(GPGPU) cuda <-> OpenCL

• nvidia : cuda
• amd : openCL
• cuda -> openCL
• opencl zone : http://developer.amd.com/tools-and-sdks/opencl-zone/
• porting ref   : http://developer.amd.com/tools-and-sdks/opencl-zone/opencl-resources/programming-in-opencl/porting-cuda-applications-to-opencl/