/*

 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 5037596

 * @summary Verify bitwise conversion works for non-canonical NaN values

 * @author Joseph D. Darcy

 */

import static java.lang.Float.*;

import static sun.misc.FloatConsts.*;

public class BitwiseConversion {

    static int testNanCase(int x) {

        int errors  = 0;

        // Strip out sign and exponent bits

        int y = x & SIGNIF_BIT_MASK;

        float values[] = {

            intBitsToFloat(EXP_BIT_MASK | y),

            intBitsToFloat(SIGN_BIT_MASK | EXP_BIT_MASK | y)

        };

        for(float value: values) {

            if (!isNaN(value)) {

                throw new RuntimeException("Invalid input " + y +

                                           "yielded non-NaN" + value);

            }

            int converted = floatToIntBits(value);

            if (converted != 0x7fc00000) {

                errors++;

                System.err.format("Non-canoncial NaN bits returned: %x%n",

                                  converted);

            }

        }

        return errors;

    }

    public static void main(String... argv) {

        int errors = 0;

        for (int i = 0; i < SIGNIFICAND_WIDTH-1; i++) {

            errors += testNanCase(1<<i);

        }

        if (floatToIntBits(Float.POSITIVE_INFINITY)

                != 0x7F800000) {

            errors++;

            System.err.println("Bad conversion for +infinity.");

        }

        if (floatToIntBits(Float.NEGATIVE_INFINITY)

                != 0xFF800000) {

            errors++;

            System.err.println("Bad conversion for -infinity.");

        }

        if (errors > 0)

            throw new RuntimeException();

    }

}