usr/src/lib/libc/i386/fp/fpsetsticky.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 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 "lint.h"
  30 #include <ieeefp.h>
  31
  32 #pragma weak _fpsetsticky = fpsetsticky
  33
  34 extern int      _sse_hw;
  35 extern void     _getsw(int *), _putsw(int), _getmxcsr(int *), _putmxcsr(int);
  36
  37 fp_except
  38 fpsetsticky(fp_except s)
  39 {
  40         int             sw, mxcsr;
  41
  42         _getsw(&sw);
  43         _putsw((int)s);
  44         if (_sse_hw) {
  45                 _getmxcsr(&mxcsr);
  46                 sw |= mxcsr;
  47                 mxcsr = (mxcsr & ~0x3f) | ((int)s & 0x3f);
  48                 _putmxcsr(mxcsr);
  49         }
  50         return ((fp_except)(sw & 0x3f));
  51 }