Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Flags: --allow-natives-syntax --noalways-opt |
| 6 | |
| 7 | // We disable vector store ICs because slot indices change when this option |
| 8 | // is enabled. |
| 9 | |
| 10 | // Locations in the type feedback vector where call counts are maintained for |
| 11 | // the two calls made from bar(); |
| 12 | |
| 13 | (function() { |
| 14 | const kFooCallExtraIndex = 5; |
| 15 | const kArrayCallExtraIndex = 7; |
| 16 | |
| 17 | function GetCallCount(func, slot) { |
| 18 | var vector = %GetTypeFeedbackVector(func); |
| 19 | // Call counts are recorded doubled. |
| 20 | var value = %FixedArrayGet(vector, slot); |
| 21 | return Math.floor(value / 2); |
| 22 | } |
| 23 | |
| 24 | function foo(a) { return a[3] * 16; } |
| 25 | |
| 26 | function bar(a) { |
| 27 | var result = 0; |
| 28 | for (var i = 0; i < 10; i++) { |
| 29 | result = foo(a); |
| 30 | if (i % 2 === 0) { |
| 31 | var r = Array(); |
| 32 | r[0] = 1; |
| 33 | result += r[0]; |
| 34 | } |
| 35 | } |
| 36 | return result; |
| 37 | } |
| 38 | |
| 39 | var a = [1, 2, 3]; |
| 40 | bar(a); |
| 41 | assertEquals(10, GetCallCount(bar, kFooCallExtraIndex)); |
| 42 | assertEquals(5, GetCallCount(bar, kArrayCallExtraIndex)); |
| 43 | |
| 44 | %OptimizeFunctionOnNextCall(bar); |
| 45 | bar(a); |
| 46 | })(); |