Using masks in mips

i'm working on building multiplication algorithums in mips assembly
looks like the best way to build it would be to make a mask and shift that looking for the ones in the multiplican then summing from there, booth. I have basicly hit a wall in that well, i am confused on how to work with my loops, increament what, add this that. so on. Anyone who is fairly knowledgable, i would appricate some help, thanks

dont fuck with the jesus