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wbSort.pas
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{*******************************************************************************
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
License for the specific language governing rights and limitations
under the License.
*******************************************************************************}
unit wbSort;
{$I wbDefines.inc}
interface
uses
Classes, wbInterface;
procedure wbMergeSort(aList: Pointer; aCount: Integer; aCompare: TListSortCompare);
implementation
type
TwbMove = procedure(const Source; var Dest; Count : Integer);
var
wbMove : TwbMove = nil;
const
// x64 - use InsertionSort instead MergeSort for small arrays
MIN_SIZE = 32;
{$IFDEF WIN32}
function wbMergeSortInternal(_A, _B: PwbPointerArray; _Count : Integer; _Compare: TListSortCompare): PwbPointerArray; register;
const
SizeOfPointer = SizeOf(Pointer);
SizeOf2Pointer = 2 * SizeOf(Pointer);
EspOffset = $38;
A = EspOffset - SizeOfPointer * 1;
B = EspOffset - SizeOfPointer * 2;
Compare = EspOffset+$08; //sometimes ebp
Temp = EspOffset - SizeOfPointer * 3;
Count = EspOffset - SizeOfPointer * 4;
SegmentSize = EspOffset - SizeOfPointer * 5;
Temp2 = EspOffset - SizeOfPointer * 6;
pRightEnd = EspOffset - SizeOfPointer * 7;
pLeftEnd = EspOffset - SizeOfPointer * 8;
pListEnd = EspOffset - SizeOfPointer * 9;
pNextLeft = EspOffset - SizeOfPointer * 10;
SavedCompares = EspOffset - SizeOfPointer * 11;
asm
{ begin }
sub esp, EspOffset
mov [esp + 00], edi
mov [esp + 08], esi
mov [esp + 04], ebx
mov [esp+Count], ecx
mov [esp+B], edx
mov [esp+A], eax
{======== first run =========================================================}
xor ebp, ebp
{ pBuffer := @b; }
mov edi, [esp+B]
{ pLeft := @a; }
mov esi, [esp+A]
{ pListEnd := @a[Pred(Count)]; }
mov ebx, [esp+Count]
dec ebx
lea ebx, [esi+ebx*SizeOfPointer]
mov dword ptr [esp+Temp], 0
jmp @@FirstRun_CompareLoop
nop
nop
nop
nop
nop
nop
nop
@@FirstRun_CompareLoop:
{ if Compare(pLeft^, pRight^) <= 0 then begin }
mov eax, [esi]
mov edx, [esi + SizeOfPointer]
call [esp+Compare]
test eax, eax
jg @@FirstRun_MergeFromRight
jl @@FirstRun_MergeFromLeft
add dword ptr [esp+Temp], 1
jmp @@FirstRun_MergeFromLeft
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
@@FirstRun_MergeFromLeft:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ pBuffer+1^ := pLeft+1^; }
mov eax, [esi + SizeOfPointer]
mov [edi + SizeOfPointer], eax
{ Inc(pBuffer, 2); }
add edi, SizeOf2Pointer
{ Inc(pLeft, 2); }
add esi, SizeOf2Pointer
{ until pLeft+1 >= pListEnd }
cmp esi, ebx
jb @@FirstRun_CompareLoop
ja @@FirstRun_NoRemaining
jmp @@FirstRun_CopyRemaining
nop
nop
nop
nop
nop
nop
nop
nop
@@FirstRun_MergeFromRight:
lea ebp, [ebp +1]
{ pBuffer+1^ := pLeft^; }
mov eax, [esi]
mov [edi + SizeOfPointer], eax
{ pBuffer^ := pLeft+1^; }
mov eax, [esi + SizeOfPointer]
mov [edi], eax
{ Inc(pBuffer, 2); }
add edi, SizeOf2Pointer
{ Inc(pLeft, 2); }
add esi, SizeOf2Pointer
{ until pLeft+1 >= pListEnd }
cmp esi, ebx
jb @@FirstRun_CompareLoop
ja @@FirstRun_NoRemaining
