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History

Nikita Popov ab6e561d30 [BasicAA] Make sure types match in constant offset heuristic This can only happen if offset types that are larger than the pointer size are involved. The previous implementation did not assert in this case because it initialized the APInts to the width of one of the variables -- though I strongly suspect it did not compute correct results in this case. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32621 reported by fhahn.		2021-03-28 21:38:09 +02:00
..
models/inliner
AliasAnalysis.cpp
AliasAnalysisEvaluator.cpp
AliasAnalysisSummary.cpp
AliasAnalysisSummary.h
AliasSetTracker.cpp
Analysis.cpp
AssumeBundleQueries.cpp
AssumptionCache.cpp
BasicAliasAnalysis.cpp	[BasicAA] Make sure types match in constant offset heuristic	2021-03-28 21:38:09 +02:00
BlockFrequencyInfo.cpp
BlockFrequencyInfoImpl.cpp
BranchProbabilityInfo.cpp
CallGraph.cpp
CallGraphSCCPass.cpp
CallPrinter.cpp
CaptureTracking.cpp
CFG.cpp
CFGPrinter.cpp
CFLAndersAliasAnalysis.cpp
CFLGraph.h
CFLSteensAliasAnalysis.cpp
CGSCCPassManager.cpp
CMakeLists.txt
CmpInstAnalysis.cpp
CodeMetrics.cpp
ConstantFolding.cpp
ConstraintSystem.cpp
CostModel.cpp
DDG.cpp
DDGPrinter.cpp
Delinearization.cpp
DemandedBits.cpp
DependenceAnalysis.cpp
DependenceGraphBuilder.cpp
DevelopmentModeInlineAdvisor.cpp
DivergenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
DomTreeUpdater.cpp
EHPersonalities.cpp
FunctionPropertiesAnalysis.cpp
GlobalsModRef.cpp
GuardUtils.cpp
HeatUtils.cpp
ImportedFunctionsInliningStatistics.cpp
IndirectCallPromotionAnalysis.cpp
InlineAdvisor.cpp
InlineCost.cpp	Reapply [InlineCost] Enable the cost benefit analysis on FDO	2021-03-25 21:51:38 -07:00
InlineSizeEstimatorAnalysis.cpp
InstCount.cpp
InstructionPrecedenceTracking.cpp
InstructionSimplify.cpp	[InstSimplify] Fix unused variable warning (NFC)	2021-03-24 09:56:36 +08:00
Interval.cpp
IntervalPartition.cpp
IRSimilarityIdentifier.cpp
IVDescriptors.cpp
IVUsers.cpp
LazyBlockFrequencyInfo.cpp
LazyBranchProbabilityInfo.cpp
LazyCallGraph.cpp
LazyValueInfo.cpp
LegacyDivergenceAnalysis.cpp
Lint.cpp
Loads.cpp	Make FindAvailableLoadedValue TBAA aware	2021-03-24 17:20:26 +00:00
LoopAccessAnalysis.cpp	Fix a miscompile introduced by 99203f2.	2021-03-25 16:53:58 -07:00
LoopAnalysisManager.cpp
LoopCacheAnalysis.cpp
LoopInfo.cpp
LoopNestAnalysis.cpp
LoopPass.cpp
LoopUnrollAnalyzer.cpp
MemDepPrinter.cpp
MemDerefPrinter.cpp
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp
MemoryLocation.cpp
MemorySSA.cpp	[MSSA] Extending IsGuaranteedLoopInvariant to support an instruction defined in the entry block	2021-03-23 21:50:56 +00:00
MemorySSAUpdater.cpp
MLInlineAdvisor.cpp
ModuleDebugInfoPrinter.cpp
ModuleSummaryAnalysis.cpp
MustExecute.cpp
ObjCARCAliasAnalysis.cpp
ObjCARCAnalysisUtils.cpp
ObjCARCInstKind.cpp
OptimizationRemarkEmitter.cpp
PHITransAddr.cpp
PhiValues.cpp
PostDominators.cpp
ProfileSummaryInfo.cpp
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ReleaseModeModelRunner.cpp
ReplayInlineAdvisor.cpp
ScalarEvolution.cpp	[SCEV] Improve handling of not expressions in isImpliedCond()	2021-03-24 21:53:02 +01:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionDivision.cpp
ScalarEvolutionNormalization.cpp
ScopedNoAliasAA.cpp
StackLifetime.cpp
StackSafetyAnalysis.cpp
StratifiedSets.h
SyncDependenceAnalysis.cpp
SyntheticCountsUtils.cpp
TargetLibraryInfo.cpp
TargetTransformInfo.cpp	Revert "[Passes] Add relative lookup table converter pass"	2021-03-24 18:59:33 +00:00
TFUtils.cpp
Trace.cpp
TypeBasedAliasAnalysis.cpp
TypeMetadataUtils.cpp
ValueLattice.cpp
ValueLatticeUtils.cpp
ValueTracking.cpp	[ValueTracking] Handle shl pair in isKnownNonEqual()	2021-03-26 20:21:05 +01:00
VectorUtils.cpp
VFABIDemangling.cpp

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))

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