Implement the following C code in MIPS assembly. Hint: Remember that the stack pointer must remain aligned on a multiple of 16. int fib(int n){ if (n == 0) return 0; else if (n == 1) return 1; else return fib(n ? 1) + fib(n ? 2); } Implementation

Implementation

The following MIPS assembly implements the C code #. This function calculates number n of Fibonacci.# int fib[int]
#
# int fib(int n) {
#   if (n == 0) return 0;
#   else if (n == 1) return 1;
#   else return fib(n – 1) + fib(n – 2);
# }

.text
.globl fib

fib:
# Retain the stack’s return address, and add n
addi $sp, $sp, -8
sw $ra 4($sp).
Sw $a0.

# Determine if n equals 0 or 1.
beq $a0, $zero, and fib_return_0
addi $t0, $zero, 1
beq $a0, $t0, fib_return_1

# Calculate Fib(n-1) and fib(2)
addi $a0, $a0, -1
jal fib
lw $a0; 0($sp);
addi $a0, $a0, -2
jal fib
lw $t1, 0,($sp).

# Return fib (n – 1) + return fib (n – 2)
Add $v0 to $v0 or $t1

# Return the stack to its original state
fib_return:
addi $sp, $sp, 8
lw $ra 4, 4($sp).
jr $ra
fib_return_0:
Li $v0, 0,
j fib_return
fib_return_1:
1. li $v0
j fib_return

Cont…

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