Eli Friedman bd0f067b12 [JumpThreading] Fix exponential time algorithm computing known values. ...

ComputeValueKnownInPredecessors has a "visited" set to prevent infinite
loops, since a value can be visited more than once.  However, the
implementation didn't prevent the algorithm from taking exponential
time. Instead of removing elements from the RecursionSet one at a time,
we should keep around the whole set until
ComputeValueKnownInPredecessors finishes, then discard it.

The testcase is synthetic because I was having trouble effectively
reducing the original.  But it's basically the same idea.

Instead of failing, we could theoretically cache the result instead.
But I don't think it would help substantially in practice.

Differential Revision: https://reviews.llvm.org/D54239



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346562 91177308-0d34-0410-b5e6-96231b3b80d8

2018-11-09 22:35:26 +00:00

..

ADCE.cpp

[TI removal] Make variables declared as TerminatorInst and initialized

2018-10-15 10:04:59 +00:00

AlignmentFromAssumptions.cpp

Remove trailing space

2018-07-30 19:41:25 +00:00

BDCE.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

CallSiteSplitting.cpp

Revert r346483: [CallSiteSplitting] Only record conditions up to the IDom(call site).

2018-11-09 13:28:58 +00:00

CMakeLists.txt

[UnrollAndJam] New Unroll and Jam pass

2018-07-01 12:47:30 +00:00

ConstantHoisting.cpp

Revert "Revert "[ConstHoist] Do not rebase single (or few) dependent constant""

2018-09-26 00:59:09 +00:00

ConstantProp.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

CorrelatedValuePropagation.cpp

[Dominators] Convert existing passes and utils to use the DomTreeUpdater class

2018-08-03 05:08:17 +00:00

DCE.cpp

[DCE] Add DebugCounter support

2018-09-13 20:29:50 +00:00

DeadStoreElimination.cpp

[TI removal] Make variables declared as TerminatorInst and initialized

2018-10-15 10:04:59 +00:00

DivRemPairs.cpp

Reland r338431: "Add DebugCounters to DivRemPairs"

2018-08-01 23:14:14 +00:00

EarlyCSE.cpp

[EarlyCSEwMemorySSA] Add MSSA verification and tests to make EarlyCSE failures easier to track.

2018-09-17 22:35:21 +00:00

FlattenCFGPass.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

Float2Int.cpp

Rename DEBUG macro to LLVM_DEBUG.

2018-05-14 12:53:11 +00:00

GuardWidening.cpp

llvm::sort(C.begin(), C.end(), ...) -> llvm::sort(C, ...)

2018-09-27 02:13:45 +00:00

GVN.cpp

[TI removal] Remove TerminatorInst from GVN.h and GVN.cpp.

2018-10-15 10:00:15 +00:00

GVNHoist.cpp

[TI removal] Make getTerminator() return a generic Instruction.

2018-10-15 10:42:50 +00:00

GVNSink.cpp

llvm::sort(C.begin(), C.end(), ...) -> llvm::sort(C, ...)

2018-09-27 02:13:45 +00:00

InductiveRangeCheckElimination.cpp

Remove trailing space

2018-07-30 19:41:25 +00:00

IndVarSimplify.cpp

Return "[IndVars] Smart hard uses detection"

2018-11-08 11:54:35 +00:00

InferAddressSpaces.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

InstSimplifyPass.cpp

[instsimplify] Move the instsimplify pass to use more obvious file names

2018-06-29 23:36:03 +00:00

IVUsersPrinter.cpp

[PM] Separate the LoopAnalysisManager from the LoopPassManager and move

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

JumpThreading.cpp

[JumpThreading] Fix exponential time algorithm computing known values.

2018-11-09 22:35:26 +00:00

LICM.cpp

[NFC] Add utility function for SafetyInfo updates for moveBefore

2018-11-09 05:39:04 +00:00

LLVMBuild.txt

Another try to commit 323321 (aggressive instruction combine).

2018-01-25 12:06:32 +00:00

LoopAccessAnalysisPrinter.cpp

[PM] Separate the LoopAnalysisManager from the LoopPassManager and move

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

LoopDataPrefetch.cpp

Rename DEBUG macro to LLVM_DEBUG.

2018-05-14 12:53:11 +00:00

LoopDeletion.cpp

Rename DEBUG macro to LLVM_DEBUG.

2018-05-14 12:53:11 +00:00

LoopDistribute.cpp

Rename DEBUG macro to LLVM_DEBUG.

2018-05-14 12:53:11 +00:00

LoopIdiomRecognize.cpp

[InstCombine] Cleanup libfunc attribute inferring

2018-10-16 21:18:31 +00:00

LoopInstSimplify.cpp

Update MemorySSA in LoopInstSimplify.

2018-08-22 20:05:21 +00:00

LoopInterchange.cpp

[LoopInterchange] Support reductions across inner and outer loop.

2018-11-08 20:44:19 +00:00

LoopLoadElimination.cpp

Use SmallPtrSet explicitly for SmallSets with pointer types (NFC).

