auto narrow_range = op.getNarrowRange();
    const double bits_min = narrow_range ? 1 : 0;
    const double bits_max = (1 << num_bits) - 1;

    auto float_min = op.getMin();
    auto float_max = op.getMax();

    auto float_diff = rewriter.create<SubOp>(op.getLoc(), float_max, float_min);

    // Compute the range when quantized.
    auto quant_min = rewriter.create<ConstOp>(