From bruce@dggpi2.chem.purdue.edu  Wed Jul 21 03:50:30 1993
Date: Wed, 21 Jul 93 08:50:30 -0500
From: bruce@dggpi2.chem.purdue.edu (Bruce Luxon)
Message-Id: <9307211350.AA23131@dggpi2.chem.purdue.edu>
To: chemistry@ccl.net
Subject: SGI compiler options


Howdy Netters,

Dan Severance recently wrote regarding SGI machines -

>If you have an R4000 or R4400 machine, you need to add the "-mips2" 
>option, since "-mips1" is the default (compatibility mode, will run on
>both R3000 and R4000 machines).  (The fast square-root is incorporated
>when you specify -mips2) ...
>
>   Another compiler option (fairly new) to try is the -sopt, and is
>documented in the f77 man page, and under the "fopt" manpage (-sopt
>runs the program fopt).  One user got a 40% speedup, we don't; it
>depends on your code.

I and several other users attempted this and were not able to get either 
of these options to work. I have an Indigo XS24 R4000 with the F77 compiler
3.4.1, Development option 4.0.1, and Irix 4.0.5 so I believe I have most
(but apparently not all) the goodies.

When trying to make using the -mips2 option I received the following note -

     f77: Error: malformed or unknown option -mips2
     *** Error code 2

I checked my cdroms to see if I had all the options installed and it 'appears'
I do.  What am I doing wrong or what isn't installed? 
 
Regarding -sopt, when this option was included in the makefile the compiler
seemed to go into hibernation after it encountered the first routine to 
compile.  After awhile (ca. 10 minutes) I lost patience and aborted the make.
Again, any suggestions what went wrong or I didn't do correctly?

Thanks in advance to Dan and any others with responses,

Bruce
____________________________________________________________________________
|                                      |                                   |
|"You can't always get what you want,  | Dr. Bruce A. Luxon                |
|   But if you try sometimes,          | Chemistry Department              |
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|                                      | bruce@dggpi2.chem.purdue.edu      |
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