[45] | 1 | ; Project name : Assembly Library
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| 2 | ; Description : Sorting algorithms
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| 3 |
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[376] | 4 | ;
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[445] | 5 | ; XTIDE Universal BIOS and Associated Tools
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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[376] | 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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[445] | 12 | ;
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[376] | 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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[445] | 16 | ; GNU General Public License for more details.
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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[445] | 18 | ;
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[376] | 19 |
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[45] | 20 | ; Algorith is from http://www.algolist.net/Algorithms/Sorting/Quicksort
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| 21 |
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| 22 | struc QSORT_PARAMS
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[46] | 23 | .lpItems resb 4
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| 24 | .tempAndPivotItems:
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[45] | 25 | endstruc
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| 26 |
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| 27 | ;--------------------------------------------------------------------
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| 28 | ; Prototype for comparator callback function
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| 29 | ; Parameters:
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[46] | 30 | ; CX: Item size in bytes
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| 31 | ; DS:SI: Ptr to first item to compare
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| 32 | ; ES:DI: Ptr to second item to compare
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[45] | 33 | ; Returns:
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| 34 | ; FLAGS: Signed comparition between first and second item
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| 35 | ; Corrupts registers:
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| 36 | ; Nothing
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| 37 | ;--------------------------------------------------------------------
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| 38 |
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| 39 |
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| 40 | ; Section containing code
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| 41 | SECTION .text
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| 42 |
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| 43 | ;--------------------------------------------------------------------
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[46] | 44 | ; Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX
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[45] | 45 | ; Parameters:
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[46] | 46 | ; CX: Item size in bytes
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| 47 | ; DX: Number of items to sort (signed)
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| 48 | ; CS:BX: Comparator function
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| 49 | ; DS:SI: Ptr to array of items to sort
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[45] | 50 | ; Returns:
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| 51 | ; Nothing
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| 52 | ; Corrupts registers:
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| 53 | ; AX, CX, DX
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| 54 | ;--------------------------------------------------------------------
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| 55 | ALIGN JUMP_ALIGN
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| 56 | Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX:
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| 57 | push es
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| 58 | push di
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[46] | 59 | mov di, cx
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[445] | 60 | eSHL_IM cx, 1 ; Reserve temp and pivot items
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[45] | 61 | add cx, BYTE QSORT_PARAMS_size
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| 62 | eENTER_STRUCT cx
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[46] | 63 | push cx
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[45] | 64 |
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| 65 | cld
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[46] | 66 | mov cx, di ; Restore item size to CX
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| 67 | xor ax, ax ; Zero starting index
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[45] | 68 | dec dx ; Count to index of last item
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| 69 | mov [bp+QSORT_PARAMS.lpItems], si
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| 70 | mov [bp+QSORT_PARAMS.lpItems+2], ds
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| 71 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 72 |
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| 73 | lds si, [bp+QSORT_PARAMS.lpItems]
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[46] | 74 | pop ax
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| 75 | eLEAVE_STRUCT ax
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[45] | 76 | pop di
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| 77 | pop es
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| 78 | ret
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| 79 |
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| 80 |
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| 81 | ;--------------------------------------------------------------------
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| 82 | ; QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 83 | ; Parameters:
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| 84 | ; AX: Index of first item in range
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| 85 | ; BX: Comparator function
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| 86 | ; CX: Size of struct in bytes
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| 87 | ; DX: Index of last (included) item in range
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| 88 | ; SS:BP: Ptr to QSORT_PARAMS
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| 89 | ; Returns:
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| 90 | ; Nothing
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| 91 | ; Corrupts registers:
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| 92 | ; DS, ES
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| 93 | ; AX, DX (not for recursion)
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| 94 | ;--------------------------------------------------------------------
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| 95 | ALIGN JUMP_ALIGN
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| 96 | QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP:
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| 97 | push di
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| 98 | push si
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| 99 |
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| 100 | mov si, ax ; First index to SI
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| 101 | mov di, dx ; Last index to DI
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| 102 | call ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot
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| 103 |
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| 104 | ; Does left partition need more sorting
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| 105 | cmp si, dx ; if (first index < Index of rightmost unsorted item)
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[46] | 106 | jge SHORT .CheckIfRightPartitionNeedsMoreSorting
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[45] | 107 | xchg ax, si ; AX = first index, SI = Index of leftmost unsorted item
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| 108 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 109 | xchg ax, si ; AX = Index of leftmost unsorted item
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| 110 |
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| 111 | .CheckIfRightPartitionNeedsMoreSorting:
