v8/test/mjsunit/math-floor-part1.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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//     * Redistributions in binary form must reproduce the above
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// Flags: --max-new-space-size=256 --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));
}

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

function test() {
  // Ensure that a negative zero coming from Math.floor is properly handled
  // by other operations.
  function ifloor(x) {
    return 1 / Math.floor(x);
  }
  assertEquals(-Infinity, ifloor(-0));
  assertEquals(-Infinity, ifloor(-0));
  assertEquals(-Infinity, ifloor(-0));
  %OptimizeFunctionOnNextCall(ifloor);
  assertEquals(-Infinity, ifloor(-0));

  testFloor(0, 0.1);
  testFloor(0, 0.49999999999999994);
  testFloor(0, 0.5);
  testFloor(0, 0.7);
  testFloor(-1, -0.1);
  testFloor(-1, -0.49999999999999994);
  testFloor(-1, -0.5);
  testFloor(-1, -0.7);
  testFloor(1, 1);
  testFloor(1, 1.1);
  testFloor(1, 1.5);
  testFloor(1, 1.7);
  testFloor(-1, -1);
  testFloor(-2, -1.1);
  testFloor(-2, -1.5);
  testFloor(-2, -1.7);

  testFloor(0, Number.MIN_VALUE);
  testFloor(-1, -Number.MIN_VALUE);
  testFloor(Number.MAX_VALUE, Number.MAX_VALUE);
  testFloor(-Number.MAX_VALUE, -Number.MAX_VALUE);
  testFloor(Infinity, Infinity);
  testFloor(-Infinity, -Infinity);
}


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