Write a subprogram that accepts 4 values from the argument registers $a0 through $a3 and returns to the caller programme the largest value and the average of $v0 and $v1. The programme must be set up in the following manner: Subprogram largestAndAverage($a1, $a2, $a3, $a4) { int var0 = $a0, var1 = $a1, var2 = $a2, var3 = $a3; $s0 = getLarger($a1, $a2); $s0 = getLarger($s0, $a3); $v0 = getLarager(s0, $a4); // Largest is in $v0 $v1 = (var0 + var1 + var2 + var3)/ 4; // Aversge is in $v1 return; } Subprogram getLarger($a0, $a1) { $v0 = $a0 if ($a1 > $a0) $v0 = $a1 return; } Take note of how var0...var3 are used. The values of $a0 and $a1 (at least) must be placed on the stack since they are not immediately available when needed to compute the average because they are modified during the call to getLarger. You must use the getLarger subprogram displayed above to compute the greatest value for this issue, and it must be called before the average calculation. This indicates that $a0 and $a1 must be kept on the stack at the very least, however I would advise all four be stack variables as shown here. It is possible to create a solution which does not require the use of the stack variables, for example by simply calculating the average first. Such solutions do not answer the issue of how to handle variables that change using the stack, and are thus incorrect.
1) Write a subprogram that accepts 4 values from the argument registers $a0 through $a3 and returns to the caller programme the largest value and the average of $v0 and $v1. The programme must be set up in the following manner:
Subprogram largestAndAverage($a1, $a2, $a3, $a4)
{
int var0 = $a0, var1 = $a1, var2 = $a2, var3 = $a3;
$s0 = getLarger($a1, $a2);
$s0 = getLarger($s0, $a3);
$v0 = getLarager(s0, $a4); // Largest is in $v0
$v1 = (var0 + var1 + var2 + var3)/ 4; // Aversge is in $v1
return;
}
Subprogram getLarger($a0, $a1) {
$v0 = $a0
if ($a1 > $a0)
$v0 = $a1
return;
}
Take note of how var0...var3 are used. The values of $a0 and $a1 (at least) must be placed on the stack since they are not immediately available when needed to compute the average because they are modified during the call to getLarger. You must use the getLarger subprogram displayed above to compute the greatest value for this issue, and it must be called before the average calculation. This indicates that $a0 and $a1 must be kept on the stack at the very least, however I would advise all four be stack variables as shown here.
It is possible to create a solution which does not require the use of the stack variables, for
example by simply calculating the average first. Such solutions do not answer the issue of
how to handle variables that change using the stack, and are thus incorrect.
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