Automated specific instruction customization methodology for multimedia processor acceleration

To enhance the computing ability of the multimedia processor, this paper presents an automated specific instruction customization methodology. Specially, this methodology features a profiling stage which is equipped with a sub-graph matching algorithm. Furthermore, to support the features of multimedia systems, three special structures are integrated, such as fusion instructions, parallel and pipelining. To evaluate this methodology, a case study on H.264 encoder is adopted, and a H.264-JM8.0 system is built based on the Xtensa toolset from Tensilica Inc. We have verified it with a set of video benchmarks. The experimental results indicate that 67% enhancement can be obtained via specific instructions.