@@FirstRun_CopyRemaining:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
nop
nop
nop
@@FirstRun_NoRemaining:
mov edx, ebp
mov ebp, [esp+Compare]
{ if never merged from left... }
test edx, edx
jz @@ShortCutFwd_Entry
{ if always merged from right... }
mov eax, [esp+Count]
shr eax, 1
add edx, [esp+Temp]
cmp edx, eax
je @@ShortCutBwd_Entry
{ T := A; }
mov eax, [esp+A]
{ A := B; }
mov edx, [esp+B]
mov [esp+A], edx
{ B := T; }
mov [esp+B], eax
jmp @@SmallRuns_Entry
{======== shortcut forward run ==============================================}
nop
nop
nop
@@ShortCutFwd_Entry:
{ pLeft := @a; }
mov esi, [esp+A]
{ pListEnd := @a[Pred(Count)]; - still valid}
{ skip first element }
add esi, SizeOfPointer
cmp esi, ebx
jae @@Exit
nop
@@ShortCutFwd_CompareLoop:
{ if Compare(pLeft^, pRight^) <= 0 then begin }
mov eax, [esi]
mov edx, [esi + SizeOfPointer]
call ebp
test eax, eax
{ if any element didn't fit, do a full merge }
jg @@SmallRuns_Entry
{ Inc(pLeft, 2); }
add esi, SizeOf2Pointer
{ until pLeft+1 >= pListEnd }
cmp esi, ebx
jb @@ShortCutFwd_CompareLoop
jmp @@Exit
{======== shortcut forward run ==============================================}
nop
nop
nop
nop
nop
@@ShortCutBwd_Entry:
mov esi, [esp+A]
mov ebx, [esp + Count]
cmp ebx, 2
je @@ShortCutBwd_ExchangeLoop_Entry
sub ebx, 3
or ebx, 1
lea ebx, [esi + ebx * 4]
cmp esi, ebx
jae @@Exit
nop
nop
@@ShortCutBwd_CompareLoop:
{ if Compare(pLeft^, pRight^) <= 0 then begin }
mov eax, [ebx]
mov edx, [ebx + SizeOfPointer]
call ebp
test eax, eax
{ if any element didn't fit, do a full merge }
jl @@ShortCutBwd_Error
{ Inc(pLeft, 2); }
sub ebx, SizeOf2Pointer
{ until pLeft+1 >= pListEnd }
cmp esi, ebx
jb @@ShortCutBwd_CompareLoop
@@ShortCutBwd_ExchangeLoop_Entry:
mov esi, [esp+A]
mov ebx, [esp + Count]
sub ebx, 1
lea ebx, [esi + ebx * 4]
@@ShortCutBwd_ExchangeLoop:
mov eax, [esi]
mov edx, [ebx]
mov [ebx], eax
mov [esi], edx
add esi, SizeOfPointer
sub ebx, SizeOfPointer
cmp esi, ebx
jb @@ShortCutBwd_ExchangeLoop
jmp @@Exit
nop
nop
nop
nop
nop
nop
nop
nop
nop
@@ShortCutBwd_Error:
{ T := A; }
mov eax, [esp+A]
{ A := B; }
mov edx, [esp+B]
mov [esp+A], edx
{ B := T; }
mov [esp+B], eax
jmp @@SmallRuns_Entry
{======== small runs ====================================================}
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
@@SmallRuns_Entry:
{ SegmentSize := 2; }
mov eax, 2
mov dword ptr [esp+SegmentSize], eax
nop
nop
nop
nop
nop
nop
nop
@@SmallRuns_OuterLoop_Entry:
mov ebp, [esp + Compare]
@@SmallRuns_OuterLoop: // requires SegmentSize in eax
{ pBuffer := @b; }
mov edi, [esp+B]
{ pLeft := @a; }
mov esi, [esp+A]
{ pRight := @a[SegmentSize]; }
lea ebx, [esi+eax*SizeOfPointer]
{ pLeftEnd := pRight; }
mov [esp+pLeftEnd], ebx
{ pListEnd := @a[Count]; }
mov edx, [esp+Count]
lea edx, [esi+ edx*SizeOfPointer]
mov [esp+pListEnd], edx
{ pRightEnd := @a[SegmentSize + SegmentSize]; }
lea eax, [ebx+eax*SizeOfPointer]
mov [esp+pRightEnd], eax
jmp @@SmallRuns_InnerLoopEntry //requires pRightEnd in eax and pListEnd in edx
nop
nop
nop
nop
nop
nop
nop
nop
nop
@@SmallRuns_InnerLoopSetRightEnd:
{ pRightEnd := pListEnd; }
