Question

5) Provide the missing fragment of the TOY AL subprogram below to sum the unsigned entries of an array A that are less than 30 consistent with the following subprogram interfacc Label: Sum30 On entry: Register $1 is the return address of the caller. Register $A contains the address of the array A Register $B contains n the number of elements in A On exit: Register $F contains the sum of the elements in A that are les than 30. Main memory will not have changed, but the registers may have Sum30 lis lis lis lis $8, $9, $C, SF, $9-1 $C = 30 $F = 30 Loop so, $8, $B2 n UGE, Done $7, $4, $8 $6, $7,0 : t= $6=A[j] sub bc add 1 < your code goes here> add $8, $8, $9 bc ALL, Loop Done : return ALL, $1, $0 bcl

Answer 1

Note : The missing fragment is written in block letters. In the fragment, $6 which is the particular indexed element values of the array ; is checked with 30 ; if it is less than 30 then added, otherwise the addition is skipped

sub $0, $6, $C
bc UGE, NEXT
add $F, $F, $6
NEXT