95953 2012-09-06 02:01:17 -0700 Regressions on 32-bit platforms with revisions 125637 and 126387 2012-09-06 12:53:53 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 yuqiang.xian webkit-unassigned barraclough fpizlo webkit.review.bot oldest_to_newest 713041 0 yuqiang.xian 2012-09-06 02:01:17 -0700 Take a look at awfy.com (http://arewefastyet.com/?runs=1000&view=regress&machine=11), there are two obvious performance regressions. The root cause is related to r125637, and it's further exposed in r126387. It's a typo in the baseline JIT compiler for op_get_by_val which causes the baseline JIT incorrectly falls back to the slow case. The value profiler knows the fact that the operation goes to the slow path, the DFG compiler then thinks it might clobber the world and the high level optimizations especially the local CSE are affected greatly. The fix should recover both regressions. My local test indicates 5% on SunSpider, 2% on v8 and 23% on Kraken. Patch forthcoming. 713050 1 162453 yuqiang.xian 2012-09-06 02:08:51 -0700 Created attachment 162453 patch 713054 2 162454 yuqiang.xian 2012-09-06 02:11:23 -0700 Created attachment 162454 Performance result (32bit) 713595 3 162453 webkit.review.bot 2012-09-06 12:53:50 -0700 Comment on attachment 162453 patch Clearing flags on attachment: 162453 Committed r127778: <http://trac.webkit.org/changeset/127778> 713596 4 webkit.review.bot 2012-09-06 12:53:53 -0700 All reviewed patches have been landed. Closing bug. 162453 2012-09-06 02:08:51 -0700 2012-09-06 12:53:50 -0700 patch 95953.patch text/plain 1529 yuqiang.xian SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTI3NzA5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDEzIEBA CisyMDEyLTA5LTA2ICBZdXFpYW5nIFhpYW4gIDx5dXFpYW5nLnhpYW5AaW50ZWwuY29tPgorCisg ICAgICAgIFBlcmZvcm1hbmNlIHJlZ3Jlc3Npb25zIG9uIDMyLWJpdCBwbGF0Zm9ybXMgd2l0aCBy ZXZpc2lvbnMgMTI1NjM3IGFuZCAxMjYzODcKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5v cmcvc2hvd19idWcuY2dpP2lkPTk1OTUzCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChP T1BTISkuCisKKyAgICAgICAgKiBqaXQvSklUUHJvcGVydHlBY2Nlc3MzMl82NC5jcHA6CisgICAg ICAgIChKU0M6OkpJVDo6ZW1pdF9vcF9nZXRfYnlfdmFsKTogRml4IHRoZSB0eXBvLgorCiAyMDEy LTA5LTA2ICBQYXRyaWNrIEdhbnN0ZXJlciAgPHBhcm9nYUB3ZWJraXQub3JnPgogCiAgICAgICAg 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