usr/src/lib/libc/port/fp/floatdidf.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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "quadint.h"
  30
  31 #pragma weak __floatdidf = ___floatdidf
  32
  33 /*
  34  * Convert a longlong_t to a double-precision floating point value.
  35  */
  36 double
  37 ___floatdidf(longlong_t a)
  38 {
  39         union uu aa;
  40         double d;
  41
  42         aa.q = a;
  43         d = aa.sl[H];
  44         d *= (1 << HALF_BITS);
  45         d *= (1 << HALF_BITS);
  46         d += aa.ul[L];
  47
  48         return (d);
  49 }