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c5d014c133
This patch introduces a new KnownBits struct that wraps the two APInt used by computeKnownBits. This allows us to treat them as more of a unit. Initially I've just altered the signatures of computeKnownBits and InstCombine's simplifyDemandedBits to pass a KnownBits reference instead of two separate APInt references. I'll do similar to the SelectionDAG version of computeKnownBits/simplifyDemandedBits as a separate patch. I've added a constructor that allows initializing both APInts to the same bit width with a starting value of 0. This reduces the repeated pattern of initializing both APInts. Once place default constructed the APInts so I added a default constructor for those cases. Going forward I would like to add more methods that will work on the pairs. For example trunc, zext, and sext occur on both APInts together in several places. We should probably add a clear method that can be used to clear both pieces. Maybe a method to check for conflicting information. A method to return (Zero|One) so we don't write it out everywhere. Maybe a method for (Zero|One).isAllOnesValue() to determine if all bits are known. I'm sure there are many other methods we can come up with. Differential Revision: https://reviews.llvm.org/D32376 llvm-svn: 301432 |
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| .. | ||
| AliasAnalysis.h | ||
| AliasAnalysisEvaluator.h | ||
| AliasSetTracker.h | ||
| AssumptionCache.h | ||
| BasicAliasAnalysis.h | ||
| BlockFrequencyInfo.h | ||
| BlockFrequencyInfoImpl.h | ||
| BranchProbabilityInfo.h | ||
| CallGraph.h | ||
| CallGraphSCCPass.h | ||
| CallPrinter.h | ||
| CaptureTracking.h | ||
| CFG.h | ||
| CFGPrinter.h | ||
| CFLAndersAliasAnalysis.h | ||
| CFLSteensAliasAnalysis.h | ||
| CGSCCPassManager.h | ||
| CodeMetrics.h | ||
| ConstantFolding.h | ||
| DemandedBits.h | ||
| DependenceAnalysis.h | ||
| DivergenceAnalysis.h | ||
| DominanceFrontier.h | ||
| DominanceFrontierImpl.h | ||
| DomPrinter.h | ||
| DOTGraphTraitsPass.h | ||
| EHPersonalities.h | ||
| GlobalsModRef.h | ||
| IndirectCallPromotionAnalysis.h | ||
| IndirectCallSiteVisitor.h | ||
| InlineCost.h | ||
| InstructionSimplify.h | ||
| Interval.h | ||
| IntervalIterator.h | ||
| IntervalPartition.h | ||
| IteratedDominanceFrontier.h | ||
| IVUsers.h | ||
| LazyBlockFrequencyInfo.h | ||
| LazyBranchProbabilityInfo.h | ||
| LazyCallGraph.h | ||
| LazyValueInfo.h | ||
| Lint.h | ||
| Loads.h | ||
| LoopAccessAnalysis.h | ||
| LoopAnalysisManager.h | ||
| LoopInfo.h | ||
| LoopInfoImpl.h | ||
| LoopIterator.h | ||
| LoopPass.h | ||
| LoopUnrollAnalyzer.h | ||
| MemoryBuiltins.h | ||
| MemoryDependenceAnalysis.h | ||
| MemoryLocation.h | ||
| MemorySSA.h | ||
| MemorySSAUpdater.h | ||
| ModuleSummaryAnalysis.h | ||
| ObjCARCAliasAnalysis.h | ||
| ObjCARCAnalysisUtils.h | ||
| ObjCARCInstKind.h | ||
| ObjectUtils.h | ||
| OptimizationDiagnosticInfo.h | ||
| OrderedBasicBlock.h | ||
| Passes.h | ||
| PHITransAddr.h | ||
| PostDominators.h | ||
| ProfileSummaryInfo.h | ||
| PtrUseVisitor.h | ||
| RegionInfo.h | ||
| RegionInfoImpl.h | ||
| RegionIterator.h | ||
| RegionPass.h | ||
| RegionPrinter.h | ||
| ScalarEvolution.h | ||
| ScalarEvolutionAliasAnalysis.h | ||
| ScalarEvolutionExpander.h | ||
| ScalarEvolutionExpressions.h | ||
| ScalarEvolutionNormalization.h | ||
| ScopedNoAliasAA.h | ||
| SparsePropagation.h | ||
| TargetFolder.h | ||
| TargetLibraryInfo.def | ||
| TargetLibraryInfo.h | ||
| TargetTransformInfo.h | ||
| TargetTransformInfoImpl.h | ||
| Trace.h | ||
| TypeBasedAliasAnalysis.h | ||
| TypeMetadataUtils.h | ||
| ValueTracking.h | ||
| VectorUtils.h | ||