Implementation of sprod

sprod : lw $4,X(0) #x1 into $4

lw $5,X(4) #y1 into $5

addi $29,$29,-4 #ready for push

sw $31,0($29) #push $31

#return address now saved,

#to be popped at end sprod

jal prod #call prod, result in $6

add $20,$0,$6 #copy result into $20

lw $4,X(8) #x2 into $4

lw $5,X(12) #y2 into $5

jal prod #call prod, result in $6

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