arch/sparc/lib/divdi3.S

   1 /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   2
   3 This file is part of GNU CC.
   4
   5 GNU CC is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU CC is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU CC; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #include <asm/export.h>
  21         .text
  22         .align 4
  23         .globl __divdi3
  24 __divdi3:
  25         save %sp,-104,%sp
  26         cmp %i0,0
  27         bge .LL40
  28         mov 0,%l4
  29         mov -1,%l4
  30         sub %g0,%i1,%o0
  31         mov %o0,%o5
  32         subcc %g0,%o0,%g0
  33         sub %g0,%i0,%o0
  34         subx %o0,0,%o4
  35         mov %o4,%i0
  36         mov %o5,%i1
  37 .LL40:
  38         cmp %i2,0
  39         bge .LL84
  40         mov %i3,%o4
  41         xnor %g0,%l4,%l4
  42         sub %g0,%i3,%o0
  43         mov %o0,%o3
  44         subcc %g0,%o0,%g0
  45         sub %g0,%i2,%o0
  46         subx %o0,0,%o2
  47         mov %o2,%i2
  48         mov %o3,%i3
  49         mov %i3,%o4
  50 .LL84:
  51         cmp %i2,0
  52         bne .LL45
  53         mov %i1,%i3
  54         cmp %o4,%i0
  55         bleu .LL46
  56         mov %i3,%o1
  57         mov     32,%g1
  58         subcc   %i0,%o4,%g0
  59 1:      bcs     5f
  60          addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
  61         sub     %i0,%o4,%i0     ! this kills msb of n
  62         addx    %i0,%i0,%i0     ! so this cannot give carry
  63         subcc   %g1,1,%g1
  64 2:      bne     1b
  65          subcc  %i0,%o4,%g0
  66         bcs     3f
  67          addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
  68         b       3f
  69          sub    %i0,%o4,%i0     ! this kills msb of n
  70 4:      sub     %i0,%o4,%i0
  71 5:      addxcc  %i0,%i0,%i0
  72         bcc     2b
  73          subcc  %g1,1,%g1
  74 ! Got carry from n.  Subtract next step to cancel this carry.
  75         bne     4b
  76          addcc  %o1,%o1,%o1     ! shift n1n0 and a 0-bit in lsb
  77         sub     %i0,%o4,%i0
  78 3:      xnor    %o1,0,%o1
  79         b .LL50
  80         mov 0,%o2
  81 .LL46:
  82         cmp %o4,0
  83         bne .LL85
  84         mov %i0,%o2
  85         mov 1,%o0
  86         mov 0,%o1
  87         wr %g0, 0, %y
  88         udiv %o0, %o1, %o0
  89         mov %o0,%o4
  90         mov %i0,%o2
  91 .LL85:
  92         mov 0,%g3
  93         mov     32,%g1
  94         subcc   %g3,%o4,%g0
  95 1:      bcs     5f
  96          addxcc %o2,%o2,%o2     ! shift n1n0 and a q-bit in lsb
  97         sub     %g3,%o4,%g3     ! this kills msb of n
  98         addx    %g3,%g3,%g3     ! so this cannot give carry
  99         subcc   %g1,1,%g1
 100 2:      bne     1b
 101          subcc  %g3,%o4,%g0
 102         bcs     3f
 103          addxcc %o2,%o2,%o2     ! shift n1n0 and a q-bit in lsb
 104         b       3f
 105          sub    %g3,%o4,%g3     ! this kills msb of n
 106 4:      sub     %g3,%o4,%g3
 107 5:      addxcc  %g3,%g3,%g3
 108         bcc     2b
 109          subcc  %g1,1,%g1
 110 ! Got carry from n.  Subtract next step to cancel this carry.
 111         bne     4b
 112          addcc  %o2,%o2,%o2     ! shift n1n0 and a 0-bit in lsb
 113         sub     %g3,%o4,%g3
 114 3:      xnor    %o2,0,%o2
 115         mov %g3,%i0
 116         mov %i3,%o1
 117         mov     32,%g1
 118         subcc   %i0,%o4,%g0
 119 1:      bcs     5f
 120          addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
 121         sub     %i0,%o4,%i0     ! this kills msb of n
 122         addx    %i0,%i0,%i0     ! so this cannot give carry
 123         subcc   %g1,1,%g1
 124 2:      bne     1b
 125          subcc  %i0,%o4,%g0
 126         bcs     3f
 127          addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
 128         b       3f
 129          sub    %i0,%o4,%i0     ! this kills msb of n
 130 4:      sub     %i0,%o4,%i0
 131 5:      addxcc  %i0,%i0,%i0
 132         bcc     2b
 133          subcc  %g1,1,%g1
 134 ! Got carry from n.  Subtract next step to cancel this carry.
