div.s

   1 ; ARM software division implementation
   2 ; These functions are assembled using neatas and are included in gen.c
   3 .global __udivdi3
   4 __udivdi3:
   5         mov     r2, #0
   6         mov     r3, #0
   7
   8         @ zero divider
   9         tst     r1, r1
  10         beq     .end
  11
  12         @ shift the operand
  13 .shl:
  14         movs    r12, r1, LSL r2
  15         add     r2, r2, #1
  16         bpl     .shl
  17
  18         mov     r12, #1
  19
  20         @ the main division algorithm
  21 .shr:
  22         subs    r2, r2, #1
  23         bmi     .end
  24         cmps    r0, r1, LSL r2
  25         bcc     .shr
  26         sub     r0, r0, r1, LSL r2
  27         add     r3, r3, r12, LSL r2
  28         b       .shr
  29 .end:
  30         mov     r1, r0
  31         mov     r0, r3
  32         mov     pc, lr
  33
  34 .global __umoddi3
  35 __umoddi3:
  36         stmfd   sp!, {lr}
  37         bl      __udivdi3
  38         mov     r0, r1
  39         ldmfd   sp!, {pc}
  40
  41 .global __divdi3
  42 __divdi3:
  43         stmfd   sp!, {r4, lr}
  44
  45         tst     r0, r0
  46         rsbmi   r0, r0, #0
  47         movmi   r4, #1
  48
  49         tst     r1, r1
  50         rsbmi   r0, r0, #0
  51         submi   r4, r4, #1
  52
  53         bl      __udivdi3
  54         tst     r4, r4
  55         subne   r0, r0, #0
  56
  57         ldmfd   sp!, {r4, pc}
  58
  59 .global __moddi3
  60 __moddi3:
  61         stmfd   sp!, {lr}
  62         bl      __divdi3
  63         mov     r0, r1
  64         ldmfd   sp!, {pc}