mov [esp+pRightEnd], edx
@@SmallRuns_InnerLoop:
@@SmallRuns_CompareLoop:
{ if Compare(pLeft^, pRight^) <= 0 then begin }
mov edx, [ebx]
mov eax, [esi]
call ebp
test eax, eax
jg @@SmallRuns_MergeFromRight
@@SmallRuns_MergeFromLeft:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
{ if Cardinal(pLeft) >= Cardinal(pLeftEnd) then begin }
cmp esi, [esp+pLeftEnd]
jb @@SmallRuns_CompareLoop
nop
nop
@@SmallRuns_CopyRemainingFromRight_Entry:
mov edx, [esp+pRightEnd] //used in CopyRemainingFromRight
@@SmallRuns_CopyRemainingFromRight:
{ pBuffer^ := pRight^; }
mov eax, [ebx]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pRight); }
add ebx, SizeOfPointer
{ while Cardinal(pRight) < Cardinal(pRightEnd) do begin }
cmp ebx, edx
jb @@SmallRuns_CopyRemainingFromRight
{ Break; }
jmp @@SmallRuns_BreakOutOfCompareLoop
@@SmallRuns_MergeBoth:
{ pBuffer^ := pRight^; }
mov eax, [esi]
mov [edi], eax
mov eax, [ebx]
mov [edi + SizeOfPointer], eax
{ Inc(pBuffer); }
add edi, SizeOf2Pointer
{ Inc(pRight); }
add ebx, SizeOfPointer
add esi, SizeOfPointer
cmp esi, [esp+pLeftEnd]
jae @@SmallRuns_LeftDone
cmp ebx, [esp+pRightEnd]
jb @@SmallRuns_CompareLoop
jmp @@SmallRuns_CopyRemainingFromLeft_Entry
@@SmallRuns_LeftDone:
cmp ebx, [esp+pRightEnd]
jb @@SmallRuns_CopyRemainingFromRight_Entry
jmp @@SmallRuns_BreakOutOfCompareLoop
@@SmallRuns_MergeFromRight:
{ pBuffer^ := pRight^; }
mov eax, [ebx]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pRight); }
add ebx, SizeOfPointer
{ if Cardinal(pRight) >= Cardinal(pRightEnd) then begin }
cmp ebx, [esp+pRightEnd]
jb @@SmallRuns_CompareLoop
@@SmallRuns_CopyRemainingFromLeft_Entry:
mov edx, [esp+pLeftEnd] // used in CopyRemainingFromLeft
@@SmallRuns_CopyRemainingFromLeft:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
{ while Cardinal(pLeft) < Cardinal(pLeftEnd) do begin }
cmp esi, edx
jb @@SmallRuns_CopyRemainingFromLeft
@@SmallRuns_BreakOutOfCompareLoop:
{ Inc(pLeft, SegmentSize); }
mov eax, [esp+SegmentSize]
shl eax, 02h
add esi, eax
{ Inc(pRight, SegmentSize); }
add ebx, eax
{ pLeftEnd := pRight; }
mov [esp+pLeftEnd], ebx
{ Inc(pRightEnd, SegmentSize + SegmentSize); }
lea eax, [ebx + eax]
mov [esp+pRightEnd], eax
mov edx, [esp+pListEnd]
@@SmallRuns_InnerLoopEntry: //requires pRightEnd in eax and pListEnd in edx
{ while Cardinal(pRightEnd) <= Cardinal(pListEnd) do begin }
cmp eax, edx
jbe @@SmallRuns_InnerLoop
{ if Cardinal(pLeft) < Cardinal(pListEnd) then begin }
cmp edx, esi
jbe @@SmallRuns_NoRemaining
{ if Cardinal(pRight) < Cardinal(pListEnd) then begin }
cmp edx, ebx
ja @@SmallRuns_InnerLoopSetRightEnd
@@SmallRuns_CopyRemaining:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
{ while Cardinal(pLeft) < Cardinal(pListEnd) do begin }
cmp esi, edx
jb @@SmallRuns_CopyRemaining
@@SmallRuns_NoRemaining:
{ T := A; }
mov eax, [esp+A]
{ A := B; }
mov edx, [esp+B]
mov [esp+A], edx
{ B := T; }
mov [esp+B], eax
{ SegmentSize := SegmentSize shl 1; }
mov eax, [esp+SegmentSize]
shl eax, 1
mov [esp+SegmentSize], eax
{ while SegmentSize < Count do begin }
cmp eax, [esp+Count]
jge @@Exit
cmp eax, 128
