Example

The example program looks at two floating point values, A and B, and writes a message saying which one is smallest. First the program loads the two values A and B into registers:

main:   # get the values into registers
        l.s     $f0,A
        l.s     $f2,B
        . . . . 
    
A:      .float  4.830
B:      .float  1.012
        . . . .

Then the program tests if A<B, or if B<A. If neither of these is true, then it must be that B==A.

        . . . .
        c.lt.s  $f0,$f2          # is A < B?
        bc1t    printA           # yes:  print A

        c.lt.s  $f2,$f0          # is B < A?
        bc1t    printB           # yes:  print B

        la      $a0,EQmsg        # otherwise
        li      $v0,4            # they are equal
        . . . .

(Remember that for this chapter, branch delays have been turned off in SPIM.)

QUESTION 5:

The three outcomes can be detected by other comparison instructions. Here is another arrangement of the code:

        c..s  $f0,$f2       # is A == B?
        bc1t    printEQ             # yes: print equal

        c..s  $f2,$f0       # is B < A?
        bc1t    printB              # yes: print B

                                    # otherwise A < B

Fill in the blanks. You may wish to consult the list of floating point comparison instructions.

Answer:

Example

QUESTION 5: