diff --git a/mlir/include/mlir/Dialect/SparseTensor/Transforms/Passes.h b/mlir/include/mlir/Dialect/SparseTensor/Transforms/Passes.h
index 2e9c297f20182..212f7b6f13c26 100644
--- a/mlir/include/mlir/Dialect/SparseTensor/Transforms/Passes.h
+++ b/mlir/include/mlir/Dialect/SparseTensor/Transforms/Passes.h
@@ -13,10 +13,10 @@
 #ifndef MLIR_DIALECT_SPARSETENSOR_TRANSFORMS_PASSES_H_
 #define MLIR_DIALECT_SPARSETENSOR_TRANSFORMS_PASSES_H_
 
+#include "mlir/Dialect/Bufferization/Transforms/OneShotAnalysis.h"
 #include "mlir/IR/PatternMatch.h"
 #include "mlir/Pass/Pass.h"
 #include "mlir/Transforms/DialectConversion.h"
-#include "mlir/Transforms/OneToNTypeConversion.h"
 
 //===----------------------------------------------------------------------===//
 // Include the generated pass header (which needs some early definitions).
diff --git a/mlir/lib/Dialect/SparseTensor/Pipelines/SparseTensorPipelines.cpp b/mlir/lib/Dialect/SparseTensor/Pipelines/SparseTensorPipelines.cpp
index 887ab1d40caba..018233dc767b4 100644
--- a/mlir/lib/Dialect/SparseTensor/Pipelines/SparseTensorPipelines.cpp
+++ b/mlir/lib/Dialect/SparseTensor/Pipelines/SparseTensorPipelines.cpp
@@ -6,23 +6,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "mlir/Dialect/SparseTensor/Pipelines/Passes.h"
-
-#include "mlir/Conversion/ArithToLLVM/ArithToLLVM.h"
-#include "mlir/Conversion/ControlFlowToLLVM/ControlFlowToLLVM.h"
-#include "mlir/Conversion/GPUToNVVM/GPUToNVVMPass.h"
 #include "mlir/Conversion/Passes.h"
 #include "mlir/Dialect/Arith/Transforms/Passes.h"
-#include "mlir/Dialect/Bufferization/Transforms/Bufferize.h"
-#include "mlir/Dialect/Bufferization/Transforms/OneShotAnalysis.h"
 #include "mlir/Dialect/Bufferization/Transforms/Passes.h"
 #include "mlir/Dialect/Func/IR/FuncOps.h"
 #include "mlir/Dialect/GPU/IR/GPUDialect.h"
 #include "mlir/Dialect/GPU/Transforms/Passes.h"
-#include "mlir/Dialect/LLVMIR/NVVMDialect.h"
 #include "mlir/Dialect/Linalg/Passes.h"
 #include "mlir/Dialect/MemRef/Transforms/Passes.h"
-#include "mlir/Dialect/SparseTensor/IR/SparseTensor.h"
+#include "mlir/Dialect/SparseTensor/Pipelines/Passes.h"
 #include "mlir/Dialect/SparseTensor/Transforms/Passes.h"
 #include "mlir/Pass/PassManager.h"
 #include "mlir/Transforms/Passes.h"
@@ -107,6 +99,9 @@ void mlir::sparse_tensor::buildSparsifier(OpPassManager &pm,
     pm.addPass(createGpuModuleToBinaryPass(gpuModuleToBinaryPassOptions));
   }
 
+  // Convert poison values.
+  pm.addPass(createUBToLLVMConversionPass());
+
   // Ensure all casts are realized.
   pm.addPass(createReconcileUnrealizedCastsPass());
 }
diff --git a/mlir/test/Integration/Dialect/Vector/CPU/shuffle16x16.mlir b/mlir/test/Integration/Dialect/Vector/CPU/shuffle16x16.mlir
index 03bc2b5123c48..33a76b13c245a 100644
--- a/mlir/test/Integration/Dialect/Vector/CPU/shuffle16x16.mlir
+++ b/mlir/test/Integration/Dialect/Vector/CPU/shuffle16x16.mlir
@@ -1,7 +1,9 @@
 // RUN: mlir-opt %s -convert-vector-to-scf -convert-scf-to-cf \
 // RUN:   -transform-interpreter \
 // RUN:   -test-transform-dialect-erase-schedule \
-// RUN:   -convert-vector-to-llvm -convert-func-to-llvm -convert-arith-to-llvm -convert-cf-to-llvm -reconcile-unrealized-casts | \
+// RUN:   -convert-vector-to-llvm -convert-func-to-llvm \
+// RUN:   -convert-arith-to-llvm -convert-cf-to-llvm \
+// RUN:   -convert-ub-to-llvm -reconcile-unrealized-casts | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
diff --git a/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-1d.mlir b/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-1d.mlir
index c4222a744f0a9..2393bd1c79dea 100644
--- a/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-1d.mlir
+++ b/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-1d.mlir
@@ -1,9 +1,9 @@
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,expand-strided-metadata,lower-affine,convert-arith-to-llvm,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,expand-strided-metadata,lower-affine,convert-arith-to-llvm,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-ub-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
 
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},expand-strided-metadata,lower-affine,convert-arith-to-llvm,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},expand-strided-metadata,lower-affine,convert-arith-to-llvm,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-ub-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
diff --git a/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-2d.mlir b/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-2d.mlir
index 61e25c2dee732..009c1375beaab 100644
--- a/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-2d.mlir
+++ b/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-2d.mlir
@@ -1,9 +1,9 @@
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,convert-ub-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
 
