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