Java Float to Bit floatToIntBits(float value)

Description

float To Int Bits

License

Apache License

Declaration

static int floatToIntBits(float value) 

Method Source Code

//package com.java2s;
/*/*w  w w .  ja v a  2s.c  o m*/
 * Copyright 2010 Google Inc.
 * Copyright 2010 Daniel Bell
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

public class Main {
    private static final double LN2 = Math.log(2);

    static int floatToIntBits(float value) {
        if (Float.isNaN(value)) {
            return 0x7fc00000;
        }
        int signBit;
        if (value == 0) {
            return (1 / value == Float.NEGATIVE_INFINITY) ? 0x80000000 : 0;
        } else if (value < 0) {
            value = -value;
            signBit = 0x80000000;
        } else {
            signBit = 0;
        }
        if (value == Float.POSITIVE_INFINITY) {
            return signBit | 0x7f800000;
        }

        int exponent = (int) (Math.log(value) / LN2);
        if (exponent < -126) {
            exponent = -126;
        }
        int significand = (int) (0.5 + value * Math.exp(-(exponent - 23) * LN2));

        // Handle exponent rounding issues & denorm
        if ((significand & 0x01000000) != 0) {
            significand >>= 1;
            exponent++;
        } else if ((significand & 0x00800000) == 0) {
            if (exponent == -126) {
                return signBit | significand;
            } else {
                significand <<= 1;
                exponent--;
            }
        }
        return signBit | ((exponent + 127) << 23) | (significand & 0x007fffff);
    }
}

Related

1. floatToIntBits(final float f)
2. floatToIntBits(float value)
3. floatToShortBits(float fval)