def visit_BitVecShiftLeft(self, expression, *operands):
        """ a << 0 => a                       remove zero
            a << ct => 0 if ct > sizeof(a)    remove big constant shift
        """
        left = expression.operands[0]
        right = expression.operands[1]
        if isinstance(right, BitVecConstant):
            if right.value == 0:
                return left
            elif right.value >= right.size:
                return left
def visit_BitVecShiftLeft(self, expression, *operands):
        
        left = expression.operands[0]
        right = expression.operands[1]
        if isinstance(right, BitVecConstant):
            if right.value == 0:
                return left
            elif right.value >= right.size:
                return left
def visit_BitVecShiftLeft ( self , expression , * operands ) : left = expression . operands [ 0 ] right = expression . operands [ 1 ] if isinstance ( right , BitVecConstant ) : if right . value == 0 : return left elif right . value >= right . size : return left
a << 0 => a                       remove zero
            a << ct => 0 if ct > sizeof(a)    remove big constant shift
a << 0 = > a remove zero a << ct = > 0 if ct > sizeof ( a ) remove big constant shift