usr/src/lib/libc/i386/gen/lsub.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         .file   "lsub.s"
  28
  29 / Double long subtraction routine.
  30
  31 #include "SYS.h"
  32
  33         .set    lop,4
  34         .set    rop,12
  35         .set    ans,0
  36
  37         ENTRY(lsub)
  38         popl    %eax
  39         xchgl   %eax,0(%esp)
  40         movl    lop(%esp),%ecx
  41         subl    rop(%esp),%ecx
  42         movl    lop+4(%esp),%edx
  43         sbbl    rop+4(%esp),%edx
  44         movl    %ecx,ans(%eax)
  45         movl    %edx,ans+4(%eax)
  46         ret
  47         SET_SIZE(lsub)