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立即数位显示不正确 #13

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@x402

目前已知B型、U型的位显示不正确:
b-type(x)

手册中是这样的:
b-type
B型指令给出的立即数有效位为[12:1],最低位补0,高位符号扩展。实际上RV中每种立即数类型都是指令只给出某一段(有效位),低位补0,高位符号扩展。

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