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3b384ce2a2
the other. It really matters for non-power-of-2 numbers. This breaks k8 builds; fix is coming. Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> git-svn-id: svn://coreboot.org/repository/coreboot-v3@852 f3766cd6-281f-0410-b1cd-43a5c92072e9
84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* It is based on the file js/src/jscpucfg.c from Mozilla, CVS rev. 3.25.
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* See http://lxr.mozilla.org/mozilla1.8.0/source/js/src/jscpucfg.c.
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*/
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* return the truncated log2 of the number.
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* @param n number to take the log of
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* @return log2 of the smallest integer that is a power of of 2
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* and that is <= to the parameter. E.g. log2f(72) is 6.
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*/
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int log2f(unsigned int n)
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{
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int log2 = 0;
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if (n >> 16)
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log2 += 16, n >>= 16;
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if (n >> 8)
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log2 += 8, n >>= 8;
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if (n >> 4)
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log2 += 4, n >>= 4;
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if (n >> 2)
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log2 += 2, n >>= 2;
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if (n >> 1)
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log2++;
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return log2;
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}
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/**
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* return the log2 of the number in integer form, rounded up as needed.
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* @param n number to take the log of
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* @return log2 of the smallest integer that is a power of 2
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* that is >= to the parameter. E.g. log2(72) is 7.
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*/
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int log2c(unsigned int n)
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{
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int log2 = 0;
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if (n & (n - 1))
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log2++;
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return log2 + log2f(n);
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}
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