Anyone know how to do this? Here\'s how it works: What is the C equivalent of th

Question

Anyone know how to do this? Here's how it works:

What is the C equivalent of the following MIPS subroutine? Assume that the functions's parameters are integers named a, b, c, etc. in the C version of the function. You need to determine how many parameters this subroutine has.

funfunc: addi    $sp, $sp, -8

                sw      $s0, 4($sp)

                sw      $s1, 0($sp)

               move  $so, $0

               addi    $s1, $0, 1

               move  $v0, $0

loop:      bge     $s0, $a0, End

               add     $v0, $v0, $s1

               sll        $s1, $s1, 1

               addi    $s0, $s0, 1

               j           loop

End:      lw         $s1, 0($sp)

               lw        $s0, 4($sp)

               addi    $sp, $sp, 8

               jr          $ra

Explanation / Answer

C function:

int sum(int n) /* $a0 */

{

int i = 0; /* $s0 */

int val = 1; /* $s1 */

int sum = 0; /* $v0 */

while (i < n)

{

sum += val;

val *= 2;

i++;

}

return sum;

}

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