llvm-project

History

Florian Hahn 98f11a7d75 [SCEV] Handle case where MaxBECount is less precise than ExactBECount for OR. In some cases, MaxBECount can be less precise than ExactBECount for AND and OR (the AND case was PR26207). In the OR test case, both ExactBECounts are undef, but MaxBECount are different, so we hit the assertion below. This patch uses the same solution the AND case already uses. Assertion failed: ((isa<SCEVCouldNotCompute>(ExactNotTaken) \|\| !isa<SCEVCouldNotCompute>(MaxNotTaken)) && "Exact is not allowed to be less precise than Max"), function ExitLimit This patch also consolidates test cases for both AND and OR in a single test case. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13245 Reviewers: sanjoy, efriedma, mkazantsev Reviewed By: sanjoy Differential Revision: https://reviews.llvm.org/D58853 llvm-svn: 355259		2019-03-02 02:31:44 +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	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	[BasicAA] Cache nonEscapingLocalObjects for alias() calls.	2019-02-05 23:52:08 +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
CFG.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
CMakeLists.txt	Move DomTreeUpdater from IR to Analysis	2019-02-06 02:52:52 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[CallSite removal] Migrate ConstantFolding APIs and implementation to	2019-02-11 07:51:44 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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
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
DominanceFrontier.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[NFC] fix trivial typos in comments	2019-02-05 08:30:48 +00:00
GuardUtils.cpp	[NFC] Add function to parse widenable conditional branches	2019-01-22 11:21:32 +00:00
IVDescriptors.cpp	Move DomTreeUpdater from IR to Analysis	2019-02-06 02:52:52 +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
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	Revert "[INLINER] allow inlining of address taken blocks"	2019-02-14 23:42:21 +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] remove zero-shift-guard fold for general funnel shift	2019-02-26 18:26:56 +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	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
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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
LazyValueInfo.cpp	[NFC] fix trivial typos in comments	2019-02-05 08:30:48 +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
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	Refactor setAlreadyUnrolled() and setAlreadyVectorized().	2019-02-11 19:45:44 +00:00
LoopPass.cpp	Fix IR/Analysis layering issue with OptBisect	2019-02-28 04:00:55 +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	Add a 'dynamic' parameter to the objectsize intrinsic	2019-01-30 20:34:35 +00:00
MemoryDependenceAnalysis.cpp	[NFC] Fix typos: preceeding -> preceding	2019-02-23 01:28:32 +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] Remove verifyClobberSanity.	2019-02-11 19:51:21 +00:00
MemorySSAUpdater.cpp	[MemorySSA] Make insertDef insert corresponding phi nodes.	2019-02-27 22:20:22 +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] Add option to dump per-module summary dot graph	2019-01-28 23:43:26 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Fix IR/Analysis layering issue with OptBisect	2019-02-28 04:00:55 +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] Handle case where MaxBECount is less precise than ExactBECount for OR.	2019-03-02 02:31:44 +00:00
ScalarEvolutionAliasAnalysis.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ScalarEvolutionExpander.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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	[TargetLibraryInfo] Update run time support for Windows	2019-02-11 22:12:01 +00:00
TargetTransformInfo.cpp	[LSR] Generate cross iteration indexes	2019-02-07 13:32:54 +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	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +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] Known bits support for unsigned saturating add/sub	2019-03-01 20:07:04 +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))

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