[45] | 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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[54] | 4 | ; Last update : 24.10.2010 |
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[45] | 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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[46] | 11 | .lpItems resb 4 |
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| 12 | .tempAndPivotItems: |
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[45] | 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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[46] | 18 | ; CX: Item size in bytes |
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| 19 | ; DS:SI: Ptr to first item to compare |
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| 20 | ; ES:DI: Ptr to second item to compare |
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[45] | 21 | ; Returns: |
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| 22 | ; FLAGS: Signed comparition between first and second item |
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| 23 | ; Corrupts registers: |
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| 24 | ; Nothing |
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| 25 | ;-------------------------------------------------------------------- |
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| 26 | |
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| 27 | |
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| 28 | ; Section containing code |
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| 29 | SECTION .text |
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| 30 | |
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| 31 | ;-------------------------------------------------------------------- |
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[46] | 32 | ; Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX |
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[45] | 33 | ; Parameters: |
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[46] | 34 | ; CX: Item size in bytes |
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| 35 | ; DX: Number of items to sort (signed) |
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| 36 | ; CS:BX: Comparator function |
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| 37 | ; DS:SI: Ptr to array of items to sort |
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[45] | 38 | ; Returns: |
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| 39 | ; Nothing |
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| 40 | ; Corrupts registers: |
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| 41 | ; AX, CX, DX |
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| 42 | ;-------------------------------------------------------------------- |
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| 43 | ALIGN JUMP_ALIGN |
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| 44 | Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX: |
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| 45 | push es |
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| 46 | push di |
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[46] | 47 | mov di, cx |
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| 48 | shl cx, 1 ; Reserve temp and pivot items |
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[45] | 49 | add cx, BYTE QSORT_PARAMS_size |
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| 50 | eENTER_STRUCT cx |
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[46] | 51 | push cx |
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[45] | 52 | |
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| 53 | cld |
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[46] | 54 | mov cx, di ; Restore item size to CX |
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| 55 | xor ax, ax ; Zero starting index |
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[45] | 56 | dec dx ; Count to index of last item |
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| 57 | mov [bp+QSORT_PARAMS.lpItems], si |
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| 58 | mov [bp+QSORT_PARAMS.lpItems+2], ds |
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| 59 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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| 60 | |
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| 61 | lds si, [bp+QSORT_PARAMS.lpItems] |
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[46] | 62 | pop ax |
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| 63 | eLEAVE_STRUCT ax |
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[45] | 64 | pop di |
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| 65 | pop es |
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| 66 | ret |
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| 67 | |
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| 68 | |
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| 69 | ;-------------------------------------------------------------------- |
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| 70 | ; QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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| 71 | ; Parameters: |
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| 72 | ; AX: Index of first item in range |
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| 73 | ; BX: Comparator function |
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| 74 | ; CX: Size of struct in bytes |
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| 75 | ; DX: Index of last (included) item in range |
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| 76 | ; SS:BP: Ptr to QSORT_PARAMS |
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| 77 | ; Returns: |
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| 78 | ; Nothing |
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| 79 | ; Corrupts registers: |
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| 80 | ; DS, ES |
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| 81 | ; AX, DX (not for recursion) |
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| 82 | ;-------------------------------------------------------------------- |
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| 83 | ALIGN JUMP_ALIGN |
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| 84 | QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP: |
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| 85 | push di |
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| 86 | push si |
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| 87 | |
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| 88 | mov si, ax ; First index to SI |
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| 89 | mov di, dx ; Last index to DI |
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| 90 | call ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot |
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| 91 | |
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| 92 | ; Does left partition need more sorting |
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| 93 | cmp si, dx ; if (first index < Index of rightmost unsorted item) |
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[46] | 94 | jge SHORT .CheckIfRightPartitionNeedsMoreSorting |
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[45] | 95 | xchg ax, si ; AX = first index, SI = Index of leftmost unsorted item |
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| 96 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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| 97 | xchg ax, si ; AX = Index of leftmost unsorted item |
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| 98 | |
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| 99 | .CheckIfRightPartitionNeedsMoreSorting: |
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| 100 | cmp ax, di ; if (Index of leftmost unsorted item < last index) |
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[46] | 101 | jge SHORT .SortCompleted |
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[45] | 102 | mov dx, di ; DI = Index of leftmost unsorted item |
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| 103 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP |
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| 104 | |
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| 105 | ALIGN JUMP_ALIGN |
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| 106 | .SortCompleted: |
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| 107 | pop si |
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| 108 | pop di |
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| 109 | ret |
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| 110 | |
