154782 2016-02-27 16:34:08 -0800 FTL should lower its abstract heaps to B3 heap ranges 2016-02-28 13:07:38 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All RESOLVED FIXED P2 Normal --- 154658 1 fpizlo fpizlo commit-queue keith_miller mark.lam msaboff saam oldest_to_newest 1168920 0 fpizlo 2016-02-27 16:34:08 -0800 Patch forthcoming. 1168921 1 fpizlo 2016-02-27 16:34:47 -0800 This should unlock more load elimination in B3. It's also essential for doing a good job on store elimination. 1168926 2 272427 fpizlo 2016-02-27 16:38:07 -0800 Created attachment 272427 work in progress 1168950 3 272435 fpizlo 2016-02-27 20:11:07 -0800 Created attachment 272435 the patch 1168951 4 commit-queue 2016-02-27 20:13:30 -0800 Attachment 272435 did not pass style-queue: ERROR: Source/JavaScriptCore/ftl/FTLAbstractHeap.cpp:109: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h:135: JSCell_freeListNext is incorrectly named. Don't use underscores in your identifier names. [readability/naming/underscores] [4] Total errors found: 2 in 10 files If any of these errors are false positives, please file a bug against check-webkit-style. 1169007 5 272435 saam 2016-02-28 11:10:12 -0800 Comment on attachment 272435 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=272435&action=review > Source/JavaScriptCore/ChangeLog:27 > + unnecessary here sine we tightly control the height of the heap hierarchy. typo: since > Source/JavaScriptCore/b3/B3HeapRange.h:62 > + // Detects overflow in debug mode. Ranges are compiler-controlled so this is not likely > + // to ever be an issue. I don't think this comment is needed. > Source/JavaScriptCore/ftl/FTLAbstractHeap.cpp:87 > + current = child->range().end(); Should this be taking the max() function? Or are children sorted? > Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h:201 > + // It's super tempting to use lambdas for this, but I suspect that we'll create enough of > + // these that we want to do it the hard way. I don't think this comment is needed. 1169014 6 fpizlo 2016-02-28 12:32:28 -0800 (In reply to comment #5) > Comment on attachment 272435 [details] > the patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=272435&action=review > > > Source/JavaScriptCore/ChangeLog:27 > > + unnecessary here sine we tightly control the height of the heap hierarchy. > > typo: since Fixed. > > > Source/JavaScriptCore/b3/B3HeapRange.h:62 > > + // Detects overflow in debug mode. Ranges are compiler-controlled so this is not likely > > + // to ever be an issue. > > I don't think this comment is needed. Removed. > > > Source/JavaScriptCore/ftl/FTLAbstractHeap.cpp:87 > > + current = child->range().end(); > > Should this be taking the max() function? Or are children sorted? No, and they're not sorted. This line of code ensures its own correctness: the next iteration's call to compute() will take the last iteration's end. The compute() method takes begin as an argument, and sets the range such that the end is greater than the begin. Therefore, 'current' is always the current max. > > > Source/JavaScriptCore/ftl/FTLAbstractHeapRepository.h:201 > > + // It's super tempting to use lambdas for this, but I suspect that we'll create enough of > > + // these that we want to do it the hard way. > > I don't think this comment is needed. Removed. 1169015 7 fpizlo 2016-02-28 12:34:14 -0800 Landed in http://trac.webkit.org/changeset/197299 1169023 8 272435 saam 2016-02-28 13:07:38 -0800 Comment on attachment 272435 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=272435&action=review >>> Source/JavaScriptCore/ftl/FTLAbstractHeap.cpp:87 >>> + current = child->range().end(); >> >> Should this be taking the max() function? Or are children sorted? > > No, and they're not sorted. This line of code ensures its own correctness: the next iteration's call to compute() will take the last iteration's end. The compute() method takes begin as an argument, and sets the range such that the end is greater than the begin. Therefore, 'current' is always the current max. Right. 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