Roman Lebedev aadf55d1ce [NFC] EliminateDuplicatePHINodes(): small-size optimization: if there are <= 32 PHI's, O(n^2) algo is faster (geomean -0.08%) ...

This is functionally equivalent to the old implementation.

As per https://llvm-compile-time-tracker.com/compare.php?from=5f4e9bf6416e45eba483a4e5e263749989fdb3b3&to=4739e6e4eb54d3736e6457249c0919b30f6c855a&stat=instructions
this is a clear geomean compile-time regression-free win with overall geomean of `-0.08%`

32 PHI's appears to be the sweet spot; both the 16 and 64 performed worse:
https://llvm-compile-time-tracker.com/compare.php?from=5f4e9bf6416e45eba483a4e5e263749989fdb3b3&to=c4efe1fbbfdf0305ac26cd19eacb0c7774cdf60e&stat=instructions
https://llvm-compile-time-tracker.com/compare.php?from=5f4e9bf6416e45eba483a4e5e263749989fdb3b3&to=e4989d1c67010d3339d1a40ff5286a31f10cfe82&stat=instructions

If we have more PHI's than that, we fall-back to the original DenseSet-based implementation,
so the not-so-fast cases will still be handled.

However compile-time isn't the main motivation here.
I can name at least 3 limitations of this CSE:
1. Assumes that all PHI nodes have incoming basic blocks in the same order (can be fixed while keeping the DenseMap)
2. Does not special-handle `undef` incoming values (i don't see how we can do this with hashing)
3. Does not special-handle backedge incoming values (maybe can be fixed by hashing backedge as some magical value)

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D87408

2020-09-17 11:29:03 +03:00

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AddDiscriminators.cpp

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AMDGPUEmitPrintf.cpp

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ASanStackFrameLayout.cpp

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AssumeBundleBuilder.cpp

[NFC] Remove unused GetUnderlyingObject paramenter

2020-07-31 02:10:03 -07:00

BasicBlockUtils.cpp

[Loop Simplify] Resolve an issue where metadata is not applied to a loop latch.

2020-07-17 14:02:14 +00:00

BreakCriticalEdges.cpp

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BuildLibCalls.cpp

[BuildLibCalls] Add more noundef to library functions

2020-09-09 20:33:35 +09:00

BypassSlowDivision.cpp

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CallGraphUpdater.cpp

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CallPromotionUtils.cpp

[Utils] isLegalToPromote - Fix missing null check before writing to FailureReason.

2020-09-15 14:49:04 +01:00

CanonicalizeAliases.cpp

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CanonicalizeFreezeInLoops.cpp

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CloneFunction.cpp

[Cloning] Fix to cloning DISubprograms.

2020-08-21 11:54:56 -07:00

CloneModule.cpp

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CMakeLists.txt

[Loop Peeling] Separate the Loop Peeling Utilities from the Loop Unrolling Utilities

2020-07-31 18:31:58 +00:00

CodeExtractor.cpp

IR: Define byref parameter attribute

2020-07-20 10:23:09 -04:00

CodeMoverUtils.cpp

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CtorUtils.cpp

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Debugify.cpp

Revert rG5dd566b7c7b78bd- "PassManager.h - remove unnecessary Function.h/Module.h includes. NFCI."

2020-07-24 13:02:33 +01:00

DemoteRegToStack.cpp

Revert rG5dd566b7c7b78bd- "PassManager.h - remove unnecessary Function.h/Module.h includes. NFCI."

2020-07-24 13:02:33 +01:00

EntryExitInstrumenter.cpp

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EscapeEnumerator.cpp

[TSAN] Handle musttail call properly in EscapeEnumerator (and TSAN)

2020-09-15 15:20:05 -07:00

Evaluator.cpp

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FixIrreducible.cpp

[LowerSwitch][NewPM] Port lowerswitch to NPM

2020-09-15 18:18:31 -07:00

FlattenCFG.cpp

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FunctionComparator.cpp

[SVE] Make ElementCount members private

2020-08-28 14:43:53 +01:00

FunctionImportUtils.cpp

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GlobalStatus.cpp

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GuardUtils.cpp

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ImportedFunctionsInliningStatistics.cpp

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InjectTLIMappings.cpp

[InjectTLIMappings] Use StringRef instead of std::string for FN name.

