### A good answer might be:

The `neg.s fd,fs` instruction toggles the sign bit of the float in `$fs` when it copies the pattern to `$fd`.

# Example Program

Here is a program that serves no practical purpose except as an example. The program loads a general purpose register with a two's complement 1 and copies that pattern to a floating point register. Then it loads a floating point register with an IEEE 1.0 and moves that pattern to a general purpose register.

    ## Move data between the coprocessor and the CPU

            .text
            .globl main

    main:
            li      $t0,1           # $t0 <-- 1
                                    # (move to the coprocessor)
            mtc1    $t0,$f0         # $f0 <-- $t0

            li.s    $f1,1.0         # $f1 <-- 1.0
                                    # (move from the coprocessor)
            mfc1    $t1,$f1         # $t1 <-- $f1

            li      $v0,10          # exit
            syscall

    ## end of file

Here is what the SPIM registers contain after running the program:

### QUESTION 15:

Could floating point arithmetic be done with the value in register $f0?