1 | ; File name : Sort.asm |
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2 | ; Project name : Assembly Library |
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3 | ; Created date : 28.9.2010 |
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4 | ; Last update : 29.9.2010 |
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5 | ; Author : Tomi Tilli |
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6 | ; Description : Sorting algorithms |
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7 | |
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8 | ; Algorith is from http://www.algolist.net/Algorithms/Sorting/Quicksort |
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9 | |
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10 | struc QSORT_PARAMS |
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11 | .lpItems resb 4 |
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12 | .tempStruct: |
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13 | endstruc |
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14 | |
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15 | ;-------------------------------------------------------------------- |
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16 | ; Prototype for comparator callback function |
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17 | ; Parameters: |
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18 | ; DS:SI: Offset to first item to compare |
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19 | ; ES:DI: Offset to second item to compare |
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20 | ; Returns: |
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21 | ; FLAGS: Signed comparition between first and second item |
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22 | ; Corrupts registers: |
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23 | ; Nothing |
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24 | ;-------------------------------------------------------------------- |
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25 | |
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26 | |
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27 | ; Section containing code |
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28 | SECTION .text |
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29 | |
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30 | ;-------------------------------------------------------------------- |
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31 | ; DialogFile_GetFileNameWithIoInDSSI |
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32 | ; Parameters: |
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33 | ; DS:SI: Ptr to FILE_DIALOG_IO |
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34 | ; SS:BP: Ptr to parent MENU |
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35 | ; Returns: |
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36 | ; Nothing |
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37 | ; Corrupts registers: |
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38 | ; AX, CX, DX |
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39 | ;-------------------------------------------------------------------- |
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40 | ALIGN JUMP_ALIGN |
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41 | Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX: |
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42 | push es |
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43 | push di |
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44 | add cx, BYTE QSORT_PARAMS_size |
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45 | eENTER_STRUCT cx |
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46 | |
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47 | cld |
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48 | sub cx, BYTE QSORT_PARAMS_size ; Restore CX to item size |
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49 | xor ax, ax ; Zero for starting index |
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50 | dec dx ; Count to index of last item |
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51 | mov [bp+QSORT_PARAMS.lpItems], si |
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52 | mov [bp+QSORT_PARAMS.lpItems+2], ds |
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53 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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54 | |
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55 | lds si, [bp+QSORT_PARAMS.lpItems] |
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56 | add cx, BYTE QSORT_PARAMS_size |
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57 | eLEAVE_STRUCT cx |
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58 | pop di |
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59 | pop es |
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60 | ret |
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61 | |
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62 | |
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63 | ;-------------------------------------------------------------------- |
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64 | ; QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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65 | ; Parameters: |
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66 | ; AX: Index of first item in range |
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67 | ; BX: Comparator function |
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68 | ; CX: Size of struct in bytes |
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69 | ; DX: Index of last (included) item in range |
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70 | ; SS:BP: Ptr to QSORT_PARAMS |
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71 | ; Returns: |
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72 | ; Nothing |
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73 | ; Corrupts registers: |
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74 | ; DS, ES |
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75 | ; AX, DX (not for recursion) |
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76 | ;-------------------------------------------------------------------- |
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77 | ALIGN JUMP_ALIGN |
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78 | QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP: |
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79 | push di |
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80 | push si |
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81 | |
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82 | mov si, ax ; First index to SI |
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83 | mov di, dx ; Last index to DI |
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84 | call ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot |
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85 | |
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86 | ; Does left partition need more sorting |
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87 | cmp si, dx ; if (first index < Index of rightmost unsorted item) |
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88 | jae SHORT .CheckIfRightPartitionNeedsMoreSorting |
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89 | xchg ax, si ; AX = first index, SI = Index of leftmost unsorted item |
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90 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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91 | xchg ax, si ; AX = Index of leftmost unsorted item |
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92 | |
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93 | .CheckIfRightPartitionNeedsMoreSorting: |
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94 | cmp ax, di ; if (Index of leftmost unsorted item < last index) |
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95 | jae SHORT .SortCompleted |
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96 | mov dx, di ; DI = Index of leftmost unsorted item |
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97 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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98 | |
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99 | ALIGN JUMP_ALIGN |
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100 | .SortCompleted: |
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101 | pop si |
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102 | pop di |
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103 | ret |
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104 | |
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105 | |
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106 | ;-------------------------------------------------------------------- |
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107 | ; ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot |
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108 | ; Parameters: |
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109 | ; AX: Index of first item in range |
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110 | ; BX: Comparator function |
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111 | ; CX: Size of struct in bytes |
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112 | ; DX: Index of last (included) item in range |
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113 | ; SS:BP: Ptr to QSORT_PARAMS |
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114 | ; Returns: |
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115 | ; AX: Index of first unsorted item |
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116 | ; DX: Index of last unsorted item |
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117 | ; Corrupts registers: |
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118 | ; DS, ES |
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119 | ;-------------------------------------------------------------------- |
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120 | ALIGN JUMP_ALIGN |
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121 | ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot: |
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122 | push di |
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123 | push si |
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124 | |
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125 | call .GetPivotPointerToESDI |
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126 | call ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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127 | |
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128 | pop si |
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129 | pop di |
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130 | ret |
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131 | |
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132 | ALIGN JUMP_ALIGN |
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133 | .GetPivotPointerToESDI: |
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134 | push ax |
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135 | add ax, dx |
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136 | shr ax, 1 |
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137 | call GetItemPointerToDSSIfromIndexInAX |
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138 | pop ax |
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139 | jmp Memory_ExchangeDSSIwithESDI |
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140 | |
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141 | |
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142 | ;-------------------------------------------------------------------- |
