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| 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 |
| 6 |
| 7 function boom(a1, a2) { |
| 8 // Do something with a2 that needs a map check (for DOUBLE_ELEMENTS). |
| 9 var s = a2[0]; |
| 10 // Emit a load that transitions a1 to FAST_ELEMENTS. |
| 11 var t = a1[0]; |
| 12 // Emit a store to a2 that assumes DOUBLE_ELEMENTS. |
| 13 // The map check is considered redundant and will be eliminated. |
| 14 a2[0] = 0.3; |
| 15 } |
| 16 |
| 17 // Prepare type feedback for the "t = a1[0]" load: fast elements. |
| 18 var fast_elem = new Array(1); |
| 19 fast_elem[0] = "tagged"; |
| 20 boom(fast_elem, [1]); |
| 21 |
| 22 // Prepare type feedback for the "a2[0] = 0.3" store: double elements. |
| 23 var double_elem = new Array(1); |
| 24 double_elem[0] = 0.1; |
| 25 boom(double_elem, double_elem); |
| 26 |
| 27 // Reset |double_elem| and go have a party. |
| 28 double_elem = new Array(10); |
| 29 double_elem[0] = 0.1; |
| 30 |
| 31 %OptimizeFunctionOnNextCall(boom); |
| 32 boom(double_elem, double_elem); |
| 33 |
| 34 assertEquals(0.3, double_elem[0]); |
| 35 assertEquals(undefined, double_elem[1]); |
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