Could the signed 8*8 multiplier work?

Hi, my name is John.
Thank for your opening source. In your code, the quantization of weight and activation are both UINT8[0, 255] , so unsigned 8*8 multipilers are used. If I would like to quantize the weight and activation to [-127, 127], using the signed 8*8 multipliers, how to adjust the code could achieve the aim？Thanks again.