五千年(敝帚自珍)

主题:【原创】论山寨手机与Android联姻的技术基础 -- 邓侃

共:💬324 🌺1366
全看分页树展 · 主题 跟帖
家园 好文。带点商榷。

好文。现在联发科的确是一支不可忽视的力量了,以前不太关注,以后要多关心了。尤其是MTK拜了高通的码头以后,对于不少中国的企业来说,也许算一个坏消息吧。

PS,

于是他们发明了复杂指令集CISC(Complex Instruction Set Computer),并且设计了相应的CPU物理结构

CISC早于RISC,RISC的初衷很大程度上就是为了取代CISC,当然之后的发展就复杂了。建议修改一下原文。

In the late 1950s, faced with the need to rationalize it's computer product lines, IBM instituted a research program having the objective of creating a range of software compatible computers that would also capture its existing software investments. The result, introduced on April 7, 1964 was the System/360, the first commercially available microprogrammed computer architecture (latter to become known as complex instruction set computer, or CISC architecture). The success of System/360 resulted in CISC architectures dominating computer, and later microprocessor, design for two decades.

However, the ability to incorporate any instruction which could be microprogrammed turned out to be a mixed blessing. During the mid-1970s, improved performance measurement tools demonstrated that the execution of most application programs on CISC-based systems was dominated by a few simple instructions, and the complex ones were seldom used. As a result, in October 1975 the project was initiated at IBM's Watson Research Center which, four years later gave birth to a 32-bit RISC microprocessor named for the building in which it was developed. In the immortal words of Joel Birnbaum, the first leader of the 801 project and later designer of the PA-RISC architecture: "Engineers had guessed that computers needed numerous complex instructions in order to work efficiently. It was a bad guess. That kind of design produced machines that were not only ornate, but baroque - even rococo."

全看分页树展 · 主题 跟帖


有趣有益,互惠互利;开阔视野,博采众长。
虚拟的网络,真实的人。天南地北客,相逢皆朋友

Copyright © cchere 西西河