ScopDetection: Make sure we do not accidentally divide by zero

This code path is likely never triggered, but by still handling this case
locally we avoid warnings in clangs static analyzer.

llvm-svn: 280939

diff --git a/polly/lib/Analysis/ScopDetection.cpp b/polly/lib/Analysis/ScopDetection.cpp
index 586beaf..b891c02 100644 (file)
--- a/polly/lib/Analysis/ScopDetection.cpp
+++ b/polly/lib/Analysis/ScopDetection.cpp
@@ -1307,6 +1307,9 @@ bool ScopDetection::hasSufficientCompute(DetectionContext &Context,
                                          int NumLoops) const {
   int InstCount = 0;
 
+  if (NumLoops == 0)
+    return false;
+
   for (auto *BB : Context.CurRegion.blocks())
     if (Context.CurRegion.contains(LI->getLoopFor(BB)))
       InstCount += BB->size();