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Fangrui Song 03a15eec9e [Dominators] Fix and optimize edge insertion of depth-based search 
Summary:
After (x,y) is inserted, depth-based search finds all affected v that satisfies:

depth(nca(x,y))+1 < depth(v) && there exists a path P from y to v where every w on P satisfies depth(v) <= depth(w)

This reduces to a widest path problem (maximizing the depth of the
minimum vertex in the path) which can be solved by a modified version of
Dijkstra with a bucket queue (named depth-based search in the paper).

The algorithm visits vertices in decreasing order of bucket number.
However, the current code misused priority_queue to extract them in
increasing order. I cannot think of a failing scenario but it surely may
process vertices more than once due to the local usage of Processed.

This patch fixes this bug and simplifies/optimizes the code a bit. Also
add more comments.

Reviewers: kuhar

Reviewed By: kuhar

Subscribers: kristina, jdoerfert, llvm-commits, NutshellySima, brzycki

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58349

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354306 91177308-0d34-0410-b5e6-96231b3b80d8
2019-02-19 05:16:52 +00:00
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Solaris/sys
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AArch64TargetParser.def
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AArch64TargetParser.h
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AlignOf.h
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Allocator.h
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AMDGPUMetadata.h
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AMDHSAKernelDescriptor.h
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ARMAttributeParser.h
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ARMBuildAttributes.h
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ARMEHABI.h
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ARMTargetParser.def
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ARMTargetParser.h
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ARMWinEH.h
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ArrayRecycler.h
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Atomic.h
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AtomicOrdering.h
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BinaryByteStream.h
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BinaryItemStream.h
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BinaryStream.h
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BinaryStreamArray.h
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BinaryStreamError.h
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BinaryStreamReader.h
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BinaryStreamRef.h
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BinaryStreamWriter.h
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BlockFrequency.h
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BranchProbability.h
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BuryPointer.h
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CachePruning.h
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Capacity.h
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Casting.h
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CBindingWrapping.h
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CFGUpdate.h
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CheckedArithmetic.h
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Chrono.h
[Chrono] Remove ATTRIBUTE_ALWAYS inline from Chrono.h.
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circular_raw_ostream.h
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CMakeLists.txt
[CMake] Unify scripts for generating VCS headers
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CodeGen.h
Add enum values to CodeGenOpt::Level
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CodeGenCoverage.h
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COM.h
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CommandLine.h
Recommit: Add support for prefix-only CLI options
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Compiler.h
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Compression.h
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ConvertUTF.h
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CrashRecoveryContext.h
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DataExtractor.h
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DataTypes.h
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Debug.h
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DebugCounter.h
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DJB.h
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DOTGraphTraits.h
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DynamicLibrary.h
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Endian.h
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EndianStream.h
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Errc.h
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Errno.h
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Error.h
Attempt to fix buildbot after r353679 #2
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ErrorHandling.h
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ErrorOr.h
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FileCheck.h
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FileOutputBuffer.h
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FileSystem.h
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FileUtilities.h
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Format.h
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FormatAdapters.h
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FormatCommon.h
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FormatProviders.h
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FormattedStream.h
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FormatVariadic.h
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FormatVariadicDetails.h
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GenericDomTree.h
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GenericDomTreeConstruction.h
[Dominators] Fix and optimize edge insertion of depth-based search
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GlobPattern.h
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GraphWriter.h
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Host.h
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InitLLVM.h
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ItaniumManglingCanonicalizer.h
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JamCRC.h
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JSON.h
[JSON] Work around excess-precision issue when comparing T_Integer numbers.
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KnownBits.h
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LEB128.h
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LICENSE.TXT
Merge System into Support.
2010-11-29 18:16:10 +00:00
LineIterator.h
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Locale.h
[NFC] Header cleanup
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LockFileManager.h
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LowLevelTypeImpl.h
GlobalISel: Try to make legalize rules more useful for vectors
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MachineValueType.h
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ManagedStatic.h
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MathExtras.h
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MD5.h
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MemAlloc.h
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Memory.h
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MemoryBuffer.h
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MipsABIFlags.h
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MSVCErrorWorkarounds.h
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Mutex.h
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MutexGuard.h
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NativeFormatting.h
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OnDiskHashTable.h
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Options.h
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Parallel.h
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Path.h
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PluginLoader.h
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PointerLikeTypeTraits.h
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PrettyStackTrace.h
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Printable.h
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Process.h
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Program.h
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RandomNumberGenerator.h
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raw_os_ostream.h
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raw_ostream.h
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raw_sha1_ostream.h
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Recycler.h
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RecyclingAllocator.h
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Regex.h
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Registry.h
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ReverseIteration.h
[ADT] Enable reverse iteration for DenseMap
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RWMutex.h
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SaveAndRestore.h
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ScaledNumber.h
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ScopedPrinter.h
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SHA1.h
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Signals.h
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SmallVectorMemoryBuffer.h
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SMLoc.h
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SourceMgr.h
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SpecialCaseList.h
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StringPool.h
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StringSaver.h
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SwapByteOrder.h
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SymbolRemappingReader.h
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SystemUtils.h
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TargetOpcodes.def
GlobalISel: Add G_FCANONICALIZE instruction
2019-02-11 17:05:20 +00:00
TargetParser.h
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TargetRegistry.h
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TargetSelect.h
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TarWriter.h
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TaskQueue.h
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thread.h
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Threading.h
Support: use internal call_once on PPC64le
2019-02-14 18:36:52 +00:00
ThreadLocal.h
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ThreadPool.h
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Timer.h
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ToolOutputFile.h
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TrailingObjects.h
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TrigramIndex.h
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type_traits.h
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2019-01-22 13:57:29 +00:00
TypeName.h
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Unicode.h
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UnicodeCharRanges.h
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UniqueLock.h
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Valgrind.h
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VersionTuple.h
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VirtualFileSystem.h
Reapply [VFS] Allow multiple RealFileSystem instances with independent CWDs.
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Watchdog.h
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Win64EH.h
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WindowsError.h
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WithColor.h
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X86DisassemblerDecoderCommon.h
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X86TargetParser.def
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xxhash.h
Make ICF log output order deterministic.
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YAMLParser.h
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YAMLTraits.h
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