test/mjsunit/math-floor.js

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// Flags: --max-new-space-size=256 --allow-natives-syntax

function testFloor(expect, input) {
  function test(n) {
    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() {
  testFloor(0, 0);
  testFloor(0, zero());
  testFloor(-0, -0);
  testFloor(Infinity, Infinity);
  testFloor(-Infinity, -Infinity);
  testFloor(NaN, NaN);

  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);

  // 2^30 is a smi boundary.
  var two_30 = 1 << 30;

  testFloor(two_30, two_30);
  testFloor(two_30, two_30 + 0.1);
  testFloor(two_30, two_30 + 0.5);
  testFloor(two_30, two_30 + 0.7);

  testFloor(two_30 - 1, two_30 - 1);
  testFloor(two_30 - 1, two_30 - 1 + 0.1);
  testFloor(two_30 - 1, two_30 - 1 + 0.5);
  testFloor(two_30 - 1, two_30 - 1 + 0.7);

  testFloor(-two_30, -two_30);
  testFloor(-two_30, -two_30 + 0.1);
  testFloor(-two_30, -two_30 + 0.5);
  testFloor(-two_30, -two_30 + 0.7);

  testFloor(-two_30 + 1, -two_30 + 1);
  testFloor(-two_30 + 1, -two_30 + 1 + 0.1);
  testFloor(-two_30 + 1, -two_30 + 1 + 0.5);
  testFloor(-two_30 + 1, -two_30 + 1 + 0.7);

  // 2^52 is a precision boundary.
  var two_52 = (1 << 30) * (1 << 22);

  testFloor(two_52, two_52);
  testFloor(two_52, two_52 + 0.1);
  assertEquals(two_52, two_52 + 0.5);
  testFloor(two_52, two_52 + 0.5);
  assertEquals(two_52 + 1, two_52 + 0.7);
  testFloor(two_52 + 1, two_52 + 0.7);

  testFloor(two_52 - 1, two_52 - 1);
  testFloor(two_52 - 1, two_52 - 1 + 0.1);
  testFloor(two_52 - 1, two_52 - 1 + 0.5);
  testFloor(two_52 - 1, two_52 - 1 + 0.7);

  testFloor(-two_52, -two_52);
  testFloor(-two_52, -two_52 + 0.1);
  testFloor(-two_52, -two_52 + 0.5);
  testFloor(-two_52, -two_52 + 0.7);

  testFloor(-two_52 + 1, -two_52 + 1);
  testFloor(-two_52 + 1, -two_52 + 1 + 0.1);
  testFloor(-two_52 + 1, -two_52 + 1 + 0.5);
  testFloor(-two_52 + 1, -two_52 + 1 + 0.7);
}


// Test in a loop to cover the custom IC and GC-related issues.
for (var i = 0; i < 500; i++) {
  test();
}