134056 2014-06-18 22:00:51 -0700 [ftlopt] LICM should be able to hoist CheckStructure even if the loop clobbers structures so long as the structures being checked are watchable 2014-06-19 13:44:22 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED INVALID P2 Normal --- 133229 1 fpizlo fpizlo barraclough ggaren mark.lam mhahnenberg msaboff oliver sam oldest_to_newest 1016631 0 fpizlo 2014-06-18 22:00:51 -0700 Patch forthcoming. 1016632 1 233349 fpizlo 2014-06-18 22:24:10 -0700 Created attachment 233349 the patch 1016741 2 233349 fpizlo 2014-06-19 13:30:42 -0700 Comment on attachment 233349 the patch This is totally wrong. 1016749 3 fpizlo 2014-06-19 13:44:09 -0700 It's not right to hoist a CheckStructure just because the structure is watchable. Consider a loop like: var o = ...; // when assigned here, o does not have a field f. for (;;) { if (p1) o.f = 42; // adds a field f if (p2) // p2 becomes true only after p1 had become true ... = o.f; // say that after adding a field f to o, we won't add any more things to o, so the CheckStructure here will be on a watchable structure set. } If we hoist the CheckStructure then the CheckStructure will be sure to fail. Therefore, the rules on the hoistability of CheckStructures need to be substantially more subtle. In the example above, at a minimum we need to have some profiling of the type that o has at the loop pre-header to make sure that hoisting the CheckStructure to that location won't be guaranteed to fail. 233349 2014-06-18 22:24:10 -0700 2014-06-19 13:30:41 -0700 the patch blah.patch text/plain 10694 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTcwMTQxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE4IEBA CisyMDE0LTA2LTE4ICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xMzQwNTYK KworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICAqIGRmZy9E RkdBYnN0cmFjdEludGVycHJldGVySW5saW5lcy5oOgorICAgICAgICAoSlNDOjpERkc6OkFic3Ry YWN0SW50ZXJwcmV0ZXI8QWJzdHJhY3RTdGF0ZVR5cGU+OjpleGVjdXRlRWZmZWN0cyk6CisgICAg 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