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70 lines
1.8 KiB
Plaintext
70 lines
1.8 KiB
Plaintext
NAME
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hnrmod - compute mod h * 2^n +r
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SYNOPSIS
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hnrmod(v, h, n, r)
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TYPES
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v integer
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h integer
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n integer
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r integer
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return integer
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DESCRIPTION
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Compute the value:
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v % (h * 2^n +r)
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where:
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h > 0
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n > 0
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r == -1, 0 or 1
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This builtin in faster than the standard mod in that is makes use
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of shifts and additions when h == 1. When h > 1, a division by h
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is also needed.
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EXAMPLE
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; print hnrmod(2^177-1, 1, 177, -1), hnrmod(10^40, 17, 51, 1)
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0 33827019788296445
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LIMITS
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h > 0
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2^31 > n > 0
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r == -1, 0 or 1
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LINK LIBRARY
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void zhnrmod(ZVALUE v, ZVALUE h, ZVALUE zn, ZVALUE zr, ZVALUE *res)
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SEE ALSO
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mod
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## Copyright (C) 1999 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## @(#) $Revision: 30.1 $
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## @(#) $Id: hnrmod,v 30.1 2007/03/16 11:10:42 chongo Exp $
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## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/hnrmod,v $
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##
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## Under source code control: 1997/07/02 07:10:43
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## File existed as early as: 1997
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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