1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
index 8d94454b092..b7a73326b85 100644
--- a/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
@@ -568,6 +568,7 @@ MachineInstrBuilder MachineIRBuilder::buildMerge(const DstOp &Res,
   // we need some temporary storage for the DstOp objects. Here we use a
   // sufficiently large SmallVector to not go through the heap.
   SmallVector<SrcOp, 8> TmpVec(Ops.begin(), Ops.end());
+  assert(TmpVec.size() > 1);
   return buildInstr(TargetOpcode::G_MERGE_VALUES, Res, TmpVec);
 }
 
@@ -577,6 +578,7 @@ MachineInstrBuilder MachineIRBuilder::buildUnmerge(ArrayRef<LLT> Res,
   // we need some temporary storage for the DstOp objects. Here we use a
   // sufficiently large SmallVector to not go through the heap.
   SmallVector<DstOp, 8> TmpVec(Res.begin(), Res.end());
+  assert(TmpVec.size() > 1);
   return buildInstr(TargetOpcode::G_UNMERGE_VALUES, TmpVec, Op);
 }
 
@@ -595,6 +597,7 @@ MachineInstrBuilder MachineIRBuilder::buildUnmerge(ArrayRef<Register> Res,
   // we need some temporary storage for the DstOp objects. Here we use a
   // sufficiently large SmallVector to not go through the heap.
   SmallVector<DstOp, 8> TmpVec(Res.begin(), Res.end());
+  assert(TmpVec.size() > 1);
   return buildInstr(TargetOpcode::G_UNMERGE_VALUES, TmpVec, Op);
 }