IAR-EW 8051 Optimize Issue

/**
* LED Blinking Example
*
* Blinks LED on SmartRF04EB board with CC1110EM eval module.
*
* Author: David Eisner
*/

#include "hal_main.h"
#include "hal_mcu.h"


/**
 * Blink the LED nBlinks times
 */
static void appLedBlink(uint8 nBlinks)
{
    uint8 i;

    i = 0;
    while (TRUE) {
        if (i >= nBlinks)
            return;
        LED1 = LED_ON;
        halWait( 200 );  // ms
        LED1 = LED_OFF;
        halWait( 200 );  // ms
        i++;
    }
}


#define NCHARS (sizeof(digitChars)/sizeof(char));

int main( void )
{
    char digitChars[] = {'2', '3', '5', '7'};
    int di = 0;
    char c;
    uint8 nBlink;

    INIT_LED1();

    while (TRUE) {
        c = digitChars[di];

        if (c >= '0' && c <= '9')
            nBlink = c - '0';
        else
            nBlink = 5;

        appLedBlink(nBlink);
        di = (di + 1) % NCHARS;
        halMcuWaitMs(3000);   // wait a few seconds
    }
}