1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
index 6dd5f6b..0f33559 100644
--- a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
@@ -310,7 +310,13 @@ bool LoopRotate::rotateLoop(Loop *L, bool SimplifiedLatch) {
                    L->dump());
         return Rotated;
       }
-      if (Metrics.NumInsts > MaxHeaderSize) {
+      if (!Metrics.NumInsts.isValid()) {
+        LLVM_DEBUG(dbgs() << "LoopRotation: NOT rotating - contains instructions"
+                   " with invalid cost: ";
+                   L->dump());
+        return Rotated;
+      }
+      if (*Metrics.NumInsts.getValue() > MaxHeaderSize) {
         LLVM_DEBUG(dbgs() << "LoopRotation: NOT rotating - contains "
                           << Metrics.NumInsts
                           << " instructions, which is more than the threshold ("