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13 votes
2 answers

When did the natural number of branch delay slots become greater than 1?

Some early RISC CPUs had branch delay slots, the theory being that this would make the CPU both cheaper and faster; you could omit some interlock circuitry, and at the same time, in some cases, ...
36 votes
8 answers

Why did DEC develop Alpha instead of continuing with MIPS?

I have been rereading a fascinating discussion about why DEC replaced VAX with Alpha based on talks with people who were there at the time; in a nutshell, in the opinion of the VAX engineers, it was ...
3 votes
0 answers

MIPS Encoding of blez/bgtz vs bltz/bgez

In the MIPS architecture, blez/bgtz and bltz/bgez are encoded differently: blez/bgtz are encoded as: [BLEZ/BGTZ: 6 bits] [RS: 5 bits] [0: 5 bits] [OFFSET: 16 bits] bltz/bgez are encoded as: [REGIMM: 6 ...