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From: krowitz@RICHTER.MIT.EDU (David Krowitz)
Newsgroups: comp.sys.apollo
Subject: Re:  Bug in pas compiler
Message-ID: <9010152031.AA01009@richter.mit.edu>
Date: 15 Oct 90 20:31:07 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 42

Here are my results from a DN3000 running SR10.2 (Pascal 8.7)

$ pas bug.pas -opt 0
No errors, no warnings, no info msgs, Pascal compiler 68K Rev 8.7(271)
$ bug.bin
         1
         1
$ pas bug.pas -opt 1
No errors, no warnings, no info msgs, Pascal compiler 68K Rev 8.7(271)
$ bug.bin
         1
         1
$ pas bug.pas -opt 2
No errors, no warnings, no info msgs, Pascal compiler 68K Rev 8.7(271)
$ bug.bin
         0
         1
$ pas bug.pas -opt 3
No errors, no warnings, no info msgs, Pascal compiler 68K Rev 8.7(271)
$ bug.bin
         0
         1
$ pas bug.pas -opt 4
No errors, no warnings, no info msgs, Pascal compiler 68K Rev 8.7(271)
$ bug.bin
         0
         1


Moral of the story:

There appears to be a bug in the Pascal optimizer (what else is new?) for
optimization levels 2, 3, and 4. I believe that the default optimization
level for all Apollo compilers used in the Aegis environment is opt level 3.


 -- David Krowitz

krowitz@richter.mit.edu   (18.83.0.109)
krowitz%richter.mit.edu@eddie.mit.edu
krowitz%richter.mit.edu@mitvma.bitnet
(in order of decreasing preference)