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History

Simon Moll 2afc6e83ea [sda][nfc] clang-formatting		2020-08-27 18:27:44 +02:00
..
models/inliner	[MLInliner] Simplify TFUTILS_SUPPORTED_TYPES	2020-08-25 14:19:39 -07:00
AliasAnalysis.cpp	[opt][NewPM] Add basic-aa in legacy PM compatibility mode	2020-08-21 14:05:07 -07:00
AliasAnalysisEvaluator.cpp
AliasAnalysisSummary.cpp
AliasAnalysisSummary.h
AliasSetTracker.cpp
Analysis.cpp	[NFC] Port InstCount pass to new pass manager	2020-08-21 12:39:42 +03:00
AssumeBundleQueries.cpp
AssumptionCache.cpp
BasicAliasAnalysis.cpp
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	[NewPM][PassInstrumentation] Add PreservedAnalyses parameter to AfterPass* callbacks	2020-08-21 16:10:42 +07:00
CMakeLists.txt
CmpInstAnalysis.cpp
CodeMetrics.cpp
ConstantFolding.cpp
CostModel.cpp
DDG.cpp
Delinearization.cpp
DemandedBits.cpp
DependenceAnalysis.cpp
DependenceGraphBuilder.cpp
DevelopmentModeInlineAdvisor.cpp	[MLInliner] Support training that doesn't require partial rewards	2020-08-24 17:36:29 -07:00
DivergenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
DomTreeUpdater.cpp
EHPersonalities.cpp
FunctionPropertiesAnalysis.cpp
GlobalsModRef.cpp
GuardUtils.cpp
HeatUtils.cpp
IndirectCallPromotionAnalysis.cpp
InlineAdvisor.cpp
InlineCost.cpp
InlineSizeEstimatorAnalysis.cpp
InstCount.cpp	[NFC] Port InstCount pass to new pass manager	2020-08-21 12:39:42 +03:00
InstructionPrecedenceTracking.cpp
InstructionSimplify.cpp	[InstSimplify][EarlyCSE] Try to CSE PHI nodes in the same basic block	2020-08-27 18:47:04 +03:00
Interval.cpp
IntervalPartition.cpp
IVDescriptors.cpp
IVUsers.cpp
LazyBlockFrequencyInfo.cpp
LazyBranchProbabilityInfo.cpp
LazyCallGraph.cpp
LazyValueInfo.cpp
LegacyDivergenceAnalysis.cpp
Lint.cpp
LLVMBuild.txt
Loads.cpp
LoopAccessAnalysis.cpp
LoopAnalysisManager.cpp
LoopCacheAnalysis.cpp
LoopInfo.cpp
LoopNestAnalysis.cpp	[LoopNest] False negative of `arePerfectlyNested` with LCSSA loops	2020-08-25 16:20:52 +00:00
LoopPass.cpp
LoopUnrollAnalyzer.cpp
MemDepPrinter.cpp
MemDerefPrinter.cpp
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	[MemDep] Use BatchAA when computing pointer dependencies	2020-08-25 21:34:34 +02:00
MemoryLocation.cpp
MemorySSA.cpp
MemorySSAUpdater.cpp	[DomTree] Extend update API to allow a post CFG view.	2020-08-21 17:23:08 -07:00
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] Still trying to fix windows buildbots	2020-08-24 10:26:48 +01:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionDivision.cpp
ScalarEvolutionNormalization.cpp
ScopedNoAliasAA.cpp
StackLifetime.cpp
StackSafetyAnalysis.cpp
StratifiedSets.h
SyncDependenceAnalysis.cpp	[sda][nfc] clang-formatting	2020-08-27 18:27:44 +02:00
SyntheticCountsUtils.cpp
TargetLibraryInfo.cpp
TargetTransformInfo.cpp
TFUtils.cpp	[MLInliner] Simplify TFUTILS_SUPPORTED_TYPES	2020-08-25 14:19:39 -07:00
Trace.cpp
TypeBasedAliasAnalysis.cpp
TypeMetadataUtils.cpp
ValueLattice.cpp
ValueLatticeUtils.cpp
ValueTracking.cpp	[ValueTracking] Support select in findAllocaForValue	2020-08-27 02:13:52 -07:00
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))

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