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[utf8-validator] eliminate unnecessary comparison from must_be_2_3_continuation (#2113)

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* [utf8-validator] eliminate unnecessary comparison from must_be_2_3_continuation

* Fix comment in
This commit is contained in:
Niles Salter
2024-01-28 10:42:59 -07:00
committed by GitHub
parent ddecadde86
commit 9b0435d864
7 changed files with 22 additions and 26 deletions
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src/arm64.cpp
+4 -4
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@@ -108,10 +108,10 @@ simdjson_unused simdjson_inline simd8<bool> must_be_continuation(const simd8<uin
return is_second_byte ^ is_third_byte ^ is_fourth_byte;
}
simdjson_inline simd8<bool> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<bool> is_third_byte = prev2 >= uint8_t(0xe0u);
simd8<bool> is_fourth_byte = prev3 >= uint8_t(0xf0u);
return is_third_byte ^ is_fourth_byte;
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-0x80); // Only 111_____ will be >= 0x80
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-0x80); // Only 1111____ will be >= 0x80
return is_third_byte | is_fourth_byte;
}
} // unnamed namespace