usr/src/lib/libc/port/fp/floatundisf.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include "quadint.h"
  28
  29 #pragma weak __floatundisf = ___floatundisf
  30
  31 /*
  32  * Convert an unsigned longlong_t to a single-precision floating point value.
  33  */
  34 float
  35 ___floatundisf(u_longlong_t a)
  36 {
  37         union uu aa;
  38         double d;
  39
  40         aa.uq = a;
  41         d = aa.ul[H];
  42         d *= (1 << HALF_BITS);
  43         d *= (1 << HALF_BITS);
  44         d += aa.ul[L];
  45
  46         return ((float)d);
  47 }