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towupper/towlower: fast path for ascii chars

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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
This commit is contained in:
Natanael Copa 2017-05-30 14:23:24 +02:00 committed by Rich Felker
parent 1c497005ee
commit 179766aa2e
1 changed files with 3 additions and 3 deletions
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6
src/ctype/towctrans.c
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@ -1,3 +1,4 @@
#include <ctype.h>
#include <wctype.h> #include <wctype.h>
#include "libc.h" #include "libc.h"
@ -9,7 +10,6 @@ static const struct {
signed char lower; signed char lower;
unsigned char len; unsigned char len;
} casemaps[] = { } casemaps[] = {
CASEMAP('A','Z','a'),
CASEMAP(0xc0,0xde,0xe0), CASEMAP(0xc0,0xde,0xe0),
CASELACE(0x0100,0x012e), CASELACE(0x0100,0x012e),
@ -257,12 +257,12 @@ static wchar_t __towcase(wchar_t wc, int lower)
wint_t towupper(wint_t wc) 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) 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) wint_t __towupper_l(wint_t c, locale_t l)