False Dependency

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

var sum: i32 = 0;
for (arr) |x| {
    sum +%= @intCast(@popCount(@as(u32, @bitCast(x))));
}

int r0 = 0, r1 = 0, r2 = 0, r3 = 0;
for (auto i = 0u; i < arr.size(); i += 4) {
  r0 += __builtin_popcount(arr[i]);
  r1 += __builtin_popcount(arr[i + 1]);
  r2 += __builtin_popcount(arr[i + 2]);
  r3 += __builtin_popcount(arr[i + 3]);
}
sum = r0 + r1 + r2 + r3;

var r0: i32 = 0;
var r1: i32 = 0;
var r2: i32 = 0;
var r3: i32 = 0;
var i: usize = 0;
while (i < arr.len) : (i += 4) {
    r0 +%= @intCast(@popCount(@as(u32, @bitCast(arr[i]))));
    r1 +%= @intCast(@popCount(@as(u32, @bitCast(arr[i+1]))));
    r2 +%= @intCast(@popCount(@as(u32, @bitCast(arr[i+2]))));
    r3 +%= @intCast(@popCount(@as(u32, @bitCast(arr[i+3]))));
}
sum = r0 +% r1 +% r2 +% r3;