41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
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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 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 2, 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, you can either send email to this
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* program's author (see below) or write to: The Free Software Foundation,
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* Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
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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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/* determine how many register stacks there are */
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#ifndef DC_REGCOUNT
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# ifndef UCHAR_MAX
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# define DC_REGCOUNT 256
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# else
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# define DC_REGCOUNT (UCHAR_MAX+1)
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# endif
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#endif /* not DC_REGCOUNT */
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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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