1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index baef7b9a196..8cdfb3ad3f8 100644
--- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1119,6 +1119,13 @@ void Cost::RateRegister(const SCEV *Reg,
       if (isExistingPhi(AR, SE))
         return;
 
+      // It is bad to allow LSR for current loop to add induction variables
+      // for its sibling loops.
+      if (!AR->getLoop()->contains(L)) {
+        Lose();
+        return;
+      }
+
       // Otherwise, it will be an invariant with respect to Loop L.
       ++NumRegs;
       return;