func.func @main(%arg0: tensor<f32>) {
      %elem = "tf.Const"() <{value = dense<0.000000e+00> : tensor<f32>}> : () -> tensor<f32>
      %shape = "tf.Const"() <{value = dense<> : tensor<0xi64>}> : () -> tensor<0xi64>
      %zero = "tf.Fill"(%shape, %elem) : (tensor<0xi64>, tensor<f32>) -> tensor<f32>
      tf_device.replicate([%arg0, %zero] as %arg1: tensor<f32>) {n = 2 : i32} {
        %arg1_id = "tf_device.launch"() <{device = "TPU_REPLICATED_HOST_0"}> ({

  %7 = "mhlo.broadcast_in_dim"(%3) <{broadcast_dimensions = dense<3> : tensor<1xi64>}> : (tensor<5xf32>) -> tensor<32x28x28x5xf32>
  %8 = mhlo.add %6, %7 : tensor<32x28x28x5xf32>
  %9 = mhlo.maximum %8, %1 : tensor<32x28x28x5xf32>
  %10 = "mhlo.reshape"(%9) : (tensor<32x28x28x5xf32>) -> tensor<32x3920xf32>

using ::xla::XlaComputation;
using ::xla::XlaOp;

static constexpr char kMlirModuleStr[] = R"(
module attributes {tf.versions = {bad_consumers = [], min_consumer = 0 : i32, producer = 1442 : i32}} {

  %2 = "tf.LookupTableFindV2"(%0, %arg, %default) {device = "/CPU:0"} : (tensor<!tf_type.resource>, tensor<?x!tf_type.string>, tensor<i64>) -> tensor<*xi64>
  func.return %1, %2 : tensor<i64>, tensor<*xi64>
}

}

// -----

module attributes {tf_saved_model.semantics} {

// Test hoisting const op.

// CHECK-LABEL: func @_tfrt_resource_init

//        limit_indices = dense<[4, 1]> : tensor<2xi64>,
//        start_indices = dense<0> : tensor<2xi64>,
//        strides = dense<1> : tensor<2xi64>} :
//        (tensor<4x6xf32>) -> tensor<4x1xf32>
// %1 = "mhlo.slice"(%input) {
//        limit_indices = dense<[4, 3]> : tensor<2xi64>,
//        start_indices = dense<[0, 1]> : tensor<2xi64>,
//        strides = dense<1> : tensor<2xi64>} :
//        (tensor<4x6xf32>) -> tensor<4x2xf32>

//     -> tensor<5x2xf32>
//
// is lowered to
//
//   %shape = "tf.Const"() {value = dense<[-1, 2]> : tensor<2xi64>}
//   %inp0 = "tf.Reshape"(%arg0, %shape)
//     : (tensor<2xf32>, tensor<2xi64>) -> tensor<1x2xf32>
//   %inp1 = "tf.Reshape"(%arg1, %shape)
//     : (tensor<2x2x2xf32>, tensor<2xi64>) -> tensor<4x2xf32>
//   %items0 = "tf.Unpack"(%[[INP0]]) {axis = 0 : i64}
//     : (tensor<1x2xf32>) -> tensor<2xf32>

      while (auto cast_op =
                 llvm::dyn_cast_or_null<CastOp>(value.getDefiningOp())) {
        // Consider cast compatibility in case
        //    %cast = "tf.Cast"(%0) : (tensor<2xi64>) -> tensor<2xf32>
        // is skipped.
        if (cast_op.getSrcT() != cast_op.getDstT()) {
          break;
        }
        value = cast_op.getOperand();
      }
      return value;
    };

    SmallVector<Value> start_indices(rank);
    for (auto [i, start_index] : llvm::enumerate(op.getStartIndices())) {
      // Start indices should be casted from tensor<i64> to tensor<1xi64>.
      auto cast = rewriter.create<TFL::BitcastOp>(
          op->getLoc(), single_element_type, start_index);
      int64_t upper_limit_idx = operand_shape[i] - slice_sizes[i];
      auto upper_limit_attr =

// For example,
//
//   %0 = tf.Pack(%input) {axis = 0} // %input : tensor<2x3xf32>
//
// can be canonicalized to
//
//   %shape = "tf.Const"() {value = dense<[1, 2, 3]> : tensor<3xi64>}
//   %0 = tf.Reshape(%input, %shape)
struct ConvertPackToReshape : public OpRewritePattern<PackOp> {
  using OpRewritePattern<PackOp>::OpRewritePattern;

  LogicalResult matchAndRewrite(PackOp pack_op,