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adddf2a5ad
This reverts commit 11dccf8d3aa5d55210f8b886fb21926c7a8353ca. A bootstrapped clang crashes (due to ArrayRef::front called on an empty ArrayRef) when compiling some files. Very strangely, this only reproduces with modules. ``` 13 0x0000564d3349e968 llvm::ArrayRef<llvm::BasicBlock*>::front() const /proc/self/cwd/llvm/include/llvm/ADT/ArrayRef.h:160:7 14 0x0000564d3349e896 llvm::LoopBase<llvm::BasicBlock, llvm::Loop>::getHeader() const /proc/self/cwd/llvm/include/llvm/Analysis/LoopInfo.h:104:50 15 0x0000564d3349fd9d llvm::LoopBase<llvm::BasicBlock, llvm::Loop>::getLoopLatch() const /proc/self/cwd/llvm/include/llvm/Analysis/LoopInfoImpl.h:210:11 16 0x0000564d33593c8a llvm::ScalarEvolution::computeBackedgeTakenCount(llvm::Loop const*, bool) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:6933:15 17 0x0000564d33592ebc llvm::ScalarEvolution::getBackedgeTakenInfo(llvm::Loop const*) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:0:30 18 0x0000564d33593a54 llvm::ScalarEvolution::getBackedgeTakenCount(llvm::Loop const*, llvm::ScalarEvolution::ExitCountKind) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:6487:36 19 0x0000564d32be2402 llvm::ScalarEvolution::getConstantMaxBackedgeTakenCount(llvm::Loop const*) /proc/self/cwd/llvm/include/llvm/Analysis/ScalarEvolution.h:768:5 20 0x0000564d33590807 llvm::ScalarEvolution::getRangeRef(llvm::SCEV const*, llvm::ScalarEvolution::RangeSignHint) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:5495:19 21 0x0000564d320abab7 llvm::ScalarEvolution::getSignedRange(llvm::SCEV const*) /proc/self/cwd/llvm/include/llvm/Analysis/ScalarEvolution.h:840:12 22 0x0000564d335a03aa llvm::ScalarEvolution::isKnownPredicateViaConstantRanges(llvm::CmpInst::Predicate, llvm::SCEV const*, llvm::SCEV const*) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:9239:60 23 0x0000564d33586a80 llvm::ScalarEvolution::isKnownViaNonRecursiveReasoning(llvm::CmpInst::Predicate, llvm::SCEV const*, llvm::SCEV const*) /proc/self/cwd/llvm/lib/Analysis/ScalarEvolution.cpp:10284:60 ``` |
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| .. | ||
| ADCE | ||
| AddDiscriminators | ||
| AggressiveInstCombine | ||
| AlignmentFromAssumptions | ||
| ArgumentPromotion | ||
| AtomicExpand | ||
| Attributor | ||
| BDCE | ||
| BlockExtractor | ||
| BranchFolding | ||
| CalledValuePropagation | ||
| CallSiteSplitting | ||
| CanonicalizeAliases | ||
| CanonicalizeFreezeInLoops | ||
| CodeExtractor | ||
| CodeGenPrepare | ||
| ConstantHoisting | ||
| ConstantMerge | ||
| ConstraintElimination | ||
| Coroutines | ||
| CorrelatedValuePropagation | ||
| CrossDSOCFI | ||
| DCE | ||
| DeadArgElim | ||
| DeadStoreElimination | ||
| DivRemPairs | ||
| EarlyCSE | ||
| EliminateAvailableExternally | ||
| EntryExitInstrumenter | ||
| ExpandMemCmp | ||
| FixIrreducible | ||
| Float2Int | ||
| ForcedFunctionAttrs | ||
| FunctionAttrs | ||
| FunctionImport | ||
| GCOVProfiling | ||
| GlobalDCE | ||
| GlobalMerge | ||
| GlobalOpt | ||
| GlobalSplit | ||
| GuardWidening | ||
| GVN | ||
| GVNHoist | ||
| GVNSink | ||
| HardwareLoops | ||
| HelloNew | ||
| HotColdSplit | ||
| IndirectBrExpand | ||
| IndVarSimplify | ||
| InferAddressSpaces | ||
| InferFunctionAttrs | ||
| Inline | ||
| InstCombine | ||
| InstMerge | ||
| InstNamer | ||
| InstSimplify | ||
| InterleavedAccess | ||
| Internalize | ||
| IRCE | ||
| JumpThreading | ||
| LCSSA | ||
| LICM | ||
| LoadStoreVectorizer | ||
| LoopDataPrefetch | ||
| LoopDeletion | ||
| LoopDistribute | ||
| LoopFusion | ||
| LoopIdiom | ||
| LoopInstSimplify | ||
| LoopInterchange | ||
| LoopLoadElim | ||
| LoopPredication | ||
| LoopReroll | ||
| LoopRotate | ||
| LoopSimplify | ||
| LoopSimplifyCFG | ||
| LoopStrengthReduce | ||
| LoopTransformWarning | ||
| LoopUnroll | ||
| LoopUnrollAndJam | ||
| LoopUnswitch | ||
| LoopVectorize | ||
| LoopVersioning | ||
| LoopVersioningLICM | ||
| LowerAtomic | ||
| LowerConstantIntrinsics | ||
| LowerExpectIntrinsic | ||
| LowerGuardIntrinsic | ||
| LowerInvoke | ||
| LowerMatrixIntrinsics | ||
| LowerSwitch | ||
| LowerTypeTests | ||
| LowerWidenableCondition | ||
| MakeGuardsExplicit | ||
| Mem2Reg | ||
| MemCpyOpt | ||
| MergeFunc | ||
| MergeICmps | ||
| MetaRenamer | ||
| NameAnonGlobals | ||
| NaryReassociate | ||
| NewGVN | ||
| ObjCARC | ||
| OpenMP | ||
| PartialInlining | ||
| PartiallyInlineLibCalls | ||
| PGOProfile | ||
| PhaseOrdering | ||
| PlaceSafepoints | ||
| PreISelIntrinsicLowering | ||
| PruneEH | ||
| Reassociate | ||
| Reg2Mem | ||
| RewriteStatepointsForGC | ||
| SafeStack | ||
| SampleProfile | ||
| ScalarizeMaskedMemIntrin | ||
| Scalarizer | ||
| SCCP | ||
| SeparateConstOffsetFromGEP | ||
| SimpleLoopUnswitch | ||
| SimplifyCFG | ||
| Sink | ||
| SLPVectorizer | ||
| SpeculateAroundPHIs | ||
| SpeculativeExecution | ||
| SROA | ||
| StraightLineStrengthReduce | ||
| StripDeadPrototypes | ||
| StripSymbols | ||
| StructurizeCFG | ||
| SyntheticCountsPropagation | ||
| TailCallElim | ||
| ThinLTOBitcodeWriter | ||
| TypePromotion/ARM | ||
| UnifyFunctionExitNodes | ||
| UnifyLoopExits | ||
| UniqueInternalLinkageNames | ||
| Util | ||
| VectorCombine | ||
| WholeProgramDevirt | ||