arch/sh/lib/udiv_qrnnd.S

   1 /* Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2    2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4
   5 This file is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 In addition to the permissions in the GNU General Public License, the
  11 Free Software Foundation gives you unlimited permission to link the
  12 compiled version of this file into combinations with other programs,
  13 and to distribute those combinations without any restriction coming
  14 from the use of this file.  (The General Public License restrictions
  15 do apply in other respects; for example, they cover modification of
  16 the file, and distribution when not linked into a combine
  17 executable.)
  18
  19 This file is distributed in the hope that it will be useful, but
  20 WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22 General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with this program; see the file COPYING.  If not, write to
  26 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  27 Boston, MA 02110-1301, USA.  */
  28
  29 !! libgcc routines for the Renesas / SuperH SH CPUs.
  30 !! Contributed by Steve Chamberlain.
  31 !! sac@cygnus.com
  32
  33 !! ashiftrt_r4_x, ___ashrsi3, ___ashlsi3, ___lshrsi3 routines
  34 !! recoded in assembly by Toshiyasu Morita
  35 !! tm@netcom.com
  36
  37 /* SH2 optimizations for ___ashrsi3, ___ashlsi3, ___lshrsi3 and
  38    ELF local label prefixes by J"orn Rennecke
  39    amylaar@cygnus.com  */
  40
  41         /* r0: rn r1: qn */ /* r0: n1 r4: n0 r5: d r6: d1 */ /* r2: __m */
  42         /* n1 < d, but n1 might be larger than d1.  */
  43         .global __udiv_qrnnd_16
  44         .balign 8
  45 __udiv_qrnnd_16:
  46         div0u
  47         cmp/hi r6,r0
  48         bt .Lots
  49         .rept 16
  50         div1 r6,r0
  51         .endr
  52         extu.w r0,r1
  53         bt 0f
  54         add r6,r0
  55 0:      rotcl r1
  56         mulu.w r1,r5
  57         xtrct r4,r0
  58         swap.w r0,r0
  59         sts macl,r2
  60         cmp/hs r2,r0
  61         sub r2,r0
  62         bt 0f
  63         addc r5,r0
  64         add #-1,r1
  65         bt 0f
  66 1:      add #-1,r1
  67         rts
  68         add r5,r0
  69         .balign 8
  70 .Lots:
  71         sub r5,r0
  72         swap.w r4,r1
  73         xtrct r0,r1
  74         clrt
  75         mov r1,r0
  76         addc r5,r0
  77         mov #-1,r1
  78         bf/s 1b
  79          shlr16 r1
  80 0:      rts
  81          nop