LogicalResult matchAndRewrite(ConstantOp op,
                                PatternRewriter& rewriter) const override {
    // 1. Collect quantizable ops.
    QuantizationUnits quantizable_ops = GetQuantizableOps(op);
    if (quantizable_ops.empty()) {
      return failure();
    }

    // 2. Quantize collected ops.
    if (!QuantizeOps(rewriter, op, quantizable_ops)) {
      return failure();
    }

  LogicalResult matchAndRewrite(arith::ConstantOp op,
                                PatternRewriter& rewriter) const override {
    QuantizationUnits quantizable_ops;

    // 1. Collect quantizable ops.
    if (!(getQuantizableOps(op, quantizable_ops))) {
      return failure();
    }

    // 2. Quantize collected ops. It is immediately quantized by inserting Q-DQ
    // pair for int8.

  LogicalResult matchAndRewrite(arith::ConstantOp op,
                                PatternRewriter& rewriter) const override {
    QuantizationUnits quantizable_ops;

    // 1. Collect quantizable ops.
    if (!(getQuantizableOps(op, quantizable_ops))) {
      return failure();
    }

    // 2. Quantize collected ops. It is immediately quantized by inserting Q-DQ