144186 2015-04-24 23:07:02 -0700 Rationalize DFG DCE handling of nodes that perform checks that propagate through AI 2015-04-27 11:49:42 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 fpizlo fpizlo oldest_to_newest 1088488 0 fpizlo 2015-04-24 23:07:02 -0700 If I do ArithAdd(Int32Use, Int32Use, CheckOverflow) then AI will prove that this returns Int32. We may later perform code simplifications based on the proof that this is Int32, and we may kill all DFG users of this ArithAdd. Then we may prove that there is no exit site at which the ArithAdd is live. This is sufficient to then kill the ArithAdd - except that we still need the overflow check! Currently we mishandle this: - In places where we want the overflow check we need to use MustGenerate(@ArithAdd) as a hack to keep it alive. That's dirty and it's just indicative of a deeper issue. - Our MovHint removal doesn't do Phantom canonicalization which essentially makes it powerless. This was sort of hiding the bug. - Nodes that have checks that AI leverages should always be NodeMustGenerate. You can't kill something that you are relying on for subsequent simplifications. 1088489 1 251613 fpizlo 2015-04-24 23:12:59 -0700 Created attachment 251613 the patch 1088492 2 fpizlo 2015-04-24 23:13:56 -0700 *** Bug 144148 has been marked as a duplicate of this bug. *** 1089078 3 251613 ggaren 2015-04-27 10:58:33 -0700 Comment on attachment 251613 the patch r=me 1089113 4 fpizlo 2015-04-27 11:49:42 -0700 Landed in http://trac.webkit.org/changeset/183401 251613 2015-04-24 23:12:59 -0700 2015-04-27 10:58:33 -0700 the patch blah.patch text/plain 25159 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTgzMzA3KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDg0IEBA CisyMDE1LTA0LTI0ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg 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