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- added real veriants of NextPower...

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git-svn-id: http://moon:8086/svn/vhdl/trunk@180 cc03376c-175c-47c8-b038-4cd826a8556b
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jens
2009-01-02 15:28:01 +00:00
parent 377b8c0993
commit e8ddaf8d98
1 changed files with 15 additions and 2 deletions
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lib/misc/utils_pkg.vhd
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@@ -1,5 +1,5 @@
----------------------------------------------------------------------- -----------------------------------------------------------------------
-- $Header: /tmp/cvsroot/VHDL/lib/misc/utils_pkg.vhd,v 1.1 2008-08-23 08:20:29 Jens Exp $ -- $Header: /tmp/cvsroot/VHDL/lib/misc/utils_pkg.vhd,v 1.2 2009-01-02 15:28:01 Jens Exp $
----------------------------------------------------------------------- -----------------------------------------------------------------------
library IEEE; library IEEE;
@@ -12,6 +12,8 @@ package utils_pkg is
-- Constants -- Constants
-- Functions -- Functions
function NextPowerOfTwo(x : real) return real;
function NextExpBaseTwo(x : real) return real;
function NextPowerOfTwo(x : natural) return natural; function NextPowerOfTwo(x : natural) return natural;
function NextExpBaseTwo(x : natural) return natural; function NextExpBaseTwo(x : natural) return natural;
function GCD(a, b : natural) return natural; function GCD(a, b : natural) return natural;
@@ -22,9 +24,20 @@ end utils_pkg;
package body utils_pkg is package body utils_pkg is
function NextExpBaseTwo(x : real) return real is
begin
return ceil(log2(x));
end NextExpBaseTwo;
function NextPowerOfTwo(x : real) return real is
begin
return 2.0**NextExpBaseTwo(x);
end NextPowerOfTwo;
function NextExpBaseTwo(x : natural) return natural is function NextExpBaseTwo(x : natural) return natural is
begin begin
return natural(ceil(log2(real(x)))); return natural(NextExpBaseTwo(real(x)));
end NextExpBaseTwo; end NextExpBaseTwo;
function NextPowerOfTwo(x : natural) return natural is function NextPowerOfTwo(x : natural) return natural is