Update the in-tree GMP; fixes trac #832

[ghc-hetmet.git] / rts / gmp / mpn / generic / udiv_w_sdiv.c

diff --git a/rts/gmp/mpn/generic/udiv_w_sdiv.c b/rts/gmp/mpn/generic/udiv_w_sdiv.c
deleted file mode 100644 (file)
index 061cce8..0000000
--- a/rts/gmp/mpn/generic/udiv_w_sdiv.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/* mpn_udiv_w_sdiv -- implement udiv_qrnnd on machines with only signed
-   division.
-
-   Contributed by Peter L. Montgomery.
-
-   THIS IS AN INTERNAL FUNCTION WITH A MUTABLE INTERFACE.  IT IS ONLY SAFE
-   TO REACH THIS FUNCTION THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS
-   ALMOST GUARANTEED THAT THIS FUNCTION WILL CHANGE OR DISAPPEAR IN A FUTURE
-   GNU MP RELEASE.
-
-
-Copyright (C) 1992, 1994, 1996, 2000 Free Software Foundation, Inc.
-
-This file is part of the GNU MP Library.
-
-The GNU MP Library is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 2.1 of the License, or (at your
-option) any later version.
-
-The GNU MP Library is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
-License for more details.
-
-You should have received a copy of the GNU Lesser General Public License
-along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-MA 02111-1307, USA. */
-
-#include "gmp.h"
-#include "gmp-impl.h"
-#include "longlong.h"
-
-mp_limb_t
-mpn_udiv_w_sdiv (rp, a1, a0, d)
-     mp_limb_t *rp, a1, a0, d;
-{
-  mp_limb_t q, r;
-  mp_limb_t c0, c1, b1;
-
-  if ((mp_limb_signed_t) d >= 0)
-    {
-      if (a1 < d - a1 - (a0 >> (BITS_PER_MP_LIMB - 1)))
-       {
-         /* dividend, divisor, and quotient are nonnegative */
-         sdiv_qrnnd (q, r, a1, a0, d);
-       }
-      else
-       {
-         /* Compute c1*2^32 + c0 = a1*2^32 + a0 - 2^31*d */
-         sub_ddmmss (c1, c0, a1, a0, d >> 1, d << (BITS_PER_MP_LIMB - 1));
-         /* Divide (c1*2^32 + c0) by d */
-         sdiv_qrnnd (q, r, c1, c0, d);
-         /* Add 2^31 to quotient */
-         q += (mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1);
-       }
-    }
-  else
-    {
-      b1 = d >> 1;                     /* d/2, between 2^30 and 2^31 - 1 */
-      c1 = a1 >> 1;                    /* A/2 */
-      c0 = (a1 << (BITS_PER_MP_LIMB - 1)) + (a0 >> 1);
-
-      if (a1 < b1)                     /* A < 2^32*b1, so A/2 < 2^31*b1 */
-       {
-         sdiv_qrnnd (q, r, c1, c0, b1); /* (A/2) / (d/2) */
-
-         r = 2*r + (a0 & 1);           /* Remainder from A/(2*b1) */
-         if ((d & 1) != 0)
-           {
-             if (r >= q)
-               r = r - q;
-             else if (q - r <= d)
-               {
-                 r = r - q + d;
-                 q--;
-               }
-             else
-               {
-                 r = r - q + 2*d;
-                 q -= 2;
-               }
-           }
-       }
-      else if (c1 < b1)                        /* So 2^31 <= (A/2)/b1 < 2^32 */
-       {
-         c1 = (b1 - 1) - c1;
-         c0 = ~c0;                     /* logical NOT */
-
-         sdiv_qrnnd (q, r, c1, c0, b1); /* (A/2) / (d/2) */
-
-         q = ~q;                       /* (A/2)/b1 */
-         r = (b1 - 1) - r;
-
-         r = 2*r + (a0 & 1);           /* A/(2*b1) */
-
-         if ((d & 1) != 0)
-           {
-             if (r >= q)
-               r = r - q;
-             else if (q - r <= d)
-               {
-                 r = r - q + d;
-                 q--;
-               }
-             else
-               {
-                 r = r - q + 2*d;
-                 q -= 2;
-               }
-           }
-       }
-      else                             /* Implies c1 = b1 */
-       {                               /* Hence a1 = d - 1 = 2*b1 - 1 */
-         if (a0 >= -d)
-           {
-             q = -1;
-             r = a0 + d;
-           }
-         else
-           {
-             q = -2;
-             r = a0 + 2*d;
-           }
-       }
-    }
-
-  *rp = r;
-  return q;
-}