From b9d29603375d17c3d1d609d9662f50beaec61fa1 Mon Sep 17 00:00:00 2001
From: glass <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 15 Jul 2013 04:38:50 +0000
Subject: * hash.c (rb_hash_each_pair): performance improvement by using  
 rb_block_arity().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41984 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 hash.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'hash.c')

diff --git a/hash.c b/hash.c
index 182a856a38..6cddb8cf0b 100644
--- a/hash.c
+++ b/hash.c
@@ -1472,6 +1472,13 @@ each_pair_i(VALUE key, VALUE value)
     return ST_CONTINUE;
 }
 
+static int
+each_pair_i_fast(VALUE key, VALUE value)
+{
+    rb_yield_values(2, key, value);
+    return ST_CONTINUE;
+}
+
 /*
  *  call-seq:
  *     hsh.each      {| key, value | block } -> hsh
@@ -1498,7 +1505,10 @@ static VALUE
 rb_hash_each_pair(VALUE hash)
 {
     RETURN_SIZED_ENUMERATOR(hash, 0, 0, hash_enum_size);
-    rb_hash_foreach(hash, each_pair_i, 0);
+    if (rb_block_arity() > 1)
+	rb_hash_foreach(hash, each_pair_i_fast, 0);
+    else
+	rb_hash_foreach(hash, each_pair_i, 0);
     return hash;
 }
 
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