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[avr-gcc-list] [BUG] float: isnan & isinf
From: |
Bjarne Laursen |
Subject: |
[avr-gcc-list] [BUG] float: isnan & isinf |
Date: |
Tue, 23 Sep 2003 13:12:44 +0200 |
I have been doing som debugging in my program using floation point.
I used the definitions from
http://www.psc.edu/general/software/packages/ieee/ieee.html
{
float a;
float b;
volatile float c;
volatile BOOL x;
a=0;
b=100;
c= b/a; // optimation inserts c=0x7F800000 (+Infinity)
x=isnan(c); // returns 0
x=isinf(c); // returns 0
}
{
volatile float a;
volatile float b;
volatile float c;
volatile BOOL x;
a=0;
b=100;
c= b/a; // divide returns 0x7FC0000000 (Not a number)
x=isnan(c); // returns 0
x=isinf(c); // returns 0
}
From the lst-file I found that 'isnan' checks for FC00XXXX and 'isinf'
checks for FFFFFFFF or 7FFFFFFF. These tests are not correct.
-Bjarne Laursen, RoseTechnology
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