usr/src/lib/libc/sparcv9/fp/fpsetrnd.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 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30         .file   "fpsetrnd.s"
  31
  32 #include "SYS.h"
  33
  34         ANSI_PRAGMA_WEAK(fpsetround,function)
  35
  36         ENTRY(fpsetround)
  37         add     %sp, -SA(MINFRAME), %sp ! get an additional word of storage
  38         set     0xc0000000, %o4         ! mask of round control bits
  39         sll     %o0, 30, %o1            ! move input bits into position
  40         st      %fsr, [%sp+STACK_BIAS+ARGPUSH]  ! get fsr value
  41         ld      [%sp+STACK_BIAS+ARGPUSH], %o0   ! load into register
  42         and     %o1, %o4, %o1           ! generate new fsr value
  43         andn    %o0, %o4, %o2
  44         or      %o1, %o2, %o1
  45         st      %o1, [%sp+STACK_BIAS+ARGPUSH]   ! move new fsr value to memory
  46         ld      [%sp+STACK_BIAS+ARGPUSH], %fsr  ! load fsr with new value
  47         srl     %o0, 30, %o0            ! return old round control value
  48         retl
  49         add     %sp, SA(MINFRAME), %sp  ! reclaim stack space
  50
  51         SET_SIZE(fpsetround)