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History

Alina Sbirlea 2493ab105d [SCEV] Add option to forget everything in SCEV. Summary: Create a method to forget everything in SCEV. Add a cl::opt and PassManagerBuilder option to use this in LoopUnroll. Motivation: Certain Halide applications spend a very long time compiling in forgetLoop, and prefer to forget everything and rebuild SCEV from scratch. Sample difference in compile time reduction: 21.04 to 14.78 using current ToT release build. Testcase showcasing this cannot be opensourced and is fairly large. The option disabled by default, but it may be desirable to enable by default. Evidence in favor (two difference runs on different days/ToT state): File Before (s) After (s) clang-9.bc 7267.91 6639.14 llvm-as.bc 194.12 194.12 llvm-dis.bc 62.50 62.50 opt.bc 1855.85 1857.53 File Before (s) After (s) clang-9.bc 8588.70 7812.83 llvm-as.bc 196.20 194.78 llvm-dis.bc 61.55 61.97 opt.bc 1739.78 1886.26 Reviewers: sanjoy Subscribers: mehdi_amini, jlebar, zzheng, javed.absar, dmgreen, jdoerfert, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D60144 llvm-svn: 358304		2019-04-12 19:16:07 +00:00
..
AliasAnalysis.cpp	[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.	2019-03-22 17:22:19 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
AssumptionCache.cpp	[CodeExtractor] Update function's assumption cache after extracting blocks from it	2019-02-08 06:55:18 +00:00
BasicAliasAnalysis.cpp	Add an optional list of blocks to avoid when looking for a path in isPotentiallyReachable.	2019-04-02 01:05:48 +00:00
BlockFrequencyInfo.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
BlockFrequencyInfoImpl.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
BranchProbabilityInfo.cpp	[BPI] Look through bitcasts in calcZeroHeuristic	2019-02-15 11:50:21 +00:00
CallGraph.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CallGraphSCCPass.cpp	Fix IR/Analysis layering issue with OptBisect	2019-02-28 04:00:55 +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	Add an optional list of blocks to avoid when looking for a path in isPotentiallyReachable.	2019-04-02 01:05:48 +00:00
CFG.cpp	An unreachable block may have a route to a reachable block, don't fast-path return that it can't.	2019-04-04 23:09:40 +00:00
CFGPrinter.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CFLAndersAliasAnalysis.cpp	[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.	2019-03-22 17:22:19 +00:00
CFLGraph.h	Move CFLGraph and the AA summary code over to the new `CallBase`	2019-02-11 09:25:41 +00:00
CFLSteensAliasAnalysis.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CGSCCPassManager.cpp	[NewPM] Fix a nasty bug with analysis invalidation in the new PM.	2019-03-28 00:51:36 +00:00
CMakeLists.txt	Move DomTreeUpdater from IR to Analysis	2019-02-06 02:52:52 +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	[ConstantFolding] Fix GetConstantFoldFPValue to avoid cast overflow.	2019-03-22 16:37:37 +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	[DA][NewPM] Handle transitive dependencies in the new-pm version of DA	2019-02-03 12:25:41 +00:00
DivergenceAnalysis.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[IR] Refactor attribute methods in Function class (NFC)	2019-04-04 22:40:06 +00:00
GuardUtils.cpp	[WideableCond] Fix a nasty bug in detection of "explicit guards"	2019-04-02 16:51:43 +00:00
IndirectCallPromotionAnalysis.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
InlineCost.cpp	[IR] Refactor attribute methods in Function class (NFC)	2019-04-04 22:40:06 +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: Fold round intrinsics from sitofp/uitofp	2019-04-03 00:25:06 +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
IteratedDominanceFrontier.cpp	[IDF] Delete a redundant J-edge test	2019-03-07 11:42:59 +00:00
IVDescriptors.cpp	Reland "Relax constraints for reduction vectorization"	2019-03-12 01:31:44 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
LazyCallGraph.cpp	[LCG] Add aliased functions as LCG roots	2019-04-05 18:51:08 +00:00
LazyValueInfo.cpp	[ConstantRange] Add getFull() + getEmpty() named constructors; NFC	2019-03-24 09:34:40 +00:00
LegacyDivergenceAnalysis.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
Lint.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[Analysis] Fix isSafeToLoadUnconditionally handling of volatile.	2019-01-24 21:31:13 +00:00
LoopAccessAnalysis.cpp	[NFC] fix trivial typos in comments	2019-02-05 08:30:48 +00:00
LoopAnalysisManager.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
LoopInfo.cpp	[llvm][NFC] Factor out logic for getting incoming & back Loop edges	2019-03-29 17:39:17 +00:00
LoopPass.cpp	[IR] Refactor attribute methods in Function class (NFC)	2019-04-04 22:40:06 +00:00
LoopUnrollAnalyzer.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
MemoryBuiltins.cpp	Fix a hang when lowering __builtin_dynamic_object_size	2019-04-10 23:42:11 +00:00
MemoryDependenceAnalysis.cpp	[MemDepAnalysis] Allow caller to pass in an OrderedBasicBlock.	2019-03-28 19:17:31 +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] Small fix for the clobber limit.	2019-04-12 18:48:46 +00:00
MemorySSAUpdater.cpp	[MemorySSA] Don't optimize incomplete phis.	2019-03-29 21:16:31 +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	[ThinLTO] Restructure AliasSummary to contain ValueInfo of Aliasee	2019-03-15 15:11:38 +00:00
MustExecute.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
OptimizationRemarkEmitter.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
OrderedBasicBlock.cpp	Recommit "[DSE] Preserve basic block ordering using OrderedBasicBlock."	2019-03-29 14:10:24 +00:00
OrderedInstructions.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[PGO] Context sensitive PGO (part 2)	2019-02-28 19:55:07 +00:00
PtrUseVisitor.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[SCEV] Add option to forget everything in SCEV.	2019-04-12 19:16:07 +00:00
ScalarEvolutionAliasAnalysis.cpp	[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.	2019-03-22 17:22:19 +00:00
ScalarEvolutionExpander.cpp	[SCEV] Guard movement of insertion point for loop-invariants	2019-03-18 18:52:35 +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	Hide two unused debugging methods, NFCI.	2019-03-01 17:15:21 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Use llvm::lower_bound. NFC	2019-04-12 02:02:06 +00:00
TargetTransformInfo.cpp	[ScalarizeMaskedMemIntrin] Add support for scalarizing expandload and compressstore intrinsics.	2019-03-21 17:38:52 +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] Change if-else chain into switch in computeKnownBitsFromAssume	2019-04-11 13:02:19 +00:00
VectorUtils.cpp	[Vectorizer] Add vectorization support for fixed smul/umul intrinsics	2019-02-25 15:42:02 +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))

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