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| 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 // Flags: --gc-greedy --noverify-heap | |
| 29 | |
| 30 function IterativeFib(n) { | |
| 31 var f0 = 0, f1 = 1; | |
| 32 for (; n > 0; --n) { | |
| 33 var f2 = f0 + f1; | |
| 34 f0 = f1; f1 = f2; | |
| 35 } | |
| 36 return f0; | |
| 37 } | |
| 38 | |
| 39 function RecursiveFib(n) { | |
| 40 if (n <= 1) return n; | |
| 41 return RecursiveFib(n - 1) + RecursiveFib(n - 2); | |
| 42 } | |
| 43 | |
| 44 function Check(n, expected) { | |
| 45 var i = IterativeFib(n); | |
| 46 var r = RecursiveFib(n); | |
| 47 assertEquals(i, expected); | |
| 48 assertEquals(r, expected); | |
| 49 } | |
| 50 | |
| 51 Check(0, 0); | |
| 52 Check(1, 1); | |
| 53 Check(2, 1); | |
| 54 Check(3, 1 + 1); | |
| 55 Check(4, 2 + 1); | |
| 56 Check(5, 3 + 2); | |
| 57 Check(10, 55); | |
| 58 Check(15, 610); | |
| 59 Check(20, 6765); | |
| 60 assertEquals(IterativeFib(75), 2111485077978050); | |
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