diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h b/llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h
index e86705e8988904..5d03b66b0ce335 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h
@@ -68,6 +68,9 @@ class VPBuilder {
 public:
   VPBuilder() = default;
   VPBuilder(VPBasicBlock *InsertBB) { setInsertPoint(InsertBB); }
+  VPBuilder(VPRecipeBase *InsertPt) {
+    setInsertPoint(InsertPt->getParent(), InsertPt->getIterator());
+  }
 
   /// Clear the insertion point: created instructions will not be inserted into
   /// a block.
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index f70ccf8270b214..2f56799a7b5186 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -1127,6 +1127,12 @@ class VPRecipeWithIRFlags : public VPSingleDefRecipe {
     return WrapFlags.HasNSW;
   }
 
+  bool isDisjoint() const {
+    assert(OpType == OperationType::DisjointOp &&
+           "recipe cannot have a disjoing flag");
+    return DisjointFlags.IsDisjoint;
+  }
+
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   void printFlags(raw_ostream &O) const;
 #endif
diff --git a/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h b/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
index aa253590694514..a03a408686ef13 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
+++ b/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
@@ -261,6 +261,11 @@ m_Mul(const Op0_t &Op0, const Op1_t &Op1) {
   return m_Binary<Instruction::Mul, Op0_t, Op1_t>(Op0, Op1);
 }
 
+template <typename Op0_t, typename Op1_t>
+inline AllBinaryRecipe_match<Op0_t, Op1_t, Instruction::Or>
+m_Or(const Op0_t &Op0, const Op1_t &Op1) {
+  return m_Binary<Instruction::Or, Op0_t, Op1_t>(Op0, Op1);
+}
 } // namespace VPlanPatternMatch
 } // namespace llvm
 
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index e6ab27a918bcec..006f4349d6fb91 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -1255,7 +1255,24 @@ void VPlanTransforms::dropPoisonGeneratingRecipes(
       // load/store. If the underlying instruction has poison-generating flags,
       // drop them directly.
       if (auto *RecWithFlags = dyn_cast<VPRecipeWithIRFlags>(CurRec)) {
-        RecWithFlags->dropPoisonGeneratingFlags();
+        VPValue *A, *B;
+        using namespace llvm::VPlanPatternMatch;
+        // Dropping disjoint from an OR may yield incorrect results, as some
+        // analysis may have converted it to an Add implicitly (e.g. SCEV used
+        // for dependence analysis). Instead, replace it with an equivalent Add.
+        // This is possible as all users of the disjoint OR only access lanes
+        // where the operands are disjoint or poison otherwise.
+        if (match(RecWithFlags, m_Or(m_VPValue(A), m_VPValue(B))) &&
+            RecWithFlags->isDisjoint()) {
+          VPBuilder Builder(RecWithFlags);
+          VPInstruction *New = Builder.createOverflowingOp(
+              Instruction::Add, {A, B}, {false, false},
+              RecWithFlags->getDebugLoc());
+          RecWithFlags->replaceAllUsesWith(New);
+          RecWithFlags->eraseFromParent();
+          CurRec = New;
+        } else
+          RecWithFlags->dropPoisonGeneratingFlags();
       } else {
         Instruction *Instr = dyn_cast_or_null<Instruction>(
             CurRec->getVPSingleValue()->getUnderlyingValue());
diff --git a/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll b/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll
index 14acb6f57aa0c9..3f38abc75a5837 100644
--- a/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll
+++ b/llvm/test/Transforms/LoopVectorize/X86/pr81872.ll
@@ -29,7 +29,7 @@ define void @test(ptr noundef align 8 dereferenceable_or_null(16) %arr) #0 {
 ; CHECK-NEXT:    [[TMP2:%.*]] = and <4 x i64> [[VEC_IND]], <i64 1, i64 1, i64 1, i64 1>
 ; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq <4 x i64> [[TMP2]], zeroinitializer
 ; CHECK-NEXT:    [[TMP4:%.*]] = select <4 x i1> [[TMP1]], <4 x i1> [[TMP3]], <4 x i1> zeroinitializer
-; CHECK-NEXT:    [[TMP5:%.*]] = or i64 [[TMP0]], 1
+; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[TMP0]], 1
 ; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr i64, ptr [[ARR]], i64 [[TMP5]]
 ; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr i64, ptr [[TMP6]], i32 0
 ; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr i64, ptr [[TMP7]], i32 -3