Saturday, September 5, 2009

Reduced instruction set computer - Wikipedia, the free encyclopedia

Reduced instruction set computer - Wikipedia, the free encyclopedia: "Non-RISC design philosophy
For more details on this topic, see CPU design.

In the early days of the computer industry, programming was done in assembly language or machine code, which encouraged powerful and easy to use instructions. CPU designers therefore tried to make instructions that would do as much work as possible. With the advent of higher level languages, computer architects also started to create dedicated instructions to directly implement certain central mechanisms of such languages. Another general goal was to provide every possible addressing mode for every instruction, known as orthogonality, to ease compiler implementation. Arithmetic operations could therefore often have results as well as operands directly in memory (in addition to register or immediate)."

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