From: Natanael Copa <ncopa@alpinelinux.org>
Date: Tue, 30 May 2017 12:23:24 +0000 (+0200)
Subject: towupper/towlower: fast path for ascii chars
X-Git-Tag: v1.1.17~62
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=179766aa2ef06df854bc1d9616bf6f00ce49b7f9;p=oweals%2Fmusl.git

towupper/towlower: fast path for ascii chars

Make a fast path for ascii chars which is assumed to be the most common
case. This has significant performance benefit on xml json and similar
---

diff --git a/src/ctype/towctrans.c b/src/ctype/towctrans.c
index 6af61875..cf13a862 100644
--- a/src/ctype/towctrans.c
+++ b/src/ctype/towctrans.c
@@ -1,3 +1,4 @@
+#include <ctype.h>
 #include <wctype.h>
 #include "libc.h"
 
@@ -9,7 +10,6 @@ static const struct {
 	signed char lower;
 	unsigned char len;
 } casemaps[] = {
-	CASEMAP('A','Z','a'),
 	CASEMAP(0xc0,0xde,0xe0),
 
 	CASELACE(0x0100,0x012e),
@@ -257,12 +257,12 @@ static wchar_t __towcase(wchar_t wc, int lower)
 
 wint_t towupper(wint_t wc)
 {
-	return __towcase(wc, 0);
+	return (unsigned)wc < 128 ? toupper(wc) : __towcase(wc, 0);
 }
 
 wint_t towlower(wint_t wc)
 {
-	return __towcase(wc, 1);
+	return (unsigned)wc < 128 ? tolower(wc) : __towcase(wc, 1);
 }
 
 wint_t __towupper_l(wint_t c, locale_t l)