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| unit FillMemory_MainForm;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
{ Déclarations privées }
public
{ Déclarations publiques }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
const
FORMAT_MICRO_SECONDE = '%.2d:%.2d:%.2d:%.3d:%.3d';
//------------------------------------------------------------------------------
procedure GetBeginTime(var Value: Int64);
begin
QueryPerformanceCounter(Value);
end;
//------------------------------------------------------------------------------
function ElapsedTime(const BeginTime: Int64): Int64;
var
EndTime, TickPerSec: Int64;
begin
QueryPerformanceCounter(EndTime);
QueryPerformanceFrequency(TickPerSec);
Result := Round((EndTime - BeginTime) / TickPerSec * 1000000);
end;
//------------------------------------------------------------------------------
function FormatElapsedTime(ADelay: Int64; const AFormat: string = FORMAT_MICRO_SECONDE): string;
var
Hour, Min, Sec, MilliSecond: Int64;
begin
Hour := ADelay div 3600000000;
ADelay := ADelay mod 3600000000;
Min := ADelay div 60000000;
ADelay := ADelay mod 60000000;
Sec := ADelay div 1000000;
ADelay := ADelay mod 1000000;
MilliSecond := ADelay div 1000;
ADelay := ADelay mod 1000;
Result := Format(AFormat, [Hour, Min, Sec, MilliSecond, ADelay]);
end;
//------------------------------------------------------------------------------
procedure TForm1.Button1Click(Sender: TObject);
var
qpfStart, qpfBench: Int64;
i, n: cardinal;
tab : array of cardinal;
Fill : cardinal;
P: ^Cardinal;
begin
n := 1000000;
SetLength(tab, n);
Fill := 10;
GetBeginTime(qpfStart);
System.FillChar(tab[0], n * SizeOf(tab[0]), 0); // Remplissage par Registre 64 Bits
Memo1.Lines.Add('FillChar = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
GetBeginTime(qpfStart);
Winapi.Windows.ZeroMemory(@tab[0], n * SizeOf(tab[0])); // Algo Microsoft
Memo1.Lines.Add('ZeroMemory = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
GetBeginTime(qpfStart);
Winapi.Windows.FillMemory(@tab[0], n * SizeOf(tab[0]), 0); // Algo Microsoft
Memo1.Lines.Add('FillMemory = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
Fill := 10;
GetBeginTime(qpfStart);
for i := 0 to n-1 do
tab[i] := Fill +i;
Memo1.Lines.Add('for tab[i] Fill + i = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
FillChar(tab[0], n * SizeOf(tab[0]), 0);
Fill := 10;
GetBeginTime(qpfStart);
for i := 0 to n-1 do
begin
tab[i] := Fill;
Inc(Fill);
end;
Memo1.Lines.Add('for tab[i] Inc(Fill) = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
FillChar(tab[0], n * SizeOf(tab[0]), 0);
Fill := 10;
GetBeginTime(qpfStart);
P := @tab[0];
for i := 0 to n-1 do
begin
P^ := Fill + i;
Inc(P); // décale de la taille selon le type de pointeur
end;
Memo1.Lines.Add('for P^ Fill + i = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
FillChar(tab[0], n * SizeOf(tab[0]), 0);
Fill := 10;
GetBeginTime(qpfStart);
P := @tab[0];
for i := 0 to n-1 do
begin
P^ := Fill;
Inc(Fill);
Inc(P); // décale de la taille selon le type de pointeur
end;
Memo1.Lines.Add('for P^ Inc(Fill) = '#9 + FormatElapsedTime(ElapsedTime(qpfStart)));
Memo1.Lines.Add('---');
end;
end. |
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