LXR linux/arch/sh/lib/udivsi3.S

   1/* SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0
   2
   3   Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4   2004, 2005
   5   Free Software Foundation, Inc.
   6*/
   7
   8!! libgcc routines for the Renesas / SuperH SH CPUs.
   9!! Contributed by Steve Chamberlain.
  10!! sac@cygnus.com
  11
  12        .balign 4
  13        .global __udivsi3
  14        .type   __udivsi3, @function
  15div8:
  16        div1 r5,r4
  17div7:
  18        div1 r5,r4; div1 r5,r4; div1 r5,r4
  19        div1 r5,r4; div1 r5,r4; div1 r5,r4; rts; div1 r5,r4
  20
  21divx4:
  22        div1 r5,r4; rotcl r0
  23        div1 r5,r4; rotcl r0
  24        div1 r5,r4; rotcl r0
  25        rts; div1 r5,r4
  26
  27__udivsi3:
  28        sts.l pr,@-r15
  29        extu.w r5,r0
  30        cmp/eq r5,r0
  31        bf/s large_divisor
  32        div0u
  33        swap.w r4,r0
  34        shlr16 r4
  35        bsr div8
  36        shll16 r5
  37        bsr div7
  38        div1 r5,r4
  39        xtrct r4,r0
  40        xtrct r0,r4
  41        bsr div8
  42        swap.w r4,r4
  43        bsr div7
  44        div1 r5,r4
  45        lds.l @r15+,pr
  46        xtrct r4,r0
  47        swap.w r0,r0
  48        rotcl r0
  49        rts
  50        shlr16 r5
  51
  52large_divisor:
  53        mov #0,r0
  54        xtrct r4,r0
  55        xtrct r0,r4
  56        bsr divx4
  57        rotcl r0
  58        bsr divx4
  59        rotcl r0
  60        bsr divx4
  61        rotcl r0
  62        bsr divx4
  63        rotcl r0
  64        lds.l @r15+,pr
  65        rts
  66        rotcl r0
  67