complex instruction set computer
| Noun | 1.complex instruction set computer - (computer science) a kind of computer architecture that has a large number of instructions hard coded into the CPU chip |
| 单词 | complex instruction set computer | ||
| 释义 | complex instruction set computer
Complex Instruction Set Computercomplex instruction set computer[¦käm‚pleks in′strək·shən ‚set kəm‚pyüd·ər]Complex Instruction Set ComputerBefore the first RISC processors were designed, many computerarchitects were trying to bridge the "semantic gap" - todesign instruction sets to support high-level languages byproviding "high-level" instructions such as procedure call andreturn, loop instructions such as "decrement and branch ifnon-zero" and complex addressing modes to allow datastructure and array accesses to be compiled into singleinstructions. While these architectures achieved their aim of allowinghigh-level language constructs to be expressed in fewerinstructions, it was observed that they did not always resultin improved performance. For example, on one processor it wasdiscovered that it was possible to improve the performance byNOT using the procedure call instruction but using a sequenceof simpler instructions instead. Furthermore, the morecomplex the instruction set, the greater the overhead ofdecoding an instruction, both in execution time and siliconarea. This is particularly true for processors which usedmicrocode to decode the (macro) instruction. It is easierto debug a complex instruction set implemented in microcodethan one whose decoding is "hard-wired" in silicon. Examples of CISC processors are the Motorola 680x0 familyand the Intel 80186 through Intel 486 and Pentium. See CRTC Interconnection Steering Committee complex instruction set computer
Synonyms for complex instruction set computer
|
||
| 随便看 |
|
英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。