check the predication in case of endless loop.

v2:
Add comment from ruiling:

or 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.

Signed-off-by: Luo <xionghu.luo@intel.com>
Reviewed-by: Ruiling Song <ruiling.song@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/backend/src/ir/structural_analysis.cpp b/backend/src/ir/structural_analysis.cpp
index 4c7e3d21..101570a3 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