version 1.1.1.2, 2000/09/09 14:12:50 |
version 1.1.1.3, 2003/08/25 16:06:33 |
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/* mpz_divexact -- finds quotient when known that quot * den == num && den != 0. |
/* mpz_divexact -- finds quotient when known that quot * den == num && den != 0. |
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Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 2000 Free Software |
Copyright 1991, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002 Free |
Foundation, Inc. |
Software Foundation, Inc. |
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This file is part of the GNU MP Library. |
This file is part of the GNU MP Library. |
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Line 36 MA 02111-1307, USA. */ |
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Line 36 MA 02111-1307, USA. */ |
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#include "longlong.h" |
#include "longlong.h" |
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void |
void |
#if __STDC__ |
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mpz_divexact (mpz_ptr quot, mpz_srcptr num, mpz_srcptr den) |
mpz_divexact (mpz_ptr quot, mpz_srcptr num, mpz_srcptr den) |
#else |
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mpz_divexact (quot, num, den) |
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mpz_ptr quot; |
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mpz_srcptr num; |
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mpz_srcptr den; |
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#endif |
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{ |
{ |
mp_ptr qp, tp; |
mp_ptr qp, tp; |
mp_size_t qsize, tsize; |
mp_size_t qsize, tsize; |
Line 74 mpz_divexact (quot, num, den) |
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Line 67 mpz_divexact (quot, num, den) |
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{ |
{ |
if (dsize == 1) |
if (dsize == 1) |
{ |
{ |
mpn_divmod_1 (qp, np, nsize, dp[0]); |
MPN_DIVREM_OR_DIVEXACT_1 (qp, np, nsize, dp[0]); |
qsize -= qp[qsize - 1] == 0; |
qsize -= qp[qsize - 1] == 0; |
quot->_mp_size = (num->_mp_size ^ den->_mp_size) >= 0 ? qsize : -qsize; |
quot->_mp_size = (num->_mp_size ^ den->_mp_size) >= 0 ? qsize : -qsize; |
return; |
return; |
Line 109 mpz_divexact (quot, num, den) |
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Line 102 mpz_divexact (quot, num, den) |
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count_trailing_zeros (r, dp[0]); |
count_trailing_zeros (r, dp[0]); |
mpn_rshift (tp, dp, tsize, r); |
mpn_rshift (tp, dp, tsize, r); |
if (dsize > tsize) |
if (dsize > tsize) |
tp[tsize - 1] |= dp[tsize] << (BITS_PER_MP_LIMB - r); |
tp[tsize - 1] |= (dp[tsize] << (GMP_NUMB_BITS - r)) & GMP_NUMB_MASK; |
mpn_rshift (qp, np, qsize, r); |
mpn_rshift (qp, np, qsize, r); |
if (nsize > qsize) |
if (nsize > qsize) |
qp[qsize - 1] |= np[qsize] << (BITS_PER_MP_LIMB - r); |
qp[qsize - 1] |= (np[qsize] << (GMP_NUMB_BITS - r)) & GMP_NUMB_MASK; |
} |
} |
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/* Now QUOT <-- QUOT/T. */ |
/* Now QUOT <-- QUOT/T. */ |
mpn_bdivmod (qp, qp, qsize, tp, tsize, qsize * BITS_PER_MP_LIMB); |
mpn_bdivmod (qp, qp, qsize, tp, tsize, qsize * GMP_NUMB_BITS); |
MPN_NORMALIZE (qp, qsize); |
MPN_NORMALIZE (qp, qsize); |
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quot->_mp_size = (num->_mp_size ^ den->_mp_size) >= 0 ? qsize : -qsize; |
quot->_mp_size = (num->_mp_size ^ den->_mp_size) >= 0 ? qsize : -qsize; |