DOT csx DOT cam DOT ac DOT uk>
NNTP-Posting-Host:	forseti.i53.smsu.edu
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

On 18 Jan 1997 20:50:22 GMT, gpt20 AT thor DOT cam DOT ac DOT uk (G.P. Tootell) wrote:

>while using the profiler on some code i had written i noticed that changing a
>floating point multiply to an unsigned multiply of 2 longs turned out to be
>slower. in fact floating point multiply appears to be faster than ordinary
>integer multiply for any case. is this actually true? and if so is there any
>reason i shouldn't just change every multiply in my code to make sure it's
>floating point?

My timing manual only goes up to the 486.  The FMUL takes from 11 to 16 clocks,
where the 486 takes 13 to 42 clocks.

- Raw text -