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LibJS: Reduce UTF-8 to UTF-16 transcoding when only UTF-16 is wanted
When appending two strings together to form a new string, if both of the strings are already UTF-16, create the new string as UTF-16 as well. This shaves about 0.5 seconds off the following test262 test: RegExp/property-escapes/generated/General_Category_-_Decimal_Number.js
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@ -22,9 +22,11 @@ public:
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PrimitiveString& operator=(PrimitiveString const&) = delete;
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String const& string() const;
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bool has_utf8_string() const { return m_has_utf8_string; }
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Utf16String const& utf16_string() const;
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Utf16View utf16_string_view() const;
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bool has_utf16_string() const { return m_has_utf16_string; }
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private:
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virtual const char* class_name() const override { return "PrimitiveString"; }
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