forked from OSchip/llvm-project
ed9df5bd2f
Hoisting and sinking instructions out of conditional blocks enables additional vectorization by: 1. Executing memory accesses unconditionally. 2. Reducing the number of instructions that need predication. After disabling early hoisting / sinking, we miss out on a few vectorization opportunities. One of those is causing a ~10% performance regression in one of the Geekbench benchmarks on AArch64. This patch tires to recover the regression by running hoisting/sinking as part of a SimplifyCFG run after LoopRotate and before LoopVectorize. Note that in the legacy pass-manager, we run LoopRotate just before vectorization again and there's no SimplifyCFG run in between, so the sinking/hoisting may impact the later run on LoopRotate. But the impact should be limited and the benefit of hosting/sinking at this stage should outweigh the risk of not rotating. Compile-time impact looks slightly positive for most cases. http://llvm-compile-time-tracker.com/compare.php?from=2ea7fb7b1c045a7d60fcccf3df3ebb26aa3699e5&to=e58b4a763c691da651f25996aad619cb3d946faf&stat=instructions NewPM-O3: geomean -0.19% NewPM-ReleaseThinLTO: geoman -0.54% NewPM-ReleaseLTO-g: geomean -0.03% With a few benchmarks seeing a notable increase, but also some improvements. Alternative to D101290. Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D101468 |
||
|---|---|---|
| .. | ||
| AlwaysInliner.cpp | ||
| Annotation2Metadata.cpp | ||
| ArgumentPromotion.cpp | ||
| Attributor.cpp | ||
| AttributorAttributes.cpp | ||
| BarrierNoopPass.cpp | ||
| BlockExtractor.cpp | ||
| CMakeLists.txt | ||
| CalledValuePropagation.cpp | ||
| ConstantMerge.cpp | ||
| CrossDSOCFI.cpp | ||
| DeadArgumentElimination.cpp | ||
| ElimAvailExtern.cpp | ||
| ExtractGV.cpp | ||
| ForceFunctionAttrs.cpp | ||
| FunctionAttrs.cpp | ||
| FunctionImport.cpp | ||
| GlobalDCE.cpp | ||
| GlobalOpt.cpp | ||
| GlobalSplit.cpp | ||
| HotColdSplitting.cpp | ||
| IPO.cpp | ||
| IROutliner.cpp | ||
| InferFunctionAttrs.cpp | ||
| InlineSimple.cpp | ||
| Inliner.cpp | ||
| Internalize.cpp | ||
| LoopExtractor.cpp | ||
| LowerTypeTests.cpp | ||
| MergeFunctions.cpp | ||
| OpenMPOpt.cpp | ||
| PartialInlining.cpp | ||
| PassManagerBuilder.cpp | ||
| PruneEH.cpp | ||
| SCCP.cpp | ||
| SampleContextTracker.cpp | ||
| SampleProfile.cpp | ||
| SampleProfileProbe.cpp | ||
| StripDeadPrototypes.cpp | ||
| StripSymbols.cpp | ||
| SyntheticCountsPropagation.cpp | ||
| ThinLTOBitcodeWriter.cpp | ||
| WholeProgramDevirt.cpp | ||