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llvm-project/llvm/lib/Analysis
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Whitney Tsang 8ee361ebe5 [LOOPINFO] Introduce the loop guard API. 
Summary:
This is the first patch for the loop guard. We introduced
getLoopGuardBranch() and isGuarded().
This currently only works on simplified loop, as it requires a preheader
and a latch to identify the guard.
It will work on loops of the form:
/// GuardBB:
///   br cond1, Preheader, ExitSucc <== GuardBranch
/// Preheader:
///   br Header
/// Header:
///  ...
///   br Latch
/// Latch:
///   br cond2, Header, ExitBlock
/// ExitBlock:
///   br ExitSucc
/// ExitSucc:
Prior discussions leading upto the decision to introduce the loop guard
API: http://lists.llvm.org/pipermail/llvm-dev/2019-May/132607.html
Reviewer: reames, kbarton, hfinkel, jdoerfert, Meinersbur, dmgreen
Reviewed By: reames
Subscribers: wuzish, hiraditya, jsji, llvm-commits, bmahjour, etiotto
Tag: LLVM
Differential Revision: https://reviews.llvm.org/D63885

llvm-svn: 367033
2019-07-25 16:13:18 +00:00
..
AliasAnalysis.cpp
[AliasAnalysis/NewPassManager] Invalidate AAManager less often.
2019-04-30 22:15:47 +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
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] Look through bitcasts in calcZeroHeuristic
2019-02-15 11:50:21 +00:00
CallGraph.cpp
[CallSite removal] Move the legacy PM, call graph, and some inliner
2019-04-19 05:59:42 +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
[CaptureTracking] Don't let comparisons against null escape inbounds pointers
2019-06-09 10:20:33 +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
[CFLGraph] Add support for unary fneg instruction.
2019-06-06 19:21:23 +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
[IDF] Generalize IDFCalculator to be used with Clang's CFG
2019-07-02 11:30:12 +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
Analysis: Don't look through aliases when simplifying GEPs.
2019-07-22 22:13:46 +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] Add an option to control delinearization validity checks
2019-06-06 15:12:49 +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
Add "const" in GetUnderlyingObjects. NFC
2019-04-24 06:55:50 +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
[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] Rename SimplifyFPUnOp and SimplifyFPBinOp
2019-07-24 12:50:10 +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
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
Introduce Value::stripPointerCastsSameRepresentation
2019-06-04 20:21:46 +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
[Lint] Permit aliasing noalias readonly arguments
2019-04-23 23:43:47 +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
OpaquePtr: add Type parameter to Loads analysis API.
2019-07-09 11:35:35 +00:00
LoopAccessAnalysis.cpp
[LAA] Re-check bit-width of pointers after stripping.
2019-07-18 17:30:27 +00:00
LoopAnalysisManager.cpp
Only passes that preserve MemorySSA must mark it as preserved.
2019-06-11 18:27:49 +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
OpaquePtr: switch to GlobalValue::getValueType in a few places. NFC.
2019-07-11 13:13:02 +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] Check that block is reachable when adding phis.
2019-05-02 23:41:58 +00:00
MemorySSAUpdater.cpp
[MemorySSA] Use SetVector to avoid nondeterminism.
2019-07-12 22:30:30 +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] Attempt to recommit r365188 after alignment fix
2019-07-05 15:25:05 +00:00
MustExecute.cpp
[MustExecute] Improve MustExecute to correctly handle loop nest
2019-05-27 13:57:28 +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
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
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
[SCEV] add no wrap flag for SCEVAddExpr.
2019-07-18 09:23:19 +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
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
[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
Initial support for IBM MASS vector library
2019-06-05 01:31:43 +00:00
TargetTransformInfo.cpp
[AMDGPU] Tune inlining parameters for AMDGPU target
2019-07-17 16:51:29 +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
Basic codegen for MTE stack tagging.
2019-07-17 19:24:02 +00:00
VectorUtils.cpp
[Scalarizer] Add scalarizer support for smul.fix.sat
2019-06-24 12:07:11 +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))

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