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annotate libquadmath/printf/add_n.c @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
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children
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68
561a7518be6b update gcc-4.6
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* mpn_add_n -- Add two limb vectors of equal, non-zero length.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 This file is part of the GNU MP Library.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 The GNU MP Library is free software; you can redistribute it and/or modify
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 it under the terms of the GNU Lesser General Public License as published by
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 the Free Software Foundation; either version 2.1 of the License, or (at your
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 option) any later version.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 The GNU MP Library is distributed in the hope that it will be useful, but
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 License for more details.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 You should have received a copy of the GNU Lesser General Public License
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 MA 02111-1307, USA. */
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21
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 #include <config.h>
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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23 #include "gmp-impl.h"
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24
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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25 mp_limb_t
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 #if __STDC__
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, mp_size_t size)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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28 #else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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29 mpn_add_n (res_ptr, s1_ptr, s2_ptr, size)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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30 register mp_ptr res_ptr;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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31 register mp_srcptr s1_ptr;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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32 register mp_srcptr s2_ptr;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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33 mp_size_t size;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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34 #endif
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35 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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36 register mp_limb_t x, y, cy;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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37 register mp_size_t j;
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38
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39 /* The loop counter and index J goes from -SIZE to -1. This way
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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40 the loop becomes faster. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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41 j = -size;
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42
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 /* Offset the base pointers to compensate for the negative indices. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 s1_ptr -= j;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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45 s2_ptr -= j;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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46 res_ptr -= j;
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47
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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48 cy = 0;
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49 do
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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50 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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51 y = s2_ptr[j];
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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52 x = s1_ptr[j];
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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53 y += cy; /* add previous carry to one addend */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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54 cy = (y < cy); /* get out carry from that addition */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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55 y = x + y; /* add other addend */
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56 cy = (y < x) + cy; /* get out carry from that add, combine */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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57 res_ptr[j] = y;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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58 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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59 while (++j != 0);
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60
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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61 return cy;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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62 }