215894 2020-08-27 10:42:07 -0700 GetByVal constant folding over a Double OutOfBoundsSaneChain array with no BytecodeUsesAsOther should constant fold to PNaN, not undefined 2020-08-27 14:16:07 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 saam saam benjamin fpizlo ggaren gskachkov guijemont jsc32 keith_miller mark.lam msaboff rmorisset ross.kirsling ticaiolima tzagallo webkit-bug-importer ysuzuki zhunkibatu oldest_to_newest 1683427 0 saam 2020-08-27 10:42:07 -0700 ... 1683428 1 saam 2020-08-27 10:43:16 -0700 <rdar://problem/67669696> 1683429 2 407418 saam 2020-08-27 10:52:15 -0700 Created attachment 407418 patch 1683430 3 407418 msaboff 2020-08-27 10:54:33 -0700 Comment on attachment 407418 patch View in context: https://bugs.webkit.org/attachment.cgi?id=407418&action=review r=me > Source/JavaScriptCore/ChangeLog:10 > + BytecodeUsesAsOther return PNaN for holds and OOB accesses, not jsUndefined(). Did you mean *holes*? 1683431 4 407418 keith_miller 2020-08-27 10:56:55 -0700 Comment on attachment 407418 patch View in context: https://bugs.webkit.org/attachment.cgi?id=407418&action=review r=me. > Source/JavaScriptCore/ChangeLog:10 > + BytecodeUsesAsOther return PNaN for holds and OOB accesses, not jsUndefined(). typo: holds => holes. > Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h:2241 > + if (node->arrayMode().type() == Array::Double && node->arrayMode().isOutOfBoundsSaneChain() && !(node->flags() & NodeBytecodeUsesAsOther)) Seems like we could have an inline function for !(node->flags() & NodeBytecodeUsesAsOther) that's more meaningful than that expression... But we can do that another day. 1683436 5 407418 saam 2020-08-27 11:06:49 -0700 Comment on attachment 407418 patch View in context: https://bugs.webkit.org/attachment.cgi?id=407418&action=review >> Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h:2241 >> + if (node->arrayMode().type() == Array::Double && node->arrayMode().isOutOfBoundsSaneChain() && !(node->flags() & NodeBytecodeUsesAsOther)) > > Seems like we could have an inline function for !(node->flags() & NodeBytecodeUsesAsOther) that's more meaningful than that expression... But we can do that another day. Agreed, and also agree let's save it for another day. Probably want a name like: resultDistinguishesNaNFromUndefined 1683437 6 407419 saam 2020-08-27 11:09:53 -0700 Created attachment 407419 patch for landing 1683439 7 saam 2020-08-27 11:15:04 -0700 *** Bug 215841 has been marked as a duplicate of this bug. *** 1683484 8 ews-feeder 2020-08-27 14:16:06 -0700 Committed r266254: <https://trac.webkit.org/changeset/266254> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407419. 407418 2020-08-27 10:52:15 -0700 2020-08-27 11:09:53 -0700 patch b-backup.diff text/plain 3592 saam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyNjYyNDUpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDE0IEBACisyMDIwLTA4LTI3ICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUu Y29tPgorCisgICAgICAgIEdldEJ5VmFsIGNvbnN0YW50IGZvbGRpbmcgb3ZlciBhIERvdWJsZSBP dXRPZkJvdW5kc1NhbmVDaGFpbiBhcnJheSB3aXRoIG5vIEJ5dGVjb2RlVXNlc0FzT3RoZXIgc2hv dWxkIGNvbnN0YW50IGZvbGQgdG8gUE5hTiwgbm90IHVuZGVmaW5lZAorICAgICAgICBodHRwczov L2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjE1ODk0CisgICAgICAgIDxyZGFyOi8v cHJvYmxlbS82NzY2OTY5Nj4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4K KworICAgICAgICAqIHN0cmVzcy9vb2Itc2FuZS1jaGFpbi1kb3VibGUtY29uc3RhbnQtZm9sZC10 by1QTmFOLmpzOiBBZGRlZC4KKyAgICAgICAgKGZvbyk6CisKIDIwMjAtMDgtMjYgIEFsZXhleSBT 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