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| 111 | |
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| 112 | ;-------------------------------------------------------------------- |
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| 113 | ; ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot |
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| 114 | ; Parameters: |
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| 115 | ; AX: Index of first item in range |
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| 116 | ; BX: Comparator function |
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| 117 | ; CX: Size of struct in bytes |
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| 118 | ; DX: Index of last (included) item in range |
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| 119 | ; SS:BP: Ptr to QSORT_PARAMS |
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| 120 | ; Returns: |
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| 121 | ; AX: Index of first unsorted item |
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| 122 | ; DX: Index of last unsorted item |
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| 123 | ; Corrupts registers: |
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| 124 | ; DS, ES |
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| 125 | ;-------------------------------------------------------------------- |
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| 126 | ALIGN JUMP_ALIGN |
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| 127 | ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot: |
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| 128 | push di |
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| 129 | push si |
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| 130 | |
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| 131 | call .GetPivotPointerToESDI |
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| 132 | call ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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| 133 | |
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| 134 | pop si |
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| 135 | pop di |
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| 136 | ret |
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| 137 | |
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| 138 | ALIGN JUMP_ALIGN |
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| 139 | .GetPivotPointerToESDI: |
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| 140 | push ax |
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[46] | 141 | |
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[45] | 142 | add ax, dx |
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[46] | 143 | shr ax, 1 ; AX = Middle index in partition |
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[45] | 144 | call GetItemPointerToDSSIfromIndexInAX |
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[46] | 145 | call GetPointerToTemporaryItemToESDI |
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| 146 | add di, cx ; Pivot is after temporary item |
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| 147 | call CopyItemFromDSSItoESDI |
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| 148 | sub di, cx ; Restore DI |
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| 149 | |
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[45] | 150 | pop ax |
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[46] | 151 | ret |
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[45] | 152 | |
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| 153 | |
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| 154 | ;-------------------------------------------------------------------- |
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| 155 | ; ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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| 156 | ; Parameters: |
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| 157 | ; AX: Index of first item in range |
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| 158 | ; BX: Comparator function |
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| 159 | ; CX: Size of struct in bytes |
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| 160 | ; DX: Index of last (included) item in range |
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| 161 | ; ES:DI: Ptr to Pivot item |
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| 162 | ; SS:BP: Ptr to QSORT_PARAMS |
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| 163 | ; Returns: |
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| 164 | ; AX: Index of first unsorted item |
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| 165 | ; DX: Index of last unsorted item |
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| 166 | ; Corrupts registers: |
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| 167 | ; SI, DS |
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| 168 | ;-------------------------------------------------------------------- |
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| 169 | ALIGN JUMP_ALIGN |
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| 170 | ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI: |
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| 171 | cmp ax, dx ; while (left <= right) |
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[46] | 172 | jg SHORT .BreakLoopSinceAllItemsExamined |
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[45] | 173 | |
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| 174 | call GetItemPointerToDSSIfromIndexInAX |
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| 175 | call .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI |
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| 176 | |
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| 177 | call GetItemPointerToDSSIfromIndexInDX |
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| 178 | call .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI |
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| 179 | |
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| 180 | cmp ax, dx ; If (left <= right) |
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[46] | 181 | jg SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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[45] | 182 | call SwapItemsFromIndexesAXandDX |
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| 183 | inc ax |
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| 184 | dec dx |
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| 185 | jmp SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI |
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| 186 | |
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| 187 | ALIGN JUMP_ALIGN |
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| 188 | .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI: |
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| 189 | call bx |
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| 190 | jge SHORT .NoNeedToIncrementOrDecrementAnyMore |
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| 191 | inc ax ; Increment item index |
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| 192 | add si, cx ; Point to next struct |
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| 193 | jmp SHORT .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI |
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| 194 | |
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| 195 | ALIGN JUMP_ALIGN |
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| 196 | .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI: |
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| 197 | call bx |
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| 198 | jle SHORT .NoNeedToIncrementOrDecrementAnyMore |
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| 199 | dec dx |
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| 200 | sub si, cx |
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| 201 | jmp SHORT .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI |
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| 202 | |
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| 203 | ALIGN JUMP_ALIGN |
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| 204 | .NoNeedToIncrementOrDecrementAnyMore: |
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| 205 | .BreakLoopSinceAllItemsExamined: |
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| 206 | ret |
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| 207 | |
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| 208 | |