jne @@SmallRuns_OuterLoop // requires SegmentSize in eax
{======== large runs ====================================================}
@@LargeRuns_OuterLoop: // requires SegmentSize in eax
{ pBuffer := @b; }
mov edi, [esp+B]
{ pLeft := @a; }
mov esi, [esp+A]
{ pRight := @a[SegmentSize]; }
lea ebx, [esi+eax*SizeOfPointer]
{ pLeftEnd := pRight; }
mov [esp+pLeftEnd], ebx
{ pListEnd := @a[Count]; }
mov edx, [esp+Count]
lea edx, [esi+ edx*SizeOfPointer]
mov [esp+pListEnd], edx
{ pRightEnd := @a[SegmentSize + SegmentSize]; }
lea eax, [ebx+eax*SizeOfPointer]
mov [esp+pRightEnd], eax
mov [esp+pNextLeft], eax
mov [esp+SavedCompares], 0
jmp @@LargeRuns_InnerLoopEntry //requires pRightEnd in eax and pListEnd in edx
nop
nop
nop
@@LargeRuns_InnerLoopSetRightEnd:
{ pRightEnd := pListEnd; }
mov [esp+pRightEnd], edx
mov [esp+pNextLeft], edx
@@LargeRuns_InnerLoop:
{ Compare(pLeft^, pRight^) }
mov edx, [ebx]
mov eax, [esi]
call [esp+Compare]
test eax, eax
{ if equal -> perfect overlap, copy both, no need to waste a comparison... }
je @@LargeRuns_CopyBoth
mov edx, [esp+pLeftEnd]
jl @@LargeRuns_MoveFromLeft // requires LeftEnd in edx
@@LargeRuns_SwitchLeftAndRight:
{ if greater -> right one is smaller }
{ move it over to the buffer, no need to waste a comparison}
mov ecx, [ebx]
mov [edi], ecx
add ebx, SizeOfPointer
add edi, SizeOfPointer
{ switch left and right }
xchg ebx, esi
mov eax, [esp+pRightEnd]
mov [esp+pLeftEnd], eax
mov [esp+pRightEnd], edx
{ if we reached the end, copy the rest }
cmp esi, eax
jae @@LargeRuns_CopyRemainingFromRight_Entry
mov edx, eax
jmp @@LargeRuns_CompareLeftEndAndRight
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
@@LargeRuns_MoveFromLeft: // requires LeftEnd in edx
{ if lesser -> left one is smaller}
{ move it over to the buffer, no need to waste a comparison}
mov ecx, [esi]
mov [edi], ecx
add esi, SizeOfPointer
add edi, SizeOfPointer
{ if we reached the end, copy the rest }
cmp esi, edx{LeftEnd}
jae @@LargeRuns_CopyRemainingFromRight_Entry
@@LargeRuns_CompareLeftEndAndRight: // requires LeftEnd in edx
sub edx, SizeOfPointer
mov eax, [edx]
mov edx, [ebx]
call [esp+Compare]
test eax, eax
jg @@LargeRuns_BinarySearchLeft_Entry
{ LeftEnd <= Right, no need to continue merging, just copy and get out of here }
{ first copy just left }
mov eax, esi
mov edx, edi
mov ecx, [esp+pLeftEnd]
sub ecx, eax
add edi, ecx
add [esp+SavedCompares], ecx
call [wbMove]
{ then copy just right }
mov eax, ebx
mov edx, edi
mov ecx, [esp+pRightEnd]
sub ecx, eax
add edi, ecx
add [esp+SavedCompares], ecx
call [wbMove]
{ we are done here }
jmp @@LargeRuns_BreakOutOfCompareLoop
nop
nop
nop
nop
nop
nop
@@LargeRuns_CopyBoth:
mov eax, [ebx]
mov [edi], eax
mov eax, [esi]
mov [edi + SizeOfPointer], eax
add ebx, SizeOfPointer
add esi, SizeOfPointer
add edi, SizeOf2Pointer
cmp esi, [esp+pLeftEnd]
jae @@LargeRuns_CopyRemainingFromRight_Entry
cmp ebx, [esp+pRightEnd]
jae @@LargeRuns_CopyRemainingFromLeft_Entry
jmp @@LargeRuns_InnerLoop
nop
nop
nop
nop
nop
@@LargeRuns_BinarySearchLeft_Entry:
{ save our old Left }
mov [esp+Temp], esi
{ save our old Buffer }
mov [esp+Temp2], edi
