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f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* mpz_get_si(integer) -- Return the least significant digit from INTEGER.
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Copyright 1991, 1993-1995, 2000-2002, 2006, 2012 Free Software Foundation, Inc.
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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
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp.h"
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#include "gmp-impl.h"
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signed long int
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mpz_get_si (mpz_srcptr z) __GMP_NOTHROW
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{
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mp_ptr zp = PTR (z);
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mp_size_t size = SIZ (z);
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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 && 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)
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return zl & LONG_MAX;
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else if (size < 0)
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/* This expression is necessary to properly handle 0x80000000 */
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return -1 - (long) ((zl - 1) & LONG_MAX);
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else
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return 0;
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}
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