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| 112 | cmp ax, di ; if (Index of leftmost unsorted item < last index)
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[46] | 113 | jge SHORT .SortCompleted
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[45] | 114 | mov dx, di ; DI = Index of leftmost unsorted item
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| 115 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 116 |
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| 117 | ALIGN JUMP_ALIGN
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| 118 | .SortCompleted:
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| 119 | pop si
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| 120 | pop di
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| 121 | ret
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| 122 |
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| 123 |
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| 124 | ;--------------------------------------------------------------------
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| 125 | ; ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot
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| 126 | ; Parameters:
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| 127 | ; AX: Index of first item in range
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| 128 | ; BX: Comparator function
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| 129 | ; CX: Size of struct in bytes
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| 130 | ; DX: Index of last (included) item in range
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| 131 | ; SS:BP: Ptr to QSORT_PARAMS
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| 132 | ; Returns:
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| 133 | ; AX: Index of first unsorted item
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| 134 | ; DX: Index of last unsorted item
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| 135 | ; Corrupts registers:
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| 136 | ; DS, ES
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| 137 | ;--------------------------------------------------------------------
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| 138 | ALIGN JUMP_ALIGN
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| 139 | ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot:
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| 140 | push di
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| 141 | push si
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| 142 |
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| 143 | call .GetPivotPointerToESDI
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| 144 | call ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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| 145 |
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| 146 | pop si
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| 147 | pop di
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| 148 | ret
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| 149 |
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| 150 | ALIGN JUMP_ALIGN
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| 151 | .GetPivotPointerToESDI:
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| 152 | push ax
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[46] | 153 |
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[45] | 154 | add ax, dx
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[46] | 155 | shr ax, 1 ; AX = Middle index in partition
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[45] | 156 | call GetItemPointerToDSSIfromIndexInAX
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[46] | 157 | call GetPointerToTemporaryItemToESDI
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| 158 | add di, cx ; Pivot is after temporary item
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| 159 | call CopyItemFromDSSItoESDI
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| 160 | sub di, cx ; Restore DI
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| 161 |
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[45] | 162 | pop ax
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[46] | 163 | ret
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[45] | 164 |
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| 165 |
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| 166 | ;--------------------------------------------------------------------
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| 167 | ; ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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| 168 | ; Parameters:
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| 169 | ; AX: Index of first item in range
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| 170 | ; BX: Comparator function
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| 171 | ; CX: Size of struct in bytes
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| 172 | ; DX: Index of last (included) item in range
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| 173 | ; ES:DI: Ptr to Pivot item
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| 174 | ; SS:BP: Ptr to QSORT_PARAMS
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| 175 | ; Returns:
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| 176 | ; AX: Index of first unsorted item
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| 177 | ; DX: Index of last unsorted item
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| 178 | ; Corrupts registers:
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| 179 | ; SI, DS
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| 180 | ;--------------------------------------------------------------------
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| 181 | ALIGN JUMP_ALIGN
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| 182 | ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI:
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| 183 | cmp ax, dx ; while (left <= right)
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[46] | 184 | jg SHORT .BreakLoopSinceAllItemsExamined
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[45] | 185 |
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| 186 | call GetItemPointerToDSSIfromIndexInAX
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| 187 | call .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI
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| 188 |
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| 189 | call GetItemPointerToDSSIfromIndexInDX
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| 190 | call .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI
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| 191 |
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| 192 | cmp ax, dx ; If (left <= right)
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[46] | 193 | jg SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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[45] | 194 | call SwapItemsFromIndexesAXandDX
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| 195 | inc ax
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| 196 | dec dx
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| 197 | jmp SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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| 198 |
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| 199 | ALIGN JUMP_ALIGN
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| 200 | .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI:
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| 201 | call bx
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| 202 | jge SHORT .NoNeedToIncrementOrDecrementAnyMore
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| 203 | inc ax ; Increment item index
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| 204 | add si, cx ; Point to next struct
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| 205 | jmp SHORT .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI
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| 206 |
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| 207 | ALIGN JUMP_ALIGN
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| 208 | .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI:
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| 209 | call bx
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| 210 | jle SHORT .NoNeedToIncrementOrDecrementAnyMore
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| 211 | dec dx
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| 212 | sub si, cx
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| 213 | jmp SHORT .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI
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| 214 |
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| 215 | ALIGN JUMP_ALIGN
