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/*
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* definitions for dc's "register" declarations
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*
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* Copyright (C) 1994, 2000, 2008
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* Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifdef HAVE_LIMITS_H
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# include <limits.h> /* UCHAR_MAX */
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#endif
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#ifndef UCHAR_MAX
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# define UCHAR_MAX ((unsigned char)~0)
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#endif
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/* determine how many register stacks there are */
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#ifndef DC_REGCOUNT
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# define DC_REGCOUNT (UCHAR_MAX+1)
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#endif
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/* efficiency hack for masking arbritrary integers to 0..(DC_REGCOUNT-1) */
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#if (DC_REGCOUNT & (DC_REGCOUNT-1)) == 0 /* DC_REGCOUNT is power of 2 */
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# define regmap(r) ((r) & (DC_REGCOUNT-1))
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#else
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# define regmap(r) ((r) % DC_REGCOUNT)
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#endif
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