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llvm-mirror/lib/Analysis
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Philip Reames caf2d0f40c [LV] Support invariant addresses in speculation logic 
Implement a TODO from rL371452, and handle loop invariant addresses in predicated blocks. If we can prove that the load is safe to speculate into the header, then we can avoid using a masked.load in favour of a normal load.

This is mostly about vectorization robustness. In the common case, it's generally expected that LICM/LoadStorePromotion would have eliminated such loads entirely.

Differential Revision: https://reviews.llvm.org/D67372

llvm-svn: 371745
2019-09-12 16:49:10 +00:00
..
AliasAnalysis.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
AliasAnalysisEvaluator.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
AliasAnalysisSummary.cpp
Move CFLGraph and the AA summary code over to the new CallBase
2019-02-11 09:25:41 +00:00
AliasAnalysisSummary.h
Move CFLGraph and the AA summary code over to the new CallBase
2019-02-11 09:25:41 +00:00
AliasSetTracker.cpp
[LICM/MSSA] Add promotion to scalars by building an AliasSetTracker with MemorySSA.
2019-02-06 20:25:17 +00:00
Analysis.cpp
[MustExec] Add a generic "must-be-executed-context" explorer
2019-08-23 15:17:27 +00:00
AssumptionCache.cpp
AssumptionCache: remove old affected values after RAUW.
2019-08-16 09:34:27 +00:00
BasicAliasAnalysis.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
BlockFrequencyInfo.cpp
Add optional arg to profile count getters to filter
2019-04-24 19:51:16 +00:00
BlockFrequencyInfoImpl.cpp
Add optional arg to profile count getters to filter
2019-04-24 19:51:16 +00:00
BranchProbabilityInfo.cpp
[BPI] Adjust the probability for floating point unordered comparison
2019-09-10 17:25:11 +00:00
CallGraph.cpp
Revert "[CallGraph] Refine call graph for indirect calls with !callees metadata"
2019-08-16 10:59:18 +00:00
CallGraphSCCPass.cpp
[CallSite removal] Move the legacy PM, call graph, and some inliner
2019-04-19 05:59:42 +00:00
CallPrinter.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
CaptureTracking.cpp
[CaptureTracker] Let subclasses provide dereferenceability information
2019-08-19 21:56:38 +00:00
CFG.cpp
Recommit "[GVN] Preserve loop related analysis/canonical forms."
2019-07-31 09:27:54 +00:00
CFGPrinter.cpp
Rename F_{None,Text,Append} to OF_{None,Text,Append}. NFC
2019-08-05 05:43:48 +00:00
CFLAndersAliasAnalysis.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
CFLGraph.h
[CFLGraph] Add support for unary fneg instruction.
2019-06-06 19:21:23 +00:00
CFLSteensAliasAnalysis.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
CGSCCPassManager.cpp
Revert "[CallGraph] Refine call graph for indirect calls with !callees metadata"
2019-08-16 10:59:18 +00:00
CMakeLists.txt
Title: Loop Cache Analysis
2019-08-09 13:56:29 +00:00
CmpInstAnalysis.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
CodeMetrics.cpp
Remove CallSite from the CodeMetrics analysis, moving it to the new
2019-02-11 09:03:32 +00:00
ConstantFolding.cpp
[ConstProp] allow folding for fma that produces NaN
2019-09-12 14:10:50 +00:00
CostModel.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
Delinearization.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
DemandedBits.cpp
[DemandedBits] Remove some redundancy in the work list
2019-03-03 14:50:01 +00:00
DependenceAnalysis.cpp
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
DivergenceAnalysis.cpp
[DivergenceAnalysis] Add methods for querying divergence at use
2019-07-29 10:22:09 +00:00
DominanceFrontier.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
DomPrinter.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
DomTreeUpdater.cpp
[DTU] Refine the interface and logic of applyUpdates
2019-02-22 13:48:38 +00:00
EHPersonalities.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
GlobalsModRef.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
GuardUtils.cpp
[WideableCond] Fix a nasty bug in detection of "explicit guards"
2019-04-02 16:51:43 +00:00
IndirectCallPromotionAnalysis.cpp
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
InlineCost.cpp
[InstSimplify] Rename SimplifyFPUnOp and SimplifyFPBinOp
2019-07-24 12:50:10 +00:00
InstCount.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
InstructionPrecedenceTracking.cpp
Make widenable condition transparent for MemoryWriteTracking
2019-02-14 11:10:29 +00:00
InstructionSimplify.cpp
[InstSimplify] simplifyUnsignedRangeCheck(): handle more cases (PR43251)
2019-09-12 09:26:17 +00:00
Interval.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
IntervalPartition.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
IVDescriptors.cpp
Save the induction binary operator in IVDescriptors for non FP induction variables.
2019-05-14 13:26:36 +00:00
IVUsers.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
LazyBlockFrequencyInfo.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
LazyBranchProbabilityInfo.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
