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2010 Jan 05
1
[LLVMdev] Help adding the Bullet physics sdk benchmark to the LLVM test suite?
Hi Anton, and happy new year all,
>>One questions though: is it possible to "verify" the results of all
>>the computations somehow?
Good point, and there is no automated way currently, but we can work on
that.
Note that simulation suffers from the 'butterfly effect', so the smallest
change anywhere,
(cpu, compiler etc) diverges into totally different results after a
2010 Jan 05
4
[LLVMdev] Help adding the Bullet physics sdk benchmark to the LLVM test suite?
...e.
>
> Perhaps LLVM needs a flag to disable sometimes undesireable
> transformations.
> Like anything involving floating-point calculations. Compiler changes
> should
> not affect codes so horribly unless the user tells them to. :) The Cray
> compiler provides various -Ofp (-Ofp0, -Ofp1, etc.) levels for this very
> reason.
>
> > There are a few ways of verification I can think of:
> >
> > 1) verifying by adding unit tests for all stages in the physics pipeline
> > (broadphase acceleration structures, closest point computation,
> constraint...