commit c4a927ca8dc383190d5df2cacd3f966698b6190c
author Bram Moolenaar <Bram@vim.org> Sun Jul 10 18:24:27 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Sun Jul 10 18:24:27 2016 +0200
tree 0a81c918cb5fa69ed8f90b8365db247353c442a7
parent b25f9a97e9aad3cbb4bc3fe87cdbd5700f8aa0c6

patch 7.4.2019
Problem:    When ignoring case utf_fold() may consume a lot of time.
Solution:   Optimize for ASCII.

src/mbyte.c

diff --git a/src/mbyte.c b/src/mbyte.c
index 4905700..7bc184b 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -3067,6 +3067,9 @@
     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));
 }
 

src/version.c

diff --git a/src/version.c b/src/version.c
index 7317edf..8013b45 100644
--- a/src/version.c
+++ b/src/version.c
@@ -759,6 +759,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2019,
+/**/
     2018,
 /**/
     2017,