countScalar

pub fn countScalar(comptime T: type, list: []const T, element: T) usize {
    const n = list.len;
    var i: usize = 0;
    var found: usize = 0;

    if (use_vectors_for_comparison and
        (@typeInfo(T) == .int or @typeInfo(T) == .float) and std.math.isPowerOfTwo(@bitSizeOf(T)))
    {
        if (std.simd.suggestVectorLength(T)) |block_size| {
            const Block = @Vector(block_size, T);

            const letter_mask: Block = @splat(element);
            while (n - i >= block_size) : (i += block_size) {
                const haystack_block: Block = list[i..][0..block_size].*;
                found += std.simd.countTrues(letter_mask == haystack_block);
            }
        }
    }

    for (list[i..n]) |item| {
        found += @intFromBool(item == element);
    }

    return found;
}