2011-12-27 21:18:07 +00:00
commit 9f98ea7e22
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+// File: crn_hash.h
+// See Copyright Notice and license at the end of inc/crnlib.h
+#pragma once
+
+namespace crnlib
+{
+   uint32 fast_hash (const void* p, int len);
+   
+   // 4-byte integer hash, full avalanche
+   inline uint32 bitmix32c(uint32 a)
+   {
+      a = (a+0x7ed55d16) + (a<<12);
+      a = (a^0xc761c23c) ^ (a>>19);
+      a = (a+0x165667b1) + (a<<5);
+      a = (a+0xd3a2646c) ^ (a<<9);
+      a = (a+0xfd7046c5) + (a<<3);
+      a = (a^0xb55a4f09) ^ (a>>16);
+      return a;
+   }
+   
+   // 4-byte integer hash, full avalanche, no constants
+   inline uint32 bitmix32(uint32 a)
+   {
+      a -= (a<<6);
+      a ^= (a>>17);
+      a -= (a<<9);
+      a ^= (a<<4);
+      a -= (a<<3);
+      a ^= (a<<10);
+      a ^= (a>>15);
+      return a;
+   }
+      
+}  // namespace crnlib