150457 2015-10-22 11:13:41 -0700 Air should allocate registers 2016-10-16 14:41:19 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All RESOLVED FIXED P2 Normal --- 150456 1 fpizlo benjamin benjamin mark.lam oldest_to_newest 1135745 0 fpizlo 2015-10-22 11:13:41 -0700 Instead of spilling everything. 1141024 1 265257 benjamin 2015-11-10 18:33:13 -0800 Created attachment 265257 Patch 1141027 2 265257 fpizlo 2015-11-10 18:45:58 -0800 Comment on attachment 265257 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=265257&action=review > Source/JavaScriptCore/b3/air/AirInstInlines.h:63 > - arg = Arg::stack(stackSlot); > + arg = Arg::stack(stackSlot, arg.offset()); Oops. > Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:51 > + bool isMove = inst.opcode == Move || inst.opcode == Move32; We shouldn't coalesce Move32's, since they zero-extend. 1141057 3 benjamin 2015-11-10 21:10:39 -0800 Committed r192292: <http://trac.webkit.org/changeset/192292> 1240787 4 265257 fpizlo 2016-10-16 13:48:22 -0700 Comment on attachment 265257 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=265257&action=review > Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:323 > + if (!degree) > + continue; Oh man! This finally turned into a bug, I think! A spill tmp from the previous iteration may have no degree: imagine a tmp that is live everywhere and interferes with everyone, but has one use like: Move %ourTmp, %someOtherTmp Where there are no other tmps live. After spill conversion, this may look like: Move (ourSpill), %newTmp Move %newTmp, %someOtherTmp Of course, we'd rather not get this kind of spill code but it's totally possible because we now have a bunch of random conditions under which we won't slap the spill address directly into the Move. After this happens, assuming that the only thing live was %someOtherTmp, we will have zero degree for %newTmp because the Move is coalescable and does not contribute to interference. Then, we might coalesce %someOtherTmp with %newTmp. Once this happens, if we make the %newTmp be the master, we're in deep trouble because %newTmp is not on any worklist due to these two lines of code! Do you agree that these two lines can be removed? 1240791 5 fpizlo 2016-10-16 14:41:19 -0700 (In reply to comment #4) > Comment on attachment 265257 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=265257&action=review > > > Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:323 > > + if (!degree) > > + continue; > > Oh man! This finally turned into a bug, I think! A spill tmp from the > previous iteration may have no degree: imagine a tmp that is live everywhere > and interferes with everyone, but has one use like: > > Move %ourTmp, %someOtherTmp > > Where there are no other tmps live. After spill conversion, this may look > like: > > Move (ourSpill), %newTmp > Move %newTmp, %someOtherTmp > > Of course, we'd rather not get this kind of spill code but it's totally > possible because we now have a bunch of random conditions under which we > won't slap the spill address directly into the Move. > > After this happens, assuming that the only thing live was %someOtherTmp, we > will have zero degree for %newTmp because the Move is coalescable and does > not contribute to interference. > > Then, we might coalesce %someOtherTmp with %newTmp. Once this happens, if > we make the %newTmp be the master, we're in deep trouble because %newTmp is > not on any worklist due to these two lines of code! > > Do you agree that these two lines can be removed? https://bugs.webkit.org/show_bug.cgi?id=163509 265257 2015-11-10 18:33:13 -0800 2015-11-10 18:45:58 -0800 Patch bug-150457-20151110183309.patch text/plain 50251 benjamin U3VidmVyc2lvbiBSZXZpc2lvbjogMTkyMjcwCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBi ZWVjMTBlNDIwZTg2MDIzMmE1NDI0ZTg0YTg3NWIxZjg0M2U2MDE3Li4zNTMzNDZhNmI2MTkwNDlh NTcwZDgzMGFmYTAxMzE0ODNhYWJjNWU1IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSw3NSBAQAorMjAxNS0xMS0xMCAgQmVuamFtaW4gUG91bGFpbiAgPGJwb3VsYWluQGFwcGxl LmNvbT4KKworICAgICAgICBBaXIgc2hvdWxkIGFsbG9jYXRlIHJlZ2lzdGVycworICAgICAgICBo dHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTUwNDU3CisKKyAgICAgICAg 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