Comments (6)
好像知道問題在哪裡了。
from 2017-computer-organization.
我沒有翻程式碼,不夠你ok就行了👌
from 2017-computer-organization.
感覺距離你上次push也太久了,應該你也忘記了。我現在用sum當less_out也能出來對的結果。他的bonus test case太少了。也看不出到底哪個寫法可能有錯。
from 2017-computer-organization.
@blessxu 你是在說Lab1吧! 這差不多兩年前的作業了 因為沒有寫文件所以我也忘記bonus_control
是什麼東西了QQ
Anyway 如果你有什麼疑問還是可以提出來,我會盡量幫你解答!
from 2017-computer-organization.
我來講一下吧,就是會有一個LST的set,需要解答 a是不是less than b。方法就是a-b,也就是a+b的2's complement,然後判斷正負。我看了看您這裡的code,最後less的值似乎用了cout來判斷,感覺bottom那邊的cout不能當做判斷的理由,sum才是正負的判斷bit。
https://github.com/ianre657/ComputerOrganization_2017Spring/blob/f6b445db44fa70f2ecdca4be1d492bf42d129bde/lab1/sourceCode/alu_bottom.v#L37
就是這裡。真的非常感謝了。
from 2017-computer-organization.
您這樣的寫法之所以答案是對的,是因為在compare裡面做了調整。
比如1000000000000000和1000000000000000比較SLT,如果根據cout來判斷的話,cout=1,less就是1。也就是less成立了,不過compare裡面居然還要求less的情況下不能equal(LT: out <= less & ~equal;),這其實是非常奇怪的要求,less成立怎麼還會equal呢。答案其實是會的,這段程式會在equal的情況下還判斷為less。不過有了這段矯正的code,所以最後的答案是對的。
from 2017-computer-organization.
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from 2017-computer-organization.