Reorganisation of the source tree

[ghc-hetmet.git] / ghc / rts / gmp / mpn / generic / diveby3.c

diff --git a/ghc/rts/gmp/mpn/generic/diveby3.c b/ghc/rts/gmp/mpn/generic/diveby3.c
deleted file mode 100644 (file)
index a2fb552..0000000
--- a/ghc/rts/gmp/mpn/generic/diveby3.c
+++ /dev/null
@@ -1,77 +0,0 @@
-/* mpn_divexact_by3 -- mpn division by 3, expecting no remainder. */
-
-/*
-Copyright (C) 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"
-
-
-/* Multiplicative inverse of 3, modulo 2^BITS_PER_MP_LIMB.
-   0xAAAAAAAB for 32 bits, 0xAAAAAAAAAAAAAAAB for 64 bits. */
-#define INVERSE_3      ((MP_LIMB_T_MAX / 3) * 2 + 1)
-
-
-/* The "c += ..."s are adding the high limb of 3*l to c.  That high limb
-   will be 0, 1 or 2.  Doing two separate "+="s seems to turn out better
-   code on gcc (as of 2.95.2 at least).
-
-   When a subtraction of a 0,1,2 carry value causes a borrow, that leaves a
-   limb value of either 0xFF...FF or 0xFF...FE and the multiply by INVERSE_3
-   gives 0x55...55 or 0xAA...AA respectively, producing a further borrow of
-   only 0 or 1 respectively.  Hence the carry out of each stage and for the
-   return value is always only 0, 1 or 2.  */
-
-mp_limb_t
-#if __STDC__
-mpn_divexact_by3c (mp_ptr dst, mp_srcptr src, mp_size_t size, mp_limb_t c)
-#else
-mpn_divexact_by3c (dst, src, size, c)
-     mp_ptr    dst;
-     mp_srcptr src;
-     mp_size_t size;
-     mp_limb_t c;
-#endif
-{
-  mp_size_t  i;
-
-  ASSERT (size >= 1);
-
-  i = 0;
-  do
-    {
-      mp_limb_t  l, s;
-
-      s = src[i];
-      l = s - c;
-      c = (l > s);
-
-      l *= INVERSE_3;
-      dst[i] = l;
-
-      c += (l > MP_LIMB_T_MAX/3);
-      c += (l > (MP_LIMB_T_MAX/3)*2);
-    }
-  while (++i < size);
-
-  return c;
-}