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string.c (search_nonascii): add faster search using SSE2

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2024-01-23 08:55:53 +09:00
parent 4108b85c62
commit fb2ebcde7c
1 changed files with 39 additions and 0 deletions
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src/string.c
+39
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@@ -279,6 +279,45 @@ search_nonascii(const char* p, const char *e)
return e;
}
#elif defined(__SSE2__)
# include <emmintrin.h>
static inline const char *
search_nonascii(const char *p, const char *e)
{
if (16 < e - p) {
if (!_mm_movemask_epi8(_mm_loadu_si128((__m128i const*)p))) {
const intptr_t lowbits = sizeof(__m128i) - 1;
const __m128i *s, *t;
s = (const __m128i*)(~lowbits & ((intptr_t)p + lowbits));
t = (const __m128i*)(~lowbits & (intptr_t)e);
for (; s < t; ++s) {
if (_mm_movemask_epi8(_mm_load_si128(s)))
break;
}
p = (const char *)s;
}
}
switch (e - p) {
case 15: if (NOASCII(*p)) return p; ++p;
case 14: if (NOASCII(*p)) return p; ++p;
case 13: if (NOASCII(*p)) return p; ++p;
case 12: if (NOASCII(*p)) return p; ++p;
case 11: if (NOASCII(*p)) return p; ++p;
case 10: if (NOASCII(*p)) return p; ++p;
case 9: if (NOASCII(*p)) return p; ++p;
case 8: if (NOASCII(*p)) return p; ++p;
case 7: if (NOASCII(*p)) return p; ++p;
case 6: if (NOASCII(*p)) return p; ++p;
case 5: if (NOASCII(*p)) return p; ++p;
case 4: if (NOASCII(*p)) return p; ++p;
case 3: if (NOASCII(*p)) return p; ++p;
case 2: if (NOASCII(*p)) return p; ++p;
case 1: if (NOASCII(*p)) return p;
}
return e;
}
#else
#ifdef MRB_64BIT