Assembly code

7. [5 pts] Sign extend an 8-bit signed integer to a 32-bit signed integer. Your assembly code must use an SXTB instruction, and thus it should be much more efficient than the following C code

. int32_t signExt8to32(int32_t n)

{ if (n & 0x00000080)

{ return 0xFFFFFF00 | n;

} else

{ return n; }

}