CCS/MSP430FR2355: Function defined in .C file does not added to code on main() function

Tool/software: Code Composer Studio

HI

I am trying to learn how to use functions (beginner in C code). i have written a simple LED toggle code that i am using, to verify that i am actually setting Mclk using the function.

When the function code is embedded directly into main program - leds toggle is fast on my MSP-EXP430FR2355..

When using a function - i have verified using disassembly that code is not embedded and leds toggle slowly.

Attached code:

in file setclk.h:

#ifndef SETCLK_H_
#define SETCLK_H_

extern void setclk (void); // Declaration for Function Set-Clk

#endif /* SETCLK_H_ */

in file setclk.c :

#include <msp430.h>
#include <setclk.h>

extern void setclk (void)           // Definition for Function Set-Clk
{
    //======== set CPU clock directly by registers for either 16Mhz or 8Mhz. ====================
        // Configure one FRAM wait-state as required by the device data-sheet for MCLK operation beyond 8MHz
        // must be done before configuring the clock system.
        FRCTL0 = FRCTLPW | NWAITS_2;            // for up to 8Mhz use FRCTLPW | NWAITS_0 , for Up to 16Mhz use NWAITS_1, for Up to 24Mhz use NWAITS_2

        __bis_SR_register(SCG0);                // disable FLL to enable writing the registers.
        CSCTL3 |= SELREF__REFOCLK;              // Set REFO as FLL reference source
        CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;         // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
        CSCTL0 = 0x0000;                         // Set lowest possible DCOx, MODx  ofer: MOD=0 DCO=0
        CSCTL1 = DCOFTRIMEN_1 | DCOFTRIM0 | DCOFTRIM1 | DCORSEL_5;// DCOFTRIM=5, DCO Range = 16MHz
        CSCTL2 = FLLD_0 + 487;                  // DCOCLKDIV = 16MHz ; For 8Mhz operation use: CSCTL2 = FLLD_1 + 244;   set FLLD=1 result in /2 divider and FLLN=244

        // Worst-case settling time for the DCO when the DCO range bits have been changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx
        // UG for optimization. 32 x 32 x 8 MHz / 32,768 Hz = 250000 = MCLK cycles for DCO to settle.
        __delay_cycles(250000);

        __bic_SR_register(SCG0);                  // enable FLL
    //======== End of set clock directly by registers =============
}

in file main.c :

#include <msp430.h>
#include <setclk.h>

void main(void) {
//==== Variables for Main ===============   // if variable outside of main - additional 500 bytes of Flash.
    unsigned int i=0;
//==== End of Variables for Main ========

    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode to activate previously configured port settings

    void setclk (void);                     // Executing Function Set-Clk

    P1DIR |= BIT0 | BIT1 | BIT2;            // Set P1.0 to output direction
    P6DIR |= BIT6;                          // Set P6.6 to output direction

    while (1)       // loop forever the below code
    {

    // toggle LED with delay
        if (i==0)       // check for delay value.
        {
            P1OUT ^= 0x01;                      // Toggle P1.0 using exclusive-OR
            P6OUT ^= BIT6;                      // Toggle P6.6 using exclusive-OR
            i=64000;            // start over
        }
        else
        {
            i=i-1;          // count delay
        }
    }
}
// ========= End of Main =================

CCS does not produce any errors, rather not including the code of the function.

1) What i have done wrong.

2) Why there are no errors?