On 05/15/2014 09:51 AM, Michael Van Canneyt wrote:
Of course in the end I need something that works for any CPU and OS.
There is nothing. EpikTimer pretends to fill this gap, but it does not.
Yep.
If necessary I could try to do something myself (i.e. an improved
version of fpgettimeofday), with alternative {$if -ed implementations
for different settings of the arch and OS settings. But thoroughly
testing this seems like a nightmare.
Don't get me wrong: I have nothing against the epiktimer, but it is
presented as some super cross-platform solution (or so I perceive it).
Which is simply not correct. Unless you use the i386 version of the
compiler, it is not better than using now().
In fact in Linux it does call fpgettimeofday() (or did I install an old
version ? )
At best, fpgettimeofday itself should be improved (maybe using
"Performance counter" register if the Arch allows for or vDSO if the
OS allows for).
FYI: fpgettimeofday is a direct kernel call, there is nothing to improve.
I do know (I did ASM stepping), but it does not need to stay that way.
(Or maybe there is a platform independent function in the RTL that is
used to delegate to fpgettimeofday)
If the arch and OS allows for it could work differently (e.g. use vDSO
or use a performance counter register, adding value calculated an
initializing action.
-Michael
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