repeated initialisation of static variable doesn't overwrite previous value?

hey guys, i saw this piece of code.

// main.m
#import <Foundation/Foundation.h>

int countByTwo() {
    static int currentCount = 0;
    currentCount += 2;
    return currentCount;
}

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSLog(@"%d", countByTwo());    // 2
        NSLog(@"%d", countByTwo());    // 4
        NSLog(@"%d", countByTwo());    // 6
    }
    return 0;
}

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when the countByTwo function is called repeatedly, it always hits the line

   static int currentCount = 0;

however from the main method 's comments, it seems that the currentCount variable isn't set to 0 again even though it hits the initialisation line multiple time.

Question: if we have a line "static int currentCount = 0;", when it is run multiple times LVVM will check if currentCount already has a value other than 0 and if it does it will skip the setting of the value to 0 is that correct?

thanks in advance guys!