[llvm] r303544 - [LoopPredication] NFC. Add extra debug output in case we fail to parse the range check

[Artur Pilipenko via llvm-commits]

Author: apilipenko
Date: Mon May 22 07:06:57 2017
New Revision: 303544

URL: http://llvm.org/viewvc/llvm-project?rev=303544&view=rev
Log:
[LoopPredication] NFC. Add extra debug output in case we fail to parse the range check

Modified:
    llvm/trunk/lib/Transforms/Scalar/LoopPredication.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/LoopPredication.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopPredication.cpp?rev=303544&r1=303543&r2=303544&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopPredication.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopPredication.cpp Mon May 22 07:06:57 2017
@@ -182,8 +182,10 @@ Optional<Value *> LoopPredication::widen
   DEBUG(ICI->dump());
 
   auto RangeCheck = parseLoopICmp(ICI);
-  if (!RangeCheck)
+  if (!RangeCheck) {
+    DEBUG(dbgs() << "Failed to parse the loop latch condition!\n");
     return None;
+  }
 
   ICmpInst::Predicate Pred = RangeCheck->Pred;
   const SCEVAddRecExpr *IndexAR = RangeCheck->IV;