loopgen.cpp

#include <vector>
#include <numeric>
using namespace std;

// Compare lowering of loops for -Og, -O2 and -O3
// https://godbolt.org/z/mNtLqi

int f1(const vector<int> &v) {
    int sum = 0;
    for (int val : v) {
        sum += val;
    }
    return sum;
}

int f2(const vector<int> &v) {
    int sum = 0;
    for (auto p = begin(v); p != end(v); p++) {
        sum += *p;
    }
    return sum;
}

int f3(const vector<int> &v) {
    int sum = 0;
    for (size_t i = 0; i < v.size(); i++) {
        sum += v[i];
    }
    return sum;
}

int f4(const vector<int> &v) {
    return accumulate(begin(v), end(v), 0);
}