diff --git a/mlir/lib/Dialect/StandardOps/IR/Ops.cpp b/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
--- a/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
+++ b/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
@@ -1765,11 +1765,24 @@
 
 // Index cast is applicable from index to integer and backwards.
 bool IndexCastOp::areCastCompatible(Type a, Type b) {
+  if (a.isa<ShapedType>() && b.isa<ShapedType>()) {
+    auto aShaped = a.cast<ShapedType>();
+    auto bShaped = b.cast<ShapedType>();
+
+    return (aShaped.getShape() == bShaped.getShape()) &&
+           areCastCompatible(aShaped.getElementType(),
+                             bShaped.getElementType());
+  }
+
   return (a.isIndex() && b.isSignlessInteger()) ||
          (a.isSignlessInteger() && b.isIndex());
 }
 
 OpFoldResult IndexCastOp::fold(ArrayRef<Attribute> cstOperands) {
+  // Cast op does not change the type.
+  if (getOperand().getType() == getType())
+    return getOperand();
+
   // Fold IndexCast(IndexCast(x)) -> x
   auto cast = getOperand().getDefiningOp<IndexCastOp>();
   if (cast && cast.getOperand().getType() == getType())
diff --git a/mlir/test/Dialect/Standard/invalid.mlir b/mlir/test/Dialect/Standard/invalid.mlir
new file mode 100644
--- /dev/null
+++ b/mlir/test/Dialect/Standard/invalid.mlir
@@ -0,0 +1,17 @@
+// RUN: mlir-opt -split-input-file %s -verify-diagnostics
+
+// CHECK-LABEL: test_index_cast_shape_error
+func @test_index_cast_shape_error(%arg0 : tensor<index>) -> tensor<2xi64> {
+  // expected-error @+1 {{operand type 'tensor<index>' and result type 'tensor<2xi64>' are cast incompatible}}
+  %0 = index_cast %arg0 : tensor<index> to tensor<2xi64>
+  return %0 : tensor<2xi64>
+}
+
+// -----
+
+// CHECK-LABEL: test_index_cast_tensor_error
+func @test_index_cast_tensor_error(%arg0 : tensor<index>) -> i64 {
+  // expected-error @+1 {{operand type 'tensor<index>' and result type 'i64' are cast incompatible}}
+  %0 = index_cast %arg0 : tensor<index> to i64
+  return %0 : i64
+}
diff --git a/mlir/test/Dialect/Standard/ops.mlir b/mlir/test/Dialect/Standard/ops.mlir
new file mode 100644
--- /dev/null
+++ b/mlir/test/Dialect/Standard/ops.mlir
@@ -0,0 +1,24 @@
+// RUN: mlir-opt -split-input-file %s | mlir-opt | FileCheck %s
+// Verify the printed output can be parsed.
+// RUN: mlir-opt %s | mlir-opt | FileCheck %s
+// Verify the generic form can be parsed.
+// RUN: mlir-opt -mlir-print-op-generic %s | mlir-opt | FileCheck %s
+
+// CHECK-LABEL: test_index_cast
+func @test_index_cast(%arg0 : index) -> i64 {
+  %0 = index_cast %arg0 : index to i64
+  return %0 : i64
+}
+
+// CHECK-LABEL: test_index_cast_tensor
+func @test_index_cast_tensor(%arg0 : tensor<index>) -> tensor<i64> {
+  %0 = index_cast %arg0 : tensor<index> to tensor<i64>
+  return %0 : tensor<i64>
+}
+
+// CHECK-LABEL: test_index_cast_tensor_reverse
+func @test_index_cast_tensor_reverse(%arg0 : tensor<i64>) -> tensor<index> {
+  %0 = index_cast %arg0 : tensor<i64> to tensor<index>
+  return %0 : tensor<index>
+}
+