From 07e3b30c8498672541200d22cf7b77d7a090a958 Mon Sep 17 00:00:00 2001
From: glass <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 4 Aug 2013 12:24:26 +0000
Subject: [PATCH] * array.c (rb_ary_zip): performance implement by using  
 ALLOCA_N() to allocate tmp buffer.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42374 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog |  5 +++++
 array.c   | 10 +++++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 2994d819d5..03c72445e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Aug  4 21:08:29 2013  Masaki Matsushita  <glass.saga@gmail.com>
+
+	* array.c (rb_ary_zip): performance implement by using
+	  ALLOCA_N() to allocate tmp buffer.
+
 Sun Aug  4 07:14:49 2013  Tanaka Akira  <akr@fsij.org>
 
 	* README.EXT, README.EXT.ja: Mention rb_integer_pack and
diff --git a/array.c b/array.c
index 56a5310c98..666ac817cb 100644
--- a/array.c
+++ b/array.c
@@ -3161,15 +3161,15 @@ rb_ary_zip(int argc, VALUE *argv, VALUE ary)
     else
 	result = rb_ary_new2(len);
 
-    if (block_given && arity > 1) {
-	VALUE tmp = rb_ary_new2(argc+1);
+    if (block_given && arity > 1 && argc+1 < 0x100) {
+	VALUE *tmp = ALLOCA_N(VALUE, argc+1);
 
 	for (i=0; i<RARRAY_LEN(ary); i++) {
-	    rb_ary_store(tmp, 0, RARRAY_AREF(ary, i));
+	    tmp[0] = RARRAY_AREF(ary, i);
 	    for (j=0; j<argc; j++) {
-		rb_ary_store(tmp, j+1, rb_ary_elt(argv[j], i));
+		tmp[j+1] = rb_ary_elt(argv[j], i);
 	    }
-	    rb_yield_values2(argc+1, RARRAY_RAWPTR(tmp));
+	    rb_yield_values2(argc+1, tmp);
 	}
     }
     else {