Andreas Kling 7bc40bd54a LibJS: Add a charAt builtin bytecode fast path ...

Tag String.prototype.charAt as a builtin and emit a dedicated
bytecode instruction for non-computed calls.

The asm interpreter can then stay on the fast path when the
receiver is a primitive string with resident UTF-16 data and the
selected code unit is ASCII. In that case we can return the VM's
cached empty or single-character ASCII string directly.

2026-04-12 19:15:50 +02:00

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