mov edi, [esp+pLeftEnd]
sub edi, SizeOfPointer
{ we start with esi = Low and edi = High}
nop
@@LargeRuns_BinarySearchLeft_Loop:
{ calculate the middle into ebp }
mov ebp, edi
sub ebp, esi
shr ebp, 3
lea ebp, [esi + ebp *4];
{ compare middle with Right}
mov eax, [ebp]
mov edx, [ebx]
sub [esp+SavedCompares], 4
call [esp+Compare]
test eax, eax
jg @@LargeRuns_BinarySearchLeft_Greater
@@LargeRuns_BinarySearchLeft_LesserOrEqual:
{ move the lower bound }
lea esi, [ebp + SizeOfPointer]
cmp esi, edi
jbe @@LargeRuns_BinarySearchLeft_Loop
jmp @@LargeRuns_BinarySearchLeft_Exit
@@LargeRuns_BinarySearchLeft_Greater:
{ mov the higher bound }
lea edi, [ebp - SizeOfPointer]
cmp esi, edi
jbe @@LargeRuns_BinarySearchLeft_Loop
jmp @@LargeRuns_BinarySearchLeft_Exit
nop
nop
nop
nop
nop
nop
nop
@@LargeRuns_BinarySearchLeft_Exit:
{ edi is pointing to the last entry that's <= Right }
{ get our old left }
mov esi, [esp+Temp]
mov edx, edi
{ restore Buffer}
mov edi, [esp+Temp2]
jmp @@LargeRuns_BinarySearchLeft_CopyLeadingLeft_Entry
nop
nop
nop
nop
@@LargeRuns_BinarySearchLeft_CopyLeadingLeft_Loop:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
add [esp+SavedCompares], 4
{ while Cardinal(pLeft) <= FoundItem do begin }
@@LargeRuns_BinarySearchLeft_CopyLeadingLeft_Entry:
cmp esi, edx
jbe @@LargeRuns_BinarySearchLeft_CopyLeadingLeft_Loop
{ we've copied all entries from Left that where <= Right }
{ are we done with Left? }
cmp esi, [esp+pLeftEnd]
jae @@LargeRuns_CopyRemainingFromRight_Entry
{ pBuffer^ := pRight^; }
mov eax, [ebx]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pRight); }
add ebx, SizeOfPointer
{ are we done with Right? }
cmp ebx, [esp+pRightEnd]
jae @@LargeRuns_CopyRemainingFromLeft_Entry
{ now we can start with the normal compare loop}
mov ebp, [esp+Compare]
jmp @@LargeRuns_CompareLoop
nop
nop
nop
nop
nop
nop
@@LargeRuns_CompareLoop:
{ if Compare(pLeft^, pRight^) <= 0 then begin }
mov edx, [ebx]
mov eax, [esi]
call ebp
test eax, eax
jg @@LargeRuns_MergeFromRight
@@LargeRuns_MergeFromLeft:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
{ if Cardinal(pLeft) >= Cardinal(pLeftEnd) then begin }
cmp esi, [esp+pLeftEnd]
jb @@LargeRuns_CompareLoop
nop
nop
@@LargeRuns_CopyRemainingFromRight_Entry:
mov edx, [esp+pRightEnd] //used in CopyRemainingFromRight
@@LargeRuns_CopyRemainingFromRight:
{ pBuffer^ := pRight^; }
mov eax, [ebx]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pRight); }
add ebx, SizeOfPointer
{ while Cardinal(pRight) < Cardinal(pRightEnd) do begin }
cmp ebx, edx
jb @@LargeRuns_CopyRemainingFromRight
{ Break; }
jmp @@LargeRuns_BreakOutOfCompareLoop
@@LargeRuns_MergeFromRight:
{ pBuffer^ := pRight^; }
mov eax, [ebx]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pRight); }
add ebx, SizeOfPointer
{ if Cardinal(pRight) >= Cardinal(pRightEnd) then begin }
cmp ebx, [esp+pRightEnd]
jb @@LargeRuns_CompareLoop
@@LargeRuns_CopyRemainingFromLeft_Entry:
mov edx, [esp+pLeftEnd] // used in CopyRemainingFromLeft
@@LargeRuns_CopyRemainingFromLeft:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
{ while Cardinal(pLeft) < Cardinal(pLeftEnd) do begin }
