145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/* mpf_add_ui -- Add a float and an unsigned integer.
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Copyright 1993, 1994, 1996, 2000, 2001 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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser 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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "mpir.h"
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#include "gmp-impl.h"
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void
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mpf_add_ui (mpf_ptr sum, mpf_srcptr u, mpir_ui v)
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{
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mp_srcptr up = u->_mp_d;
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mp_ptr sump = sum->_mp_d;
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mp_size_t usize, sumsize;
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mp_size_t prec = sum->_mp_prec;
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mp_exp_t uexp = u->_mp_exp;
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usize = u->_mp_size;
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if (usize <= 0)
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{
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if (usize == 0)
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{
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mpf_set_ui (sum, v);
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return;
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}
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else
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{
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__mpf_struct u_negated;
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u_negated._mp_size = -usize;
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u_negated._mp_exp = u->_mp_exp;
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u_negated._mp_d = u->_mp_d;
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mpf_sub_ui (sum, &u_negated, v);
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sum->_mp_size = -(sum->_mp_size);
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return;
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}
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}
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if (v == 0)
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{
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sum_is_u:
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if (u != sum)
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{
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sumsize = MIN (usize, prec + 1);
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MPN_COPY (sum->_mp_d, up + usize - sumsize, sumsize);
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sum->_mp_size = sumsize;
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sum->_mp_exp = u->_mp_exp;
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}
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return;
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}
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if (uexp > 0)
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{
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/* U >= 1. */
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if (uexp > prec)
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{
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/* U >> V, V is not part of final result. */
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goto sum_is_u;
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}
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else
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{
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/* U's "limb point" is somewhere between the first limb
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and the PREC:th limb.
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Both U and V are part of the final result. */
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if (uexp > usize)
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{
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/* uuuuuu0000. */
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/* + v. */
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/* We begin with moving U to the top of SUM, to handle
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samevar(U,SUM). */
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MPN_COPY_DECR (sump + uexp - usize, up, usize);
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sump[0] = v;
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MPN_ZERO (sump + 1, uexp - usize - 1);
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#if 0 /* What is this??? */
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if (sum == u)
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MPN_COPY (sum->_mp_d, sump, uexp);
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#endif
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sum->_mp_size = uexp;
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sum->_mp_exp = uexp;
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}
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else
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{
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/* uuuuuu.uuuu */
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/* + v. */
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mp_limb_t cy_limb;
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if (usize > prec)
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{
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/* Ignore excess limbs in U. */
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up += usize - prec;
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usize -= usize - prec; /* Eq. usize = prec */
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}
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if (sump != up)
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MPN_COPY_INCR (sump, up, usize - uexp);
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cy_limb = mpn_add_1 (sump + usize - uexp, up + usize - uexp,
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uexp, (mp_limb_t) v);
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sump[usize] = cy_limb;
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sum->_mp_size = usize + cy_limb;
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sum->_mp_exp = uexp + cy_limb;
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}
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}
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}
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else
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{
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/* U < 1, so V > U for sure. */
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/* v. */
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/* .0000uuuu */
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if ((-uexp) >= prec)
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{
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sump[0] = v;
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sum->_mp_size = 1;
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sum->_mp_exp = 1;
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}
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else
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{
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if (usize + (-uexp) + 1 > prec)
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{
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/* Ignore excess limbs in U. */
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up += usize + (-uexp) + 1 - prec;
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usize -= usize + (-uexp) + 1 - prec;
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}
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if (sump != up)
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MPN_COPY_INCR (sump, up, usize);
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MPN_ZERO (sump + usize, -uexp);
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sump[usize + (-uexp)] = v;
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sum->_mp_size = usize + (-uexp) + 1;
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sum->_mp_exp = 1;
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}
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}
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}
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