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From: "Rod Pemberton" <do_not_have AT sorry DOT bitbucket DOT cmm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: application that retrieve the number of cpu cycle, junk 'cycle' after expression
Date: Tue, 7 Mar 2006 19:25:33 -0500
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"mames" <matteomamei AT yahoo DOT it> wrote in message
news:1141737752 DOT 454796 DOT 204020 AT v46g2000cwv DOT googlegroups DOT com...
> hi to everyone is the first time i write but i looking for an assembler
>
> problem and i don't manage to find a solution. i've found on internet
> an application that retrieve the number of cpu cycle. it's wrote in
> assembler and i don't manage to use its.
>
> double GetMachineCycleCount()
> {
>    double cycles;
>    __asm("cpuid");
>    __asm("rdtsc");
>    __asm("mov %ebx,OFFSET cycles");
>    __asm("mov ebx,%eax");
>    __asm("mov ebx+4,%edx");
>    return cycles;
> }
>
> when i compile the application (i'm using devc++) it notice me this
> error:
> error....junk 'cycle' after expression
>
> what is it mean?
> thanks a lot to everyone

(I didn't realize you were cross posted, so I'll post here too.)

I'm not familiar with devc++ (GCC based), but I am familiar with GAS(GCC)
and WASM.  It appears that you are mixing GAS and MASM style intructions.

For GAS (and hopefully devc++), it'd look more like this:

unsigned long long GetMachineCycleCount()
{
    unsigned long long cycles;
    __asm__ __volatile__(
                "cpuid\n"
                "rdtsc\n"
                :"=A"(cycles)
              );
    return cycles;
}

Notice that the returned type isn't 'double'.


Rod Pemberton