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unit HRTimer;
{High resolution timer routines with comp data type}
{and PerformanceCounter routines for WIN32/64 }
interface
{$i STD.INC}
{$ifndef CPUARM}
{$define AUTOHALT} {halt(99) if no RDTSC support}
{$endif}
(*************************************************************************
DESCRIPTION : High resolution timer routines with comp data type
PerformanceCounter routines for WIN32/64
REQUIREMENTS : TP5-7, D1-D7/D9-D10/D12/D17-D18, FPC, VP
EXTERNAL DATA : ---
MEMORY USAGE : ---
DISPLAY MODE : ---
REFERENCES : ---
Version Date Author Modification
------- -------- ------- ------------------------------------------
0.10 15.11.03 W.Ehrhardt Initial version: TP6/7, D2-D6, VP
0.11 15.11.03 we FPC
0.12 15.11.03 we BP7 WIN/DPMI, D1
0.13 16.11.03 we 16 bit ASM, ReadTSC, TP5/5.5
0.14 29.11.03 we {$define AUTOHALT}
0.15 06.13.03 we Uses unit TSC
0.16 01.01.04 we Insert missing u in CPUFrequency :)
0.17 02.01.04 we Calibration, new functions
0.18 06.01.04 we FPC-Warnings off for comp:=comp-comp
0.19 11.04.04 we Delphi 7
0.20 09.04.05 we CPUFrequency from GetTickCount if high-res
performance counter N/A; Delphi 9, WDOSX
0.21 11.12.05 we RestartTimer
0.22 20.11.07 we Fix for WIN32 and $X-
0.23 30.03.08 we CalcCPUFrequency via sysutils.time on non-Windows 32 bit systems
0.24 05.07.09 we D12 fix (int64 absolute comp)
0.25 06.07.09 we CPUFrequency: double, check monotony
0.26 19.01.12 we BIT32or64
0.27 17.12.12 we D17 adjustment
0.28 25.12.12 we $J+ via J_OPT
0.29 17.03.17 we Simple hacks for FPC/CPUARM
**************************************************************************)
(*-------------------------------------------------------------------------
(C) Copyright 2003-2017 Wolfgang Ehrhardt
This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from
the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software in
a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
----------------------------------------------------------------------------*)
{$ifndef FPC}
{$B-,N+}
{$endif}
{$ifdef J_OPT}
{$J+}
{$endif}
uses TSC;
const
CPUFrequency : double = -1; {CPU Frequency in Hz}
type
THRTimer = record
Start: comp; {First read after calib}
Diff0: comp; {Min diff for two reads}
Last : comp; {Last read after start }
end;
function HasRDTSC: boolean;
{-check if rdtsc supported}
procedure ReadTSC(var Cnt: Comp);
{-Read Time Stamp Counter}
procedure StartTimer(var HR: THRTimer);
{-Start and calibrates timer}
procedure RestartTimer(var HR: THRTimer);
{-Read TSC into HR.Start}
function ReadSeconds(var HR: THRTimer): double;
{-Return elapsed (calibrated) seconds since Start}
function ReadCycles(var HR: THRTimer): comp;
{-Return elapsed (calibrated) cycles since Start}
function LastSeconds(var HR: THRTimer): double;
{-Return elapsed (calibrated) seconds since Start using Last}
function LastCycles(var HR: THRTimer): comp;
{-Return elapsed (calibrated) cycles since Start using Last}
procedure StoreLast(var HR: THRTimer);
{-Read TSC into last}
{$ifdef WIN32or64}
function PerformanceCounter(var Cnt: Comp): boolean;
{-Get value high-resolution performance counter}
function PerformanceFrequency(var Freq: Comp): boolean;
{-Get frequency of the high-resolution performance counter}
{$endif}
procedure CalcCPUFrequency;
{-Calculate CPU frequency, called from initialisation}
implementation
{$ifdef BIT32or64}
{$ifdef WIN32or64}
{$ifdef UNIT_SCOPE}
uses winapi.windows;
{$else}
uses windows;
{$endif}
{$else}
uses sysutils;
{$endif}
{$endif}
{---------------------------------------------------------------------------}
procedure ReadTSC(var Cnt: Comp);
{-Read Time Stamp Counter}
begin
_ReadTSC(TCtrRec(Cnt));
end;
{$ifdef FPC} {$WARNINGS OFF} {$endif} {Warning for comp := comp-comp}
{---------------------------------------------------------------------------}
procedure StartTimer(var HR: THRTimer);
{-Start and calibrates timer HR}
const
CALCNT = 10;
var
i: integer;
Stop,Diff: comp;
begin
with HR do begin
{Measure empty statement several times, take minimum as Diff0}
ReadTSC(Start);
ReadTSC(Stop);
Diff0 := Stop-Start;
for i:=1 to CALCNT-1 do begin
ReadTSC(Start);
ReadTSC(Stop);
Diff := Stop-Start;
if Diff<Diff0 then Diff0 := Diff;
end;
if Diff0<0 then Diff0 := 0;
{Start measurement}
ReadTSC(Start);
end;
end;
{---------------------------------------------------------------------------}
procedure RestartTimer(var HR: THRTimer);
{-Read TSC into HR.Start}
begin
ReadTSC(HR.Start);
end;
{---------------------------------------------------------------------------}
function LastCycles(var HR: THRTimer): comp;
{-Return elapsed (calibrated) cycles since Start using Last}
begin
