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[/] [System09/] [rev_86/] [rtl/] [VHDL/] [bit_funcs.vhd] - Blame information for rev 158

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Line No. Rev Author Line
1 65 davidgb
library IEEE;
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   use IEEE.std_logic_1164.all;
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   use IEEE.std_logic_arith.all;
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   use IEEE.std_logic_unsigned.all;
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package bit_funcs is
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   function log2(v: in natural) return natural;
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   function pow2(v: in natural) return natural;
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end package bit_funcs;
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package body bit_funcs is
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   function log2(v: in natural) return natural is
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      variable i: natural;
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      variable n: natural;
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      variable logn: natural;
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   begin
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      n := 1;
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      for i in 0 to 128 loop
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         logn := i;
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         exit when (n>=v);
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         n := n * 2;
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      end loop;
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      return logn;
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   end function log2;
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   function pow2(v: in natural) return natural is
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      variable i: natural;
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      variable pown: natural;
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   begin
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      pown := 1;
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      for i in 0 to v loop
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         exit when (i=v);
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         pown := pown * 2;
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      end loop;
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      return pown;
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   end function pow2;
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end package body bit_funcs;

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