[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.93 by root, Sat Nov 7 18:30:05 2009 UTC vs.
Revision 1.96 by root, Wed Nov 11 03:52:44 2009 UTC

   int32_t d = b - a;
   d &= d >> 31;
   return b - d;
 }
-// this is much faster than crossfires original algorithm
+// this is much faster than crossfire's original algorithm
 // on modern cpus
 inline int
 isqrt (int n)
 {
   return (int)sqrtf ((float)n);
 absdir (int d)
 {
   return ((d - 1) & 7) + 1;
 }
+// avoid ctz name because netbsd or freebsd spams it's namespace with it
+#if GCC_VERSION(3,4)
+static inline int least_significant_bit (uint32_t x)
+{
+  return __builtin_ctz (x);
+}
+#else
+int least_significant_bit (uint32_t x);
+#endif
+#define for_all_bits_sparse_32(mask, idxvar)      \
+  for (uint32_t idxvar, mask_ = mask;   \
+       mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
 extern ssize_t slice_alloc; // statistics
 void *salloc_ (int n)            throw (std::bad_alloc);
 void *salloc_ (int n, void *src) throw (std::bad_alloc);
 typedef refptr<object>    object_ptr;
 typedef refptr<archetype> arch_ptr;
 typedef refptr<client>    client_ptr;
 typedef refptr<player>    player_ptr;
+#define STRHSH_NULL 2166136261
+static inline uint32_t
+strhsh (const char *s)
+{
+  // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
+  // it is about twice as fast as the one-at-a-time one,
+  // with good distribution.
+  // FNV-1a is faster on many cpus because the multiplication
+  // runs concurrently with the looping logic.
+  uint32_t hash = STRHSH_NULL;
+  while (*s)
+    hash = (hash ^ *s++) * 16777619;
+  return hash;
+}
+static inline uint32_t
+memhsh (const char *s, size_t len)
+{
+  uint32_t hash = STRHSH_NULL;
+  while (len--)
+    hash = (hash ^ *s++) * 16777619;
+  return hash;
+}
 struct str_hash
 {
   std::size_t operator ()(const char *s) const
   {
-#if 0
-    uint32_t hash = 0;
-    /* use the one-at-a-time hash function, which supposedly is
-     * better than the djb2-like one used by perl5.005, but
-     * certainly is better then the bug used here before.
-     * see http://burtleburtle.net/bob/hash/doobs.html
-     */
-    while (*s)
-      {
-        hash += *s++;
-        hash += hash << 10;
-        hash ^= hash >>  6;
-      }
-    hash += hash <<  3;
-    hash ^= hash >> 11;
-    hash += hash << 15;
-#else
-    // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
-    // it is about twice as fast as the one-at-a-time one,
-    // with good distribution.
-    // FNV-1a is faster on many cpus because the multiplication
-    // runs concurrent with the looping logic.
-    uint32_t hash = 2166136261;
-    while (*s)
-      hash = (hash ^ *s++) * 16777619;
-#endif
-    return hash;
+    return strhsh (s);
+  }
+  std::size_t operator ()(const shstr &s) const
+  {
+    return strhsh (s);
   }
 };
 struct str_equal
 {

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Comparing deliantra/server/include/util.h (file contents): Revision 1.93 by root, Sat Nov 7 18:30:05 2009 UTC vs. Revision 1.96 by root, Wed Nov 11 03:52:44 2009 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.93 by root, Sat Nov 7 18:30:05 2009 UTC vs.
Revision 1.96 by root, Wed Nov 11 03:52:44 2009 UTC