usr/src/lib/libbc/libc/gen/common/_Q_qtou.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 1995 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 "_Qquad.h"
  30 #include "_Qglobals.h"
  31
  32 unsigned
  33 _Q_qtou(QUAD x)
  34 {
  35         unpacked        px;
  36         QUAD            c;
  37         unsigned        u,*pc = (unsigned*)&c,r;
  38         enum fp_direction_type saved_fp_direction = fp_direction;
  39
  40         pc[0] = 0x401e0000; pc[1]=pc[2]=pc[3]=0;        /* c = 2^31 */
  41         r = 0;
  42         u = *(int*)&x;  /* high part of x */
  43         if(u>=0x401e0000&&u<0x401f0000) {
  44                 r = 0x80000000;
  45                 x = _Q_sub(x,c);
  46         }
  47
  48         _fp_current_exceptions = 0;
  49         fp_direction = fp_tozero;
  50         _fp_unpack(&px, (int *)&x,fp_op_extended);
  51         _fp_pack(&px, (int *)&u,fp_op_integer);
  52         _Q_set_exception(_fp_current_exceptions);
  53         fp_direction = saved_fp_direction;
  54         return (u|r);
  55 }