In MIPS, what are HI and LO

Question

I\'m reading about division in MIPS and I\'ve found that div

Divides $s by $t and stores the quotient in $LO and the remainder in $HI

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Answer 1

HI and LO are not numbered registers, IIRC. They are only used to store the results of operations that would not fit in a single register (e.g. multiplying two 32-bit integers could result in a 64 bit integer, so the overflow goes in HI).

edit: according to this class description, they are indeed special registers, so they are not numbered, and only accessible using special commands.