公众号记得加星标⭐️，第一时间看推送不会错过。 在RISC-V 峰会上，计算机体系结构传奇人物 David Patterson 发表了一场备受好评的主题演讲。他 利用扫描的原始幻灯片，带领观众回到 1981 年，讲述了精简指令集计算 (RISC) 在加州大学伯克利 分校的诞生。 帕特森以幽默的方式开场，提到他妻子酷爱穿越时空的电影，并解释说年龄增长使人能够轻松地穿越 回过去。他翻阅旧文件，重新发现了那些经典的塑料幻灯片——这些对许多年轻听众来说都很陌生 ——并用它们重现了四十多年前他在校园里做的演讲。 在此背景下，复杂指令集计算机（CISC）占据了主导地位。当时的主流理念认为，更丰富、更多样 化的指令能够弥合高级语言和硬件之间的"语义鸿沟"。摩尔定律推动了内存密度的不断提高，使得微 程序设计变得成本低廉。市场营销强化了这样一种观念：程序越复杂，可靠性就越高；而寄存器则被 视为过时的技术。 事实证明并非如此。高级语言编程仅使用了一小部分指令。诸如 VAX 的数组索引指令或 IBM 370 的多寄存器移动等复杂操作，通常比一系列简单的操作要慢。设计周期急剧延长，微代码错误层出不 穷；帕特森在 1979 年至 19 ...

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