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Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00
..
AliasAnalysis.cpp
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AliasAnalysisEvaluator.cpp
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AliasAnalysisSummary.cpp
Update a comment.
2016-08-25 01:29:55 +00:00
AliasAnalysisSummary.h
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AliasSetTracker.cpp
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Analysis.cpp
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AssumptionCache.cpp
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BasicAliasAnalysis.cpp
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BlockFrequencyInfo.cpp
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BlockFrequencyInfoImpl.cpp
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BranchProbabilityInfo.cpp
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CallGraph.cpp
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CallGraphSCCPass.cpp
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CallPrinter.cpp
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CaptureTracking.cpp
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CFG.cpp
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CFGPrinter.cpp
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CFLAndersAliasAnalysis.cpp
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CFLGraph.h
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CFLSteensAliasAnalysis.cpp
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CGSCCPassManager.cpp
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CMakeLists.txt
[stack-safety] Empty local passes for Stack Safety Local Analysis
2018-11-26 21:57:47 +00:00
CmpInstAnalysis.cpp
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CodeMetrics.cpp
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ConstantFolding.cpp
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CostModel.cpp
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Delinearization.cpp
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DemandedBits.cpp
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DependenceAnalysis.cpp
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DivergenceAnalysis.cpp
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DominanceFrontier.cpp
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DomPrinter.cpp
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EHPersonalities.cpp
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GlobalsModRef.cpp
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GuardUtils.cpp
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IndirectCallPromotionAnalysis.cpp
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InlineCost.cpp
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InstCount.cpp
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InstructionPrecedenceTracking.cpp
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InstructionSimplify.cpp
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Interval.cpp
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IntervalPartition.cpp
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IteratedDominanceFrontier.cpp
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IVDescriptors.cpp
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IVUsers.cpp
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LazyBlockFrequencyInfo.cpp
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LazyBranchProbabilityInfo.cpp
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LazyCallGraph.cpp
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LazyValueInfo.cpp
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LegacyDivergenceAnalysis.cpp
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Lint.cpp
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LLVMBuild.txt
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Loads.cpp
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LoopAccessAnalysis.cpp
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LoopAnalysisManager.cpp
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LoopInfo.cpp
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LoopPass.cpp
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LoopUnrollAnalyzer.cpp
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MemDepPrinter.cpp
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MemDerefPrinter.cpp
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MemoryBuiltins.cpp
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MemoryDependenceAnalysis.cpp
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MemoryLocation.cpp
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MemorySSA.cpp
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MemorySSAUpdater.cpp
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ModuleDebugInfoPrinter.cpp
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ModuleSummaryAnalysis.cpp
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MustExecute.cpp
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ObjCARCAliasAnalysis.cpp
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ObjCARCAnalysisUtils.cpp
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ObjCARCInstKind.cpp
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OptimizationRemarkEmitter.cpp
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OrderedBasicBlock.cpp
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OrderedInstructions.cpp
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PHITransAddr.cpp
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PhiValues.cpp
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PostDominators.cpp
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ProfileSummaryInfo.cpp
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PtrUseVisitor.cpp
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README.txt
…
RegionInfo.cpp
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RegionPass.cpp
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RegionPrinter.cpp
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ScalarEvolution.cpp
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ScalarEvolutionAliasAnalysis.cpp
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ScalarEvolutionExpander.cpp
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ScalarEvolutionNormalization.cpp
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ScopedNoAliasAA.cpp
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StackSafetyAnalysis.cpp
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StratifiedSets.h
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SyncDependenceAnalysis.cpp
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SyntheticCountsUtils.cpp
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TargetLibraryInfo.cpp
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TargetTransformInfo.cpp
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Trace.cpp
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TypeBasedAliasAnalysis.cpp
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TypeMetadataUtils.cpp
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ValueLattice.cpp
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ValueLatticeUtils.cpp
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ValueTracking.cpp
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VectorUtils.cpp
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README.txt 

Analysis Opportunities:

//===---------------------------------------------------------------------===//

In test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll, the
ScalarEvolution expression for %r is this:

  {1,+,3,+,2}<loop>

Outside the loop, this could be evaluated simply as (%n * %n), however
ScalarEvolution currently evaluates it as

  (-2 + (2 * (trunc i65 (((zext i64 (-2 + %n) to i65) * (zext i64 (-1 + %n) to i65)) /u 2) to i64)) + (3 * %n))

In addition to being much more complicated, it involves i65 arithmetic,
which is very inefficient when expanded into code.

//===---------------------------------------------------------------------===//

In formatValue in test/CodeGen/X86/lsr-delayed-fold.ll,

ScalarEvolution is forming this expression:

((trunc i64 (-1 * %arg5) to i32) + (trunc i64 %arg5 to i32) + (-1 * (trunc i64 undef to i32)))

This could be folded to

(-1 * (trunc i64 undef to i32))

//===---------------------------------------------------------------------===//