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143 | ; ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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144 | ; Parameters: |
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145 | ; AX: Index of first item in range |
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146 | ; BX: Comparator function |
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147 | ; CX: Size of struct in bytes |
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148 | ; DX: Index of last (included) item in range |
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149 | ; ES:DI: Ptr to Pivot item |
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150 | ; SS:BP: Ptr to QSORT_PARAMS |
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151 | ; Returns: |
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152 | ; AX: Index of first unsorted item |
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153 | ; DX: Index of last unsorted item |
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154 | ; Corrupts registers: |
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155 | ; SI, DS |
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156 | ;-------------------------------------------------------------------- |
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157 | ALIGN JUMP_ALIGN |
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158 | ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI: |
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159 | cmp ax, dx ; while (left <= right) |
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160 | ja SHORT .BreakLoopSinceAllItemsExamined |
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161 | |
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162 | call GetItemPointerToDSSIfromIndexInAX |
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163 | call .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI |
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164 | |
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165 | call GetItemPointerToDSSIfromIndexInDX |
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166 | call .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI |
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167 | |
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168 | cmp ax, dx ; If (left <= right) |
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169 | ja SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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170 | call SwapItemsFromIndexesAXandDX |
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171 | inc ax |
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172 | dec dx |
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173 | jmp SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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174 | |
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175 | ALIGN JUMP_ALIGN |
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176 | .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI: |
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177 | call bx |
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178 | jge SHORT .NoNeedToIncrementOrDecrementAnyMore |
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179 | inc ax ; Increment item index |
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180 | add si, cx ; Point to next struct |
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181 | jmp SHORT .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI |
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182 | |
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183 | ALIGN JUMP_ALIGN |
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184 | .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI: |
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185 | call bx |
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186 | jle SHORT .NoNeedToIncrementOrDecrementAnyMore |
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187 | dec dx |
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188 | sub si, cx |
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189 | jmp SHORT .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI |
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190 | |
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191 | ALIGN JUMP_ALIGN |
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192 | .NoNeedToIncrementOrDecrementAnyMore: |
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193 | .BreakLoopSinceAllItemsExamined: |
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194 | ret |
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195 | |
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196 | |
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197 | ;-------------------------------------------------------------------- |
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198 | ; SwapItemsFromIndexesAXandDX |
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199 | ; Parameters: |
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200 | ; AX: Index of item 1 |
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201 | ; CX: Size of struct in bytes |
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202 | ; DX: Index of item 2 |
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203 | ; SS:BP: Ptr to QSORT_PARAMS |
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204 | ; Returns: |
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205 | ; Nothing |
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206 | ; Corrupts registers: |
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207 | ; SI, DS |
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208 | ;-------------------------------------------------------------------- |
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209 | ALIGN JUMP_ALIGN |
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210 | SwapItemsFromIndexesAXandDX: |
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211 | push es |
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212 | push di |
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213 | |
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214 | ; Item AX to stack |
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215 | call .GetPtrToTemporaryStructToESDI |
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216 | call GetItemPointerToDSSIfromIndexInAX |
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217 | call .CopyItemFromDSSItoESDI |
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218 | |
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219 | ; Item DX to Item AX |
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220 | call Memory_ExchangeDSSIwithESDI |
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221 | call GetItemPointerToDSSIfromIndexInDX |
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222 | call .CopyItemFromDSSItoESDI |
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223 | |
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224 | ; Stack to Item DX |
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225 | call .GetPtrToTemporaryStructToESDI |
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226 | call Memory_ExchangeDSSIwithESDI |
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227 | call .CopyItemFromDSSItoESDI |
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228 | |
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229 | pop di |
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230 | pop es |
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231 | ret |
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232 | |
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233 | ALIGN JUMP_ALIGN |
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234 | .GetPtrToTemporaryStructToESDI: |
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235 | lea di, [bp+QSORT_PARAMS.tempStruct] |
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236 | push ss |
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237 | pop es |
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238 | ret |
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239 | |
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240 | ALIGN JUMP_ALIGN |
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241 | .CopyItemFromDSSItoESDI: |
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242 | push si |
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243 | push cx |
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244 | |
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245 | shr cx, 1 ; We want to copy WORDs for performance |
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246 | jcxz .CopyLastByte |
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247 | rep movsw |
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248 | .CopyLastByte: |
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249 | jnc SHORT .CopyComplete |
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250 | movsb |
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251 | .CopyComplete: |
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252 | pop cx |
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253 | pop si |
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254 | ret |
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255 | |
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256 | |
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257 | ;-------------------------------------------------------------------- |
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258 | ; GetItemPointerToDSSIfromIndexInDX |
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259 | ; GetItemPointerToDSSIfromIndexInAX |
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260 | ; Parameters: |
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261 | ; AX or DX: Item index |
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262 | ; CX: Size of struct in bytes |
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263 | ; SS:BP: Ptr to QSORT_PARAMS |
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264 | ; Returns: |
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265 | ; DS:SI: Ptr to item |
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266 | ; Corrupts registers: |
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267 | ; Nothing |
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268 | ;-------------------------------------------------------------------- |
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269 | ALIGN JUMP_ALIGN |
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270 | GetItemPointerToDSSIfromIndexInDX: |
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271 | xchg ax, dx |
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272 | call GetItemPointerToDSSIfromIndexInAX |
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273 | xchg dx, ax |
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274 | ret |
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275 | |
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276 | ALIGN JUMP_ALIGN |
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277 | GetItemPointerToDSSIfromIndexInAX: |
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278 | push dx |
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279 | push ax |
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280 | |
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281 | mul cx ; DX:AX = index (AX) * size of struct (CX) |
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282 | lds si, [bp+QSORT_PARAMS.lpItems] |
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283 | add si, ax |
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284 | |
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285 | pop ax |
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286 | pop dx |
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287 | ret |
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