Memory Bank Conflict

for (auto i = 0u; i < arr.size(); ++i) {
  sum += arr[i];
}

for (arr) |x| {
    sum +%= x;
}

^ This is Faster?

constexpr int ROW_SIZE = 8192 / sizeof(int);
int idx = 0;
for (auto i = 0u; i < arr.size(); ++i) {
  sum += arr[idx];
  idx = (idx + ROW_SIZE) % arr.size();
}

const ROW_SIZE = 8192 / @sizeOf(i32);
var idx: usize = 0;
for (0..arr.len) |_| {
    sum +%= arr[idx];
    idx = (idx + ROW_SIZE) % arr.len;
}

^ This is Faster?

* The benchmark is run under AMD Ryzen 9.

* For the full benchmark code, please refer here.

* For illustration purposes only, see FAQ for more details.