From 27c11405a263ad43d24e2ed460e15f247ac06d17 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 17 May 2022 16:51:51 -0600
Subject: [PATCH] [ot-tag] Optimize subtag_matches

Part of https://github.com/harfbuzz/harfbuzz/issues/3591
---
 src/hb-ot-tag.cc | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/hb-ot-tag.cc b/src/hb-ot-tag.cc
index cca91869e..c5630fb31 100644
--- a/src/hb-ot-tag.cc
+++ b/src/hb-ot-tag.cc
@@ -189,18 +189,19 @@ hb_ot_tag_to_script (hb_tag_t tag)
 
 /* hb_language_t */
 
-static bool
+static inline bool
 subtag_matches (const char *lang_str,
 		const char *limit,
 		const char *subtag)
 {
+  unsigned subtag_len = strlen (subtag);
   do {
     const char *s = strstr (lang_str, subtag);
     if (!s || s >= limit)
       return false;
-    if (!ISALNUM (s[strlen (subtag)]))
+    if (!ISALNUM (s[subtag_len]))
       return true;
-    lang_str = s + strlen (subtag);
+    lang_str = s + subtag_len;
   } while (true);
 }