110536 2013-02-21 17:36:40 -0800 DFG ArgumentsSimplificationPhase should not have to rethread the graph 2013-02-22 00:29:16 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED INVALID P2 Normal --- 110535 1 fpizlo fpizlo barraclough ggaren mark.lam mhahnenberg msaboff oliver sam oldest_to_newest 839064 0 fpizlo 2013-02-21 17:36:40 -0800 This is an investigation of sorts. I may be wrong. But if true, then this should be a speed win. 839067 1 189647 fpizlo 2013-02-21 17:37:35 -0800 Created attachment 189647 the patch 839071 2 189647 fpizlo 2013-02-21 17:38:11 -0800 Comment on attachment 189647 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=189647&action=review > Source/JavaScriptCore/dfg/DFGVariableAccessData.h:280 > + > + Oops. I will back this out. 839081 3 189647 ggaren 2013-02-21 17:44:46 -0800 Comment on attachment 189647 the patch r=me 839325 4 fpizlo 2013-02-22 00:28:46 -0800 I've come to the conclusion that despite its weirdness, the current state of the arguments simplification phase is actually right. In fact: - PhantomArguments is always live, because it is always used to store into the arguments register. - The arguments alias register is always dead. So, everything is consistent as it is. I'm glad that I tried to "fix" the code; it gave me an appreciation for how awfully right the code was to begin with. 839327 5 fpizlo 2013-02-22 00:29:16 -0800 *** Bug 110533 has been marked as a duplicate of this bug. *** 189647 2013-02-21 17:37:35 -0800 2013-02-21 17:44:46 -0800 the patch blah.patch text/plain 7899 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTQzNjczKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDIzIEBA CisyMDEzLTAyLTIxICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg SXQncyBzdHJhbmdlIHRoYXQgc29tZXRpbWVzIHRoZSBERkcga2lsbHMgUGhhbnRvbUFyZ3VtZW50 cywgYnV0IGl0IGRvZXNuJ3QgYWx3YXlzIGRvIHNvCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJr aXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xMTA1MzMKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JP 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