2020-07-16 11:53:04 -07:00

InlineFunction.cpp

[SVE][CodeGen] Fix InlineFunction for scalable vectors

2020-09-11 08:34:51 +01:00

InstructionNamer.cpp

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IntegerDivision.cpp

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LCSSA.cpp

[LCSSA] Provide option for caller to clean up unused PHIs.

2020-08-01 20:43:19 +01:00

LibCallsShrinkWrap.cpp

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LLVMBuild.txt

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Local.cpp

[NFC] EliminateDuplicatePHINodes(): small-size optimization: if there are <= 32 PHI's, O(n^2) algo is faster (geomean -0.08%)

2020-09-17 11:29:03 +03:00

LoopPeel.cpp

[Loop Peeling] Separate the Loop Peeling Utilities from the Loop Unrolling Utilities

2020-07-31 18:31:58 +00:00

LoopRotationUtils.cpp

[NFC][LoopRotate] Add a statistic for how many times rotation failed due to the header size

2020-07-16 00:21:55 +03:00

LoopSimplify.cpp

[LoopSimplify] Use SmallPtrSet and range for loops more. NFCI.

2020-07-20 15:00:59 +02:00

LoopUnroll.cpp

[Loop Peeling] Separate the Loop Peeling Utilities from the Loop Unrolling Utilities

2020-07-31 18:31:58 +00:00

LoopUnrollAndJam.cpp

[NFC][LoopUnrollAndJam] Use BasicBlock::replacePhiUsesWith instead of

2020-08-11 15:35:14 +00:00

LoopUnrollRuntime.cpp

[LoopUnroll] Update branch weight for remainder loop

2020-07-15 12:33:29 -07:00

LoopUtils.cpp

[NFC] GetUnderlyingObject -> getUnderlyingObject

2020-07-30 21:08:24 -07:00

LoopVersioning.cpp

[BFI] Make BFI information available through loop passes inside LoopStandardAnalysisResults

2020-09-15 16:16:24 -07:00

LowerInvoke.cpp

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LowerMemIntrinsics.cpp

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LowerSwitch.cpp

[LowerSwitch][NewPM] Port lowerswitch to NPM

2020-09-15 18:18:31 -07:00

MatrixUtils.cpp

[Matrix] Add TileInfo abstraction for tiled matrix code-gen.

2020-07-20 18:49:08 +01:00

Mem2Reg.cpp

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MetaRenamer.cpp

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MisExpect.cpp

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ModuleUtils.cpp

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NameAnonGlobals.cpp

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PredicateInfo.cpp

[PredicateInfo][SCCP] Remove assertion (PR46814)

2020-07-23 19:36:51 +02:00

PromoteMemoryToRegister.cpp

[SROA][Mem2Reg] Use efficient droppable use API (after D83976)

2020-07-28 17:41:01 -05:00

SanitizerStats.cpp

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ScalarEvolutionExpander.cpp

[SCEV] Constant expansion cost at minsize

2020-09-10 08:21:11 +01:00

SimplifyCFG.cpp

[SimplifyCFG] Consider cost of combining predicates.

2020-09-07 10:04:50 +01:00

SimplifyIndVar.cpp

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SimplifyLibCalls.cpp

[InstCombine] fix bug in pow expansion

2020-09-15 09:29:48 -04:00

SizeOpts.cpp

Reland D84057 [PGO][PGSO] Remove a temporary flag used for gradual rollout.

2020-07-22 20:57:25 -07:00

SplitModule.cpp

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SSAUpdater.cpp

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SSAUpdaterBulk.cpp

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StripGCRelocates.cpp

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StripNonLineTableDebugInfo.cpp

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SymbolRewriter.cpp

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UnifyFunctionExitNodes.cpp

[UnifyFunctionExitNodes] Fix Modified status for unreachable blocks

2020-09-09 13:36:03 +02:00

UnifyLoopExits.cpp

[LowerSwitch][NewPM] Port lowerswitch to NPM

2020-09-15 18:18:31 -07:00

UniqueInternalLinkageNames.cpp

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Utils.cpp

[LowerSwitch][NewPM] Port lowerswitch to NPM

2020-09-15 18:18:31 -07:00

ValueMapper.cpp

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VNCoercion.cpp

[NFC] Remove unused GetUnderlyingObject paramenter

2020-07-31 02:10:03 -07:00