glibc/sysdeps/x86_64/multiarch/strcasestr.c

/* Multiple versions of strcasestr
   All versions must be listed in ifunc-impl-list.c.  */

#include "init-arch.h"

#define STRCASESTR __strcasestr_sse2

#include "string/strcasestr.c"

extern __typeof (__strcasestr_sse2) __strcasestr_sse2 attribute_hidden;

libc_ifunc (__strcasestr,
	    __strcasestr_sse2);
Add strstr with unaligned loads. Fixes bug 12100. A sse42 version of strstr used pcmpistr instruction which is quite ineffective. A faster way is look for pairs of characters which is uses sse2, is faster than pcmpistr and for real strings a pairs we look for are relatively rare. For linear time complexity we use buy or rent technique which switches to two-way algorithm when superlinear behaviour is detected. 2013-12-14 18:33:56 +00:00			`/* Multiple versions of strcasestr`
			`All versions must be listed in ifunc-impl-list.c. */`
Speed up SSE4.2 strcasestr by avoiding indirect function call. 2010-07-16 22:37:38 +00:00
Add strstr with unaligned loads. Fixes bug 12100. A sse42 version of strstr used pcmpistr instruction which is quite ineffective. A faster way is look for pairs of characters which is uses sse2, is faster than pcmpistr and for real strings a pairs we look for are relatively rare. For linear time complexity we use buy or rent technique which switches to two-way algorithm when superlinear behaviour is detected. 2013-12-14 18:33:56 +00:00			`#include "init-arch.h"`

			`#define STRCASESTR __strcasestr_sse2`

			`#include "string/strcasestr.c"`

			`extern __typeof (__strcasestr_sse2) __strcasestr_sse2 attribute_hidden;`

			`libc_ifunc (__strcasestr,`
			`__strcasestr_sse2);`