OpenXM_contrib/gmp/mpn/generic/hamdist.c - diff

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Diff for /OpenXM_contrib/gmp/mpn/generic/Attic/hamdist.c between version 1.1.1.1 and 1.1.1.3

-version 1.1.1.1, 2000/01/10 15:35:23
+version 1.1.1.3, 2003/08/25 16:06:20
 Line 1
 Line 1
 Line 1
- /* mpn_hamdist --
+ /* mpn_hamdist -- mpn hamming distance.
- Copyright (C) 1994, 1996 Free Software Foundation, Inc.
+ Copyright 1994, 1996, 2000, 2001 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 Library General Public License as published by
+ it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2 of the License, or (at your
+ 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 Library General Public
+ 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 Library General Public License
+ 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. */
 Line 22  MA 02111-1307, USA. */
 Line 22  MA 02111-1307, USA. */
 Line 22  MA 02111-1307, USA. */
  #include "gmp.h"
  #include "gmp-impl.h"
- #if defined __GNUC__
- #if defined __sparc_v9__ && BITS_PER_MP_LIMB == 64
- #define popc_limb(a) \
-   ({                                                                    \
-     DItype __res;                                                       \
-     asm ("popc %1,%0" : "=r" (__res) : "rI" (a));                       \
-     __res;                                                              \
-   })
- #endif
- #endif
- #ifndef popc_limb
+ unsigned long
- /* Cool population count of a mp_limb_t.
-    You have to figure out how this works, I won't tell you!  */
- static inline unsigned int
- popc_limb (x)
-      mp_limb_t x;
- {
- #if BITS_PER_MP_LIMB == 64
-   /* We have to go into some trouble to define these constants.
-      (For mp_limb_t being `long long'.)  */
-   mp_limb_t cnst;
-   cnst = 0x55555555L | ((mp_limb_t) 0x55555555L << BITS_PER_MP_LIMB/2);
-   x = ((x & ~cnst) >> 1) + (x & cnst);
-   cnst = 0x33333333L | ((mp_limb_t) 0x33333333L << BITS_PER_MP_LIMB/2);
-   x = ((x & ~cnst) >> 2) + (x & cnst);
-   cnst = 0x0f0f0f0fL | ((mp_limb_t) 0x0f0f0f0fL << BITS_PER_MP_LIMB/2);
-   x = ((x >> 4) + x) & cnst;
-   x = ((x >> 8) + x);
-   x = ((x >> 16) + x);
-   x = ((x >> 32) + x) & 0xff;
- #endif
- #if BITS_PER_MP_LIMB == 32
-   x = ((x >> 1) & 0x55555555L) + (x & 0x55555555L);
-   x = ((x >> 2) & 0x33333333L) + (x & 0x33333333L);
-   x = ((x >> 4) + x) & 0x0f0f0f0fL;
-   x = ((x >> 8) + x);
-   x = ((x >> 16) + x) & 0xff;
- #endif
-   return x;
- }
- #endif
- unsigned long int
- #if __STDC__
  mpn_hamdist (mp_srcptr up, mp_srcptr vp, mp_size_t size)
- #else
- mpn_hamdist (up, vp, size)
-      register mp_srcptr up;
-      register mp_srcptr vp;
-      register mp_size_t size;
- #endif
  {
-   unsigned long int hamdist;
+   unsigned long  result = 0;
-   mp_size_t i;
+   unsigned long  n;
-   hamdist = 0;
+   ASSERT (size >= 1);
-   for (i = 0; i < size; i++)
-     hamdist += popc_limb (up[i] ^ vp[i]);
-   return hamdist;
+   do {
+     popc_limb (n, *up++ ^ *vp++);
+     result += n;
+   } while (--size != 0);
+   return result;
  }

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