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EVM SIGNEXTEND Opcode explanation

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区块链技术 发表于 2018-11-26 22:42:02 | 显示全部楼层 |阅读模式 打印 上一主题 下一主题
 

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I am trying to develop my own small EVM. That is a good way for me to learn more about the bytelevel. I hadn't had any problems with most of the instructions, but there are a few, which I just don't understand. SIGNEXTEND is one of it...

This is how the yellow paper describes the opcode:

I am trying to understand and figure out what is happening here and how this opcode works. I can't find a suitable example, nor a case where I might need this opcode.

Does anyone of you have any examples or an explanation for this opcode?

Thanks in advance.




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