From c4a927ca8dc383190d5df2cacd3f966698b6190c Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 10 Jul 2016 18:24:27 +0200
Subject: patch 7.4.2019 Problem:    When ignoring case utf_fold() may consume
 a lot of time. Solution:   Optimize for ASCII.

---
 src/mbyte.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/mbyte.c')

diff --git a/src/mbyte.c b/src/mbyte.c
index 49057000f..7bc184ba2 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -3067,6 +3067,9 @@ utf_convert(
     int
 utf_fold(int a)
 {
+    if (a < 0x80)
+	/* be fast for ASCII */
+	return a >= 0x41 && a <= 0x5a ? a + 32 : a;
     return utf_convert(a, foldCase, (int)sizeof(foldCase));
 }
 
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