152420 2015-12-17 23:27:25 -0800 [JSC] Streamline Tmp indexing inside the register allocator 2015-12-19 13:06:35 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 150903 1 benjamin benjamin commit-queue fpizlo ggaren keith_miller mark.lam msaboff saam oldest_to_newest 1150221 0 benjamin 2015-12-17 23:27:25 -0800 [JSC] Streamline Tmp indexing inside the register allocator 1150225 1 267615 benjamin 2015-12-17 23:34:30 -0800 Created attachment 267615 Patch 1150226 2 commit-queue 2015-12-17 23:36:31 -0800 Attachment 267615 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:870: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 1 in 3 files If any of these errors are false positives, please file a bug against check-webkit-style. 1150308 3 267615 ggaren 2015-12-18 10:05:01 -0800 Comment on attachment 267615 Patch r=me 1150391 4 267615 fpizlo 2015-12-18 14:37:55 -0800 Comment on attachment 267615 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=267615&action=review > Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:89 > + AbstractIteratedRegisterCoalescingAllocator(const Vector<Reg>& regsInPriorityOrder, IndexType lastPrecoloredRegisterIndex, unsigned tmpArraySize) This should take Code&, and the class should have a field called Code& m_code, and all other helper functions should be members of this class if at all possible. I think that there are two good reasons for this: 1) Consistency. All phases currently make Code& available to all helpers, either by making those helpers be lambdas that close over Code& or by having a helper class that holds a Code& m_code property. Also, all phases currently make it easy to share state with all helper functions, for example if we need to run some analysis and stash the results so that they can be reused throughout the phase. They do it by making all helper functions either be lambdas that close over [&] or by making them member functions inside the helper class. 2) Hackability. It's within bounds to add new code that relies on Code& or on some additional analysis. If we write phases using your style, then anytime we need to modify the phase to make use of some new analysis, we'll have to thread this analysis through all of the functions/classes. If we write phases using the style that all other phases use, then it's easy to make use of new analyses. An example of this is the work I'm doing right now to teach IRC that Move32 is sometimes coalescable. To do that, I need mayBeCoalescable() to have access to Code& plus two other analyses. Had you written IRC using the same style as the other phases, this would have been easy. But now I'm going to essentially have to hack IRC to do what other phases do, or I'll have to thread Code& plus the two other analyses as arguments to all of the standalone functions that call mayBeCoalescable(). That's not fun. 1150392 5 267615 fpizlo 2015-12-18 14:40:23 -0800 Comment on attachment 267615 Patch Marking r- because in its current form, this refactoring would make it very difficult to add Move32 coalescing. 1150405 6 fpizlo 2015-12-18 15:31:02 -0800 Benjamin: check out the WIP patch in https://bugs.webkit.org/show_bug.cgi?id=152365. Notice how this adds a TmpWidth member to the main class of IRC, and then it uses it from a lot of places. I want this kind of extension to be easy to add to any phase. Roughly, inside any part of a phase, it should be possible to easily insert code that queries some analysis. It's easy if all of the code in the phase shares some common lexical scope or class instance. It's not easy if the phase has a lot of code in standalone functions. This is why the other phases all try to share some lexical scope or some class instance. In the past, I was ambivalent towards IRC adopting its own style, but now I think that there is an actual argument in favor of using a common style that makes it easy to write these kinds of improvements. Can you do your refactoring in such a way that there is a class that holds all of the code in the phase, and all of the functionality has a pointer to an instance of that class? 1150547 7 267690 benjamin 2015-12-19 10:10:42 -0800 Created attachment 267690 Patch 1150548 8 benjamin 2015-12-19 10:12:25 -0800 Does that work for you? m_tmpWidth would be ownned by IteratedRegisterCoalescing. It will then be used by each ColoringAllocator to build its own graph. 1150549 9 commit-queue 2015-12-19 10:12:41 -0800 Attachment 267690 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:773: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/b3/air/AirIteratedRegisterCoalescing.cpp:842: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 2 in 3 files If any of these errors are false positives, please file a bug against check-webkit-style. 1150553 10 267690 benjamin 2015-12-19 10:36:12 -0800 Comment on attachment 267690 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=267690&action=review > Source/JavaScriptCore/ChangeLog:8 > + AirIteratedRegisterCoalescing has been allocating a bit of mess over time. Typo: allocating->accumulating > Source/JavaScriptCore/ChangeLog:13 > + with half of the function using Tmp, the other using indices. the other -> the other half 1150563 11 267696 benjamin 2015-12-19 11:17:10 -0800 Created attachment 267696 Patch for landing 1150576 12 fpizlo 2015-12-19 12:40:43 -0800 The failing test that is blocking commit-queue is not related to B3. I'm going to land this myself. 1150579 13 fpizlo 2015-12-19 13:06:08 -0800 Landed in http://trac.webkit.org/changeset/194316 267615 2015-12-17 23:34:30 -0800 2015-12-19 10:10:34 -0800 Patch bug-152420-20151218083348.patch text/plain 58918 benjamin U3VidmVyc2lvbiBSZXZpc2lvbjogMTk0MTAxCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBm Yzc2NzZmMDllZjI2MWUwOWI4ZDc4YjdmNDEyYjRhODgzMDFlYzM5Li5lYTQzMjU4MTU0Y2UwZjQ0 MWY3NWVkM2YwZDI3YzBiNjY1M2YzNjViIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwzMiBAQAorMjAxNS0xMi0xNyAgQmVuamFtaW4gUG91bGFpbiAgPGJwb3VsYWluQGFwcGxl LmNvbT4KKworICAgICAgICBbSlNDXSBTdHJlYW1saW5lIFRtcCBpbmRleGluZyBpbnNpZGUgdGhl IHJlZ2lzdGVyIGFsbG9jYXRvcgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93 X2J1Zy5jZ2k/aWQ9MTUyNDIwCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISku 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