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Annotation of OpenXM_contrib/gmp/tests/refmpf.c, Revision 1.1

1.1     ! ohara       1: /* Reference floating point routines.
        !             2:
        !             3: Copyright 1996, 2001 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include "gmp.h"
        !            23: #include "gmp-impl.h"
        !            24: #include "tests.h"
        !            25:
        !            26:
        !            27: void
        !            28: refmpf_add (mpf_ptr w, mpf_srcptr u, mpf_srcptr v)
        !            29: {
        !            30:   mp_size_t hi, lo, size;
        !            31:   mp_ptr ut, vt, wt;
        !            32:   int neg;
        !            33:   mp_exp_t exp;
        !            34:   mp_limb_t cy;
        !            35:   TMP_DECL (mark);
        !            36:
        !            37:   TMP_MARK (mark);
        !            38:
        !            39:   if (SIZ (u) == 0)
        !            40:     {
        !            41:       size = ABSIZ (v);
        !            42:       wt = (mp_ptr) TMP_ALLOC ((size+1) * BYTES_PER_MP_LIMB);
        !            43:       MPN_COPY (wt, PTR (v), size);
        !            44:       exp = EXP (v);
        !            45:       neg = SIZ (v) < 0;
        !            46:       goto done;
        !            47:     }
        !            48:   if (SIZ (v) == 0)
        !            49:     {
        !            50:       size = ABSIZ (u);
        !            51:       wt = (mp_ptr) TMP_ALLOC ((size+1) * BYTES_PER_MP_LIMB);
        !            52:       MPN_COPY (wt, PTR (u), size);
        !            53:       exp = EXP (u);
        !            54:       neg = SIZ (u) < 0;
        !            55:       goto done;
        !            56:     }
        !            57:   if ((SIZ (u) ^ SIZ (v)) < 0)
        !            58:     {
        !            59:       mpf_t tmp;
        !            60:       SIZ (tmp) = -SIZ (v);
        !            61:       EXP (tmp) = EXP (v);
        !            62:       PTR (tmp) = PTR (v);
        !            63:       refmpf_sub (w, u, tmp);
        !            64:       return;
        !            65:     }
        !            66:   neg = SIZ (u) < 0;
        !            67:
        !            68:   /* Compute the significance of the hi and lo end of the result.  */
        !            69:   hi = MAX (EXP (u), EXP (v));
        !            70:   lo = MIN (EXP (u) - ABSIZ (u), EXP (v) - ABSIZ (v));
        !            71:   size = hi - lo;
        !            72:   ut = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
        !            73:   vt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
        !            74:   wt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
        !            75:   MPN_ZERO (ut, size);
        !            76:   MPN_ZERO (vt, size);
        !            77:   {int off;
        !            78:   off = size + (EXP (u) - hi) - ABSIZ (u);
        !            79:   MPN_COPY (ut + off, PTR (u), ABSIZ (u));
        !            80:   off = size + (EXP (v) - hi) - ABSIZ (v);
        !            81:   MPN_COPY (vt + off, PTR (v), ABSIZ (v));
        !            82:   }
        !            83:
        !            84:   cy = mpn_add_n (wt, ut, vt, size);
        !            85:   wt[size] = cy;
        !            86:   size += cy;
        !            87:   exp = hi + cy;
        !            88:
        !            89: done:
        !            90:   if (size > PREC (w))
        !            91:     {
        !            92:       wt += size - PREC (w);
        !            93:       size = PREC (w);
        !            94:     }
        !            95:   MPN_COPY (PTR (w), wt, size);
        !            96:   SIZ (w) = neg == 0 ? size : -size;
        !            97:   EXP (w) = exp;
        !            98:   TMP_FREE (mark);
        !            99: }
        !           100:
        !           101: void
        !           102: refmpf_sub (mpf_ptr w, mpf_srcptr u, mpf_srcptr v)
        !           103: {
        !           104:   mp_size_t hi, lo, size;
        !           105:   mp_ptr ut, vt, wt;
        !           106:   int neg;
        !           107:   mp_exp_t exp;
        !           108:   TMP_DECL (mark);
        !           109:
        !           110:   TMP_MARK (mark);
        !           111:
        !           112:   if (SIZ (u) == 0)
        !           113:     {
        !           114:       size = ABSIZ (v);
        !           115:       wt = (mp_ptr) TMP_ALLOC ((size+1) * BYTES_PER_MP_LIMB);
        !           116:       MPN_COPY (wt, PTR (v), size);
        !           117:       exp = EXP (v);
        !           118:       neg = SIZ (v) > 0;
        !           119:       goto done;
        !           120:     }
        !           121:   if (SIZ (v) == 0)
        !           122:     {
        !           123:       size = ABSIZ (u);
        !           124:       wt = (mp_ptr) TMP_ALLOC ((size+1) * BYTES_PER_MP_LIMB);
        !           125:       MPN_COPY (wt, PTR (u), size);
        !           126:       exp = EXP (u);
        !           127:       neg = SIZ (u) < 0;
        !           128:       goto done;
        !           129:     }
        !           130:   if ((SIZ (u) ^ SIZ (v)) < 0)
        !           131:     {
        !           132:       mpf_t tmp;
        !           133:       SIZ (tmp) = -SIZ (v);
        !           134:       EXP (tmp) = EXP (v);
        !           135:       PTR (tmp) = PTR (v);
        !           136:       refmpf_add (w, u, tmp);
        !           137:       if (SIZ (u) < 0)
        !           138:        mpf_neg (w, w);
        !           139:       return;
        !           140:     }
        !           141:   neg = SIZ (u) < 0;
        !           142:
        !           143:   /* Compute the significance of the hi and lo end of the result.  */
        !           144:   hi = MAX (EXP (u), EXP (v));
        !           145:   lo = MIN (EXP (u) - ABSIZ (u), EXP (v) - ABSIZ (v));
        !           146:   size = hi - lo;
        !           147:   ut = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
        !           148:   vt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
        !           149:   wt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
        !           150:   MPN_ZERO (ut, size);
        !           151:   MPN_ZERO (vt, size);
        !           152:   {int off;
        !           153:   off = size + (EXP (u) - hi) - ABSIZ (u);
        !           154:   MPN_COPY (ut + off, PTR (u), ABSIZ (u));
        !           155:   off = size + (EXP (v) - hi) - ABSIZ (v);
        !           156:   MPN_COPY (vt + off, PTR (v), ABSIZ (v));
        !           157:   }
        !           158:
        !           159:   if (mpn_cmp (ut, vt, size) >= 0)
        !           160:     mpn_sub_n (wt, ut, vt, size);
        !           161:   else
        !           162:     {
        !           163:       mpn_sub_n (wt, vt, ut, size);
        !           164:       neg ^= 1;
        !           165:     }
        !           166:   exp = hi;
        !           167:   while (size != 0 && wt[size - 1] == 0)
        !           168:     {
        !           169:       size--;
        !           170:       exp--;
        !           171:     }
        !           172:
        !           173: done:
        !           174:   if (size > PREC (w))
        !           175:     {
        !           176:       wt += size - PREC (w);
        !           177:       size = PREC (w);
        !           178:     }
        !           179:   MPN_COPY (PTR (w), wt, size);
        !           180:   SIZ (w) = neg == 0 ? size : -size;
        !           181:   EXP (w) = exp;
        !           182:   TMP_FREE (mark);
        !           183: }

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