re wp pcf linux risc leebr ecf toronto edu lee brian writes in article qu ud hd sunb ocs mq edu au eugene mpce mq edu au writes in article c o yq m csie nctu edu tw ghhwang csie nctu edu tw ghhwang writes dear friend the risc means reduced instruction set computer the risc usually has small instruction set so as to reduce the circuit complex and can increase the clock rate to have a high performance you can read some books about computer architecture for more information about risc hmm not that i am an authority on risc but i clearly remember reading that the instruction set on risc cpus is rather large the difference is in addressing modes risc instruction sets are not as orthogonal is cisc the original riscs had small instruction sets and simple ones the idea was that a every instruction should be completable in a single clock cycle and b to have no microcode and c extensive pipelines a few comparisons from patterson reduced instruction set computers cacm v cpu year instructions microcode ibm kb dec vax kb ibm ucb risc stanford mips while researching for the vlsi vax dec discovered that of the vax microcode is there to support of the instruction set which accounted for a mere of all instructions executed the uvax subsetted the architecture onto a single chip and used a software emulator for these very complex instructions the full vlsi uvax included the entire instruction set was times more copmlex but only ranm faster cpu chips microcode transistors uvax k k vlsi uvax k k real deryk barker computer science dept camosun college victoria b c email dbarker camosun bc ca phone
