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Date: Mon, 1 Oct 2012 01:52:43 -0700 (PDT)
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Subject: Re: highest bit, statically determined
From: Anatoly Chernyshev <achernyshev@gmail.com>
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Date: 2012-10-01T01:52:43-07:00
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> 
>     68580000 1.687923000
> 
>     68580000 1.447859000
> 
>     68580000 24.481472000

Yes, that could be expected. Here's the draft lightning-fast version:

procedure xx is
last_bit_a: array(0..255) of natural:=(0|1=>0,2|3=>1,4..7=>2, 8..15=>3, 16..31=>4,32..63=>5, 64..127=>6, 128..255=>7);
N:natural;
begin
...
Highest_Bit_In_Octet:=last_bit_a(N);
...
end xx;