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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