From 9ce419a45c521d8c41773ad29cb9ccec3be05028 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 20 Mar 2010 04:27:32 +0000
Subject: * array.c (rb_ary_uniq_bang): the array is already unique if the  
 length is zero or one.   (rb_ary_uniq): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26987 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 array.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'array.c')

diff --git a/array.c b/array.c
index 138b3cfdb9..744d1e0491 100644
--- a/array.c
+++ b/array.c
@@ -3367,6 +3367,8 @@ rb_ary_uniq_bang(VALUE ary)
     long i, j;
 
     rb_ary_modify_check(ary);
+    if (RARRAY_LEN(ary) <= 1)
+        return Qnil;
     if (rb_block_given_p()) {
 	hash = ary_make_hash_by(ary);
 	if (RARRAY_LEN(ary) == (i = RHASH_SIZE(hash))) {
@@ -3412,6 +3414,8 @@ rb_ary_uniq(VALUE ary)
     VALUE hash, uniq, v;
     long i;
 
+    if (RARRAY_LEN(ary) <= 1)
+        return rb_ary_dup(ary);
     if (rb_block_given_p()) {
 	hash = ary_make_hash_by(ary);
 	uniq = ary_new(rb_obj_class(ary), RHASH_SIZE(hash));
-- 
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