LazyCallGraph.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
LazyValueInfo.cpp
[LVI] Look through extractvalue of insertvalue
2019-09-07 12:03:59 +00:00
LegacyDivergenceAnalysis.cpp
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
Lint.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
LLVMBuild.txt
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
Loads.cpp
[LV] Support invariant addresses in speculation logic
2019-09-12 16:49:10 +00:00
LoopAccessAnalysis.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
LoopAnalysisManager.cpp
[LoopPassManager + MemorySSA] Only enable use of MemorySSA for LPMs known to preserve it.
2019-08-21 17:00:57 +00:00
LoopCacheAnalysis.cpp
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
LoopInfo.cpp
[LOOPINFO] Introduce the loop guard API.
2019-07-25 16:13:18 +00:00
LoopPass.cpp
ftime-trace: Trace loop passes
2019-05-31 10:14:04 +00:00
LoopUnrollAnalyzer.cpp
[InstSimplify] Rename SimplifyFPUnOp and SimplifyFPBinOp
2019-07-24 12:50:10 +00:00
MemDepPrinter.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
MemDerefPrinter.cpp
OpaquePtr: add Type parameter to Loads analysis API.
2019-07-09 11:35:35 +00:00
MemoryBuiltins.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
MemoryDependenceAnalysis.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
MemoryLocation.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
MemorySSA.cpp
[MemorySSA] Do not create memoryaccesses for debug info intrinsics.
2019-09-10 22:35:27 +00:00
MemorySSAUpdater.cpp
[MemorySSA] Fix insertUse.
2019-08-27 00:34:47 +00:00
ModuleDebugInfoPrinter.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ModuleSummaryAnalysis.cpp
IR. Change strip* family of functions to not look through aliases.
2019-08-22 19:56:14 +00:00
MustExecute.cpp
[MustExec] Add a generic "must-be-executed-context" explorer
2019-08-23 15:17:27 +00:00
ObjCARCAliasAnalysis.cpp
[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.
2019-03-22 17:22:19 +00:00
ObjCARCAnalysisUtils.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ObjCARCInstKind.cpp
[ObjC][ARC] Delete ObjC runtime calls on global variables annotated
2019-06-14 22:06:32 +00:00
OptimizationRemarkEmitter.cpp
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
OrderedBasicBlock.cpp
Recommit "[DSE] Preserve basic block ordering using OrderedBasicBlock."
2019-03-29 14:10:24 +00:00
OrderedInstructions.cpp
[llvm] Migrate llvm::make_unique to std::make_unique
2019-08-15 15:54:37 +00:00
PHITransAddr.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
PhiValues.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
PostDominators.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ProfileSummaryInfo.cpp
Cleanup: llvm::bsearch -> llvm::partition_point after r364719
2019-06-30 11:19:56 +00:00
PtrUseVisitor.cpp
SROA: Allow eliminating addrspacecasted allocas
2019-06-14 21:38:31 +00:00
README.txt
…
RegionInfo.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
RegionPass.cpp
[IR] Refactor attribute methods in Function class (NFC)
2019-04-04 22:40:06 +00:00
RegionPrinter.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ScalarEvolution.cpp
Change TargetLibraryInfo analysis passes to always require Function
2019-09-07 03:09:36 +00:00
ScalarEvolutionAliasAnalysis.cpp
[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.
2019-03-22 17:22:19 +00:00
ScalarEvolutionExpander.cpp
[SCEV] Fix for PR42397. SCEVExpander wrongly adds nsw to shl instruction.
2019-07-08 18:03:43 +00:00
ScalarEvolutionNormalization.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ScopedNoAliasAA.cpp
[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.
2019-03-22 17:22:19 +00:00
StackSafetyAnalysis.cpp
IR. Change strip* family of functions to not look through aliases.
2019-08-22 19:56:14 +00:00
StratifiedSets.h
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
SyncDependenceAnalysis.cpp
[SDA] Bug fix: Use IPD outside the loop as divergence bound
2019-04-18 16:17:35 +00:00
SyntheticCountsUtils.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
TargetLibraryInfo.cpp
[TLI][AMDGPU] AMDPAL does not have library functions
2019-09-11 07:26:39 +00:00
TargetTransformInfo.cpp
[LLVM][Alignment] Convert isLegalNTStore/isLegalNTLoad to llvm::Align
2019-09-05 13:09:42 +00:00
Trace.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
TypeBasedAliasAnalysis.cpp
[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.
2019-03-22 17:22:19 +00:00
TypeMetadataUtils.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ValueLattice.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ValueLatticeUtils.cpp
Update the file headers across all of the LLVM projects in the monorepo
2019-01-19 08:50:56 +00:00
ValueTracking.cpp
[ValueTracking] Factor our common speculation suppression logic [NFC]
2019-09-10 21:12:29 +00:00
VectorUtils.cpp
[Intrinsic] Add the llvm.umul.fix.sat intrinsic
2019-09-07 12:16:14 +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))

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