RESOLVED FIXED 215894
GetByVal constant folding over a Double OutOfBoundsSaneChain array with no BytecodeUsesAsOther should constant fold to PNaN, not undefined 
https://bugs.webkit.org/show_bug.cgi?id=215894
Summary GetByVal constant folding over a Double OutOfBoundsSaneChain array with no By...
Saam Barati
Reported 2020-08-27 10:42:07 PDT
...
Attachments
patch (3.51 KB, patch)
2020-08-27 10:52 PDT, Saam Barati 		msaboff: review+
DetailsFormatted DiffDiff
patch for landing (3.53 KB, patch)
2020-08-27 11:09 PDT, Saam Barati 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Saam Barati
Comment 1 2020-08-27 10:43:16 PDT
<rdar://problem/67669696>
Saam Barati
Comment 2 2020-08-27 10:52:15 PDT
Created attachment 407418 [details] patch
Michael Saboff
Comment 3 2020-08-27 10:54:33 PDT
Comment on attachment 407418 [details] 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*?
Keith Miller
Comment 4 2020-08-27 10:56:55 PDT
Comment on attachment 407418 [details] 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.
Saam Barati
Comment 5 2020-08-27 11:06:49 PDT
Comment on attachment 407418 [details] 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
Saam Barati
Comment 6 2020-08-27 11:09:53 PDT
Created attachment 407419 [details] patch for landing
Saam Barati
Comment 7 2020-08-27 11:15:04 PDT
*** Bug 215841 has been marked as a duplicate of this bug. ***
EWS
Comment 8 2020-08-27 14:16:06 PDT
Committed r266254: <https://trac.webkit.org/changeset/266254> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407419 [details].
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