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History

Eli Friedman 2fb6d274be [SCEV] Simplify/generalize howFarToZero solving.

Make SolveLinEquationWithOverflow take the start as a SCEV, so we can
solve more cases. With that implemented, get rid of the special case
for powers of two.

The additional functionality probably isn't particularly useful,
but it might help a little for certain cases involving pointer
arithmetic.

Differential Revision: https://reviews.llvm.org/D28884

llvm-svn: 293576

2017-01-31 00:42:42 +00:00

AliasAnalysis.cpp

[AliasAnalysis] Fences do not modify constant memory location

2017-01-20 00:21:33 +00:00

AliasAnalysisEvaluator.cpp

Consistently use FunctionAnalysisManager

2016-08-09 00:28:15 +00:00

AliasAnalysisSummary.cpp

Update a comment.

2016-08-25 01:29:55 +00:00

AliasAnalysisSummary.h

Make some LLVM_CONSTEXPR variables const. NFC.

2016-08-25 01:05:08 +00:00

AliasSetTracker.cpp

[AliasSetTracker] Make AST smarter about assume intrinsics that don't actually affect memory.

2016-11-07 14:11:45 +00:00

Analysis.cpp

[LCSSA] Perform LCSSA verification only for the current loop nest.

2016-10-28 12:57:20 +00:00

AssumptionCache.cpp

[ValueTracking] recognize a 'not' of an assumed condition as false

2017-01-17 18:15:49 +00:00

BasicAliasAnalysis.cpp

Fix BasicAA incorrect assumption on GEP

2017-01-27 16:12:22 +00:00

BlockFrequencyInfo.cpp

[PGO] add debug option to view annotated cfg after prof use annotation

2017-01-23 18:58:24 +00:00

BlockFrequencyInfoImpl.cpp

Cleanup dump() functions.

2017-01-28 02:02:38 +00:00

BranchProbabilityInfo.cpp

Retry: [BPI] Use a safer constructor to calculate branch probabilities

2016-12-17 01:02:08 +00:00

CallGraph.cpp

Cleanup dump() functions.

2017-01-28 02:02:38 +00:00

CallGraphSCCPass.cpp

Improve the -filter-print-funcs option to skip the banner for CGSCC pass when nothing is to be printed

2017-01-18 21:37:11 +00:00

CallPrinter.cpp

…

CaptureTracking.cpp

…

CFG.cpp

…

CFGPrinter.cpp

[PM] Port CFGViewer and CFGPrinter to the new Pass Manager

2016-09-15 18:35:27 +00:00

CFLAndersAliasAnalysis.cpp

Apply clang-tidy's performance-unnecessary-value-param to LLVM.

2017-01-13 14:39:03 +00:00

CFLGraph.h

[CFLAA] Check for pointer types in more places.

2016-07-29 01:23:45 +00:00

CFLSteensAliasAnalysis.cpp

[PM] Change the static object whose address is used to uniquely identify

2016-11-23 17:53:26 +00:00

CGSCCPassManager.cpp

Rewind instantiations of OuterAnalysisManagerProxy in r289317, r291651, and r291662.

2017-01-25 04:26:29 +00:00

CMakeLists.txt

[PM] Separate the LoopAnalysisManager from the LoopPassManager and move

2017-01-11 09:43:56 +00:00

CodeMetrics.cpp

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

ConstantFolding.cpp

[Analysis] Add LibFunc_ prefix to enums in TargetLibraryInfo. (NFC)

2017-01-23 23:16:46 +00:00

CostModel.cpp

[X86] updating TTI costs for arithmetic instructions on X86\SLM arch.

2017-01-11 08:23:37 +00:00

Delinearization.cpp

…

DemandedBits.cpp

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

DependenceAnalysis.cpp

Cleanup dump() functions.

2017-01-28 02:02:38 +00:00

DivergenceAnalysis.cpp

…

DominanceFrontier.cpp

[PM] Introduce an analysis set used to preserve all analyses over

2017-01-15 06:32:49 +00:00

DomPrinter.cpp

…

EHPersonalities.cpp

[tsan] Add support for C++ exceptions into TSan (call __tsan_func_exit during unwinding), LLVM part

2016-11-14 21:41:13 +00:00

GlobalsModRef.cpp

[PM] Change the static object whose address is used to uniquely identify

2016-11-23 17:53:26 +00:00

IndirectCallPromotionAnalysis.cpp

Remove another unused variable from r275216

2016-07-12 23:49:17 +00:00

InlineCost.cpp

Improve PGO support for the new inliner

2017-01-20 22:44:04 +00:00

InstCount.cpp

…

InstructionSimplify.cpp

[InstSimplify] try to eliminate icmp Pred (add nsw X, C1), C2

2017-01-24 17:03:24 +00:00

Interval.cpp

Apply clang-tidy's modernize-loop-convert to lib/Analysis.

2016-06-26 17:27:42 +00:00

IntervalPartition.cpp

Apply clang-tidy's modernize-loop-convert to lib/Analysis.

2016-06-26 17:27:42 +00:00

IteratedDominanceFrontier.cpp

Normalize file docs. NFC.

2016-07-21 20:52:35 +00:00

IVUsers.cpp

[PM] Separate the LoopAnalysisManager from the LoopPassManager and move

2017-01-11 09:43:56 +00:00

LazyBlockFrequencyInfo.cpp

[BPI] Add new LazyBPI analysis

2016-07-28 23:31:12 +00:00

LazyBranchProbabilityInfo.cpp

[BPI] Add new LazyBPI analysis

2016-07-28 23:31:12 +00:00

LazyCallGraph.cpp

Cleanup dump() functions.

