svn commit: r1481413 - /subversion/trunk/subversion/libsvn_subr/cache-membuffer.c

[st...@apache.org]

Author: stefan2
Date: Sat May 11 21:04:30 2013
New Revision: 1481413

URL: http://svn.apache.org/r1481413
Log:
* subversion/libsvn_subr/cache-membuffer.c
  (combine_key): reorder the key permutation sequence to achieve a more
   even spread over the index space

Modified:
    subversion/trunk/subversion/libsvn_subr/cache-membuffer.c

Modified: subversion/trunk/subversion/libsvn_subr/cache-membuffer.c
URL: http://svn.apache.org/viewvc/subversion/trunk/subversion/libsvn_subr/cache-membuffer.c?rev=1481413&r1=1481412&r2=1481413&view=diff
==============================================================================
--- subversion/trunk/subversion/libsvn_subr/cache-membuffer.c (original)
+++ subversion/trunk/subversion/libsvn_subr/cache-membuffer.c Sat May 11 21:04:30 2013
@@ -2244,9 +2244,9 @@ combine_key(svn_membuffer_cache_t *cache
   /* scramble key DATA.  All of this must be reversible to prevent key
    * collisions.  So, we limit ourselves to xor and permutations. */
   data[1] = (data[1] << 27) | (data[1] >> 37);
+  data[0] = (data[0] << 43) | (data[0] >> 21);
   data[1] ^= data[0] & 0xffff;
   data[0] ^= data[1] & 0xffffffffffff0000ull;
-  data[0] = (data[0] << 43) | (data[0] >> 21);
 
   /* combine with this cache's namespace */
   cache->combined_key[0] = data[0] ^ cache->prefix[0];