[Olsr-dev] olsr strange behaving / nearly no outgoing packets [partly solved]

[Henning Rogge]

On 08/12/2012 09:41 PM, Lars Kruse wrote:
> Hi Ferry,
>
> thanks for taking a look at it!
>
>> does this line fix it?
>>>    return (tv.tv_sec - first_tv.tv_sec) * (__time_t)1000 + (tv.tv_usec -
>>> first_tv.tv_usec) / (__suseconds_t)1000;
>
> sadly no - this does not fix the problem :(
>
> To me it feels like this is a compiler problem, or? (works without -Os)
> Could someone give me some specific hints how to get the machine code for the
> line above? This would probably help us to understand the source of the problem.

This feels like a compiler problem.

> Besides this approach I don't see any other options for further investigations.
> Or what would you say?

Maybe we could just add a new variable and calculate the return value in 
two steps. Most compilers should optimize the variable away anyways.

uint32_t ms;

....

t = (tv.tv_sec  - first_tv.tv_sec)  * 1000;
ms = (tv.tv_usec - first_tv.tv_usec) / 1000;

return t + ms;
}

Does this help ?

Henning Rogge

-- 
Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für
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