From 7717ff01a11a8fdd985cdd322c7c5608c003f50d Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Tue, 18 Jan 2022 20:40:23 +0200
Subject: [PATCH] Use bit_ceil and bit_floor in mix64_policy

---
 .../boost/unordered/detail/implementation.hpp  | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/include/boost/unordered/detail/implementation.hpp b/include/boost/unordered/detail/implementation.hpp
index fc83e739..a7bb863c 100644
--- a/include/boost/unordered/detail/implementation.hpp
+++ b/include/boost/unordered/detail/implementation.hpp
@@ -16,6 +16,7 @@
 #include <boost/core/allocator_traits.hpp>
 #include <boost/core/no_exceptions_support.hpp>
 #include <boost/core/pointer_traits.hpp>
+#include <boost/core/bit.hpp>
 #include <boost/detail/select_type.hpp>
 #include <boost/limits.hpp>
 #include <boost/move/move.hpp>
@@ -2024,25 +2025,12 @@ namespace boost {
         {
           if (min <= 4)
             return 4;
-          --min;
-          min |= min >> 1;
-          min |= min >> 2;
-          min |= min >> 4;
-          min |= min >> 8;
-          min |= min >> 16;
-          min |= min >> 32;
-          return min + 1;
+          return boost::core::bit_ceil(min);
         }
 
         static inline SizeT prev_bucket_count(SizeT max)
         {
-          max |= max >> 1;
-          max |= max >> 2;
-          max |= max >> 4;
-          max |= max >> 8;
-          max |= max >> 16;
-          max |= max >> 32;
-          return (max >> 1) + 1;
+          return boost::core::bit_floor(max);
         }
       };