[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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[376] | 8 | ;
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| 9 | ; XTIDE Universal BIOS and Associated Tools
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| 10 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or modify
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| 13 | ; it under the terms of the GNU General Public License as published by
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| 14 | ; the Free Software Foundation; either version 2 of the License, or
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| 15 | ; (at your option) any later version.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful,
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| 18 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | ; GNU General Public License for more details.
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| 21 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 22 | ;
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| 23 |
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[45] | 24 | ; Algorith is from http://www.algolist.net/Algorithms/Sorting/Quicksort
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| 25 |
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| 26 | struc QSORT_PARAMS
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[46] | 27 | .lpItems resb 4
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| 28 | .tempAndPivotItems:
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[45] | 29 | endstruc
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| 30 |
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| 31 | ;--------------------------------------------------------------------
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| 32 | ; Prototype for comparator callback function
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| 33 | ; Parameters:
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[46] | 34 | ; CX: Item size in bytes
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| 35 | ; DS:SI: Ptr to first item to compare
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| 36 | ; ES:DI: Ptr to second item to compare
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[45] | 37 | ; Returns:
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| 38 | ; FLAGS: Signed comparition between first and second item
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| 39 | ; Corrupts registers:
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| 40 | ; Nothing
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| 41 | ;--------------------------------------------------------------------
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| 42 |
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| 43 |
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| 44 | ; Section containing code
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| 45 | SECTION .text
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| 46 |
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| 47 | ;--------------------------------------------------------------------
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[46] | 48 | ; Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX
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[45] | 49 | ; Parameters:
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[46] | 50 | ; CX: Item size in bytes
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| 51 | ; DX: Number of items to sort (signed)
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| 52 | ; CS:BX: Comparator function
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| 53 | ; DS:SI: Ptr to array of items to sort
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[45] | 54 | ; Returns:
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| 55 | ; Nothing
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| 56 | ; Corrupts registers:
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| 57 | ; AX, CX, DX
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| 58 | ;--------------------------------------------------------------------
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| 59 | ALIGN JUMP_ALIGN
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| 60 | Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX:
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| 61 | push es
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| 62 | push di
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[46] | 63 | mov di, cx
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| 64 | shl cx, 1 ; Reserve temp and pivot items
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[45] | 65 | add cx, BYTE QSORT_PARAMS_size
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| 66 | eENTER_STRUCT cx
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[46] | 67 | push cx
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[45] | 68 |
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| 69 | cld
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[46] | 70 | mov cx, di ; Restore item size to CX
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| 71 | xor ax, ax ; Zero starting index
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[45] | 72 | dec dx ; Count to index of last item
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| 73 | mov [bp+QSORT_PARAMS.lpItems], si
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| 74 | mov [bp+QSORT_PARAMS.lpItems+2], ds
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| 75 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 76 |
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| 77 | lds si, [bp+QSORT_PARAMS.lpItems]
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[46] | 78 | pop ax
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| 79 | eLEAVE_STRUCT ax
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[45] | 80 | pop di
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| 81 | pop es
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| 82 | ret
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| 83 |
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| 84 |
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| 85 | ;--------------------------------------------------------------------
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| 86 | ; QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 87 | ; Parameters:
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| 88 | ; AX: Index of first item in range
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| 89 | ; BX: Comparator function
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| 90 | ; CX: Size of struct in bytes
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| 91 | ; DX: Index of last (included) item in range
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| 92 | ; SS:BP: Ptr to QSORT_PARAMS
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| 93 | ; Returns:
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| 94 | ; Nothing
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| 95 | ; Corrupts registers:
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| 96 | ; DS, ES
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| 97 | ; AX, DX (not for recursion)
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| 98 | ;--------------------------------------------------------------------
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| 99 | ALIGN JUMP_ALIGN
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| 100 | QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP:
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| 101 | push di
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| 102 | push si
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| 103 |
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| 104 | mov si, ax ; First index to SI
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| 105 | mov di, dx ; Last index to DI
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| 106 | call ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot
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| 107 |
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| 108 | ; Does left partition need more sorting
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| 109 | cmp si, dx ; if (first index < Index of rightmost unsorted item)
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[46] | 110 | jge SHORT .CheckIfRightPartitionNeedsMoreSorting
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[45] | 111 | xchg ax, si ; AX = first index, SI = Index of leftmost unsorted item
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| 112 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 113 | xchg ax, si ; AX = Index of leftmost unsorted item
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| 114 |
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| 115 | .CheckIfRightPartitionNeedsMoreSorting:
