Nios/signext

Write a function (named signext) that will sign-extend an 8-bit input number (the lowest 8 bits of the function parameter) to 32 bits. The upper 24 bits of the input number should be ignored (and may not necessarily be zero).

int signext(char n);

Sample Input

0xf0

Sample Output

0xfffffff0

# A test case to test your function with
.global _start
_start:
    movi r4, 0xf0    # First parameter is always in r4
    call signext
    br _start        # End of testing code

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

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