### A good answer might be:

What does the following assembly language instruction do?

    addu $t5,zero,$t7

It copies the contents of register $t7 into register $t5.

# Pseudoinstructions

The `addu` instruction, used as above, copies a bit pattern from the source register into the destination register. This is usually called a move operation, although the source register does not change. It is often convenient to move a value from one register to another.

It is awkward to say "add" when you mean "move". The extended assembler allows you to use the mnemonic `move` instead of `addu`. This mnemonic does not correspond to a new machine instruction. It is just a way of asking for the same instruction by using a more intuitive mnemonic. It is a pseudoinstruction that the assembler translates into the appropriate basic assembly instruction.

> A pseudoinstruction is an instruction that the extended assembler replaces with one or more basic assembly instructions.

The extended assembler has many pseudoinstructions. Sometimes they are just convenient re-naming of basic assembly instructions. Other times they correspond to a small, convenient sequence of basic assembly instructions. Here is the `move` pseudoinstruction:

    move d,s        #  copy the contents of
                    #  the source register s
                    #  to the destination register d
                    #  (pseudoinstruction)

The registers `d` and `s` can be specified by using register mnemonic names (such as `$t5` or `zero`) or by using register numbers (such as `$13` or `$0`). This is true for all instructions of the extended assembler.

### QUESTION 6:

Write the instruction that moves (copies) the contents of register `$t3` into register `$s1`.

    _____   ____ , ____