Comments (2)
Maxwellwenjie
commented on September 4, 2024
4
请教一个问题，希望有缘人回答~ 书本上练习题4.35给了个例子，关于改变Execute阶段的转发源为E_dstE。答案给的例子有一点不太明白，为什么在修改过后的版本中，条件传送源值0x123被转发到ALU的输入valA，valB正确地得到了操作数值0x321了？ 我根据答案的例子绘出流水线图，对应
addq %rdx, %rdx的decode阶段对应的irmovq $0x312, %rdx的write-back阶段，%rdx的值还没有写回寄存器文件，为什么答案说valB正确地得到了操作数值0x321了？
题目中说in the HCL code for d_valA uses signal e_dstE to see whether
to select the ALU output e_valE as the forwarding source. Suppose instead that
we use signal E_dstE, the destination register ID in pipeline register E for this
selection. 所以题目的意思应该是d_valA改了HCL版本，选择转发，d_valB没有改版本选择不转发，所以d_valB的值是从寄存器文件里来的。这个解释可以吗？
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paradox181
commented on September 4, 2024
我已收到您的邮件
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