[llvm] [VectorCombine] Scalarize bin ops and cmps with two splatted operands (PR #137786)

[Min-Yih Hsu via llvm-commits]

================
@@ -1134,12 +1149,16 @@ bool VectorCombine::scalarizeBinopOrCmp(Instruction &I) {
   if (auto *ScalarInst = dyn_cast<Instruction>(Scalar))
     ScalarInst->copyIRFlags(&I);
 
-  // Fold the vector constants in the original vectors into a new base vector.
-  Value *NewVecC =
-      IsCmp ? Builder.CreateCmp(Pred, VecC0, VecC1)
-            : Builder.CreateBinOp((Instruction::BinaryOps)Opcode, VecC0, VecC1);
-  Value *Insert = Builder.CreateInsertElement(NewVecC, Scalar, Index);
-  replaceValue(I, *Insert);
+  Value *Result;
+  if (Index) {
+    // Fold the vector constants in the original vectors into a new base vector.
+    Value *NewVecC = IsCmp ? Builder.CreateCmp(Pred, VecC0, VecC1)
+                           : Builder.CreateBinOp((Instruction::BinaryOps)Opcode,
+                                                 VecC0, VecC1);
+    Result = Builder.CreateInsertElement(NewVecC, Scalar, *Index);
+  } else
----------------
mshockwave wrote:

matching curly braces

https://github.com/llvm/llvm-project/pull/137786