Revert reversion of 32 bit mulx multiplier

2023-01-30 20:03:01 +02:00
parent cafa1f2278
commit a74962bc3c
1 changed files with 3 additions and 1 deletions
--- a/include/boost/unordered/detail/mulx.hpp
+++ b/include/boost/unordered/detail/mulx.hpp
@ -107,11 +107,13 @@ inline std::size_t mulx( std::size_t x ) noexcept
 {
 #if defined(BOOST_UNORDERED_64B_ARCHITECTURE)

+    // multiplier is phi
    return (std::size_t)mulx64( (boost::uint64_t)x, 0x9E3779B97F4A7C15ull );

 #else /* 32 bits assumed */

-    return mulx32( x, 0x9E3779B9u );
+    // multiplier from https://arxiv.org/abs/2001.05304
+    return mulx32( x, 0xE817FB2Du );

 #endif
 }