It always returns 1 for me, unless you intend for your function to be called in list context. And since local $_ is buggy, you'd be best off avoid it. 

sub next_power_of_two {
    my %s;
    @s{1..shift} = ();
    return %s =~ m{/(.*)} && $1;
}

[download]

Update: Added local $_ fix.

In reply to Re: next power of two by ikegami
in thread next power of two by dk

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