1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 3b46156c1ab..f62941fbf64 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -1467,6 +1467,11 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
         // normalized.
         if (SO1->getType() != GO1->getType())
           return nullptr;
+        // Only do the combine when GO1 and SO1 are both constants. Only in
+        // this case, we are sure the cost after the merge is never more than
+        // that before the merge.
+        if (!isa<Constant>(GO1) || !isa<Constant>(SO1))
+          return nullptr;
         Sum = Builder->CreateAdd(SO1, GO1, PtrOp->getName()+".sum");
       }