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1241b83d61
Summary:
SpeculativeExecution enables a series straight line optimizations (such
as SLSR and NaryReassociate) on conditional code. For example,
if (...)
... b * s ...
if (...)
... (b + 1) * s ...
speculative execution can hoist b * s and (b + 1) * s from then-blocks,
so that we have
... b * s ...
if (...)
...
... (b + 1) * s ...
if (...)
...
Then, SLSR can rewrite (b + 1) * s to (b * s + s) because after
speculative execution b * s dominates (b + 1) * s.
The performance impact of this change is significant. It speeds up the
benchmarks running EigenFloatContractionKernelInternal16x16
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|---|---|---|
| .. | ||
| ADCE | ||
| AddDiscriminators | ||
| AlignmentFromAssumptions | ||
| ArgumentPromotion | ||
| AtomicExpand/ARM | ||
| BBVectorize | ||
| BDCE | ||
| BranchFolding | ||
| CodeExtractor | ||
| CodeGenPrepare | ||
| ConstantHoisting | ||
| ConstantMerge | ||
| ConstProp | ||
| CorrelatedValuePropagation | ||
| DeadArgElim | ||
| DeadStoreElimination | ||
| EarlyCSE | ||
| EliminateAvailableExternally | ||
| Float2Int | ||
| FunctionAttrs | ||
| GCOVProfiling | ||
| GlobalDCE | ||
| GlobalOpt | ||
| GVN | ||
| IndVarSimplify | ||
| Inline | ||
| InstCombine | ||
| InstMerge | ||
| InstSimplify | ||
| Internalize | ||
| IPConstantProp | ||
| IRCE | ||
| JumpThreading | ||
| LCSSA | ||
| LICM | ||
| LoadCombine | ||
| LoopDeletion | ||
| LoopDistribute | ||
| LoopIdiom | ||
| LoopInterchange | ||
| LoopReroll | ||
| LoopRotate | ||
| LoopSimplify | ||
| LoopStrengthReduce | ||
| LoopUnroll | ||
| LoopUnswitch | ||
| LoopVectorize | ||
| LowerAtomic | ||
| LowerBitSets | ||
| LowerExpectIntrinsic | ||
| LowerInvoke | ||
| LowerSwitch | ||
| Mem2Reg | ||
| MemCpyOpt | ||
| MergeFunc | ||
| MetaRenamer | ||
| NaryReassociate | ||
| ObjCARC | ||
| PartiallyInlineLibCalls | ||
| PhaseOrdering | ||
| PlaceSafepoints | ||
| PruneEH | ||
| Reassociate | ||
| Reg2Mem | ||
| RewriteStatepointsForGC | ||
| SafeStack | ||
| SampleProfile | ||
| Scalarizer | ||
| ScalarRepl | ||
| SCCP | ||
| SeparateConstOffsetFromGEP | ||
| SimplifyCFG | ||
| Sink | ||
| SLPVectorizer | ||
| SpeculativeExecution | ||
| SROA | ||
| StraightLineStrengthReduce | ||
| StripSymbols | ||
| StructurizeCFG | ||
| TailCallElim | ||
| TailDup | ||
| Util | ||