switch to faster and better hash + random

1 files changed, 13 insertions, 5 deletions

diff --git a/include/hash.h b/include/hash.h
index cec51eac..09dabb59 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -30,9 +30,16 @@
 
 #include "types.h"
 
-#ifdef __x86_64__
+u32 hash32(const void *key, u32 len, u32 seed);
+u64 hash64(const void *key, u32 len, u64 seed);
 
-  #define ROL64(_x, _r) ((((u64)(_x)) << (_r)) | (((u64)(_x)) >> (64 - (_r))))
+#if 0
+
+The following code is disabled because xxh3 with a 32 bit resukt is 30% faster
+
+  #ifdef __x86_64__
+
+    #define ROL64(_x, _r) ((((u64)(_x)) << (_r)) | (((u64)(_x)) >> (64 - (_r))))
 
 static inline u32 hash32(const void *key, u32 len, u32 seed) {
 
@@ -65,9 +72,9 @@ static inline u32 hash32(const void *key, u32 len, u32 seed) {
 
 }
 
-#else
+  #else
 
-  #define ROL32(_x, _r) ((((u32)(_x)) << (_r)) | (((u32)(_x)) >> (32 - (_r))))
+    #define ROL32(_x, _r) ((((u32)(_x)) << (_r)) | (((u32)(_x)) >> (32 - (_r))))
 
 static inline u32 hash32(const void *key, u32 len, u32 seed) {
 
@@ -100,7 +107,8 @@ static inline u32 hash32(const void *key, u32 len, u32 seed) {
 
 }
 
-#endif                                                       /* ^__x86_64__ */
+  #endif                                                     /* ^__x86_64__ */
+#endif
 
 #endif                                                     /* !_HAVE_HASH_H */