Name: gm110360 Date: 04/01/2002


FULL PRODUCT VERSION :
java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-b24)
Java HotSpot(TM) Client VM (build 1.3.1-b24, mixed mode)

FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
When this program runs...

class TestFloatToInt {
    public static void main(String args[]) {
        int myInt = -7132611;
        System.out.println("Start value: " + myInt + " in
hex: " + Integer.toHexString(myInt));

        float convertToFlt = Float.intBitsToFloat(myInt);
        System.out.println("Converted, using
Float.intBitsToFloat: " + convertToFlt);

        int anotherInt = Float.floatToRawIntBits
(convertToFlt);
        System.out.println("After
Float.floatToRawIntBits: " + anotherInt +
            " in hex: " + Integer.toHexString(anotherInt));
    }
}

it produces the following output...

Start value: -7132611 in hex: ff932a3d
Converted, using Float.intBitsToFloat: NaN
After Float.floatToRawIntBits: -2938307 in hex: ffd32a3d

indicating that bit number 22 is incorrectly set during the
conversion.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run the program


EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected output:

Start value: -7132611 in hex: ff932a3d
Converted, using Float.intBitsToFloat: NaN
After Float.floatToRawIntBits: -2938307 in hex: ff932a3d

Actual output:

Start value: -7132611 in hex: ff932a3d
Converted, using Float.intBitsToFloat: NaN
After Float.floatToRawIntBits: -2938307 in hex: ffd32a3d

This bug can be reproduced always.

---------- BEGIN SOURCE ----------
class TestFloatToInt {
    public static void main(String args[]) {
        int myInt = -7132611;
        System.out.println("Start value: " + myInt + " in hex: " +
            Integer.toHexString(myInt));

        float convertToFlt = Float.intBitsToFloat(myInt);
        System.out.println("Converted, using Float.intBitsToFloat: " +
            convertToFlt);

        int anotherInt = Float.floatToRawIntBits(convertToFlt);
        System.out.println("After Float.floatToRawIntBits: " + anotherInt +
            " in hex: " + Integer.toHexString(anotherInt));
    }
}

---------- END SOURCE ----------

CUSTOMER WORKAROUND :
I was using this method when trying to byte swap floats
before writing to disk. I can find other ways to do this.
(Review ID: 144670)
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