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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.
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