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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // Flags: --allow-natives-syntax --no-fold-constants
     29 
     30 function add(x, y) {
     31   return x + y;
     32 }
     33 
     34 assertEquals(0, add(0, 0));
     35 assertEquals(0, add(0, 0));
     36 %OptimizeFunctionOnNextCall(add);
     37 assertEquals(-0, add(-0, -0));
     38 
     39 
     40 function test(x, y) {
     41   assertTrue(%_IsMinusZero(-0));
     42   assertTrue(%_IsMinusZero(1/(-Infinity)));
     43   assertTrue(%_IsMinusZero(x));
     44 
     45   assertFalse(%_IsMinusZero(0));
     46   assertFalse(%_IsMinusZero(1/Infinity));
     47   assertFalse(%_IsMinusZero(0.1));
     48   assertFalse(%_IsMinusZero(-0.2));
     49   assertFalse(%_IsMinusZero({}));
     50   assertFalse(%_IsMinusZero(""));
     51   assertFalse(%_IsMinusZero("-0"));
     52   assertFalse(%_IsMinusZero(function() {}));
     53   assertFalse(%_IsMinusZero(y));
     54 }
     55 
     56 test(-0, 1.2);
     57 test(-0, 1.2);
     58 %OptimizeFunctionOnNextCall(test);
     59 test(-0, 1.2);
     60 assertOptimized(test);
     61 
     62 
     63 function testsin() {
     64   assertTrue(%_IsMinusZero(Math.sin(-0)));
     65 }
     66 
     67 testsin();
     68 testsin();
     69 %OptimizeFunctionOnNextCall(testsin);
     70 testsin();
     71 
     72 
     73 function testfloor() {
     74   assertTrue(%_IsMinusZero(Math.floor(-0)));
     75   assertFalse(%_IsMinusZero(Math.floor(2)));
     76 }
     77 
     78 testfloor();
     79 testfloor();
     80 %OptimizeFunctionOnNextCall(testfloor);
     81 testfloor();
     82 
     83 
     84 var double_one = Math.cos(0);
     85 
     86 function add(a, b) {
     87   return a + b;
     88 }
     89 
     90 assertEquals(1, 1/add(double_one, 0));
     91 assertEquals(1, 1/add(0, double_one));
     92 %OptimizeFunctionOnNextCall(add);
     93 assertEquals(1/(-0 + -0), 1/add(-0, -0));
     94