Acceleration is only some part of what FPGA do. But it sounds like you imply it is the only purpose of FPGA, it is far from it. How GPU are used in chip prototy

Acceleration is only some part of what FPGA do. But it sounds like you imply it is the only purpose of FPGA, it is far from it. How GPU are used in chip prototyping? Or in safety critical designs? Can GPU implement fast proprietary interface or protocol parsing?