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584b18eb4d
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.
14 lines
311 B
C
14 lines
311 B
C
/* Multiple versions of strcasestr
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All versions must be listed in ifunc-impl-list.c. */
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#include "init-arch.h"
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#define STRCASESTR __strcasestr_sse2
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#include "string/strcasestr.c"
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extern __typeof (__strcasestr_sse2) __strcasestr_sse2 attribute_hidden;
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libc_ifunc (__strcasestr,
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__strcasestr_sse2);
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