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LibJS: Reduce UTF-8 to UTF-16 transcoding when only UTF-16 is wanted

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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
This commit is contained in:
Timothy Flynn 2021-08-09 18:00:38 -04:00 • committed by Andreas Kling
parent 66264f7c2a
commit b85b8ca350
2 changed files with 17 additions and 0 deletions
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2
Userland/Libraries/LibJS/Runtime/PrimitiveString.h
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@ -22,9 +22,11 @@ public:
PrimitiveString& operator=(PrimitiveString const&) = delete;
String const& string() const;
bool has_utf8_string() const { return m_has_utf8_string; }
Utf16String const& utf16_string() const;
Utf16View utf16_string_view() const;
bool has_utf16_string() const { return m_has_utf16_string; }
private:
virtual const char* class_name() const override { return "PrimitiveString"; }