197015 2019-04-17 09:30:22 -0700 [JSC] Optimize cases of Array.prototype.join/toString on huge empty arrays which result into one-character repeats 2022-07-01 15:39:09 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 bandou.yacine webkit-unassigned bfulgham ews-watchlist fpizlo guijemont keith_miller loic.yhuel mark.lam msaboff olivier.blin saam ticaiolima webkit-bug-importer ysuzuki zan oldest_to_newest 1528113 0 bandou.yacine 2019-04-17 09:30:22 -0700 Add a fast case in Array.prototype.join when the array is empty and it uses array_storage indexingType and the separator length is less than 2. Use the same optimisation that is used in the case of UNDECIDED indexingType, in order allocate the final string in one step, instead of appending in a loop which consumes additional temporary memory. 1528129 1 367638 bandou.yacine 2019-04-17 10:00:23 -0700 Created attachment 367638 Patch 1528146 2 367645 bandou.yacine 2019-04-17 10:23:02 -0700 Created attachment 367645 Patch 1528410 3 olivier.blin 2019-04-18 00:20:26 -0700 For reference, this has been done to optimize the memory consumption of the "CPU Memory Allocation" YouTube test here: https://ytlr-cert.appspot.com/2019/main.html?test_type=functional-test 1528412 4 367645 ysuzuki 2019-04-18 00:49:58 -0700 Comment on attachment 367645 Patch Can you add tests?, like 1. simple test 2. array storage with some element 3. array storage + accessors 4. and so on 1535024 5 369554 bandou.yacine 2019-05-10 09:33:43 -0700 Created attachment 369554 Patch 1880212 6 webkit-bug-importer 2022-07-01 15:39:09 -0700 <rdar://problem/96318246> 367638 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