From daec109f423e54094800e083fc8a8ca5cbceb866 Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@marc-andre.ca>
Date: Tue, 22 Dec 2020 21:29:00 -0500
Subject: [ruby/psych] Optimize cache with `compare_by_identity`

Using `compare_by_identity` gives a 4x performance boost on cache hits.
Benchmark in https://github.com/JuanitoFatas/fast-ruby/issues/189
---
 ext/psych/lib/psych/visitors/visitor.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'ext/psych/lib/psych/visitors/visitor.rb')

diff --git a/ext/psych/lib/psych/visitors/visitor.rb b/ext/psych/lib/psych/visitors/visitor.rb
index 35f8f81f18..e2585c0c77 100644
--- a/ext/psych/lib/psych/visitors/visitor.rb
+++ b/ext/psych/lib/psych/visitors/visitor.rb
@@ -12,7 +12,7 @@ module Psych
       def self.dispatch_cache
         Hash.new do |hash, klass|
           hash[klass] = :"visit_#{klass.name.gsub('::', '_')}"
-        end
+        end.compare_by_identity
       end
 
       if defined?(Ractor)
-- 
cgit v1.2.3