math-floor-global.js 5.37 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       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
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

28
// Flags: --max-semi-space-size=1 --allow-natives-syntax
29 30 31 32 33 34 35 36

// Test inlining of Math.floor when assigned to a global.
var flo = Math.floor;
var test_id = 0;

function testFloor(expect, input) {
  var test = new Function('n',
                          '"' + (test_id++) + '";return flo(n)');
37
  %PrepareFunctionForOptimization(test);
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
  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);

  // Ensure that a negative zero coming from Math.floor is properly handled
  // by other operations.
  function ifloor(x) {
    return 1 / Math.floor(x);
  }
63
  %PrepareFunctionForOptimization(ifloor);
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
  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);

  // 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.
145
for (var i = 0; i < 10; i++) {
146
  test();
147
  new Array(i * 10000);
148 149 150 151 152 153 154 155 156 157 158 159
}


// 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;
}
160
%PrepareFunctionForOptimization(floorsum);
161 162 163 164
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).
165
assertEquals(-0, floorsum(50000, -0));