Last change
on this file since 39a696b was 4f508e6, checked in by Thomas Lopatic <thomas@…>, 7 years ago |
Converted assembly language files.
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Property mode
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100644
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File size:
1.2 KB
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1 | | ------------------------------------------------------------------------------
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2 | | ldiv.s -- long division
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3 | | Version 1 -- 1988-01-22
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4 | | ------------------------------------------------------------------------------
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5 | .text
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6 |
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7 | .xdef _ldiv
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8 | .xdef ldiv
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9 |
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10 | .xdef _ldivr
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11 |
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12 | ARG1 = 8
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13 | ARG2 = 12
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14 |
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15 | _ldiv:
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16 | ldiv: link a6,#-2
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17 | movem.l d2-d7,-(a7)
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18 | clr.w d3
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19 | clr.l d5
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20 | move.l ARG1(a6),d7
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21 | move.l ARG2(a6),d6
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22 | bne ldiv1
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23 |
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24 | move.l #0x80000000,_ldivr
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25 | move.l #0x80000000,d0
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26 | divs #0,d0
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27 | bra ldiv11
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28 |
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29 | ldiv1: bge ldiv2
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30 |
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31 | neg.l d6
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32 | addq.w #1,d3
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33 |
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34 | ldiv2: tst.l d7
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35 | bge ldiv3
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36 |
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37 | neg.l d7
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38 | addq.w #1,d3
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39 |
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40 | ldiv3: cmp.l d7,d6
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41 | bgt ldiv9
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42 |
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43 | bne ldiv4
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44 |
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45 | moveq.l #1,d5
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46 | clr.l d7
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47 | bra ldiv9
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48 |
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49 | ldiv4: cmp.l #0x10000,d7
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50 | bge ldiv5
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51 |
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52 | divu d6,d7
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53 | move.w d7,d5
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54 | swap d7
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55 | ext.l d7
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56 | bra ldiv9
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57 |
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58 | ldiv5: moveq.l #1,d4
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59 |
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60 | ldiv6: cmp.l d6,d7
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61 | bcs ldiv7
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62 |
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63 | asl.l #1,d6
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64 | asl.l #1,d7
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65 | bra ldiv6
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66 |
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67 | ldiv7: tst.l d4
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68 | beq ldiv9
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69 |
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70 | cmp.l d6,d7
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71 | bcs ldiv8
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72 |
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73 | or.l d4,d5
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74 | sub.l d6,d7
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75 |
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76 | ldiv8: lsr.l #1,d4
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77 | lsr.l #1,d6
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78 | bra ldiv7
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79 |
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80 | ldiv9: cmp.w #1,d3
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81 | bne ldiv10
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82 |
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83 | neg.l d7
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84 | move.l d7,_ldivr
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85 | move.l d5,d0
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86 | neg.l d0
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87 | bra ldiv11
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88 |
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89 | ldiv10: move.l d7,_ldivr
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90 | move.l d5,d0
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91 |
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92 | ldiv11: tst.l (a7)+
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93 | movem.l (a7)+,d3-d7
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94 | unlk a6
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95 | rts
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96 |
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97 | .bss
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98 |
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99 | _ldivr: .ds.l 1
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100 |
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101 | .end
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