[cairo] Reading rdtsc on x86_64

Soeren Sandmann sandmann at daimi.au.dk
Fri Sep 12 01:35:41 PDT 2008

M Joonas Pihlaja <jpihlaja at cc.helsinki.fi> writes:

> The oil_profile_stamp_rdtsc() function uses the =A mode to read
> the 64 bit result of rdtsc on both x86 and x86_64.  This doesn't
> work on x86_64 reliably as we want to be reading eax:edx, but
> with =A we're reading a single 64 bit register instead.
> I've been using the attached patch at home.  Someone look it
> over?

Looks good to me - in fact, I don't see any reason it wouldn't also
work on x86-32, so it could probably simply replace the old one.


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