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Jay Foad 6c1703b074 [SDA] Don't stop divergence propagation at the IPD. 
Summary:
This fixes B42473 and B42706.

This patch makes the SDA propagate branch divergence until the end of the RPO traversal. Before, the SyncDependenceAnalysis propagated divergence only until the IPD in rpo order. RPO is incompatible with post dominance in the presence of loops. This made the SDA crash because blocks were missed in the propagation.

Reviewers: foad, nhaehnle

Reviewed By: foad

Subscribers: jvesely, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65274

llvm-svn: 372223
2019-09-18 13:40:22 +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/AST] Check if the AliasAny set is removed from the tracker.
2019-09-12 18:09:47 +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
Revert "Data Dependence Graph Basics"
2019-09-17 19:22:01 +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] Expand folding of some library functions
2019-09-12 21:23:22 +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 few tautological cases (PR43251)
2019-09-14 13:47:27 +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
[InstCombine] Annotate strdup with deref_or_null
2019-09-17 10:12:48 +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] Update MSSA for non-conventional AA.
2019-09-17 16:31:37 +00:00
MemorySSAUpdater.cpp
[MemorySSA] Fix phi insertion when inserting a def.
2019-09-17 16:33:35 +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
[SCEV] Add smin support to getRangeRef
2019-09-12 21:32:27 +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] Don't stop divergence propagation at the IPD.
2019-09-18 13:40:22 +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
[NFC] remove unused functions
2019-09-16 14:48:58 +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
InterleavedAccessInfo - Don't dereference a dyn_cast result. NFCI.
2019-09-17 13:25:56 +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))

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