2018-06-12 11:16:56 +00:00

LoopPassManager.cpp

[New PM] Introducing PassInstrumentation framework

2018-09-20 17:08:45 +00:00

LoopPredication.cpp

[LoopPredication] add some simple stats

2018-10-17 09:02:54 +00:00

LoopRerollPass.cpp

[LoopReroll] Rewrite induction variable rewriting.

2018-06-22 22:58:55 +00:00

LoopRotation.cpp

Update MemorySSA in LoopRotate.

2018-10-24 22:46:45 +00:00

LoopSimplifyCFG.cpp

[NFC] Reorganize code to prepare it for more transforms

2018-11-01 09:42:50 +00:00

LoopSink.cpp

[LoopSink] Do not sink instructions into non-cold blocks

2018-11-07 18:26:24 +00:00

LoopStrengthReduce.cpp

[LSR] Combine unfolded offset into invariant register

2018-11-08 09:01:19 +00:00

LoopUnrollAndJamPass.cpp

[UnJ] Improve explicit loop count checks

2018-08-11 07:37:31 +00:00

LoopUnrollPass.cpp

[LoopUnroll] allow customization for new-pass-manager version of LoopUnroll

2018-10-31 14:33:14 +00:00

LoopUnswitch.cpp

[NFC] Make LoopSafetyInfo abstract to allow alternative implementations

2018-10-16 08:31:05 +00:00

LoopVersioningLICM.cpp

Rename DEBUG macro to LLVM_DEBUG.

2018-05-14 12:53:11 +00:00

LowerAtomic.cpp

Remove redundant includes from lib/Transforms.

2017-12-13 21:31:01 +00:00

LowerExpectIntrinsic.cpp

Remove \brief commands from doxygen comments.

2018-05-01 15:54:18 +00:00

LowerGuardIntrinsic.cpp

Re-enable "[NFC] Unify guards detection"

2018-08-30 03:39:16 +00:00

MemCpyOptimizer.cpp

Merge clang's isRepeatedBytePattern with LLVM's isBytewiseValue

2018-09-21 05:17:42 +00:00

MergedLoadStoreMotion.cpp

[DebugInfo][InstMerge] Fix -debugify for phi node created by -mldst-motion

2018-11-02 18:25:41 +00:00

MergeICmps.cpp

[MergeICmps] Do not perform the transformation if GEP is used outside of block

2018-11-05 18:16:32 +00:00

NaryReassociate.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

NewGVN.cpp

[NewGVN] Make sure we do not add a user to itself.

2018-11-07 17:20:07 +00:00

PartiallyInlineLibCalls.cpp

[PartiallyInlineLibCalls] Add DebugCounter support

2018-09-13 20:33:04 +00:00

PlaceSafepoints.cpp

[TI removal] Make variables declared as TerminatorInst and initialized

2018-10-15 10:04:59 +00:00

Reassociate.cpp

[FPEnv] Convert more BinaryOperator::isFNeg(...) to m_FNeg(...)

2018-10-24 14:45:18 +00:00

Reg2Mem.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

RewriteStatepointsForGC.cpp

[TI removal] Make variables declared as TerminatorInst and initialized

2018-10-15 10:04:59 +00:00

Scalar.cpp

[LLVM-C][OCaml] Add UnifyFunctionExitNodes pass to C and OCaml APIs

2018-09-18 13:36:03 +00:00

Scalarizer.cpp

Fix an ordering bug in the scalarizer.

2018-10-10 09:27:45 +00:00

SCCP.cpp

[IPSCCP,PM] Preserve DT in the new pass manager.

2018-11-09 11:52:27 +00:00

SeparateConstOffsetFromGEP.cpp

[NFC] fix trivial typos in comments

2018-06-14 05:41:49 +00:00

SimpleLoopUnswitch.cpp

[SimpleLoopUnswitch] partial unswitch needs to be careful when replacing invariants with constants

2018-11-07 20:05:11 +00:00

SimplifyCFGPass.cpp

Move Analysis/Utils/Local.h back to Transforms

2018-06-04 21:23:21 +00:00

Sink.cpp

[IR] Replace isa<TerminatorInst> with isTerminator().

2018-08-26 09:51:22 +00:00

SpeculateAroundPHIs.cpp

fix comment typo

2018-08-27 14:25:22 +00:00

SpeculativeExecution.cpp

Use SmallPtrSet explicitly for SmallSets with pointer types (NFC).

2018-06-12 11:16:56 +00:00

SROA.cpp

[SROA] Use offset sizes from the DataLayout instead of the pointer siezes.

2018-10-30 11:15:04 +00:00

StraightLineStrengthReduce.cpp

[SLSR] use 'match' to simplify code; NFC

2018-10-23 14:07:39 +00:00

StructurizeCFG.cpp

StructurizeCFG: Simplify inserted PHI nodes

2018-10-17 15:37:41 +00:00

TailRecursionElimination.cpp

[TI removal] Make variables declared as TerminatorInst and initialized

2018-10-15 10:04:59 +00:00