 135         bne     4b
 136          addcc  %o1,%o1,%o1     ! shift n1n0 and a 0-bit in lsb
 137         sub     %i0,%o4,%i0
 138 3:      xnor    %o1,0,%o1
 139         b .LL86
 140         mov %o1,%l1
 141 .LL45:
 142         cmp %i2,%i0
 143         bleu .LL51
 144         sethi %hi(65535),%o0
 145         b .LL78
 146         mov 0,%o1
 147 .LL51:
 148         or %o0,%lo(65535),%o0
 149         cmp %i2,%o0
 150         bgu .LL58
 151         mov %i2,%o1
 152         cmp %i2,256
 153         addx %g0,-1,%o0
 154         b .LL64
 155         and %o0,8,%o2
 156 .LL58:
 157         sethi %hi(16777215),%o0
 158         or %o0,%lo(16777215),%o0
 159         cmp %i2,%o0
 160         bgu .LL64
 161         mov 24,%o2
 162         mov 16,%o2
 163 .LL64:
 164         srl %o1,%o2,%o0
 165         sethi %hi(__clz_tab),%o1
 166         or %o1,%lo(__clz_tab),%o1
 167         ldub [%o0+%o1],%o0
 168         add %o0,%o2,%o0
 169         mov 32,%o1
 170         subcc %o1,%o0,%o3
 171         bne,a .LL72
 172         sub %o1,%o3,%o1
 173         cmp %i0,%i2
 174         bgu .LL74
 175         cmp %i3,%o4
 176         blu .LL78
 177         mov 0,%o1
 178 .LL74:
 179         b .LL78
 180         mov 1,%o1
 181 .LL72:
 182         sll %i2,%o3,%o2
 183         srl %o4,%o1,%o0
 184         or %o2,%o0,%i2
 185         sll %o4,%o3,%o4
 186         srl %i0,%o1,%o2
 187         sll %i0,%o3,%o0
 188         srl %i3,%o1,%o1
 189         or %o0,%o1,%i0
 190         sll %i3,%o3,%i3
 191         mov %i0,%o1
 192         mov     32,%g1
 193         subcc   %o2,%i2,%g0
 194 1:      bcs     5f
 195          addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
 196         sub     %o2,%i2,%o2     ! this kills msb of n
 197         addx    %o2,%o2,%o2     ! so this cannot give carry
 198         subcc   %g1,1,%g1
 199 2:      bne     1b
 200          subcc  %o2,%i2,%g0
 201         bcs     3f
 202          addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
 203         b       3f
 204          sub    %o2,%i2,%o2     ! this kills msb of n
 205 4:      sub     %o2,%i2,%o2
 206 5:      addxcc  %o2,%o2,%o2
 207         bcc     2b
 208          subcc  %g1,1,%g1
 209 ! Got carry from n.  Subtract next step to cancel this carry.
 210         bne     4b
 211          addcc  %o1,%o1,%o1     ! shift n1n0 and a 0-bit in lsb
 212         sub     %o2,%i2,%o2
 213 3:      xnor    %o1,0,%o1
 214         mov %o2,%i0
 215         wr      %g0,%o1,%y      ! SPARC has 0-3 delay insn after a wr
 216         sra     %o4,31,%g2      ! Do not move this insn
 217         and     %o1,%g2,%g2     ! Do not move this insn
 218         andcc   %g0,0,%g1       ! Do not move this insn
 219         mulscc  %g1,%o4,%g1
 220         mulscc  %g1,%o4,%g1
 221         mulscc  %g1,%o4,%g1
 222         mulscc  %g1,%o4,%g1
 223         mulscc  %g1,%o4,%g1
 224         mulscc  %g1,%o4,%g1
 225         mulscc  %g1,%o4,%g1
 226         mulscc  %g1,%o4,%g1
 227         mulscc  %g1,%o4,%g1
 228         mulscc  %g1,%o4,%g1
 229         mulscc  %g1,%o4,%g1
 230         mulscc  %g1,%o4,%g1
 231         mulscc  %g1,%o4,%g1
 232         mulscc  %g1,%o4,%g1
 233         mulscc  %g1,%o4,%g1
 234         mulscc  %g1,%o4,%g1
 235         mulscc  %g1,%o4,%g1
 236         mulscc  %g1,%o4,%g1
 237         mulscc  %g1,%o4,%g1
 238         mulscc  %g1,%o4,%g1
 239         mulscc  %g1,%o4,%g1
 240         mulscc  %g1,%o4,%g1
 241         mulscc  %g1,%o4,%g1
 242         mulscc  %g1,%o4,%g1
 243         mulscc  %g1,%o4,%g1
 244         mulscc  %g1,%o4,%g1
 245         mulscc  %g1,%o4,%g1
 246         mulscc  %g1,%o4,%g1
 247         mulscc  %g1,%o4,%g1
 248         mulscc  %g1,%o4,%g1
 249         mulscc  %g1,%o4,%g1
 250         mulscc  %g1,%o4,%g1
 251         mulscc  %g1,0,%g1
 252         add     %g1,%g2,%o0
 253         rd      %y,%o2
 254         cmp %o0,%i0
 255         bgu,a .LL78
 256         add %o1,-1,%o1
 257         bne,a .LL50
 258         mov 0,%o2
 259         cmp %o2,%i3
 260         bleu .LL50
 261         mov 0,%o2
 262         add %o1,-1,%o1
 263 .LL78:
 264         mov 0,%o2
 265 .LL50:
 266         mov %o1,%l1
 267 .LL86:
 268         mov %o2,%l0
 269         mov %l0,%i0
 270         mov %l1,%i1
 271         cmp %l4,0
 272         be .LL81
 273         sub %g0,%i1,%o0
 274         mov %o0,%l3
 275         subcc %g0,%o0,%g0
 276         sub %g0,%i0,%o0
 277         subx %o0,0,%l2
 278         mov %l2,%i0
 279         mov %l3,%i1
 280 .LL81:
 281         ret
 282         restore
 283 EXPORT_SYMBOL(__divdi3)