88284 2012-06-04 20:31:35 -0700 DFG CFG simplification should correct the variables at the head of the predecessor block 2012-06-04 23:41:15 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 fpizlo webkit-unassigned oldest_to_newest 641144 0 fpizlo 2012-06-04 20:31:35 -0700 Say that we have two blocks, B1 and B2. B1 doesn't do anything to variable X. B2 reads from variable X. Say that CFG simplification decides to merge B1 and B2. Currently, the new block, B1', will still say that the variable at head for X is Phi, which is wrong - it should be GetLocal, since that's the first thing that B1' does to X. This is asymptomatic except if we then do constant folding on X. I'm still trying to figure out a test case for this, but it's not looking so good. 641145 1 fpizlo 2012-06-04 20:34:43 -0700 OK found a reduced test case. Making a layout test. 641147 2 145685 fpizlo 2012-06-04 20:40:01 -0700 Created attachment 145685 the patch 641151 3 145685 ggaren 2012-06-04 20:44:33 -0700 Comment on attachment 145685 the patch r=me 641220 4 fpizlo 2012-06-04 23:41:15 -0700 Landed in http://trac.webkit.org/changeset/119464 145685 2012-06-04 20:40:01 -0700 2012-06-04 20:44:33 -0700 the patch fixcfg_patch_1.diff text/plain 8703 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTE5NDUzKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDEzIEBA CisyMDEyLTA2LTA0ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg REZHIENGRyBzaW1wbGlmaWNhdGlvbiBzaG91bGQgY29ycmVjdCB0aGUgdmFyaWFibGVzIGF0IHRo ZSBoZWFkIG9mIHRoZSBwcmVkZWNlc3NvciBibG9jaworICAgICAgICBodHRwczovL2J1Z3Mud2Vi 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