diff --git a/mlir/integration_test/Dialect/LLVMIR/CPU/test-vector-reductions-fp.mlir b/mlir/integration_test/Dialect/LLVMIR/CPU/test-vector-reductions-fp.mlir
--- a/mlir/integration_test/Dialect/LLVMIR/CPU/test-vector-reductions-fp.mlir
+++ b/mlir/integration_test/Dialect/LLVMIR/CPU/test-vector-reductions-fp.mlir
@@ -42,24 +42,48 @@
     llvm.call @print_newline() : () -> ()
     // CHECK: 11
 
+    %add1r = "llvm.intr.experimental.vector.reduce.v2.fadd"(%0, %v)
+        {reassoc = true} : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
+    llvm.call @print_f32(%add1r) : (!llvm.float) -> ()
+    llvm.call @print_newline() : () -> ()
+    // CHECK: 11
+
     %add2 = "llvm.intr.experimental.vector.reduce.v2.fadd"(%1, %v)
         : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
     llvm.call @print_f32(%add2) : (!llvm.float) -> ()
     llvm.call @print_newline() : () -> ()
     // CHECK: 12
 
+    %add2r = "llvm.intr.experimental.vector.reduce.v2.fadd"(%1, %v)
+        {reassoc = true} : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
+    llvm.call @print_f32(%add2r) : (!llvm.float) -> ()
+    llvm.call @print_newline() : () -> ()
+    // CHECK: 12
+
     %mul1 = "llvm.intr.experimental.vector.reduce.v2.fmul"(%0, %v)
         : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
     llvm.call @print_f32(%mul1) : (!llvm.float) -> ()
     llvm.call @print_newline() : () -> ()
     // CHECK: 24
 
+    %mul1r = "llvm.intr.experimental.vector.reduce.v2.fmul"(%0, %v)
+        {reassoc = true} : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
+    llvm.call @print_f32(%mul1r) : (!llvm.float) -> ()
+    llvm.call @print_newline() : () -> ()
+    // CHECK: 24
+
     %mul2 = "llvm.intr.experimental.vector.reduce.v2.fmul"(%1, %v)
         : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
     llvm.call @print_f32(%mul2) : (!llvm.float) -> ()
     llvm.call @print_newline() : () -> ()
     // CHECK: 48
 
+    %mul2r = "llvm.intr.experimental.vector.reduce.v2.fmul"(%1, %v)
+        {reassoc = true} : (!llvm.float, !llvm<"<4 x float>">) -> !llvm.float
+    llvm.call @print_f32(%mul2r) : (!llvm.float) -> ()
+    llvm.call @print_newline() : () -> ()
+    // CHECK: 48
+
     llvm.return
   }
 }
diff --git a/mlir/integration_test/Dialect/Vector/CPU/test-reductions-f32-reassoc.mlir b/mlir/integration_test/Dialect/Vector/CPU/test-reductions-f32-reassoc.mlir
new file mode 100644
--- /dev/null
+++ b/mlir/integration_test/Dialect/Vector/CPU/test-reductions-f32-reassoc.mlir
@@ -0,0 +1,38 @@
+// RUN: mlir-opt %s -convert-scf-to-std \
+// RUN:             -convert-vector-to-llvm='reassociate-fp-reductions' \
+// RUN:             -convert-std-to-llvm | \
+// RUN: mlir-cpu-runner -e entry -entry-point-result=void  \
+// RUN:   -shared-libs=%mlir_integration_test_dir/libmlir_c_runner_utils%shlibext | \
+// RUN: FileCheck %s
+
+func @entry() {
+  // Construct test vector, numerically very stable.
+  %f1 = constant 1.0: f32
+  %f2 = constant 2.0: f32
+  %f3 = constant 3.0: f32
+  %v0 = vector.broadcast %f1 : f32 to vector<64xf32>
+  %v1 = vector.insert %f2, %v0[11] : f32 into vector<64xf32>
+  %v2 = vector.insert %f3, %v1[52] : f32 into vector<64xf32>
+  vector.print %v2 : vector<64xf32>
+  //
+  // test vector:
+  //
+  // CHECK: ( 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 )
+
+  // Various vector reductions. Not full functional unit tests, but
+  // a simple integration test to see if the code runs end-to-end.
+  %0 = vector.reduction "add", %v2 : vector<64xf32> into f32
+  vector.print %0 : f32
+  // CHECK: 67
+  %1 = vector.reduction "mul", %v2 : vector<64xf32> into f32
+  vector.print %1 : f32
+  // CHECK: 6
+  %2 = vector.reduction "min", %v2 : vector<64xf32> into f32
+  vector.print %2 : f32
+  // CHECK: 1
+  %3 = vector.reduction "max", %v2 : vector<64xf32> into f32
+  vector.print %3 : f32
+  // CHECK: 3
+
+  return
+}
diff --git a/mlir/integration_test/Dialect/Vector/CPU/test-reductions-f64-reassoc.mlir b/mlir/integration_test/Dialect/Vector/CPU/test-reductions-f64-reassoc.mlir
new file mode 100644
--- /dev/null
+++ b/mlir/integration_test/Dialect/Vector/CPU/test-reductions-f64-reassoc.mlir
@@ -0,0 +1,38 @@
+// RUN: mlir-opt %s -convert-scf-to-std \
+// RUN:             -convert-vector-to-llvm='reassociate-fp-reductions' \
+// RUN:             -convert-std-to-llvm | \
+// RUN: mlir-cpu-runner -e entry -entry-point-result=void  \
+// RUN:   -shared-libs=%mlir_integration_test_dir/libmlir_c_runner_utils%shlibext | \
+// RUN: FileCheck %s
+
+func @entry() {
+  // Construct test vector, numerically very stable.
+  %f1 = constant 1.0: f64
+  %f2 = constant 2.0: f64
+  %f3 = constant 3.0: f64
+  %v0 = vector.broadcast %f1 : f64 to vector<64xf64>
+  %v1 = vector.insert %f2, %v0[11] : f64 into vector<64xf64>
+  %v2 = vector.insert %f3, %v1[52] : f64 into vector<64xf64>
+  vector.print %v2 : vector<64xf64>
+  //
+  // test vector:
+  //
+  // CHECK: ( 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 )
+
+  // Various vector reductions. Not full functional unit tests, but
+  // a simple integration test to see if the code runs end-to-end.
+  %0 = vector.reduction "add", %v2 : vector<64xf64> into f64
+  vector.print %0 : f64
+  // CHECK: 67
+  %1 = vector.reduction "mul", %v2 : vector<64xf64> into f64
+  vector.print %1 : f64
+  // CHECK: 6
+  %2 = vector.reduction "min", %v2 : vector<64xf64> into f64
+  vector.print %2 : f64
+  // CHECK: 1
+  %3 = vector.reduction "max", %v2 : vector<64xf64> into f64
+  vector.print %3 : f64
+  // CHECK: 3
+
+  return
+}