/* VMFloat.java -- VM Specific Float methods Copyright (C) 2003 Free Software Foundation This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package java.lang; import gnu.classpath.Configuration; /* * This class is a reference version, mainly for compiling a class library * jar. It is likely that VM implementers replace this with their own * version that can communicate effectively with the VM. */ /** * Code relocated from java.lang.Float by * @author Dave Grove */ final class VMFloat { /** * Load native routines necessary for this class. */ static { if (Configuration.INIT_LOAD_LIBRARY) { System.loadLibrary("javalang"); } } /** * Convert the float to the IEEE 754 floating-point "single format" bit * layout. Bit 31 (the most significant) is the sign bit, bits 30-23 * (masked by 0x7f800000) represent the exponent, and bits 22-0 * (masked by 0x007fffff) are the mantissa. This function collapses all * versions of NaN to 0x7fc00000. The result of this function can be used * as the argument to Float.intBitsToFloat(int) to obtain the * original float value. * * @param value the float to convert * @return the bits of the float * @see #intBitsToFloat(int) */ static native int floatToIntBits(float value); /** * Convert the float to the IEEE 754 floating-point "single format" bit * layout. Bit 31 (the most significant) is the sign bit, bits 30-23 * (masked by 0x7f800000) represent the exponent, and bits 22-0 * (masked by 0x007fffff) are the mantissa. This function leaves NaN alone, * rather than collapsing to a canonical value. The result of this function * can be used as the argument to Float.intBitsToFloat(int) to * obtain the original float value. * * @param value the float to convert * @return the bits of the float * @see #intBitsToFloat(int) */ static native int floatToRawIntBits(float value); /** * Convert the argument in IEEE 754 floating-point "single format" bit * layout to the corresponding float. Bit 31 (the most significant) is the * sign bit, bits 30-23 (masked by 0x7f800000) represent the exponent, and * bits 22-0 (masked by 0x007fffff) are the mantissa. This function leaves * NaN alone, so that you can recover the bit pattern with * Float.floatToRawIntBits(float). * * @param bits the bits to convert * @return the float represented by the bits * @see #floatToIntBits(float) * @see #floatToRawIntBits(float) */ static native float intBitsToFloat(int bits); } // class VMFloat