Having disassembled many different N64 microcodes, I find it sort of interesting. All the microcodes have to deal with the issue of IMEM and DMEM being very limited in size, so there are a few different techniques to stream data in and out. However with respect to MAME, I think more of the issues with MAME's N64 emulation of the RSP are related to timing issues and synchronization with the rest of the N64 components..
Also you can optimize the RSP code all you want, but the RDP and memory bandwidth are still going to be major factors in the overall performance that you can't do much to optimize.
Last edited by Happy; 03/18/20 09:10 PM.