v8/test/mjsunit/lithium/SeqStringSetChar.js

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// Flags: --allow-natives-syntax

function MyStringFromCharCode(code, i) {
  var one_byte = %NewString(3, true);
  %_OneByteSeqStringSetChar(0, code, one_byte);
  %_OneByteSeqStringSetChar(1, code, one_byte);
  %_OneByteSeqStringSetChar(i, code, one_byte);
  var two_byte = %NewString(3, false);
  %_TwoByteSeqStringSetChar(0, code, two_byte);
  %_TwoByteSeqStringSetChar(1, code, two_byte);
  %_TwoByteSeqStringSetChar(i, code, two_byte);
  return one_byte + two_byte;
}

MyStringFromCharCode(65, 2);
var r1 = MyStringFromCharCode(65, 2);
%OptimizeFunctionOnNextCall(MyStringFromCharCode);
var r2 = MyStringFromCharCode(65, 2);
assertEquals(r1, r2);