[Piglit] [PATCH] arb_shader_clock: add basic execution tests

[Ilia Mirkin]

On Thu, Mar 30, 2017 at 8:19 AM, Nicolai Hähnle <nhaehnle at gmail.com> wrote:
> On 30.03.2017 14:07, Ilia Mirkin wrote:
>>
>> Time could roll over... not sure what to do about that though. Maybe
>> check if the top 2 bits are set in the old value and are unset in the
>> new value, and hope that the counter precision > 2 bits? [It'd be
>> unfortunate for CIs to get occasional failures in these tests...]
>
>
> Shouldn't roll-over be covered by the cast to int followed by comparison
> with 0?

Let's say start_time == 0xfffffffffffffff, late_time = 0. Perhaps I'm
getting the math wrong here, but as far as I can see, that test will
fail.

  -ilia