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April 11, 2009

今儿早上有点空,去铁手的西西河看东西,忽然看到萨苏写的这篇:“【原创】中国早期计算机研制中的小故事 我不看北京人在纽约“,里面提到我说的几句:

”当年我也干过类似的事情,要比较一段x86的汇编翻译+运行时间优化以后变成的另外一种机器的汇编。每天盯着模拟器反汇编出来16进制数字。

后来有天下班的时候坐在车里,从车窗望出去,看到旁边一辆车的牌号,脑子里就直接把那个号当成16进制数据了,先给扩展成二进制的,然后开始想:这是哪个指令呢?“

嗯,想起当年的事情,还是很好玩。

当时是公司在推一个新的指令集的芯片,因为兼容的问题,需要把市场上已有的应用,都用软件转化成新的机器的指令集,然后在新的架构上运行。这里面的技术和商业,以及法律问题很复杂,不是一两句话可以说清楚的,这里只说说好玩的东西。

当时是有一个翻译工具,把机器指令逐条的翻译成新机器的指令,这些东西都是二进制的,翻译本身就有bug,需要去查,另外翻译过后为了运行效率的问题,还要进行运行时间的优化。翻译还好办,就是一条指令对应几条目标机指令;优化就好玩了,是一堆目标机指令对应另外一大堆目标机指令,而且这个优化是运行时间的,就是说只能跑一段程序,然后再去内存里面看结果。所以才会有看见车牌当成16进制的事情。

不过这个项目后来还是没有推出,因为硬件推广不利。软件当时已经很成型了,好多应用都可以跑。我现在想想,其实如果龙芯一类的CPU有这个软件,好多应用就可以跑了。

3 Comments »

  1. 您剥壳比在嘻嘻河发言的时候可逗多呢。哈哈

    Comment by 嘻嘻呵 — April 14, 2009 @ 4:32 am

  2. 嘻嘻呵,

    我最近也很久没去河里逛了,太忙。

    Comment by 美人她爹 — April 27, 2009 @ 8:44 pm

  3. OHOHhgjg99t If the Pearls tend to be retailing right now from $350. 00 pounds, Post never notice would you determine these folks with regard to $2, 500.

    Comment by christian louboutin — December 29, 2012 @ 1:23 am

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