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Re: [avr-gcc-list] [Bug] float: 0/0 =2

From: Dave Hansen
Subject: Re: [avr-gcc-list] [Bug] float: 0/0 =2
Date: Tue, 23 Sep 2003 10:08:16 -0400

From: Bjarne Laursen <address@hidden>

I discovered another bug in the float libary:

        volatile float a;
        volatile float b;
        volatile float c;
        c= b/a; // divide returns 0x40000000 (2.0)

That's not technically a bug.  At least, not in avr-gcc.

According to n869 6.5.5p5, if the right-hand operand of either the "/" or "%" operators has the value zero, the behavior is undefined. Undefined behavior may include behavior you expect (perhaps +Inf or NaN), but it may include behavior you do not expect (such as 2.0 or nasal demons).


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