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From: ingoldsby@calgary.UUCP (Terry Ingoldsby)
Newsgroups: net.micro.6809
Subject: Microware C Compiler Bugs
Message-ID: <204@vaxb.calgary.UUCP>
Date: Wed, 18-Jun-86 12:15:06 EDT
Article-I.D.: vaxb.204
Posted: Wed Jun 18 12:15:06 1986
Date-Received: Fri, 20-Jun-86 03:24:33 EDT
Organization: U. of Calgary, Calgary, Ab.
Lines: 37
Keywords: C Compiler Bugs

I've been meaning to do this for some time, but have never gotten around
to it.  I was wondering how many people have found bugs in the Microware
OS9 C compiler, specifically the CoCo implementation sold by RS.  I've
found at least one:

    The bug involves using arrays and the `&' and `|' operators.  For
    example

        unsigned array[10];
        unsigned var;

    Any use of statements like

        var & array[1]   actually compile as   var & array[0]

    This can be corrected by using

        array[1] & var

    but if you are trying to & two array values, the one on the right
    hand side of the & will be indexed at zero.

I wrote Radio Shack about it, and they said that this was indeed a bug,
and that they would fix it in the next version.  Unfortunately, they
said that they had no current plans to release another version anytime
soon.  Does anyone know if there is a fix for this?

On another, related note.  I am doing some number crunching using this
compiler, and frequently get the error #40, Floating point under/overflow
error.  This usually stems from multiplying two very small numbers together.
I can, of course, put tests on every multiplication but this is very
inefficient.  What I would like to do is catch the signal, get hold of
the over/underflowed value, fix it, and get the corrected value back
to the multiplication statement.  Is this asking too much?  Why don't
I have this problem on other compilers?

		Terry Ingoldsby