# HG changeset patch
# User stuefe
# Date 1589284416 -7200
#      Tue May 12 13:53:36 2020 +0200
# Node ID 7d0f70351057132a165a715e2e40d5b0ec9ea889
# Parent  0431aef0e0e1ab11b2883fee5d19a57869eb032c
8244777: ClassLoaderStats VM Op uses constant hash value

diff -r 0431aef0e0e1 -r 7d0f70351057 src/hotspot/share/classfile/classLoaderStats.hpp
--- a/src/hotspot/share/classfile/classLoaderStats.hpp	Tue May 12 07:16:54 2020 +0200
+++ b/src/hotspot/share/classfile/classLoaderStats.hpp	Tue May 12 13:53:36 2020 +0200
@@ -102,8 +102,15 @@
   }
 
   static unsigned oop_hash(oop const& s1) {
-    unsigned hash = (unsigned)((uintptr_t)&s1);
-    return hash ^ (hash >> LogMinObjAlignment);
+    uintptr_t tmp = cast_from_oop<uintptr_t>(s1);
+    unsigned hash = (unsigned)tmp;
+    hash = ~hash + (hash << 15);
+    hash = hash ^ (hash >> 12);
+    hash = hash + (hash << 2);
+    hash = hash ^ (hash >> 4);
+    hash = hash * 2057;
+    hash = hash ^ (hash >> 16);
+    return hash;
   }
 
   typedef ResourceHashtable<oop, ClassLoaderStats*,