diff --git a/mlir/lib/Conversion/VectorToSCF/VectorToSCF.cpp b/mlir/lib/Conversion/VectorToSCF/VectorToSCF.cpp
--- a/mlir/lib/Conversion/VectorToSCF/VectorToSCF.cpp
+++ b/mlir/lib/Conversion/VectorToSCF/VectorToSCF.cpp
@@ -35,6 +35,8 @@
 #include "mlir/Pass/Pass.h"
 #include "mlir/Transforms/Passes.h"
 
+#define ALIGNMENT_SIZE 128
+
 using namespace mlir;
 using namespace mlir::edsc;
 using namespace mlir::edsc::intrinsics;
@@ -232,8 +234,8 @@
       op->getParentWithTrait<OpTrait::AutomaticAllocationScope>();
   assert(scope && "Expected op to be inside automatic allocation scope");
   b.setInsertionPointToStart(&scope->getRegion(0).front());
-  Value res =
-      std_alloca(memRefMinorVectorType, ValueRange{}, b.getI64IntegerAttr(128));
+  Value res = std_alloca(memRefMinorVectorType, ValueRange{},
+                         b.getI64IntegerAttr(ALIGNMENT_SIZE));
   return res;
 }
 
@@ -575,7 +577,8 @@
     steps.push_back(std_constant_index(step));
 
   // 2. Emit alloc-copy-load-dealloc.
-  Value tmp = std_alloc(tmpMemRefType(transfer));
+  Value tmp = std_alloc(tmpMemRefType(transfer), ValueRange{},
+                        rewriter.getI64IntegerAttr(ALIGNMENT_SIZE));
   StdIndexedValue local(tmp);
   Value vec = vector_type_cast(tmp);
   loopNestBuilder(lbs, ubs, steps, [&](ValueRange loopIvs) {
@@ -648,7 +651,8 @@
     steps.push_back(std_constant_index(step));
 
   // 2. Emit alloc-store-copy-dealloc.
-  Value tmp = std_alloc(tmpMemRefType(transfer));
+  Value tmp = std_alloc(tmpMemRefType(transfer), ValueRange{},
+                        rewriter.getI64IntegerAttr(ALIGNMENT_SIZE));
   StdIndexedValue local(tmp);
   Value vec = vector_type_cast(tmp);
   std_store(vectorValue, vec);
diff --git a/mlir/test/Conversion/VectorToSCF/vector-to-loops.mlir b/mlir/test/Conversion/VectorToSCF/vector-to-loops.mlir
--- a/mlir/test/Conversion/VectorToSCF/vector-to-loops.mlir
+++ b/mlir/test/Conversion/VectorToSCF/vector-to-loops.mlir
@@ -68,7 +68,7 @@
   // CHECK-NEXT:    affine.for %[[I1:.*]] = 0 to %{{.*}} {
   // CHECK-NEXT:      affine.for %[[I2:.*]] = 0 to %{{.*}} {
   // CHECK-NEXT:        affine.for %[[I3:.*]] = 0 to %{{.*}} step 5 {
-  //      CHECK:          %[[ALLOC:.*]] = alloc() : memref<5x4x3xf32>
+  //      CHECK:          %[[ALLOC:.*]] = alloc() {alignment = 128 : i64} : memref<5x4x3xf32>
   // CHECK-NEXT:          scf.for %[[I4:.*]] = %[[C0]] to %[[C3]] step %[[C1]] {
   // CHECK-NEXT:            scf.for %[[I5:.*]] = %[[C0]] to %[[C4]] step %[[C1]] {
   // CHECK-NEXT:              scf.for %[[I6:.*]] = %[[C0]] to %[[C5]] step %[[C1]] {
@@ -145,7 +145,7 @@
   // CHECK-NEXT:    affine.for %[[I1:.*]] = 0 to %{{.*}} step 4 {
   // CHECK-NEXT:      affine.for %[[I2:.*]] = 0 to %{{.*}} {
   // CHECK-NEXT:        affine.for %[[I3:.*]] = 0 to %{{.*}} step 5 {
-  // CHECK:               %[[ALLOC:.*]] = alloc() : memref<5x4x3xf32>
+  // CHECK:               %[[ALLOC:.*]] = alloc() {alignment = 128 : i64} : memref<5x4x3xf32>
   // CHECK-NEXT:          %[[VECTOR_VIEW:.*]] = vector.type_cast {{.*}} : memref<5x4x3xf32>
   //      CHECK:          store %{{.*}}, {{.*}} : memref<vector<5x4x3xf32>>
   // CHECK-NEXT:          scf.for %[[I4:.*]] = %[[C0]] to %[[C3]] step %[[C1]] {