2017-01-28 02:02:38 +00:00

LazyValueInfo.cpp

[PM] Use PoisoningVH correctly when merely deleting entries in a map

2017-01-26 08:31:54 +00:00

Lint.cpp

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

LLVMBuild.txt

Restore "[ThinLTO] Prevent exporting of locals used/defined in module level asm"

2016-11-14 17:12:32 +00:00

Loads.cpp

[Loads] Fix crash in is isDereferenceableAndAlignedPointer()

2016-10-28 15:32:28 +00:00

LoopAccessAnalysis.cpp

[SLP] Vectorize loads of consecutive memory accesses, accessed in non-consecutive (jumbled) way.

2017-01-28 17:59:44 +00:00

LoopAnalysisManager.cpp

Rewind instantiations of OuterAnalysisManagerProxy in r289317, r291651, and r291662.

2017-01-25 04:26:29 +00:00

LoopInfo.cpp

Make VerifyDomInfo and VerifyLoopInfo global variables

2017-01-24 05:52:07 +00:00

LoopPass.cpp

Reverted: Track validity of pass results

2017-01-15 10:23:18 +00:00

LoopUnrollAnalyzer.cpp

[LoopUnrollAnalyzer] Handle out of bounds accesses in visitLoad

2016-07-23 02:56:49 +00:00

MemDepPrinter.cpp

Apply clang-tidy's modernize-loop-convert to lib/Analysis.

2016-06-26 17:27:42 +00:00

MemDerefPrinter.cpp

…

MemoryBuiltins.cpp

[Analysis] Add LibFunc_ prefix to enums in TargetLibraryInfo. (NFC)

2017-01-23 23:16:46 +00:00

MemoryDependenceAnalysis.cpp

[Devirtualization] MemDep returns non-local !invariant.group dependencies

2017-01-12 11:33:58 +00:00

MemoryLocation.cpp

[Analysis] Add LibFunc_ prefix to enums in TargetLibraryInfo. (NFC)

2017-01-23 23:16:46 +00:00

ModuleDebugInfoPrinter.cpp

[IR] Remove the DIExpression field from DIGlobalVariable.

2016-12-20 02:09:43 +00:00

ModuleSummaryAnalysis.cpp

Add missing dependency to "Module Summary Analysis" pass

2017-01-21 06:01:22 +00:00

ObjCARCAliasAnalysis.cpp

Consistently use FunctionAnalysisManager

2016-08-09 00:28:15 +00:00

ObjCARCAnalysisUtils.cpp

…

ObjCARCInstKind.cpp

Create llvm.addressofreturnaddress intrinsic

2016-10-12 22:13:19 +00:00

OptimizationDiagnosticInfo.cpp

[llc] Add -pass-remarks-output

2017-01-26 00:39:51 +00:00

OrderedBasicBlock.cpp

…

PHITransAddr.cpp

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

PostDominators.cpp

[PM] Introduce an analysis set used to preserve all analyses over

2017-01-15 06:32:49 +00:00

ProfileSummaryInfo.cpp

Compute summary before calling extractProfTotalWeight

2017-01-14 00:32:37 +00:00

PtrUseVisitor.cpp

…

README.txt

…

RegionInfo.cpp

[PM] Introduce an analysis set used to preserve all analyses over

2017-01-15 06:32:49 +00:00

RegionPass.cpp

Reverted: Track validity of pass results

2017-01-15 10:23:18 +00:00

RegionPrinter.cpp

Apply clang-tidy's modernize-loop-convert to lib/Analysis.

2016-06-26 17:27:42 +00:00

ScalarEvolution.cpp

[SCEV] Simplify/generalize howFarToZero solving.

2017-01-31 00:42:42 +00:00

ScalarEvolutionAliasAnalysis.cpp

[PM] Change the static object whose address is used to uniquely identify

2016-11-23 17:53:26 +00:00

ScalarEvolutionExpander.cpp

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

ScalarEvolutionNormalization.cpp

…

ScopedNoAliasAA.cpp

[PM] Change the static object whose address is used to uniquely identify

2016-11-23 17:53:26 +00:00

SparsePropagation.cpp

Apply clang-tidy's modernize-loop-convert to lib/Analysis.

2016-06-26 17:27:42 +00:00

StratifiedSets.h

Do a sweep over move ctors and remove those that are identical to the default.

2016-10-20 12:20:28 +00:00

TargetLibraryInfo.cpp

[Analysis] Add LibFunc_ prefix to enums in TargetLibraryInfo. (NFC)

2017-01-23 23:16:46 +00:00

TargetTransformInfo.cpp

NVPTX: Refactor NVPTXInferAddressSpaces to check TTI

2017-01-30 23:02:12 +00:00

Trace.cpp

…

TypeBasedAliasAnalysis.cpp

[TBAA] Don't generate invalid TBAA when merging nodes

2016-12-11 20:07:25 +00:00

TypeMetadataUtils.cpp

Analysis: Add appropriate const qualification to functions in TypeMetadataUtils.cpp. NFC.

2017-01-27 22:55:30 +00:00

ValueTracking.cpp

[ValueTracking] clean up lookThroughCast; NFCI

2017-01-29 16:34:57 +00:00

VectorUtils.cpp

IR: Change the gep_type_iterator API to avoid always exposing the "current" type.

2016-12-02 02:24:42 +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))

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