aa9bc17601
BMakefiles and other bits will follow. Requested by: Andrey Chernov Made world by: Chuck Robey
94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
/* mpz_set_d(integer, val) -- Assign INTEGER with a double value VAL.
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Copyright (C) 1995 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 the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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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 Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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#if __STDC__
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mpz_set_d (mpz_ptr r, double d)
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#else
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mpz_set_d (r, d)
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mpz_ptr r;
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double d;
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#endif
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{
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int negative;
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mp_size_t size;
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mp_limb_t tp[3];
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mp_ptr rp;
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negative = d < 0;
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d = ABS (d);
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/* Handle small arguments quickly. */
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if (d < MP_BASE_AS_DOUBLE)
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{
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mp_limb_t tmp;
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tmp = d;
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PTR(r)[0] = tmp;
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SIZ(r) = negative ? -(tmp != 0) : (tmp != 0);
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return;
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}
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size = __gmp_extract_double (tp, d);
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if (ALLOC(r) < size)
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_mpz_realloc (r, size);
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rp = PTR (r);
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#if BITS_PER_MP_LIMB == 32
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switch (size)
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{
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default:
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MPN_ZERO (rp, size - 3);
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rp += size - 3;
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case 3:
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rp[2] = tp[2];
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rp[1] = tp[1];
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rp[0] = tp[0];
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break;
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case 2:
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rp[1] = tp[2];
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rp[0] = tp[1];
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break;
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case 1:
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abort ();
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}
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#else
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switch (size)
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{
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default:
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MPN_ZERO (rp, size - 2);
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rp += size - 2;
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case 2:
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rp[1] = tp[1];
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rp[0] = tp[0];
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break;
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case 1:
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abort ();
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}
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#endif
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SIZ(r) = negative ? -size : size;
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}
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