v8/test/mjsunit/math-floor-part4.js

// Copyright 2011 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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// Flags: --max-new-space-size=2 --allow-natives-syntax

var test_id = 0;

function testFloor(expect, input) {
  var test = new Function('n',
                          '"' + (test_id++) + '";return Math.floor(n)');
  assertEquals(expect, test(input));
  assertEquals(expect, test(input));
  assertEquals(expect, test(input));
  %OptimizeFunctionOnNextCall(test);
  assertEquals(expect, test(input));

  var test_double_output = new Function(
      'n',
      '"' + (test_id++) + '";return Math.floor(n) + -0.0');
  assertEquals(expect, test_double_output(input));
  assertEquals(expect, test_double_output(input));
  assertEquals(expect, test_double_output(input));
  %OptimizeFunctionOnNextCall(test_double_output);
  assertEquals(expect, test_double_output(input));
}

function zero() {
  var x = 0.5;
  return (function() { return x - 0.5; })();
}

function test() {
  testFloor(0, 0);
  testFloor(0, zero());
  testFloor(-0, -0);
  testFloor(Infinity, Infinity);
  testFloor(-Infinity, -Infinity);
  testFloor(NaN, NaN);
}


// Test in a loop to cover the custom IC and GC-related issues.
for (var i = 0; i < 100; i++) {
  test();
}


// Regression test for a bug where a negative zero coming from Math.floor
// was not properly handled by other operations.
function floorsum(i, n) {
  var ret = Math.floor(n);
  while (--i > 0) {
    ret += Math.floor(n);
  }
  return ret;
}
assertEquals(-0, floorsum(1, -0));
%OptimizeFunctionOnNextCall(floorsum);
// The optimized function will deopt.  Run it with enough iterations to try
// to optimize via OSR (triggering the bug).
assertEquals(-0, floorsum(100000, -0));