version 1.1.1.1, 2000/01/10 15:35:27 |
version 1.1.1.3, 2003/08/25 16:06:33 |
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/* mpz_get_si(integer) -- Return the least significant digit from INTEGER. |
/* mpz_get_si(integer) -- Return the least significant digit from INTEGER. |
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Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc. |
Copyright 1991, 1993, 1994, 1995, 2000, 2001, 2002 Free Software Foundation, |
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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 24 MA 02111-1307, USA. */ |
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#include "gmp-impl.h" |
#include "gmp-impl.h" |
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signed long int |
signed long int |
#if __STDC__ |
mpz_get_si (mpz_srcptr z) |
mpz_get_si (mpz_srcptr op) |
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#else |
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mpz_get_si (op) |
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mpz_srcptr op; |
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#endif |
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{ |
{ |
mp_size_t size = op->_mp_size; |
mp_ptr zp = z->_mp_d; |
mp_limb_t low_limb = op->_mp_d[0]; |
mp_size_t size = z->_mp_size; |
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mp_limb_t zl = zp[0]; |
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#if GMP_NAIL_BITS != 0 |
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if (ULONG_MAX > GMP_NUMB_MAX != 0 && ABS (size) >= 2) |
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zl |= zp[1] << GMP_NUMB_BITS; |
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#endif |
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if (size > 0) |
if (size > 0) |
return low_limb % ((mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1)); |
return (long) zl & LONG_MAX; |
else if (size < 0) |
else if (size < 0) |
/* This convoluted expression is necessary to properly handle 0x80000000 */ |
/* This expression is necessary to properly handle 0x80000000 */ |
return ~((low_limb - 1) % ((mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1))); |
return ~(((long) zl - 1L) & LONG_MAX); |
else |
else |
return 0; |
return 0; |
} |
} |