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llvm-mirror/lib/Analysis
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Alina Sbirlea 413877fd20 [MemorySSA] Extend removeMemoryAccess API to optimize MemoryPhis. 
Summary:
EarlyCSE needs to optimize MemoryPhis after an access is removed and has
special handling for it. This should be handled by MemorySSA instead.
The default remains that MemoryPhis are *not* optimized after an access
is removed.

Reviewers: george.burgess.iv

Subscribers: sanjoy, jlebar, llvm-commits, Prazek

Differential Revision: https://reviews.llvm.org/D57199

llvm-svn: 352787
2019-01-31 20:13:47 +00:00
..
AliasAnalysis.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
AliasAnalysisEvaluator.cpp
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2019-01-19 08:50:56 +00:00
AliasAnalysisSummary.cpp
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AliasAnalysisSummary.h
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2019-01-19 08:50:56 +00:00
AliasSetTracker.cpp
[AliasSetTracker] Cleanup more comments. [NFCI]
2019-01-28 19:38:03 +00:00
Analysis.cpp
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2019-01-19 08:50:56 +00:00
AssumptionCache.cpp
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2019-01-19 08:50:56 +00:00
BasicAliasAnalysis.cpp
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2019-01-19 08:50:56 +00:00
BlockFrequencyInfo.cpp
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BlockFrequencyInfoImpl.cpp
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BranchProbabilityInfo.cpp
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2019-01-19 08:50:56 +00:00
CallGraph.cpp
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CallGraphSCCPass.cpp
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CallPrinter.cpp
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CaptureTracking.cpp
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2019-01-19 08:50:56 +00:00
CFG.cpp
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CFGPrinter.cpp
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2019-01-19 08:50:56 +00:00
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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2019-01-19 08:50:56 +00:00
DependenceAnalysis.cpp
[NFC] fix trivial typos in comments
2019-01-30 05:26:31 +00:00
DivergenceAnalysis.cpp
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2019-01-19 08:50:56 +00:00
DominanceFrontier.cpp
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DomPrinter.cpp
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EHPersonalities.cpp
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GlobalsModRef.cpp
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2019-01-19 08:50:56 +00:00
GuardUtils.cpp
[NFC] Add function to parse widenable conditional branches
2019-01-22 11:21:32 +00:00
IndirectCallPromotionAnalysis.cpp
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2019-01-19 08:50:56 +00:00
InlineCost.cpp
Test commit. NFCI.
2019-01-31 08:49:20 +00:00
InstCount.cpp
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2019-01-19 08:50:56 +00:00
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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2019-01-19 08:50:56 +00:00
LazyBlockFrequencyInfo.cpp
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LazyBranchProbabilityInfo.cpp
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LazyCallGraph.cpp
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2019-01-19 08:50:56 +00:00
LazyValueInfo.cpp
[CVP] Use LVI to constant fold deopt operands
2019-01-22 01:34:33 +00:00
LegacyDivergenceAnalysis.cpp
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Lint.cpp
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LLVMBuild.txt
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2019-01-19 08:50:56 +00:00
Loads.cpp
[Analysis] Fix isSafeToLoadUnconditionally handling of volatile.
2019-01-24 21:31:13 +00:00
LoopAccessAnalysis.cpp
[NFC] fix trivial typos in comments
2019-01-30 05:26:31 +00:00
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
Add a 'dynamic' parameter to the objectsize intrinsic
2019-01-30 20:34:35 +00:00
MemoryDependenceAnalysis.cpp
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MemoryLocation.cpp
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MemorySSA.cpp
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2019-01-19 08:50:56 +00:00
MemorySSAUpdater.cpp
[MemorySSA] Extend removeMemoryAccess API to optimize MemoryPhis.
2019-01-31 20:13:47 +00:00
ModuleDebugInfoPrinter.cpp
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ModuleSummaryAnalysis.cpp
[ThinLTO] Add option to dump per-module summary dot graph
2019-01-28 23:43:26 +00:00
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
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RegionInfo.cpp
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RegionPass.cpp
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RegionPrinter.cpp
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2019-01-19 08:50:56 +00:00
ScalarEvolution.cpp
[SCEV] Prohibit SCEV transformations for huge SCEVs
2019-01-31 06:19:25 +00:00
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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2019-01-19 08:50:56 +00:00
ValueTracking.cpp
[NFC] fix trivial typos in comments
2019-01-30 05:26:31 +00:00
VectorUtils.cpp
Move saturated arithmetic intrinsics to other integer intrinsics. NFCI.
2019-01-23 13:49:10 +00:00

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))

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