1 // Copyright 2008 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 const SMI_MAX = (1 << 30) - 1; 29 const SMI_MIN = -(1 << 30); 30 31 function testmulneg(a, b) { 32 var base = a * b; 33 assertEquals(-base, a * -b, "a * -b where a = " + a + ", b = " + b); 34 assertEquals(-base, -a * b, "-a * b where a = " + a + ", b = " + b); 35 assertEquals(base, -a * -b, "*-a * -b where a = " + a + ", b = " + b); 36 } 37 38 testmulneg(2, 3); 39 testmulneg(SMI_MAX, 3); 40 testmulneg(SMI_MIN, 3); 41 testmulneg(3.2, 2.3); 42 43 var x = { valueOf: function() { return 2; } }; 44 var y = { valueOf: function() { return 3; } }; 45 46 testmulneg(x, y); 47 48 // The test below depends on the correct evaluation order, which is not 49 // implemented by any of the known JS engines. 50 var z; 51 var v = { valueOf: function() { z+=2; return z; } }; 52 var w = { valueOf: function() { z+=3; return z; } }; 53 54 z = 0; 55 var base = v * w; 56 z = 0; 57 assertEquals(-base, -v * w); 58 z = 0; 59 assertEquals(base, -v * -w); 60
