test/mjsunit/regress/regress-1423.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax

// Test that the Lithium environment iterator does stop iteration early.
"use strict";

function f0() {
  return f1('literal', true);
}

function f1(x, y) {
  return f2(x, y);
}

// Because it's strict, f2 has an environment containing only the constants
// undefined, 'literal', and false.  Bug 1423 would cause environment
// iteration to stop early.
//
// Bug manifests as UNREACHABLE code (due to an unallocated register) in
// debug builds.
function f2(x, y) {
  if (y) {
    if (f3(x, 'other-literal')) {
      return 0;
    } else {
      return 1;
    }
  } else {
    return 2;
  }
}

function f3(x, y) {
  return x === y;
}

for (var i = 0; i < 5; ++i) f0();
%OptimizeFunctionOnNextCall(f0);
assertEquals(1, f0());