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| 116 | cmp ax, di ; if (Index of leftmost unsorted item < last index)
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[46] | 117 | jge SHORT .SortCompleted
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[45] | 118 | mov dx, di ; DI = Index of leftmost unsorted item
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| 119 | call QuicksortItemsInRangeFromAXtoDXwithQsortParamsInSSBP
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| 120 |
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| 121 | ALIGN JUMP_ALIGN
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| 122 | .SortCompleted:
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| 123 | pop si
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| 124 | pop di
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| 125 | ret
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| 126 |
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| 127 |
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| 128 | ;--------------------------------------------------------------------
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| 129 | ; ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot
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| 130 | ; Parameters:
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| 131 | ; AX: Index of first item in range
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| 132 | ; BX: Comparator function
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| 133 | ; CX: Size of struct in bytes
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| 134 | ; DX: Index of last (included) item in range
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| 135 | ; SS:BP: Ptr to QSORT_PARAMS
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| 136 | ; Returns:
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| 137 | ; AX: Index of first unsorted item
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| 138 | ; DX: Index of last unsorted item
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| 139 | ; Corrupts registers:
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| 140 | ; DS, ES
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| 141 | ;--------------------------------------------------------------------
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| 142 | ALIGN JUMP_ALIGN
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| 143 | ArrangeItemsInRangeAXtoDXusingMiddleItemAsPivot:
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| 144 | push di
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| 145 | push si
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| 146 |
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| 147 | call .GetPivotPointerToESDI
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| 148 | call ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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| 149 |
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| 150 | pop si
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| 151 | pop di
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| 152 | ret
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| 153 |
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| 154 | ALIGN JUMP_ALIGN
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| 155 | .GetPivotPointerToESDI:
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| 156 | push ax
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[46] | 157 |
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[45] | 158 | add ax, dx
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[46] | 159 | shr ax, 1 ; AX = Middle index in partition
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[45] | 160 | call GetItemPointerToDSSIfromIndexInAX
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[46] | 161 | call GetPointerToTemporaryItemToESDI
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| 162 | add di, cx ; Pivot is after temporary item
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| 163 | call CopyItemFromDSSItoESDI
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| 164 | sub di, cx ; Restore DI
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| 165 |
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[45] | 166 | pop ax
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[46] | 167 | ret
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[45] | 168 |
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| 169 |
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| 170 | ;--------------------------------------------------------------------
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| 171 | ; ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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| 172 | ; Parameters:
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| 173 | ; AX: Index of first item in range
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| 174 | ; BX: Comparator function
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| 175 | ; CX: Size of struct in bytes
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| 176 | ; DX: Index of last (included) item in range
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| 177 | ; ES:DI: Ptr to Pivot item
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| 178 | ; SS:BP: Ptr to QSORT_PARAMS
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| 179 | ; Returns:
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| 180 | ; AX: Index of first unsorted item
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| 181 | ; DX: Index of last unsorted item
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| 182 | ; Corrupts registers:
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| 183 | ; SI, DS
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| 184 | ;--------------------------------------------------------------------
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| 185 | ALIGN JUMP_ALIGN
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| 186 | ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI:
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| 187 | cmp ax, dx ; while (left <= right)
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[46] | 188 | jg SHORT .BreakLoopSinceAllItemsExamined
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[45] | 189 |
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| 190 | call GetItemPointerToDSSIfromIndexInAX
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| 191 | call .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI
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| 192 |
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| 193 | call GetItemPointerToDSSIfromIndexInDX
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| 194 | call .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI
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| 195 |
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| 196 | cmp ax, dx ; If (left <= right)
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[46] | 197 | jg SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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[45] | 198 | call SwapItemsFromIndexesAXandDX
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| 199 | inc ax
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| 200 | dec dx
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| 201 | jmp SHORT ArrangeItemsInRangeAXtoDXtoBothSidesOfPivotInESDI
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| 202 |
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| 203 | ALIGN JUMP_ALIGN
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| 204 | .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI:
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| 205 | call bx
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| 206 | jge SHORT .NoNeedToIncrementOrDecrementAnyMore
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| 207 | inc ax ; Increment item index
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| 208 | add si, cx ; Point to next struct
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| 209 | jmp SHORT .GetIndexOfLeftmostItemToAXforItemThatIsGreaterThanEqualToPivotInESDI
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| 210 |
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| 211 | ALIGN JUMP_ALIGN
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| 212 | .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI:
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| 213 | call bx
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| 214 | jle SHORT .NoNeedToIncrementOrDecrementAnyMore
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| 215 | dec dx
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| 216 | sub si, cx
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| 217 | jmp SHORT .GetIndexOfRightmostItemToDXforItemThatIsGreaterThanPivotInESDI
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| 218 |
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| 219 | ALIGN JUMP_ALIGN
