C++ vs Java? Why does the ICC generate slower code than VC? [closed]

Answer 1

i see you are running the following loop

for(int i = 0; i < 1024 * 1024; i++){
        for(int x = 0; x < 1024; x++){
            var += arr[x];
        }
    }

twice in the Java code; while once in the c++ code; this might bring a caches warmup which makes the Java code finally execute faster than the C++.