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,convert-ub-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
diff --git a/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-3d.mlir b/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-3d.mlir
index 6c120d1b28c38..d41d9c93bc2b3 100644
--- a/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-3d.mlir
+++ b/mlir/test/Integration/Dialect/Vector/CPU/transfer-read-3d.mlir
@@ -1,9 +1,9 @@
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,convert-ub-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
 
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,convert-ub-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e entry -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_c_runner_utils | \
 // RUN: FileCheck %s
diff --git a/mlir/test/Integration/Dialect/Vector/CPU/transfer-to-loops.mlir b/mlir/test/Integration/Dialect/Vector/CPU/transfer-to-loops.mlir
index 1e74bc72e5b7f..a7fec69b69492 100644
--- a/mlir/test/Integration/Dialect/Vector/CPU/transfer-to-loops.mlir
+++ b/mlir/test/Integration/Dialect/Vector/CPU/transfer-to-loops.mlir
@@ -1,9 +1,9 @@
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf,lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,convert-ub-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e main -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_runner_utils,%mlir_c_runner_utils | \
 // RUN: FileCheck %s
 
-// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,reconcile-unrealized-casts)" | \
+// RUN: mlir-opt %s -pass-pipeline="builtin.module(func.func(convert-vector-to-scf{full-unroll=true},lower-affine,convert-scf-to-cf),convert-vector-to-llvm,finalize-memref-to-llvm,convert-func-to-llvm,convert-arith-to-llvm,convert-cf-to-llvm,convert-ub-to-llvm,reconcile-unrealized-casts)" | \
 // RUN: mlir-runner -e main -entry-point-result=void  \
 // RUN:   -shared-libs=%mlir_runner_utils,%mlir_c_runner_utils | \
 // RUN: FileCheck %s
diff --git a/mlir/test/lib/Conversion/ConvertToSPIRV/TestSPIRVVectorUnrolling.cpp b/mlir/test/lib/Conversion/ConvertToSPIRV/TestSPIRVVectorUnrolling.cpp
index 0bad43d5214b1..85245ea50782d 100644
--- a/mlir/test/lib/Conversion/ConvertToSPIRV/TestSPIRVVectorUnrolling.cpp
+++ b/mlir/test/lib/Conversion/ConvertToSPIRV/TestSPIRVVectorUnrolling.cpp
@@ -6,15 +6,12 @@
 //
 //===-------------------------------------------------------------------===//
 
-#include "mlir/Dialect/Arith/IR/Arith.h"
-#include "mlir/Dialect/Func/IR/FuncOps.h"
 #include "mlir/Dialect/SPIRV/IR/SPIRVDialect.h"
 #include "mlir/Dialect/SPIRV/Transforms/SPIRVConversion.h"
+#include "mlir/Dialect/UB/IR/UBOps.h"
 #include "mlir/Dialect/Vector/IR/VectorOps.h"
-#include "mlir/Dialect/Vector/Transforms/LoweringPatterns.h"
 #include "mlir/Pass/Pass.h"
 #include "mlir/Pass/PassManager.h"
-#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
 
 namespace mlir {
 namespace {
@@ -30,7 +27,8 @@ struct TestSPIRVVectorUnrolling final
   }
 
   void getDependentDialects(DialectRegistry &registry) const override {
-    registry.insert<spirv::SPIRVDialect, vector::VectorDialect>();
+    registry
+        .insert<spirv::SPIRVDialect, vector::VectorDialect, ub::UBDialect>();
   }
 
   void runOnOperation() override {
diff --git a/mlir/test/lib/Dialect/LLVM/TestLowerToLLVM.cpp b/mlir/test/lib/Dialect/LLVM/TestLowerToLLVM.cpp
index 253748eb79ae1..fca58b6a17062 100644
--- a/mlir/test/lib/Dialect/LLVM/TestLowerToLLVM.cpp
+++ b/mlir/test/lib/Dialect/LLVM/TestLowerToLLVM.cpp
@@ -20,14 +20,12 @@
 #include "mlir/Conversion/MemRefToLLVM/MemRefToLLVM.h"
 #include "mlir/Conversion/ReconcileUnrealizedCasts/ReconcileUnrealizedCasts.h"
 #include "mlir/Conversion/SCFToControlFlow/SCFToControlFlow.h"
+#include "mlir/Conversion/UBToLLVM/UBToLLVM.h"
 #include "mlir/Conversion/VectorToLLVM/ConvertVectorToLLVMPass.h"
 #include "mlir/Conversion/VectorToSCF/VectorToSCF.h"
 #include "mlir/Dialect/Func/IR/FuncOps.h"
-#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
 #include "mlir/Dialect/Linalg/Passes.h"
 #include "mlir/Dialect/MemRef/Transforms/Passes.h"
-#include "mlir/IR/DialectRegistry.h"
-#include "mlir/Pass/Pass.h"
 #include "mlir/Pass/PassManager.h"
 #include "mlir/Pass/PassOptions.h"
 #include "mlir/Transforms/Passes.h"
@@ -81,6 +79,8 @@ void buildTestLowerToLLVM(OpPassManager &pm,
   pm.addPass(createConvertControlFlowToLLVMPass());
   // Convert Index to LLVM (always needed).
   pm.addPass(createConvertIndexToLLVMPass());
+  // Convert UB to LLVM (always needed).
+  pm.addPass(createUBToLLVMConversionPass());
   // Convert remaining unrealized_casts (always needed).
   pm.addPass(createReconcileUnrealizedCastsPass());
 }