Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!bpa!cbmvax!martin
From: martin@cbmvax.commodore.com (Martin Hunt)
Newsgroups: comp.sys.amiga
Subject: Re: Lattice C questions.
Message-ID: <13270@cbmvax.commodore.com>
Date: 18 Jul 90 05:03:22 GMT
References: <1083@orange9.qtp.ufl.edu>
Reply-To: martin@cbmvax (Martin Hunt)
Distribution: na
Organization: Commodore, West Chester, PA
Lines: 74

In article <1083@orange9.qtp.ufl.edu> sutherla@qtp.ufl.edu (Scott Sutherland) writes:
>
>	I am about to delve into the world of Amiga C. (Most
>of my C programming has been on a SUN 3/50)  I have read
>many of the Amiga C books, but I am going to start simple
>so that I can learn the intricacies of the Lattice C compiler.
>I have version 5.05 installed on the Hard Disk of my A3000.
>Now, the documentation for the 5.0 version says that the 
>compiler can optimize for the 68030 chip AND can take into
>account the 68882.  I want to run some test programs (one
>of them given to me by a fellow grad student who uses it 
>as his unofficial benchmark for computer system speeds) 
>optimized for the 68030 and I want to test them both with
>the 68882 AND without it (e.g. software emulation of math 
>functions).  
>
>	As a novice to the Lattice environment, could someone
>please explain to me, with examples if possible, the major 
>compiler flags involved in optimizing for the 68030, 68882, and
>software floating point emulation?  I could ferret through
>the manual for a while and figure it out, but my friend is
>leaving Friday and he is very interested in seeing the results
>of his unofficial benchmarks.  
>
>Thanks,
>
>Scott Sutherland
>sutherla@qtp.ufl.edu
>
>BTW, this unofficial benchmark is doing a 3x3 matrix multiply
>20000 times and then checks to see what the number of calculations
>per minute are.  Here is the code.  I'd appreciate it if someone 
>would tell me if it will run UNALTERED on the A3000 AND what the
>optimum compiling options would be.
>
Except for a problem with a few '{'s that should be '}'s, the code
you posted runs as is on a 3000.
I linked in my own time() function that has higher resolution than
1 second.
>
>Source:
>
>* Program to get a "crude" estimate of the performance of a system.
>* The rate is the number of 3x3 matrix multiplies done 20000 times
>* divided by the elapsed time in seconds.
>*
>*
>* 6/24/90
>*
>* rates for Idx loop of 20000:
>*
>*
>*	Machine				rate		relative
>*------------------------------------------------------------------
>* 1 Leading Edge PC-XT 7.44 MHz		 185.19		 1.0 
>*   with 8087.
>* 2 Sun 3/280 ffpa			2857.14		15.4
>* 3 Sun 3/50  68881 			1176.47		 6.4
>* 4 Sun 3/280 SPARC		       10000.0		54.0
>* 5 Packard-Bell 386SX w/out /387	 127.39		 0.69
>*   16 MHz floating point emulation
>*
Amiga 3000/68882                        3740              20
Amiga 500                                146              .79

For the 3000, use lc -m3 -f8 -O -Lm program.c

It is rather interesting that an Amiga 500 runs this benchmark faster
than a 386SX.  


-- 
Martin Hunt                     martin@cbmvax.commodore.com
Commodore-Amiga Engineering     {uunet|pyramid|rutgers}!cbmvax!martin