OpenGL ESSL optimizing compiler for embedded 3D graphic processor

Recently, graphic processing unit (GPU) becomes a mandatory component in mobile consumer devices such mobile phones. The vertex and fragment shader programs in embedded GPU are programmed with embedded system shading language(ESSL). The shader compiler for ESSL should be designed considering several distinct features of ESSL and GPU. In this paper, we present ESSL compiler techniques for embedded GPU. The compiler can optimize the code and data memory size as well as improve the performance of shader code by fully exploiting the special architecture of target GPU. Experiments show that the proposed optimization techniques can reduce the code size by up to 10.3% and the execution cycles by up to 16.8%.