I am a computer scientist who loves exploring compilers, operating system kernels, and browsers. I am currently working as a Research Fellow at The University of Auckland. Recently, I am doing some research on improving the performance of Javascript engines. I found this Wiki quite helpful, especially the part about the IonMonkey engine. However, I found some pages are still missing (e.g., the optimization passes on MIR). I can offer some help to fill in the blank.