Arm/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:
    mov r0, #0xf0    // First parameter is always in r0
    bl signext
    b _start         // End of testing code

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

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Arm/signext

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