[Beignet] [PATCH] check the predication in case of endless loop.

[Zhigang Gong]

Pushed, and add ruiling's comment to the commit log.

On Wed, Jan 28, 2015 at 02:02:56AM +0000, Song, Ruiling wrote:
> LGTM, For dead loop, it has an unconditional branch at its end. Simply do not treat it as a loop is also acceptable.
> I ran into this problem when I execute ./opencv_test_imgproc --gtest_filter=OCL_Imgproc/HoughLines.RealImage/0
> And it fix the problem.
> 
> 
> > -----Original Message-----
> > From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> > xionghu.luo at intel.com
> > Sent: Wednesday, January 28, 2015 9:24 AM
> > To: beignet at lists.freedesktop.org
> > Cc: Luo, Xionghu
> > Subject: [Beignet] [PATCH] check the predication in case of endless loop.
> > 
> > From: Luo <xionghu.luo at intel.com>
> > 
> > Signed-off-by: Luo <xionghu.luo at intel.com>
> > ---
> >  backend/src/ir/structural_analysis.cpp | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/backend/src/ir/structural_analysis.cpp
> > b/backend/src/ir/structural_analysis.cpp
> > index 4c7e3d2..101570a 100644
> > --- a/backend/src/ir/structural_analysis.cpp
> > +++ b/backend/src/ir/structural_analysis.cpp
> > @@ -67,6 +67,11 @@ namespace analysis
> >      if (pbb->hasExtraBra)
> >        it--;
> >      ir::BranchInstruction* pinsn = static_cast<ir::BranchInstruction
> > *>(&*it);
> > +
> > +    if(!pinsn->isPredicated()){
> > +      std::cout << "WARNING:" << "endless loop detected!" << std::endl;
> > +      return;
> > +    }
> >      ir::Register reg = pinsn->getPredicateIndex();
> >      /* since this node is an while node, so we remove the BRA instruction
> > at the bottom of the exit BB of 'node',
> >       * and insert WHILE instead
> > --
> > 1.9.1
> > 
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