Annotation of OpenXM_contrib/gmp/mpf/tests/ref.c, Revision 1.1
1.1 ! maekawa 1: /* Reference floating point routines.
! 2:
! 3: Copyright (C) 1996 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 Library General Public License as published by
! 9: the Free Software Foundation; either version 2 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 Library General Public
! 15: License for more details.
! 16:
! 17: You should have received a copy of the GNU Library 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:
! 25: #if __STDC__
! 26: void ref_mpf_add (mpf_t, const mpf_t, const mpf_t);
! 27: void ref_mpf_sub (mpf_t, const mpf_t, const mpf_t);
! 28: #else
! 29: void ref_mpf_add ();
! 30: void ref_mpf_sub ();
! 31: #endif
! 32:
! 33: void
! 34: #if __STDC__
! 35: ref_mpf_add (mpf_t w, const mpf_t u, const mpf_t v)
! 36: #else
! 37: ref_mpf_add (w, u, v)
! 38: mpf_t w;
! 39: const mpf_t u;
! 40: const mpf_t v;
! 41: #endif
! 42: {
! 43: mp_size_t hi, lo, size;
! 44: mp_ptr ut, vt, wt;
! 45: int neg;
! 46: mp_exp_t exp;
! 47: mp_limb_t cy;
! 48: TMP_DECL (mark);
! 49:
! 50: TMP_MARK (mark);
! 51:
! 52: if (SIZ (u) == 0)
! 53: {
! 54: size = ABSIZ (v);
! 55: wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
! 56: MPN_COPY (wt, PTR (v), size);
! 57: exp = EXP (v);
! 58: neg = SIZ (v) < 0;
! 59: goto done;
! 60: }
! 61: if (SIZ (v) == 0)
! 62: {
! 63: size = ABSIZ (u);
! 64: wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
! 65: MPN_COPY (wt, PTR (u), size);
! 66: exp = EXP (u);
! 67: neg = SIZ (u) < 0;
! 68: goto done;
! 69: }
! 70: if ((SIZ (u) ^ SIZ (v)) < 0)
! 71: {
! 72: mpf_t tmp;
! 73: SIZ (tmp) = -SIZ (v);
! 74: EXP (tmp) = EXP (v);
! 75: PTR (tmp) = PTR (v);
! 76: ref_mpf_sub (w, u, tmp);
! 77: return;
! 78: }
! 79: neg = SIZ (u) < 0;
! 80:
! 81: /* Compute the significance of the hi and lo end of the result. */
! 82: hi = MAX (EXP (u), EXP (v));
! 83: lo = MIN (EXP (u) - ABSIZ (u), EXP (v) - ABSIZ (v));
! 84: size = hi - lo;
! 85: ut = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
! 86: vt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
! 87: wt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
! 88: MPN_ZERO (ut, size);
! 89: MPN_ZERO (vt, size);
! 90: {int off;
! 91: off = size + (EXP (u) - hi) - ABSIZ (u);
! 92: MPN_COPY (ut + off, PTR (u), ABSIZ (u));
! 93: off = size + (EXP (v) - hi) - ABSIZ (v);
! 94: MPN_COPY (vt + off, PTR (v), ABSIZ (v));
! 95: }
! 96:
! 97: cy = mpn_add_n (wt, ut, vt, size);
! 98: wt[size] = cy;
! 99: size += cy;
! 100: exp = hi + cy;
! 101:
! 102: done:
! 103: if (size > PREC (w))
! 104: {
! 105: wt += size - PREC (w);
! 106: size = PREC (w);
! 107: }
! 108: MPN_COPY (PTR (w), wt, size);
! 109: SIZ (w) = neg == 0 ? size : -size;
! 110: EXP (w) = exp;
! 111: TMP_FREE (mark);
! 112: }
! 113:
! 114: void
! 115: #if __STDC__
! 116: ref_mpf_sub (mpf_t w, const mpf_t u, const mpf_t v)
! 117: #else
! 118: ref_mpf_sub (w, u, v)
! 119: mpf_t w;
! 120: const mpf_t u;
! 121: const mpf_t v;
! 122: #endif
! 123: {
! 124: mp_size_t hi, lo, size;
! 125: mp_ptr ut, vt, wt;
! 126: int neg;
! 127: mp_exp_t exp;
! 128: TMP_DECL (mark);
! 129:
! 130: TMP_MARK (mark);
! 131:
! 132: if (SIZ (u) == 0)
! 133: {
! 134: size = ABSIZ (v);
! 135: wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
! 136: MPN_COPY (wt, PTR (v), size);
! 137: exp = EXP (v);
! 138: neg = SIZ (v) > 0;
! 139: goto done;
! 140: }
! 141: if (SIZ (v) == 0)
! 142: {
! 143: size = ABSIZ (u);
! 144: wt = (mp_ptr) TMP_ALLOC (size * BYTES_PER_MP_LIMB);
! 145: MPN_COPY (wt, PTR (u), size);
! 146: exp = EXP (u);
! 147: neg = SIZ (u) < 0;
! 148: goto done;
! 149: }
! 150: if ((SIZ (u) ^ SIZ (v)) < 0)
! 151: {
! 152: mpf_t tmp;
! 153: SIZ (tmp) = -SIZ (v);
! 154: EXP (tmp) = EXP (v);
! 155: PTR (tmp) = PTR (v);
! 156: ref_mpf_add (w, u, tmp);
! 157: if (SIZ (u) < 0)
! 158: mpf_neg (w, w);
! 159: return;
! 160: }
! 161: neg = SIZ (u) < 0;
! 162:
! 163: /* Compute the significance of the hi and lo end of the result. */
! 164: hi = MAX (EXP (u), EXP (v));
! 165: lo = MIN (EXP (u) - ABSIZ (u), EXP (v) - ABSIZ (v));
! 166: size = hi - lo;
! 167: ut = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
! 168: vt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
! 169: wt = (mp_ptr) TMP_ALLOC ((size + 1) * BYTES_PER_MP_LIMB);
! 170: MPN_ZERO (ut, size);
! 171: MPN_ZERO (vt, size);
! 172: {int off;
! 173: off = size + (EXP (u) - hi) - ABSIZ (u);
! 174: MPN_COPY (ut + off, PTR (u), ABSIZ (u));
! 175: off = size + (EXP (v) - hi) - ABSIZ (v);
! 176: MPN_COPY (vt + off, PTR (v), ABSIZ (v));
! 177: }
! 178:
! 179: if (mpn_cmp (ut, vt, size) >= 0)
! 180: mpn_sub_n (wt, ut, vt, size);
! 181: else
! 182: {
! 183: mpn_sub_n (wt, vt, ut, size);
! 184: neg ^= 1;
! 185: }
! 186: exp = hi;
! 187: while (size != 0 && wt[size - 1] == 0)
! 188: {
! 189: size--;
! 190: exp--;
! 191: }
! 192:
! 193: done:
! 194: if (size > PREC (w))
! 195: {
! 196: wt += size - PREC (w);
! 197: size = PREC (w);
! 198: }
! 199: MPN_COPY (PTR (w), wt, size);
! 200: SIZ (w) = neg == 0 ? size : -size;
! 201: EXP (w) = exp;
! 202: TMP_FREE (mark);
! 203: }
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