version 1.1, 2000/01/10 15:35:27 |
version 1.1.1.3, 2003/08/25 16:06:33 |
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/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT. |
/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT. |
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Copyright (C) 1996 Free Software Foundation, Inc. |
Copyright 1996, 2001 Free Software 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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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 22 MA 02111-1307, USA. */ |
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Line 22 MA 02111-1307, USA. */ |
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#include "gmp.h" |
#include "gmp.h" |
#include "gmp-impl.h" |
#include "gmp-impl.h" |
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void |
void |
#if __STDC__ |
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mpz_set_f (mpz_ptr w, mpf_srcptr u) |
mpz_set_f (mpz_ptr w, mpf_srcptr u) |
#else |
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mpz_set_f (w, u) |
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mpz_ptr w; |
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mpf_srcptr u; |
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#endif |
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{ |
{ |
mp_ptr wp, up; |
mp_ptr wp, up; |
mp_size_t usize, size; |
mp_size_t size; |
mp_exp_t exp; |
mp_exp_t exp; |
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usize = SIZ (u); |
/* abs(u)<1 truncates to zero */ |
size = ABS (usize); |
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exp = EXP (u); |
exp = EXP (u); |
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if (w->_mp_alloc < exp) |
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_mpz_realloc (w, exp); |
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wp = w->_mp_d; |
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up = u->_mp_d; |
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if (exp <= 0) |
if (exp <= 0) |
{ |
{ |
SIZ (w) = 0; |
SIZ(w) = 0; |
return; |
return; |
} |
} |
if (exp < size) |
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MPZ_REALLOC (w, exp); |
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wp = PTR(w); |
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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) |
{ |
{ |
MPN_COPY (wp, up + size - exp, exp); |
/* 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; |
} |
} |
else |
else |
{ |
{ |
MPN_ZERO (wp, exp - size); |
/* exp<=size, trucate to the high "exp" many limbs */ |
MPN_COPY (wp + exp - size, up, size); |
up += (size - exp); |
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size = exp; |
} |
} |
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w->_mp_size = usize >= 0 ? exp : -exp; |
MPN_COPY (wp, up, size); |
} |
} |