RISC CISC

1
?????????????????????? RISC ??? CISC

• ?????????? ??????????
• ??????????????????????????
• ??????????????????????

2
CISC

• Complex Instruction Set Computer
• ???????????????????????????
• ???????????????????????????????
• ??????????????????????
• ????? compiler ???????????
• ???????????????????????? optimize ???????
  compiler
• ????????????????????????????? execution
• ??????????????? ?-op
• ??? addressing mode ???????
• ??????????????????????????????
• ??????????????????????????
• ???? ???????????? CASE (switch) ????????? VAX
• ?????????????????????????????????????????????????

3
RISC

• Reduced Instruction Set Computer
• Key features
• ?? General-Purpose Register ????????
• ??????????????? compiler ????? optimize
  ????????????????
• ?????????????????????????????????
• One instruction per cycle
• ??? hardwired
• ????????? pipelining
• ??????? register addressing
• Register to register operations
• Few, fixed, simple instruction formats

4
?????????? Register File ????????

• ?????
• ??????????????????????????????????????????????????
  ?
• Software solution
• (????????????????)
• ???????????????????? compiler
• Hardware solution
• (???????????????)
• ??????????????? register ???????????????????
• Pop quiz
• ??????????????????????????????????????????????????
  ???????????????????????

5
?????????????????? Registers ??? Cache

• Register
• ???????????????????????????????????
• ?????????????? compiler
• ?????????????????????????????????????
• ??? Register addressing

• Cache
• ??????????????????????????????????
• ?????????????? (????????????)
• ?????????????????????????????? caching algorithm
• ??? Memory addressing

6
RISC v CISC

• Quantitative
• ?????????????????????????
• Qualitative
• ????????????????????????????
• ???????? compiler
• ??????????????? die
• Problems
• ??????????????????????????????????
• ?????????????? cpu ????????
• ?????????????????????????????????? compiler ????
• ????????? ???????????
• ?????????????????
• ????????????????