Compiler/MSP430G2211: Errors including assembler source files (.s43) in project

Tool/software: TI C/C++ Compiler

I am trying to implement efficient multiplication and division for a PID controller on the msp430g2211. I am referencing the application note: www.ti.com/.../slaa329.pdf

I am using ccs 7.1.0.

when I add a file to my project, like horner_mul_int.s43 from the above application note, I get the error 'Illegal mnemonic specified' on each line. What is the correct process for including assembler source files and accessing the external functions in main.c?

horner_mul_int.s43

#include "msp430g2211.h"

	NAME	horner_mul_int
            public mul_horner_int
	
            RSEG CODE
        
mul_horner_int

            mov.w     R12,R13               ; The operand "input" in register R12 
            rla.w     R13             
            add.w     R12,R13               ; X1=X*2^1+X
            rla.w     R13
            rla.w     R13
            add.w     R12,R13               ; X2=X1*2^2+X
            rla.w     R13
            add.w     R12,R13               ; X3=X2*2^1+X
            rla.w     R13
            add.w     R12,R13               ; X4=X4*2^1+X
            rla.w     R13
            rla.w     R13
            rla.w     R13
            add.w     R12,R13               ; Final Result=X5=X4*2^3+X 
            mov.w     R13,R12               ; The final answer returned to the 
                                            ; calling function
            ret
            END