From bb30498399bae6268b8f52570a0ba902d8a88560 Mon Sep 17 00:00:00 2001
From: joaquintides <joaquin@tid.es>
Date: Thu, 27 Oct 2022 18:22:46 +0200
Subject: [PATCH] s/unchecked_countr_zero/__builtin_ctz

---
 include/boost/unordered/detail/foa.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/unordered/detail/foa.hpp b/include/boost/unordered/detail/foa.hpp
index 5f731494..ebd0db3c 100644
--- a/include/boost/unordered/detail/foa.hpp
+++ b/include/boost/unordered/detail/foa.hpp
@@ -1558,7 +1558,8 @@ private:
         auto p=arrays.elements+pos*N;
         prefetch_elements(p);
         do{
-          auto n=unchecked_countr_zero(mask);
+          //auto n=unchecked_countr_zero(mask);
+          auto n=__builtin_ctz((unsigned int)mask);
           if(BOOST_LIKELY(bool(pred()(x,key_from(p[n]))))){
             return {pg,n,p+n};
           }