manticore/platforms/evm.py
def SIGNEXTEND(self, size, value):
        """Extend length of two's complement signed integer"""
        # FIXME maybe use Operators.SEXTEND
        testbit = Operators.ITEBV(256, size <= 31, size * 8 + 7, 257)
        result1 = (value | (TT256 - (1 << testbit)))
        result2 = (value & ((1 << testbit) - 1))
        result = Operators.ITEBV(256, (value & (1 << testbit)) != 0, result1, result2)
        return Operators.ITEBV(256, size <= 31, result, value)
def SIGNEXTEND(self, size, value):
        """Extend length of two's complement signed integer"""
        # FIXME maybe use Operators.SEXTEND
        testbit = Operators.ITEBV(256, size <= 31, size * 8 + 7, 257)
        result1 = (value | (TT256 - (1 << testbit)))
        result2 = (value & ((1 << testbit) - 1))
        result = Operators.ITEBV(256, (value & (1 << testbit)) != 0, result1, result2)
        return Operators.ITEBV(256, size <= 31, result, value)
Extend length of two's complement signed integer