with HR do LastCycles := Last-Start-Diff0;
end;
{---------------------------------------------------------------------------}
function LastSeconds(var HR: THRTimer): double;
{-Return elapsed (calibrated) seconds since Start using Last}
begin
LastSeconds := LastCycles(HR)/CPUFrequency;
end;
{---------------------------------------------------------------------------}
function ReadCycles(var HR: THRTimer): comp;
{-Return elapsed (calibrated) cycles since Start}
begin
with HR do begin
ReadTSC(Last);
ReadCycles := Last-Start-Diff0;
end;
end;
{$ifdef FPC} {$WARNINGS ON} {$endif}
{---------------------------------------------------------------------------}
function ReadSeconds(var HR: THRTimer): double;
{-Return elapsed (calibrated) seconds since Start}
begin
ReadSeconds := ReadCycles(HR)/CPUFrequency;
end;
{---------------------------------------------------------------------------}
procedure StoreLast(var HR: THRTimer);
{-Read TSC into last}
begin
ReadTSC(HR.Last);
end;
{---------------------------------------------------------------------------}
function HasRDTSC: boolean;
{-check if RDTSC supported}
begin
HasRDTSC := _HasRDTSC;
end;
{$ifdef BIT32or64}
{$ifdef WIN32or64}
{---------------------------------------------------------------------------}
function PerformanceCounter(var Cnt: Comp): boolean;
{-Get value high-resolution performance counter}
{$ifdef D4Plus}
var c64: int64 absolute cnt; {D12 does not allow typecast Comp <-> TULargeInteger}
{$endif}
begin
{$ifdef D4Plus}
PerformanceCounter := QueryPerformanceCounter(c64);
{$else}
{FPC does not lile 'result'}
PerformanceCounter := QueryPerformanceCounter(TLargeInteger(Cnt));
{$endif}
end;
{---------------------------------------------------------------------------}
function PerformanceFrequency(var Freq: Comp): boolean;
{-Get frequency of the high-resolution performance counter}
{$ifdef D4Plus}
var c64: int64 absolute Freq; {D12 does not allow typecast Comp <-> TULargeInteger}
{$endif}
begin
{$ifdef D4Plus}
PerformanceFrequency := QueryPerformanceFrequency(c64);
{$else}
PerformanceFrequency := QueryPerformanceFrequency(TLargeInteger(Freq));
{$endif}
end;
{---------------------------------------------------------------------------}
procedure CalcCPUFrequency;
{-Calculate CPU frequency from 100 ms}
var
f,c1,c2,r1,r2: comp;
t0, t1, t2: longint;
done: boolean;
begin
done := false;
{note that this code is suboptimal for multicore systems!}
if PerformanceFrequency(f) and PerformanceCounter(c1) then begin
ReadTSC(r1);
sleep(100);
if PerformanceCounter(c2) then ;
ReadTSC(r2);
if (c2>c1) and (r2>r1) then begin
CPUFrequency := (r2 - r1) * f / (c2 - c1);
done := true;
end;
end;
if not done then begin
{high-resolution performance counter not available, calc from GetTickCount}
t2:=GetTickCount;
repeat
t1:=GetTickCount;
until t1<>t2;
ReadTSC(r1);
repeat
t0:=GetTickCount;
until t1<>t0;
repeat
t2:=GetTickCount;
until t0<>t2;
ReadTSC(r2);
CPUFrequency := (r2 - r1) * 1000 / (t2 - t1);
end;
end;
{$else}
{---------------------------------------------------------------------------}
procedure CalcCPUFrequency;
{-Calculate CPU frequency for BIT32/64 and not WIN32/64}
var
r1,r2: comp;
t0, t1, t2: longint;
begin
{Assume now high-resolution performance counter and no systick}
{available. Calculate CPU frequency from TSC and 10ms changes.}
{$ifdef debug}
{$ifdef HAS_MSG}
{$message 'CalcCPUFrequency via sysutils.time'}
{$endif}
{$endif}
t2:=round(8640000*time);
repeat
t1:=round(8640000*time);
until t1<>t2;
ReadTSC(r1);
repeat
t0:=round(8640000*time);
until t1<>t0;
repeat
t2:=round(8640000*time);
until t0<>t2;
ReadTSC(r2);
CPUFrequency := (r2 - r1) * 100 / (t2 - t1);
end;
{$endif}
{$else}
{16 bit compiler}
{$ifdef DPMI}
{---------------------------------------------------------------------------}
function Tick: byte;
begin
Tick := Mem[Seg0040:$6c];
end;
{$else}
var
tick: byte absolute $40:$6c;
{$endif}
{---------------------------------------------------------------------------}
procedure CalcCPUFrequency;
{-Calculate CPU frequency from 2 ticks}
var
t0,t1: byte;
Start, Stop: comp;
begin
t0 := tick;
repeat
t1:=tick;
until t1<>t0;
ReadTSC(Start);
repeat
t0:=tick;
until t1<>t0;
repeat
t1:=tick;
until t1<>t0;
ReadTSC(Stop);
CPUFrequency := (Stop-Start)*1193181/$20000;
end;
{$endif}
begin
{$ifdef D4Plus}
assert(sizeof(int64)=sizeof(comp), 'sizeof(int64)=sizeof(comp)');
{$endif}
{$ifdef CPUARM}
{This will give bogus frequency, do not use in applications}
CalcCPUFrequency;
if CPUFrequency<=0.0 then CPUFrequency := -1.0;
{$else}
if HasRDTSC then begin
CalcCPUFrequency;
if CPUFrequency<=0.0 then CPUFrequency := -1.0;
end
else begin
{$ifdef AUTOHALT}
halt(99);
{$endif}
end;
{$endif}
end.