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| 209 | ;-------------------------------------------------------------------- |
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| 210 | ; SwapItemsFromIndexesAXandDX |
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| 211 | ; Parameters: |
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| 212 | ; AX: Index of item 1 |
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| 213 | ; CX: Size of struct in bytes |
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| 214 | ; DX: Index of item 2 |
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| 215 | ; SS:BP: Ptr to QSORT_PARAMS |
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| 216 | ; Returns: |
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| 217 | ; Nothing |
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| 218 | ; Corrupts registers: |
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| 219 | ; SI, DS |
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| 220 | ;-------------------------------------------------------------------- |
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| 221 | ALIGN JUMP_ALIGN |
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| 222 | SwapItemsFromIndexesAXandDX: |
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| 223 | push es |
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| 224 | push di |
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| 225 | |
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| 226 | ; Item AX to stack |
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[46] | 227 | call GetPointerToTemporaryItemToESDI |
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[45] | 228 | call GetItemPointerToDSSIfromIndexInAX |
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[46] | 229 | call CopyItemFromDSSItoESDI |
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[45] | 230 | |
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| 231 | ; Item DX to Item AX |
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[54] | 232 | call Registers_ExchangeDSSIwithESDI |
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[45] | 233 | call GetItemPointerToDSSIfromIndexInDX |
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[46] | 234 | call CopyItemFromDSSItoESDI |
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[45] | 235 | |
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| 236 | ; Stack to Item DX |
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[46] | 237 | call GetPointerToTemporaryItemToESDI |
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[54] | 238 | call Registers_ExchangeDSSIwithESDI |
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[46] | 239 | call CopyItemFromDSSItoESDI |
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[45] | 240 | |
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| 241 | pop di |
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| 242 | pop es |
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| 243 | ret |
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| 244 | |
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[46] | 245 | |
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| 246 | ;-------------------------------------------------------------------- |
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| 247 | ; GetPointerToTemporaryItemToESDI |
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| 248 | ; Parameters: |
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| 249 | ; SS:BP: Ptr to QSORT_PARAMS |
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| 250 | ; Returns: |
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| 251 | ; ES:DI: Ptr to temporary item |
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| 252 | ; Corrupts registers: |
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| 253 | ; Nothing |
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| 254 | ;-------------------------------------------------------------------- |
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[45] | 255 | ALIGN JUMP_ALIGN |
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[46] | 256 | GetPointerToTemporaryItemToESDI: |
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| 257 | lea di, [bp+QSORT_PARAMS.tempAndPivotItems] |
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[45] | 258 | push ss |
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| 259 | pop es |
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| 260 | ret |
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| 261 | |
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| 262 | |
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| 263 | ;-------------------------------------------------------------------- |
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| 264 | ; GetItemPointerToDSSIfromIndexInDX |
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| 265 | ; GetItemPointerToDSSIfromIndexInAX |
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| 266 | ; Parameters: |
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| 267 | ; AX or DX: Item index |
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| 268 | ; CX: Size of struct in bytes |
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| 269 | ; SS:BP: Ptr to QSORT_PARAMS |
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| 270 | ; Returns: |
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| 271 | ; DS:SI: Ptr to item |
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| 272 | ; Corrupts registers: |
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| 273 | ; Nothing |
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| 274 | ;-------------------------------------------------------------------- |
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| 275 | ALIGN JUMP_ALIGN |
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| 276 | GetItemPointerToDSSIfromIndexInDX: |
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| 277 | xchg ax, dx |
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| 278 | call GetItemPointerToDSSIfromIndexInAX |
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| 279 | xchg dx, ax |
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| 280 | ret |
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| 281 | |
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| 282 | ALIGN JUMP_ALIGN |
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| 283 | GetItemPointerToDSSIfromIndexInAX: |
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| 284 | push dx |
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| 285 | push ax |
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| 286 | |
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| 287 | mul cx ; DX:AX = index (AX) * size of struct (CX) |
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| 288 | lds si, [bp+QSORT_PARAMS.lpItems] |
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| 289 | add si, ax |
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| 290 | |
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| 291 | pop ax |
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| 292 | pop dx |
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| 293 | ret |
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[46] | 294 | |
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| 295 | |
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| 296 | ;-------------------------------------------------------------------- |
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| 297 | ; CopyItemFromDSSItoESDI |
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| 298 | ; Parameters: |
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| 299 | ; CX: Item size in bytes |
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| 300 | ; DS:SI: Ptr to source item |
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| 301 | ; ES:DI: Ptr to destination buffer |
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| 302 | ; Returns: |
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| 303 | ; Nothing |
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| 304 | ; Corrupts registers: |
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| 305 | ; DI |
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| 306 | ;-------------------------------------------------------------------- |
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| 307 | ALIGN JUMP_ALIGN |
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| 308 | CopyItemFromDSSItoESDI: |
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| 309 | call Memory_CopyCXbytesFromDSSItoESDI |
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| 310 | sub si, cx ; Restore SI |
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| 311 | ret |
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