125740 2013-12-14 12:15:12 -0800 Create a DFG SSA backend with global register allocation 2015-08-26 22:48:54 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All NEW P2 Normal --- 1 fpizlo fpizlo barraclough benjamin fpizlo ggaren mark.lam mhahnenberg msaboff nrotem oliver sam oldest_to_newest 959856 0 fpizlo 2013-12-14 12:15:12 -0800 A lot of the speed-up from the FTL is from optimizations implemented on the DFG side. Maybe we should just lower to machine code directly from DFG IR, but just incrementally improve how we do it. 959857 1 fpizlo 2013-12-14 12:25:30 -0800 This is going to be kind of dirty at first, but I think it'll work. Here's what we need: 1) Compute an estimate of the data format and scratch register count for each node. These really are estimates, for the most part, and we have a lot of room for slop here. More on that below. 2) Compute the liveness that includes OSR availability. This is kind of fun because it combines two backwards analyses (DFG liveness and BC liveness), one forward analysis (OSR availability), and some CFA results (canExit). I'll refer to this as liveness-including-availability, or LIA. 3) Compute interference and use that to do coloring for both spill slots and registers, globally. Use a quick-and-dirty coloring algorithm for spills and a smart algorithm for registers. 4) Institute a policy that at the top of each basic block, all live nodes (according to LIA) should be in the register and stored according to the format/register/spill that those nodes report. 5) Code generation proceeds independently for each basic block and runs forward, as now. If the code generator wants more scratch registers, it may spill nodes. It may also decide to change the representation of a node. But it is required to return all nodes to their original formats at the end of the basic block. (5) is the reason why (1) can be sloppy. For example we may compute that a node is formatted as DataFormatJS and uses 1 scratch register, but then that node may actually return a DataFormatInt32 and use 2 scratch registers. Worst case, this causes one local spill (that gets restored by the end of the block) and causes the code generator to have to reformat the node at the end of the block. 959861 2 219257 fpizlo 2013-12-14 13:44:58 -0800 Created attachment 219257 work in progress 959863 3 219258 fpizlo 2013-12-14 15:08:43 -0800 Created attachment 219258 moar 959917 4 219274 fpizlo 2013-12-14 23:19:39 -0800 Created attachment 219274 implemented the RA I wrote Chaitin's algorithm. It was enjoyable. 959947 5 219258 oliver 2013-12-15 13:45:39 -0800 Comment on attachment 219258 moar View in context: https://bugs.webkit.org/attachment.cgi?id=219258&action=review > Source/JavaScriptCore/dfg/DFGLocationAllocationPhase.cpp:199 > + HashMap<Node*, HashSet<Node*>> m_interference; unused? > Source/JavaScriptCore/dfg/DFGNode.h:1563 > + ASSERT(static_cast<unsigned>(m_scratches) == num); this cast shouldn't be necessary as both types are unsigned. If your goal is to avoid undefined behaviour shenanigans your best approach would be to do ASSERT(!(num & ~0xff)), but none of tat should matter as asserts are only on in debug builds so no edge case optimisation should occur. 959948 6 oliver 2013-12-15 13:46:13 -0800 (In reply to comment #4) > Created an attachment (id=219274) [details] > implemented the RA > > I wrote Chaitin's algorithm. It was enjoyable. wrong patch? 959949 7 fpizlo 2013-12-15 14:13:28 -0800 (In reply to comment #6) > (In reply to comment #4) > > Created an attachment (id=219274) [details] [details] > > implemented the RA > > > > I wrote Chaitin's algorithm. It was enjoyable. > > wrong patch? Yeah. 959950 8 219282 fpizlo 2013-12-15 14:13:53 -0800 Created attachment 219282 for real this time 959958 9 219285 fpizlo 2013-12-15 18:20:06 -0800 Created attachment 219285 more 959979 10 219293 fpizlo 2013-12-15 20:49:36 -0800 Created attachment 219293 more 959982 11 219293 oliver 2013-12-15 21:08:33 -0800 Comment on attachment 219293 more View in context: https://bugs.webkit.org/attachment.cgi?id=219293&action=review > Source/JavaScriptCore/dfg/DFGAllocationUnit.h:106 > + uintptr_t m_word; Can we make this a bitfield rather than manually doing it? Or do you foresee these varying at runtime in future? 959987 12 fpizlo 2013-12-15 21:27:45 -0800 (In reply to comment #11) > (From update of attachment 219293 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=219293&action=review > > > Source/JavaScriptCore/dfg/DFGAllocationUnit.h:106 > > + uintptr_t m_word; > > Can we make this a bitfield rather than manually doing it? Or do you foresee these varying at runtime in future? How would this be a bitfield? How do you envision a bitfield for pointers? 960093 13 219293 oliver 2013-12-16 09:46:45 -0800 Comment on attachment 219293 more View in context: https://bugs.webkit.org/attachment.cgi?id=219293&action=review >>> Source/JavaScriptCore/dfg/DFGAllocationUnit.h:106 >>> + uintptr_t m_word; >> >> Can we make this a bitfield rather than manually doing it? Or do you foresee these varying at runtime in future? > > How would this be a bitfield? How do you envision a bitfield for pointers? Sorry, i missed it being purely a pointer - i just saw it being used in shift operations. My bad 960400 14 219397 fpizlo 2013-12-16 22:01:14 -0800 Created attachment 219397 less I think I have a better way of dealing with scratch registers. 986177 15 225612 fpizlo 2014-03-02 14:56:15 -0800 Created attachment 225612 more 219257 2013-12-14 13:44:58 -0800 2013-12-14 15:08:43 -0800 work in progress blah.patch text/plain 30637 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9ieXRlY29kZS9EYXRhRm9ybWF0LmgKPT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PQotLS0gU291cmNlL0phdmFTY3JpcHRDb3JlL2J5dGVjb2RlL0RhdGFGb3JtYXQuaAkocmV2 aXNpb24gMTYwNTk5KQorKysgU291cmNlL0phdmFTY3JpcHRDb3JlL2J5dGVjb2RlL0RhdGFGb3Jt YXQuaAkod29ya2luZyBjb3B5KQpAQCAtMTI0LDYgKzEyNCwxNiBAQCBpbmxpbmUgYm9vbCBpc0pT Qm9vbGVhbihEYXRhRm9ybWF0IGZvcm1hCiAgICAgcmV0dXJuIGlzSlNGb3JtYXQoZm9ybWF0LCBE YXRhRm9ybWF0SlNCb29sZWFuKTsKIH0KIAoraW5saW5lIGJvb2wgdXNlc0ZQUihEYXRhRm9ybWF0 IGZvcm1hdCkKK3sKKyAgICByZXR1cm4gZm9ybWF0ID09IERhdGFGb3JtYXREb3VibGU7CiB9CiAK 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