git.sur5r.net Git - u-boot/blob - arch/sh/lib/udivsi3.S

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /* Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005
   4    Free Software Foundation, Inc.
   5  */
   6
   7 !! libgcc routines for the Renesas / SuperH SH CPUs.
   8 !! Contributed by Steve Chamberlain.
   9 !! sac@cygnus.com
  10
  11         .balign 4
  12         .global __udivsi3
  13         .type   __udivsi3, @function
  14 div8:
  15         div1 r5,r4
  16 div7:
  17         div1 r5,r4; div1 r5,r4; div1 r5,r4
  18         div1 r5,r4; div1 r5,r4; div1 r5,r4; rts; div1 r5,r4
  19
  20 divx4:
  21         div1 r5,r4; rotcl r0
  22         div1 r5,r4; rotcl r0
  23         div1 r5,r4; rotcl r0
  24         rts; div1 r5,r4
  25
  26 __udivsi3:
  27         sts.l pr,@-r15
  28         extu.w r5,r0
  29         cmp/eq r5,r0
  30         bf/s large_divisor
  31         div0u
  32         swap.w r4,r0
  33         shlr16 r4
  34         bsr div8
  35         shll16 r5
  36         bsr div7
  37         div1 r5,r4
  38         xtrct r4,r0
  39         xtrct r0,r4
  40         bsr div8
  41         swap.w r4,r4
  42         bsr div7
  43         div1 r5,r4
  44         lds.l @r15+,pr
  45         xtrct r4,r0
  46         swap.w r0,r0
  47         rotcl r0
  48         rts
  49         shlr16 r5
  50
  51 large_divisor:
  52         mov #0,r0
  53         xtrct r4,r0
  54         xtrct r0,r4
  55         bsr divx4
  56         rotcl r0
  57         bsr divx4
  58         rotcl r0
  59         bsr divx4
  60         rotcl r0
  61         bsr divx4
  62         rotcl r0
  63         lds.l @r15+,pr
  64         rts
  65         rotcl r0