version 1.1.1.1, 2000/09/09 14:12:19 |
version 1.1.1.2, 2003/08/25 16:06:07 |
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/* mpfr_set_si, mpfr_set_ui -- set a MPFR number from a machine integer |
/* mpfr_set_si -- set a MPFR number from a machine signed integer |
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Copyright (C) 1999 PolKA project, Inria Lorraine and Loria |
Copyright 1999, 2000, 2001 Free Software Foundation. |
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This file is part of the MPFR Library. |
This file is part of the MPFR Library. |
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The MPFR Library is free software; you can redistribute it and/or modify |
The MPFR 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 MPFR Library is distributed in the hope that it will be useful, but |
The MPFR 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 MPFR Library; see the file COPYING.LIB. If not, write to |
along with the MPFR 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. */ |
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#include <stdio.h> |
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#include "gmp.h" |
#include "gmp.h" |
#include "gmp-impl.h" |
#include "gmp-impl.h" |
#include "longlong.h" |
#include "longlong.h" |
#include "mpfr.h" |
#include "mpfr.h" |
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#include "mpfr-impl.h" |
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void |
int |
#if __STDC__ |
mpfr_set_si (mpfr_ptr x, long i, mp_rnd_t rnd_mode) |
mpfr_set_si(mpfr_ptr x, long i, unsigned char rnd_mode) |
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#else |
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mpfr_set_si(x, i, rnd_mode) |
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mpfr_ptr x; |
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long i; |
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unsigned char rnd_mode; |
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#endif |
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{ |
{ |
unsigned long xn, cnt; mp_limb_t ai; |
int inex; |
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mp_size_t xn; |
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unsigned int cnt, nbits; |
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mp_limb_t ai, *xp; |
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if (i==0) { SET_ZERO(x); return; } |
MPFR_CLEAR_FLAGS(x); |
xn = (PREC(x)-1)/BITS_PER_MP_LIMB; |
if (i == 0) |
ai = ABS(i); |
{ |
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MPFR_SET_ZERO(x); |
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MPFR_SET_POS(x); |
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MPFR_RET(0); |
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} |
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count_leading_zeros(cnt, ai); |
xn = (MPFR_PREC(x)-1)/BITS_PER_MP_LIMB; |
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ai = SAFE_ABS(long, i); |
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count_leading_zeros(cnt, ai); |
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x -> _mp_d[xn] = ai << cnt; |
xp = MPFR_MANT(x); |
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xp[xn] = ai << cnt; |
/* don't forget to put zero in lower limbs */ |
/* don't forget to put zero in lower limbs */ |
MPN_ZERO(MANT(x), xn); |
MPN_ZERO(xp, xn); |
x -> _mp_exp = BITS_PER_MP_LIMB - cnt; |
/* set sign */ |
/* warning: don't change the precision of x! */ |
if ((i < 0) ^ (MPFR_SIGN(x) < 0)) |
if (i*SIGN(x) < 0) CHANGE_SIGN(x); |
MPFR_CHANGE_SIGN(x); |
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return; |
MPFR_EXP(x) = nbits = BITS_PER_MP_LIMB - cnt; |
} |
inex = mpfr_check_range(x, rnd_mode); |
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if (inex) |
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return inex; /* underflow or overflow */ |
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void |
/* round if MPFR_PREC(x) smaller than length of i */ |
#if __STDC__ |
if (MPFR_PREC(x) < nbits) |
mpfr_set_ui(mpfr_ptr x, unsigned long i, unsigned char rnd_mode) |
{ |
#else |
int carry; |
mpfr_set_ui(x, i, rnd_mode) |
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mpfr_ptr x; |
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long i; |
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unsigned char rnd_mode; |
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#endif |
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{ |
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unsigned int xn, cnt; |
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if (i==0) { SET_ZERO(x); return; } |
carry = mpfr_round_raw(xp+xn, xp+xn, nbits, (i < 0), MPFR_PREC(x), |
xn = (PREC(x)-1)/BITS_PER_MP_LIMB; |
rnd_mode, &inex); |
count_leading_zeros(cnt, (mp_limb_t) i); |
if (carry) |
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{ |
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mp_exp_t exp = MPFR_EXP(x); |
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x -> _mp_d[xn] = ((mp_limb_t) i) << cnt; |
if (exp == __mpfr_emax) |
/* don't forget to put zero in lower limbs */ |
return mpfr_set_overflow(x, rnd_mode, (i < 0 ? -1 : 1)); |
MPN_ZERO(MANT(x), xn); |
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x -> _mp_exp = BITS_PER_MP_LIMB - cnt; |
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/* warning: don't change the precision of x! */ |
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if (SIGN(x) < 0) CHANGE_SIGN(x); |
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return; |
MPFR_EXP(x)++; |
} |
xp[xn] = GMP_LIMB_HIGHBIT; |
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} |
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} |
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MPFR_RET(inex); |
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} |