version 1.1.1.1, 2000/01/10 15:35:27 |
version 1.1.1.3, 2003/08/25 16:06:32 |
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/* mpz_clrbit -- clear a specified bit. |
/* mpz_clrbit -- clear a specified bit. |
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Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc. |
Copyright 1991, 1993, 1994, 1995, 2001, 2002 Free 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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The GNU MP Library is free software; you can redistribute it and/or modify |
The GNU MP Library is free software; you can redistribute it and/or modify |
it under the terms of the GNU Library General Public License as published by |
it under the terms of the GNU Lesser General Public License as published by |
the Free Software Foundation; either version 2 of the License, or (at your |
the Free Software Foundation; either version 2.1 of the License, or (at your |
option) any later version. |
option) any later version. |
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The GNU MP Library is distributed in the hope that it will be useful, but |
The GNU MP Library is distributed in the hope that it will be useful, but |
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public |
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
License for more details. |
License for more details. |
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You should have received a copy of the GNU Library General Public License |
You should have received a copy of the GNU Lesser General Public License |
along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
MA 02111-1307, USA. */ |
MA 02111-1307, USA. */ |
Line 23 MA 02111-1307, USA. */ |
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Line 23 MA 02111-1307, USA. */ |
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#include "gmp-impl.h" |
#include "gmp-impl.h" |
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void |
void |
#if __STDC__ |
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mpz_clrbit (mpz_ptr d, unsigned long int bit_index) |
mpz_clrbit (mpz_ptr d, unsigned long int bit_index) |
#else |
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mpz_clrbit (d, bit_index) |
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mpz_ptr d; |
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unsigned long int bit_index; |
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#endif |
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{ |
{ |
mp_size_t dsize = d->_mp_size; |
mp_size_t dsize = d->_mp_size; |
mp_ptr dp = d->_mp_d; |
mp_ptr dp = d->_mp_d; |
mp_size_t limb_index; |
mp_size_t limb_index; |
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limb_index = bit_index / BITS_PER_MP_LIMB; |
limb_index = bit_index / GMP_NUMB_BITS; |
if (dsize >= 0) |
if (dsize >= 0) |
{ |
{ |
if (limb_index < dsize) |
if (limb_index < dsize) |
{ |
{ |
dp[limb_index] &= ~((mp_limb_t) 1 << (bit_index % BITS_PER_MP_LIMB)); |
dp[limb_index] &= ~((mp_limb_t) 1 << (bit_index % GMP_NUMB_BITS)); |
MPN_NORMALIZE (dp, dsize); |
MPN_NORMALIZE (dp, dsize); |
d->_mp_size = dsize; |
d->_mp_size = dsize; |
} |
} |
Line 67 mpz_clrbit (d, bit_index) |
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Line 61 mpz_clrbit (d, bit_index) |
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if (limb_index > zero_bound) |
if (limb_index > zero_bound) |
{ |
{ |
if (limb_index < dsize) |
if (limb_index < dsize) |
dp[limb_index] |= (mp_limb_t) 1 << (bit_index % BITS_PER_MP_LIMB); |
dp[limb_index] |= (mp_limb_t) 1 << (bit_index % GMP_NUMB_BITS); |
else |
else |
{ |
{ |
/* Ugh. The bit should be cleared outside of the end of the |
/* Ugh. The bit should be cleared outside of the end of the |
Line 78 mpz_clrbit (d, bit_index) |
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Line 72 mpz_clrbit (d, bit_index) |
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dp = d->_mp_d; |
dp = d->_mp_d; |
} |
} |
MPN_ZERO (dp + dsize, limb_index - dsize); |
MPN_ZERO (dp + dsize, limb_index - dsize); |
dp[limb_index] = (mp_limb_t) 1 << (bit_index % BITS_PER_MP_LIMB); |
dp[limb_index] = (mp_limb_t) 1 << (bit_index % GMP_NUMB_BITS); |
d->_mp_size = -(limb_index + 1); |
d->_mp_size = -(limb_index + 1); |
} |
} |
} |
} |
else if (limb_index == zero_bound) |
else if (limb_index == zero_bound) |
{ |
{ |
dp[limb_index] = ((dp[limb_index] - 1) |
dp[limb_index] = ((((dp[limb_index] - 1) |
| ((mp_limb_t) 1 << (bit_index % BITS_PER_MP_LIMB))) + 1; |
| ((mp_limb_t) 1 << (bit_index % GMP_NUMB_BITS))) + 1) |
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& GMP_NUMB_MASK); |
if (dp[limb_index] == 0) |
if (dp[limb_index] == 0) |
{ |
{ |
mp_size_t i; |
mp_size_t i; |
for (i = limb_index + 1; i < dsize; i++) |
for (i = limb_index + 1; i < dsize; i++) |
{ |
{ |
dp[i] += 1; |
dp[i] = (dp[i] + 1) & GMP_NUMB_MASK; |
if (dp[i] != 0) |
if (dp[i] != 0) |
goto fin; |
goto fin; |
} |
} |