diff options
Diffstat (limited to 'deps/v8/test/mjsunit/regress/regress-2250.js')
-rw-r--r-- | deps/v8/test/mjsunit/regress/regress-2250.js | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/regress/regress-2250.js b/deps/v8/test/mjsunit/regress/regress-2250.js new file mode 100644 index 000000000..b3b0db3fc --- /dev/null +++ b/deps/v8/test/mjsunit/regress/regress-2250.js @@ -0,0 +1,68 @@ +// Copyright 2012 the V8 project authors. All rights reserved. +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following +// disclaimer in the documentation and/or other materials provided +// with the distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// Flags: --allow-natives-syntax + +// The original problem from the bug: In the example below SMI check for b +// generated for inlining of equals invocation (marked with (*)) will be hoisted +// out of the loop across the typeof b === "object" condition and cause an +// immediate deopt. Another problem here is that no matter how many time we +// deopt and reopt we will continue to produce the wrong code. +// +// The fix is to notice when a deopt and subsequent reopt doesn't find +// additional type information, indicating that optimistic LICM should be +// disabled during compilation. + +function eq(a, b) { + if (typeof b === "object") { + return b.equals(a); // (*) + } + return a === b; +} + +Object.prototype.equals = function (other) { + return (this === other); +}; + +function test() { + for (var i = 0; !eq(i, 10); i++) + ; +} + +eq({}, {}); +eq({}, {}); +eq(1, 1); +eq(1, 1); +test(); +%OptimizeFunctionOnNextCall(test); +test(); +%OptimizeFunctionOnNextCall(test); +// Second compilation should have noticed that LICM wasn't a good idea, and now +// function should no longer deopt when called. +test(); +assertTrue(2 != %GetOptimizationStatus(test)); + |