From 3aff6ba0e6076ca1a613c5b1d36698a578943de0 Mon Sep 17 00:00:00 2001
From: joaquintides <joaquin@tid.es>
Date: Thu, 27 Oct 2022 18:01:16 +0200
Subject: [PATCH] streamlined mixing into find (experiment)

---
 include/boost/unordered/detail/foa.hpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/boost/unordered/detail/foa.hpp b/include/boost/unordered/detail/foa.hpp
index 5f731494..7f657d6f 100644
--- a/include/boost/unordered/detail/foa.hpp
+++ b/include/boost/unordered/detail/foa.hpp
@@ -1384,8 +1384,18 @@ public:
   template<typename Key>
   BOOST_FORCEINLINE iterator find(const Key& x)
   {
-    auto hash=hash_for(x);
-    return find_impl(x,position_for(hash),hash);
+    //auto hash=hash_for(x);
+    auto hash=h()(x);
+
+    boost::uint64_t z=(boost::uint64_t)hash;
+
+    z^=z>>23;
+    z*=0xff51afd7ed558ccdull;
+    z^=z>>23;
+
+    //hash=(std::size_t)z;
+
+    return find_impl(x,position_for(z),z);
   }
 
   template<typename Key>