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| 220 | .NoNeedToIncrementOrDecrementAnyMore:
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| 221 | .BreakLoopSinceAllItemsExamined:
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| 222 | ret
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| 223 |
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| 224 |
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| 225 | ;--------------------------------------------------------------------
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| 226 | ; SwapItemsFromIndexesAXandDX
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| 227 | ; Parameters:
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| 228 | ; AX: Index of item 1
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| 229 | ; CX: Size of struct in bytes
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| 230 | ; DX: Index of item 2
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| 231 | ; SS:BP: Ptr to QSORT_PARAMS
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| 232 | ; Returns:
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| 233 | ; Nothing
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| 234 | ; Corrupts registers:
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| 235 | ; SI, DS
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| 236 | ;--------------------------------------------------------------------
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| 237 | ALIGN JUMP_ALIGN
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| 238 | SwapItemsFromIndexesAXandDX:
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| 239 | push es
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| 240 | push di
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| 241 |
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| 242 | ; Item AX to stack
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[46] | 243 | call GetPointerToTemporaryItemToESDI
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[45] | 244 | call GetItemPointerToDSSIfromIndexInAX
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[46] | 245 | call CopyItemFromDSSItoESDI
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[45] | 246 |
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| 247 | ; Item DX to Item AX
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[54] | 248 | call Registers_ExchangeDSSIwithESDI
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[45] | 249 | call GetItemPointerToDSSIfromIndexInDX
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[46] | 250 | call CopyItemFromDSSItoESDI
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[45] | 251 |
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| 252 | ; Stack to Item DX
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[46] | 253 | call GetPointerToTemporaryItemToESDI
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[54] | 254 | call Registers_ExchangeDSSIwithESDI
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[46] | 255 | call CopyItemFromDSSItoESDI
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[45] | 256 |
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| 257 | pop di
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| 258 | pop es
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| 259 | ret
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| 260 |
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[46] | 261 |
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| 262 | ;--------------------------------------------------------------------
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| 263 | ; GetPointerToTemporaryItemToESDI
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| 264 | ; Parameters:
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| 265 | ; SS:BP: Ptr to QSORT_PARAMS
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| 266 | ; Returns:
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| 267 | ; ES:DI: Ptr to temporary item
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| 268 | ; Corrupts registers:
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| 269 | ; Nothing
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| 270 | ;--------------------------------------------------------------------
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[45] | 271 | ALIGN JUMP_ALIGN
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[46] | 272 | GetPointerToTemporaryItemToESDI:
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| 273 | lea di, [bp+QSORT_PARAMS.tempAndPivotItems]
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[45] | 274 | push ss
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| 275 | pop es
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| 276 | ret
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| 277 |
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| 278 |
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| 279 | ;--------------------------------------------------------------------
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| 280 | ; GetItemPointerToDSSIfromIndexInDX
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| 281 | ; GetItemPointerToDSSIfromIndexInAX
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| 282 | ; Parameters:
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| 283 | ; AX or DX: Item index
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| 284 | ; CX: Size of struct in bytes
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| 285 | ; SS:BP: Ptr to QSORT_PARAMS
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| 286 | ; Returns:
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| 287 | ; DS:SI: Ptr to item
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| 288 | ; Corrupts registers:
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| 289 | ; Nothing
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| 290 | ;--------------------------------------------------------------------
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| 291 | ALIGN JUMP_ALIGN
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| 292 | GetItemPointerToDSSIfromIndexInDX:
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| 293 | xchg ax, dx
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| 294 | call GetItemPointerToDSSIfromIndexInAX
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| 295 | xchg dx, ax
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| 296 | ret
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| 297 |
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| 298 | ALIGN JUMP_ALIGN
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| 299 | GetItemPointerToDSSIfromIndexInAX:
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| 300 | push dx
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| 301 | push ax
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| 302 |
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| 303 | mul cx ; DX:AX = index (AX) * size of struct (CX)
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| 304 | lds si, [bp+QSORT_PARAMS.lpItems]
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| 305 | add si, ax
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| 306 |
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| 307 | pop ax
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| 308 | pop dx
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| 309 | ret
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[46] | 310 |
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| 311 |
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| 312 | ;--------------------------------------------------------------------
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| 313 | ; CopyItemFromDSSItoESDI
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| 314 | ; Parameters:
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| 315 | ; CX: Item size in bytes
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| 316 | ; DS:SI: Ptr to source item
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| 317 | ; ES:DI: Ptr to destination buffer
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| 318 | ; Returns:
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| 319 | ; Nothing
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| 320 | ; Corrupts registers:
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| 321 | ; DI
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| 322 | ;--------------------------------------------------------------------
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| 323 | ALIGN JUMP_ALIGN
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| 324 | CopyItemFromDSSItoESDI:
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| 325 | call Memory_CopyCXbytesFromDSSItoESDI
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| 326 | sub si, cx ; Restore SI
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| 327 | ret
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