From:	Gero Timann <geti AT mcis DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: millisecond in C++
Date:	Tue, 13 Oct 1998 20:23:19 +0100
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Hi !

If you have a Pentium or above, you can also use the CPU-build-in time
stamp counter. Counts with CPU-clock ! Reading TSC can look like this:

------------------------------------------------------------------------
// Read TimeStampCounter in double-format
// Offset is 2.0, price for simple conversion routine
extern void RDTSC(double *dst);
#define RDTSC(_dst)\
__asm__("
    rdtsc
    movl %%eax,(%%edi)
    orl  $1073741824,%%edx
    movl %%edx,4(%%edi)"\
: : "D" (_dst) : "eax", "edx", "edi");
------------------------------------------------------------------------

You can also count events, like floating point operations or memory
reads, with a mechanism similar to the above. If you are interessted
in a c-module, please send me a mail.




Regards,
Gero


Wojciech Piechowski schrieb:

> On Mon, 12 Oct 1998, Edouard Laroche-Joubert wrote:
>
> > I need to get the elapsed time between two steps and I only found how to get
> > it in seconds but it's too long !
> >
> >     Is theire a way to get it in milliseconds or microseconds ?
>
> Use uclock()
>
> --------------------\  Wojciech  Piechowski  /----------------------------
> Student informatyki   \ voyt AT ds2 DOT pg DOT gda DOT pl /   Student of computer science
> Politechnika Gdanska    \________________/  Technical University of Gdansk



--
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Dipl.Phys.Gero Timann
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37081 Göttingen
Germany

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