version 1.1.1.2, 2000/09/09 14:12:58 |
version 1.1.1.3, 2003/08/25 16:06:34 |
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/* mpz_setbit -- set a specified bit. |
/* mpz_setbit -- set a specified bit. |
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Copyright (C) 1991, 1993, 1994, 1995, 1997, 1999 Free Software Foundation, |
Copyright 1991, 1993, 1994, 1995, 1997, 1999, 2001, 2002 Free Software |
Inc. |
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 24 MA 02111-1307, USA. */ |
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Line 24 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_setbit (mpz_ptr d, unsigned long int bit_index) |
mpz_setbit (mpz_ptr d, unsigned long int bit_index) |
#else |
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mpz_setbit (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); |
d->_mp_size = dsize; |
d->_mp_size = dsize; |
} |
} |
else |
else |
Line 54 mpz_setbit (d, bit_index) |
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Line 48 mpz_setbit (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; |
} |
} |
} |
} |
Line 78 mpz_setbit (d, bit_index) |
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Line 72 mpz_setbit (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)); |
{ |
else |
dp[limb_index] &= ~((mp_limb_t) 1 << (bit_index % GMP_NUMB_BITS)); |
; |
MPN_NORMALIZE (dp, dsize); |
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d->_mp_size = -dsize; |
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} |
} |
} |
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; |
if (dp[limb_index] == 0) |
if (dp[limb_index] == 0) |
{ |
{ |
mp_size_t i; |
mp_size_t i; |
Line 111 mpz_setbit (d, bit_index) |
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Line 107 mpz_setbit (d, bit_index) |
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else |
else |
{ |
{ |
mpn_decr_u (dp + limb_index, |
mpn_decr_u (dp + limb_index, |
(mp_limb_t) 1 << (bit_index % BITS_PER_MP_LIMB)); |
(mp_limb_t) 1 << (bit_index % GMP_NUMB_BITS)); |
dsize -= dp[dsize - 1] == 0; |
dsize -= dp[dsize - 1] == 0; |
d->_mp_size = -dsize; |
d->_mp_size = -dsize; |
} |
} |