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| 216 | .NoNeedToIncrementOrDecrementAnyMore:
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| 217 | .BreakLoopSinceAllItemsExamined:
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| 218 | ret
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| 219 |
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| 220 |
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| 221 | ;--------------------------------------------------------------------
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| 222 | ; SwapItemsFromIndexesAXandDX
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| 223 | ; Parameters:
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| 224 | ; AX: Index of item 1
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| 225 | ; CX: Size of struct in bytes
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| 226 | ; DX: Index of item 2
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| 227 | ; SS:BP: Ptr to QSORT_PARAMS
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| 228 | ; Returns:
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| 229 | ; Nothing
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| 230 | ; Corrupts registers:
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| 231 | ; SI, DS
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| 232 | ;--------------------------------------------------------------------
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| 233 | ALIGN JUMP_ALIGN
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| 234 | SwapItemsFromIndexesAXandDX:
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| 235 | push es
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| 236 | push di
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| 237 |
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| 238 | ; Item AX to stack
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[46] | 239 | call GetPointerToTemporaryItemToESDI
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[45] | 240 | call GetItemPointerToDSSIfromIndexInAX
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[46] | 241 | call CopyItemFromDSSItoESDI
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[45] | 242 |
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| 243 | ; Item DX to Item AX
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[54] | 244 | call Registers_ExchangeDSSIwithESDI
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[45] | 245 | call GetItemPointerToDSSIfromIndexInDX
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[46] | 246 | call CopyItemFromDSSItoESDI
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[45] | 247 |
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| 248 | ; Stack to Item DX
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[46] | 249 | call GetPointerToTemporaryItemToESDI
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[54] | 250 | call Registers_ExchangeDSSIwithESDI
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[46] | 251 | call CopyItemFromDSSItoESDI
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[45] | 252 |
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| 253 | pop di
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| 254 | pop es
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| 255 | ret
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| 256 |
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[46] | 257 |
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| 258 | ;--------------------------------------------------------------------
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| 259 | ; GetPointerToTemporaryItemToESDI
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| 260 | ; Parameters:
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| 261 | ; SS:BP: Ptr to QSORT_PARAMS
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| 262 | ; Returns:
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| 263 | ; ES:DI: Ptr to temporary item
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| 264 | ; Corrupts registers:
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| 265 | ; Nothing
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| 266 | ;--------------------------------------------------------------------
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[45] | 267 | ALIGN JUMP_ALIGN
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[46] | 268 | GetPointerToTemporaryItemToESDI:
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| 269 | lea di, [bp+QSORT_PARAMS.tempAndPivotItems]
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[45] | 270 | push ss
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| 271 | pop es
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| 272 | ret
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| 273 |
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| 274 |
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| 275 | ;--------------------------------------------------------------------
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| 276 | ; GetItemPointerToDSSIfromIndexInDX
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| 277 | ; GetItemPointerToDSSIfromIndexInAX
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| 278 | ; Parameters:
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| 279 | ; AX or DX: Item index
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| 280 | ; CX: Size of struct in bytes
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| 281 | ; SS:BP: Ptr to QSORT_PARAMS
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| 282 | ; Returns:
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| 283 | ; DS:SI: Ptr to item
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| 284 | ; Corrupts registers:
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| 285 | ; Nothing
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| 286 | ;--------------------------------------------------------------------
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| 287 | ALIGN JUMP_ALIGN
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| 288 | GetItemPointerToDSSIfromIndexInDX:
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| 289 | xchg ax, dx
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| 290 | call GetItemPointerToDSSIfromIndexInAX
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| 291 | xchg dx, ax
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| 292 | ret
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| 293 |
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| 294 | ALIGN JUMP_ALIGN
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| 295 | GetItemPointerToDSSIfromIndexInAX:
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| 296 | push dx
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| 297 | push ax
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| 298 |
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| 299 | mul cx ; DX:AX = index (AX) * size of struct (CX)
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| 300 | lds si, [bp+QSORT_PARAMS.lpItems]
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| 301 | add si, ax
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| 302 |
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| 303 | pop ax
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| 304 | pop dx
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| 305 | ret
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[46] | 306 |
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| 307 |
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| 308 | ;--------------------------------------------------------------------
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| 309 | ; CopyItemFromDSSItoESDI
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| 310 | ; Parameters:
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| 311 | ; CX: Item size in bytes
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| 312 | ; DS:SI: Ptr to source item
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| 313 | ; ES:DI: Ptr to destination buffer
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| 314 | ; Returns:
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| 315 | ; Nothing
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| 316 | ; Corrupts registers:
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| 317 | ; DI
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| 318 | ;--------------------------------------------------------------------
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| 319 | ALIGN JUMP_ALIGN
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| 320 | CopyItemFromDSSItoESDI:
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| 321 | call Memory_CopyCXbytesFromDSSItoESDI
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| 322 | sub si, cx ; Restore SI
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| 323 | ret
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