/* $NetBSD: floatundisf.c,v 1.4 2013/02/03 01:48:53 matt Exp $ */ /*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)floatdisf.c 8.1 (Berkeley) 6/4/93"; #else __RCSID("$NetBSD: floatundisf.c,v 1.4 2013/02/03 01:48:53 matt Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #if defined(SOFTFLOAT) || defined(__ARM_EABI__) #include "softfloat/softfloat-for-gcc.h" #endif #include "quad.h" /* * Convert (unsigned) quad to float. */ float __floatundisf(u_quad_t x) { float f; union uu u; u.q = x; /* * Now u.ul[H] has the factor of 2^32 (or whatever) and u.ul[L] * has the units. Ideally we could just set f, add INT_BITS to * its exponent, and then add the units, but this is portable * code and does not know how to get at an exponent. Machine- * specific code may be able to do this more efficiently. * * Using double here may be excessive paranoia. */ f = (double)u.ul[H] * (((int)1 << (unsigned int)(INT_BITS - 2)) * 4.0); f += u.ul[L]; return f; }