Nios/extend

Write a function (named extend) that will extend a number to 32 bits and return the extended number (in r2). The first function parameter (in r4) specifies which operation to do, while the second parameter holds the number to extend:

r4 = 0: Zero extend 8 bit to 32 bit
r4 = 1: Zero extend 16 bit to 32 bit
r4 = 2: Sign extend 8 bit to 32 bit
r4 = 3: Sign extend 16 bit to 32 bit

int extend(int operation, int n);

Sample Input

extend(2,0xf0)

Sample Output

r2=0xfffffff0

# A test case to test your function with
.global _start
_start:
    movi r4, 2       # 2 = sign extend 8->32
    movi r5, 0xf0    # The number to extend
    call extend
    br _start        # End of testing code

# A function to extend. Only this part will be tested.
extend:

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