Which method is better for incrementing and traversing in a loop in C

Question

These are example of incrementing each element of an array by 10.

for (i = 0; i< 100; i++){
    arr[i] += 10;
}

or

for (i = 0; i< 100; i+=2){
    arr[i] += 10;
    arr[i+1] += 10;
}

which is the efficient way to solve this problem out of these these two in C language?

Answer 1

As @JeremyRoman stated compiler will be better than the humans optimizing the code.

But you may make its work easier or tougher. In your example the second way prevents gcc from unrolling the loops.

So make it simple, do not try to premature micro optimize your code as result might be right opposite than expected

https://godbolt.org/z/jYcLpT