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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
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
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Copyright 1996, 2001, 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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void
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mpz_set_f (mpz_ptr w, mpf_srcptr u)
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{
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mp_ptr wp, up;
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mp_size_t size;
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mp_exp_t exp;
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/* abs(u)<1 truncates to zero */
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exp = EXP (u);
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if (exp <= 0)
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{
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SIZ(w) = 0;
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return;
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}
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wp = MPZ_REALLOC (w, exp);
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up = PTR(u);
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size = SIZ (u);
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SIZ(w) = (size >= 0 ? exp : -exp);
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size = ABS (size);
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if (exp > size)
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{
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/* pad with low zeros to get a total "exp" many limbs */
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mp_size_t zeros = exp - size;
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MPN_ZERO (wp, zeros);
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wp += zeros;
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}
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else
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{
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/* exp<=size, truncate to the high "exp" many limbs */
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up += (size - exp);
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size = exp;
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}
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MPN_COPY (wp, up, size);
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}
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