usr/src/lib/libm/i386/src/truncl.s

   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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29         .file   "truncl.s"
  30
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(truncl,function)
  33
  34         ENTRY(truncl)
  35         movl    %esp,%eax
  36         subl    $8,%esp
  37         fstcw   -8(%eax)
  38         fldt    4(%eax)
  39         movw    -8(%eax),%cx
  40         orw     $0x0c00,%cx
  41         movw    %cx,-4(%eax)
  42         fldcw   -4(%eax)                / set RD = to_zero
  43         frndint
  44         fstcw   -4(%eax)
  45         movw    -4(%eax),%dx
  46         andw    $0xf3ff,%dx
  47         movw    -8(%eax),%cx
  48         andw    $0x0c00,%cx
  49         orw     %dx,%cx
  50         movw    %cx,-8(%eax)
  51         fldcw   -8(%eax)                / restore RD
  52         addl    $8,%esp
  53         ret
  54         .align  4
  55         SET_SIZE(truncl)