Is there some reason that gethrtime() isn't sufficient?
Second, why do you care about sparcv8? Do you need to link to 32-bit
programs? Or do you *really* need sparcv8? (There are ways to use
Solaris sparcv8plus instructions in a sparcv8 linked program, btw. But
simpler to just link sparcv8plus if you need 32-bit support on a sparcv9
processor.)
-- Garrett
Fabrizio Bertocci wrote:
> Hi everyone,
> I have two questions for the Solaris experts here, both related to
> finding the right way to read the real-time clock from my application
> (running in user's space).
>
> Bottom line is that I need to have a 'rdtsc()' function available on
> Sparc. Currently my
> 'rdtsc()' function works on Intel/AMD platforms and simply executes the
> processor's 'rdtsc' instruction to return a 64-bit integer with the
> number of clock tick since power up.
>
> The IA32 version of rdtsc() is:
>
> inline unsigned long long HiresTimer::rdtsc() {
> unsigned long long x;
> asm volatile(
> "rdtsc \n\t"
> : "=A" (x));
> return x;
> }
>
>
> The IA64 version is:
>
> inline unsigned long long HiresTimer::rdtsc() {
> unsigned long high, low;
> asm volatile(
> "rdtsc \n\t"
> : "=a" (low),
> "=d" (high));
> return ((unsigned long long)high << 32) | (low);
> }
>
> The above code works perfectly on Solaris 10 on x86 with gcc (3.4.x
> and 4.1.x).
>
> For the Solaris on Sparc, I was able to get this to work on a sparcv9
> system:
>
> inline unsigned long long HiresTimer::rdtsc() {
> unsigned long long tickreg;
> asm ("rd %%tick, %0" : "=r" (tickreg));
> return tickreg;
> }
>
> (still with gcc).
>
> Question #1: Is there a way I can do the same thing on a Sparcv8 system?
> Does sparcv8 has the 'tick' register at all or the 'tick' register
> was introduced only on newer architectures?
>
> Problem #2: How can I do a similar thing with Sun's CC compiler? The
> 'asm' sections are valid only for gcc and I'm not very familiar with
> Sun's CC.
>
> Thank you in advance for any help you can give me.
>
> Fabrizio Bertocci
>
>
> _______________________________________________
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> opensolaris-code@opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/opensolaris-code
>
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