From 009ec37a47e2f2b5e7f928004fbc3403f0bd8abe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lourens=20Naud=C3=A9?= <lourens@bearmetal.eu>
Date: Sat, 13 Apr 2019 17:39:05 +0100
Subject: Let the index boundary check in rb_enc_from_index be flagged as
 unlikely

[Misc #15806]

Closes: https://github.com/ruby/ruby/pull/2128
---
 encoding.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'encoding.c')

diff --git a/encoding.c b/encoding.c
index 9655213f73..908a6458a0 100644
--- a/encoding.c
+++ b/encoding.c
@@ -608,7 +608,7 @@ rb_enc_init(void)
 rb_encoding *
 rb_enc_from_index(int index)
 {
-    if (index < 0 || enc_table.count <= (index &= ENC_INDEX_MASK)) {
+    if (UNLIKELY(index < 0 || enc_table.count <= (index &= ENC_INDEX_MASK))) {
 	return 0;
     }
     return enc_table.list[index].enc;
-- 
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