80365 2012-03-05 19:21:46 -0800 PredictNone is incorrectly treated as isDoublePrediction 2012-03-05 23:04:26 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 yuqiang.xian webkit-unassigned barraclough fpizlo oldest_to_newest 571371 0 yuqiang.xian 2012-03-05 19:21:46 -0800 And also it is incorrectly treated as isFixedIndexedStorageObjectPrediction. 571374 1 130269 yuqiang.xian 2012-03-05 19:31:53 -0800 Created attachment 130269 the patch Attention: One performance regression on SunSpider-bitops-nsieve-bits. The root cause is identified - In ToT, a dead/unused variable was marked as ForcedDouble simply because it has PredictNone (as we don't propagate the type information for the dead/unused variables), and is treated as a Double prediction - so OSR performed successfully (that unused variable actually happened to be an integer, see line 108 in DFGOSREntry.cpp). But with this bug fix, the OSR is failed because there's no type prediction for the unused variable. Separated bug will be filed against this. 571420 2 yuqiang.xian 2012-03-05 20:25:49 -0800 (In reply to comment #1) > Attention: One performance regression on SunSpider-bitops-nsieve-bits. The root cause is identified - In ToT, a dead/unused variable was marked as ForcedDouble simply because it has PredictNone (as we don't propagate the type information for the dead/unused variables), and is treated as a Double prediction - so OSR performed successfully (that unused variable actually happened to be an integer, see line 108 in DFGOSREntry.cpp). But with this bug fix, the OSR is failed because there's no type prediction for the unused variable. Separated bug will be filed against this. bug 80371 is created for this specific issue. 571469 3 fpizlo 2012-03-05 22:13:45 -0800 Does the performance regression go away now? 571503 4 130296 yuqiang.xian 2012-03-05 22:39:19 -0800 Created attachment 130296 Performance result Yes, there's no performance regression with this change after bug 80371 is fixed. Please see the attached result. 571520 5 yuqiang.xian 2012-03-05 23:04:26 -0800 Landed as http://trac.webkit.org/changeset/109865 130269 2012-03-05 19:31:53 -0800 2012-03-05 22:40:10 -0800 the patch 80365.patch text/plain 1620 yuqiang.xian SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTA5ODM2KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE2IEBA CisyMDEyLTAzLTA1ICBZdXFpYW5nIFhpYW4gIDx5dXFpYW5nLnhpYW5AaW50ZWwuY29tPgorCisg ICAgICAgIFByZWRpY3ROb25lIGlzIGluY29ycmVjdGx5IHRyZWF0ZWQgYXMgaXNEb3VibGVQcmVk aWN0aW9uCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD04 MDM2NQorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEFs c28gaXQgaXMgaW5jb3JyZWN0bHkgdHJlYXRlZCBhcyBpc0ZpeGVkSW5kZXhlZFN0b3JhZ2VPYmpl 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