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Better check for optimization in new x86-64 strstr/strcasestr.

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Ulrich Drepper 2009-07-20 21:18:28 -07:00
parent 2b7a8664fa
commit a8f895ebe1
2 changed files with 21 additions and 11 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2009-07-20 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/multiarch/strstr.c [USE_AS_STRCASESTR] (STRSTR_SSE42):
Use NONASCII_CASE information provided by the locale to determine
whether optimized string load function can be used. Minor cleanups.
2009-07-20 H.J. Lu <hongjiu.lu@intel.com>
* string/strcasestr.c (STRCASESTR): New macro.

26
sysdeps/x86_64/multiarch/strstr.c
View File

@ -26,8 +26,7 @@
#ifdef USE_AS_STRCASESTR
# include <ctype.h>
# include <locale.h>
# include <string.h>
# include <locale/localeinfo.h>
# define LOADBYTE(C) tolower (C)
# define CMPBYTE(C1, C2) \
@ -257,12 +256,20 @@ char *
__attribute__ ((section (".text.sse4.2")))
STRSTR_SSE42 (const unsigned char *s1, const unsigned char *s2)
{
int len, len1;
int len;
int len1;
const unsigned char *p1 = s1;
const unsigned char *p2 = s2;
__m128i frag1, frag2, zero;
int cmp, cmp_c, cmp_z, cmp_s;
int kmp_fwd, bmsk, bmsk1;
__m128i frag1;
__m128i frag2;
__m128i zero;
int cmp;
int cmp_c;
int cmp_z;
int cmp_s;
int kmp_fwd;
int bmsk;
int bmsk1;
const unsigned char *pt;
if (!p2[0])
@ -277,11 +284,8 @@ STRSTR_SSE42 (const unsigned char *s1, const unsigned char *s2)
#ifdef USE_AS_STRCASESTR
__m128i (*strloadu) (const unsigned char *);
const char *used_locale = setlocale (LC_CTYPE, NULL);
if (!used_locale
|| (used_locale[0] == 'C' && used_locale[1] == '\0')
|| strcmp (used_locale, "POSIX") == 0)
if (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_NONASCII_CASE) == 0)
strloadu = __m128i_strloadu_tolower_posix;
else
strloadu = __m128i_strloadu_tolower;
@ -430,7 +434,7 @@ re_trace:
action done done continue continue if s2 < s1
false match retrace s1 else false
*/
if(cmp_s & !cmp)
return (char *) pt;
else if (cmp_z)