Common interests and AMD belong to CISC processors.
But IBM's POWER GX processor is RISC.
So windows can't run on the original Mac.
Windows cannot run on the same godson.
The specific differences between these two processors are as follows:
Complex instruction set CPU is used to decode complex instructions, that is, instruction length, which is divided into several microinstructions to execute. This makes it easier to develop programs (because there are many instructions). However, due to complex instructions, poor execution efficiency and slow data processing, Pentium in PC is all CISC CPU.
RISC is a simplified instruction set CPU, with short instruction bits and a circuit for fast instruction processing, which makes instruction decoding and data processing faster, so the execution efficiency is higher than CISC. However, it must be processed by the compiler to give full play to its efficiency. As far as I know, IBM's Power PC is RISC CPU, and Cisco's CPU is also RISC CPU.
The CPU we often see in PC, such as Pentium-Pro(P6), Pentium-II, Cyrix, M 1 of Cyrix, and M2, K5 and K6 of AMD, are actually improved CISC, which can also be said to combine some advantages of CISC and RISC.
Comparison of main characteristics between RISC and CISC
Comparison content CISC RISC
The instruction system is complex, huge and simple.
The number of instructions is generally greater than 200 and generally less than 100.
The instruction format is generally greater than 4 and generally less than 4.
The addressing mode is generally greater than 4 and generally less than 4.
The instruction word length is not fixed equal length.
There are no restrictions on accessible instructions, only load/store instructions.
The frequency of use of various instructions varies greatly.
The execution time of various instructions varies greatly, and most of them are completed in one cycle.
It is difficult to optimize compilation and implementation easily.
The length of program source code is getting longer and longer.
Most controllers are microprogrammed, and most controllers are hardwired.
The development time of software system is getting shorter and shorter.
Therefore, the architectures of the two processors are different and cannot be directly compared.
But now the processing level of Loongson can be compared with the original P4.
Because windows can't run on it and its speed is not as fast as mainstream processors, there is no Loongson for individual users on the market.
However, we still hope and believe that Godson will win the dominance of the processor one day! !