v8/test/mjsunit/compiler/dead-string-add-warm.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//
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// Flags: --allow-natives-syntax

function dead1(a, b) {
    var x = "a" + "b";
    return a; // x, "a", and "b" are dead code
}

function dead2(a, b) {
    var x = "0" + a;
    var y = "0" + b;
    return a; // x and y are both dead
}

function dead3(a, b) {
    a = a ? "1" : "0";
    b = b ? "1" : "0";
    var x = a + "0";
    var y = b + "0";
    return a; // x and y are both dead
}

function run() {
  assertEquals(33, dead1(33, 32));
  assertEquals(33, dead2(33, 32));
  assertEquals("1", dead3(33, 32));

  assertEquals(31, dead1(31, 30));
  assertEquals(31, dead2(31, 30));
  assertEquals("1", dead3(31, 32));

  assertEquals(0, dead1(0, 30));
  assertEquals(0, dead2(0, 30));
  assertEquals("0", dead3(0, 32));

  assertEquals(true, dead1(true, 0));
  assertEquals(true, dead2(true, 0));
  assertEquals("1", dead3(true, 0));

  assertEquals("true", dead1("true", 0));
  assertEquals("true", dead2("true", 0));
  assertEquals("1", dead3("true", 0));
}

%PrepareFunctionForOptimization(dead1);
run();
run();
%OptimizeFunctionOnNextCall(dead1);
run();
%PrepareFunctionForOptimization(dead2);
%OptimizeFunctionOnNextCall(dead2);
run();
%PrepareFunctionForOptimization(dead3);
%OptimizeFunctionOnNextCall(dead3);
run();