cmp esi, edx
jb @@LargeRuns_CopyRemainingFromLeft
@@LargeRuns_BreakOutOfCompareLoop:
{ Inc(pLeft, SegmentSize); }
mov eax, [esp+SegmentSize]
shl eax, 02h
mov esi, [esp+pNextLeft]
{ Inc(pRight, SegmentSize); }
lea ebx, [esi + eax]
{ pLeftEnd := pRight; }
mov [esp+pLeftEnd], ebx
{ Inc(pRightEnd, SegmentSize + SegmentSize); }
lea eax, [ebx + eax]
mov [esp+pRightEnd], eax
mov [esp+pNextLeft], eax
mov edx, [esp+pListEnd]
@@LargeRuns_InnerLoopEntry: //requires pRightEnd in eax and pListEnd in edx
{ while Cardinal(pRightEnd) <= Cardinal(pListEnd) do begin }
cmp eax, edx
jbe @@LargeRuns_InnerLoop
{ if Cardinal(pLeft) < Cardinal(pListEnd) then begin }
cmp edx, esi
jbe @@LargeRuns_NoRemaining
{ if Cardinal(pRight) < Cardinal(pListEnd) then begin }
cmp edx, ebx
ja @@LargeRuns_InnerLoopSetRightEnd
@@LargeRuns_CopyRemaining:
{ pBuffer^ := pLeft^; }
mov eax, [esi]
mov [edi], eax
{ Inc(pBuffer); }
add edi, SizeOfPointer
{ Inc(pLeft); }
add esi, SizeOfPointer
{ while Cardinal(pLeft) < Cardinal(pListEnd) do begin }
cmp esi, edx
jb @@LargeRuns_CopyRemaining
@@LargeRuns_NoRemaining:
{ T := A; }
mov eax, [esp+A]
{ A := B; }
mov edx, [esp+B]
mov [esp+A], edx
{ B := T; }
mov [esp+B], eax
{ SegmentSize := SegmentSize shl 1; }
mov eax, [esp+SegmentSize]
shl eax, 1
mov [esp+SegmentSize], eax
{ while SegmentSize < Count do begin }
mov edx, [esp+Count]
cmp eax, edx
jge @@Exit
cmp [esp+SavedCompares], edx
jl @@SmallRuns_OuterLoop_Entry
jmp @@LargeRuns_OuterLoop // requires SegmentSize in eax
@@Exit:
{ Result := A; }
mov eax, [esp+A]
{ end; }
mov edi, [esp + 00]
mov esi, [esp + 08]
mov ebx, [esp + 04]
add esp, EspOffset
end;
procedure wbMergeSort(aList: Pointer; aCount: Integer; aCompare: TListSortCompare);
procedure UseStackBufferLarge;
var
Buffer: array[0..Pred(4 * 1024)] of Pointer;
begin
if wbMergeSortInternal(aList, @Buffer[0], aCount, aCompare) <> aList then
Move(Buffer, aList^, aCount * SizeOf(Pointer) );
end;
procedure UseStackBufferSmall;
var
Buffer: array[0..Pred(1024)] of Pointer;
begin
if wbMergeSortInternal(aList, @Buffer[0], aCount, aCompare) <> aList then
Move(Buffer, aList^, aCount * SizeOf(Pointer) );
end;
var
Buffer: Pointer;
begin
if (aCount < 2) or (not Assigned(aList)) then
Exit;
if aCount > 4 * 1024 then begin
GetMem(Buffer, aCount * SizeOf(Pointer));
if wbMergeSortInternal(aList, Buffer, aCount, aCompare) <> aList then
Move(Buffer^, aList^, aCount * SizeOf(Pointer));
FreeMem(Buffer);
end else if aCount > 1024 then
UseStackBufferLarge
else
UseStackBufferSmall;
end;
{$ENDIF WIN32}
{$IFDEF WIN64}
procedure InsertionSort(aList: PwbPointerArray; left, right: integer; aCompare: TListSortCompare);
var
i: Integer;
j: integer;
temp: Pointer;
begin
for i := Succ(left) to right do begin
j := i;
temp := aList[j];
while (j > left) AND (aCompare(temp, aList[Pred(j)]) < 0) do begin
aList[j] := aList[Pred(j)];
dec(j);
end;
aList[j] := temp;
end;
end;
procedure MergeSort(ptrList: PwbPointerArray; left: Integer; right: Integer; aCompare: TListSortCompare; Buffer: PwbPointerArray);
var
i, j, k, mid, aCount: Integer;
begin
mid := (left + right) div 2;