diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -23498,6 +23498,16 @@
       return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), Subvec);
   }
 
+  // fold vecreduce_or/and(splat_vector(val)) -> constant val
+  // fold vecreduce_xor(splat_vector(val)) -> constant zero
+  APInt SplatVal;
+  if (ISD::isConstantSplatVector(N0.getNode(), SplatVal)) {
+    if (Opcode == ISD::VECREDUCE_XOR)
+      return DAG.getConstant(0, SDLoc(N), N->getValueType(0));
+    if (Opcode == ISD::VECREDUCE_AND || Opcode == ISD::VECREDUCE_OR)
+      return DAG.getConstant(SplatVal, SDLoc(N), N->getValueType(0));
+  }
+
   return SDValue();
 }