[llvm] r278616 - [IRCE] Add better DEBUG diagnostic; NFC

[Sanjoy Das via llvm-commits]

Author: sanjoy
Date: Sat Aug 13 20:04:31 2016
New Revision: 278616

URL: http://llvm.org/viewvc/llvm-project?rev=278616&view=rev
Log:
[IRCE] Add better DEBUG diagnostic; NFC

NFC meaning IRCE should not _do_ anything different, but
-debug-only=irce will be a little friendlier.

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

Modified: llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp?rev=278616&r1=278615&r2=278616&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp Sat Aug 13 20:04:31 2016
@@ -622,8 +622,10 @@ static bool CanBeSMin(ScalarEvolution &S
 Optional<LoopStructure>
 LoopStructure::parseLoopStructure(ScalarEvolution &SE, BranchProbabilityInfo &BPI,
                                   Loop &L, const char *&FailureReason) {
-  if (!L.isLoopSimplifyForm())
+  if (!L.isLoopSimplifyForm()) {
+    FailureReason = "loop not in LoopSimplify form";
     return None;
+  }
 
   BasicBlock *Latch = L.getLoopLatch();
   assert(Latch && "Simplified loops only have one latch!");