usr/src/lib/libbc/libc/crt/sparc/muldiv.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, 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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27         .ident  "%Z%%M% %I%     %E% SMI"
  28
  29         .file   "muldiv.s"
  30
  31 #include <SYS.h>
  32
  33         ENTRY(.udiv)
  34         wr      %g0, %g0, %y
  35         nop
  36         nop
  37         mov     %o0, %o3        ! o3 gets remainder
  38         udiv    %o0, %o1, %o0   ! o0 contains quotient a/b
  39         umul    %o0, %o1, %o4   ! o4 contains q*b
  40         retl
  41         sub     %o3, %o4, %o3   ! o3 gets a-q*b
  42         SET_SIZE(.udiv)
  43
  44         ENTRY(.div)
  45         sra     %o0,31,%o4      ! extend sign
  46         wr      %o4,%g0,%y
  47         cmp     %o1,0xffffffff  ! is divisor -1?
  48         be,a    1f              ! if yes
  49         subcc   %g0,%o0,%o0     ! simply negate dividend
  50         mov     %o0,%o3         ! o3 gets remainder
  51         sdiv    %o0,%o1,%o0     ! o0 contains quotient a/b
  52         smul    %o0,%o1,%o4     ! o4 contains q*b
  53         retl
  54         sub     %o3,%o4,%o3     ! o3 gets a-q*b
  55 1:
  56         retl
  57         mov     %g0,%o3         ! remainder is 0
  58         SET_SIZE(.div)