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From: "Martin Dowie" <martin.dowie@baesystems.com>
Newsgroups: comp.lang.ada
Subject: Re: Bit manipulation
Date: Mon, 7 Feb 2005 15:32:34 -0000
Organization: BAE SYSTEMS
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Date: 2005-02-07T15:32:34+00:00
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Maurizio wrote:
> hi, i need two hint:
>
> i need to acces to a 32 bit word (Interfaces.Unsigned_32).
> how i can do to take the three m.s.bit? (30,31,32)

As you would in 'C' - mask them, e.g.

   use type Interfaces.Unsigned_32;

   function Get_3_msb (I : Interfaces.Unsigned_32)
      return Interfaces.Unsigned_32 is
   begin
      return I and 16#E000_0000#;  -- top 3 bits only
   end Get_3_msb;

Cheers

-- Martin