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710443d7ab
The tests have been updated and I plan to move them from the MSSA directory up. Some end-to-end tests needed small adjustments. One difference to the legacy DSE is that legacy DSE also deletes trivially dead instructions that are unrelated to memory operations. Because MemorySSA-backed DSE just walks the MemorySSA, we only visit/check memory instructions. But removing unrelated dead instructions is not really DSE's job and other passes will clean up. One noteworthy change is in llvm/test/Transforms/Coroutines/ArgAddr.ll, but I think this comes down to legacy DSE not handling instructions that may throw correctly in that case. To cover this with MemorySSA-backed DSE, we need an update to llvm.coro.begin to treat it's return value to belong to the same underlying object as the passed pointer. There are some minor cases MemorySSA-backed DSE currently misses, e.g. related to atomic operations, but I think those can be implemented after the switch. This has been discussed on llvm-dev: http://lists.llvm.org/pipermail/llvm-dev/2020-August/144417.html For the MultiSource/SPEC2000/SPEC2006 the number of eliminated stores goes from ~17500 (legayc DSE) to ~26300 (MemorySSA-backed). More numbers and details in the thread on llvm-dev. Impact on CTMark: ``` Legacy Pass Manager exec instrs size-text O3 + 0.60% - 0.27% ReleaseThinLTO + 1.00% - 0.42% ReleaseLTO-g. + 0.77% - 0.33% RelThinLTO (link only) + 0.87% - 0.42% RelLO-g (link only) + 0.78% - 0.33% ``` http://llvm-compile-time-tracker.com/compare.php?from=3f22e96d95c71ded906c67067d75278efb0a2525&to=ae8be4642533ff03803967ee9d7017c0d73b0ee0&stat=instructions ``` New Pass Manager exec instrs. size-text O3 + 0.95% - 0.25% ReleaseThinLTO + 1.34% - 0.41% ReleaseLTO-g. + 1.71% - 0.35% RelThinLTO (link only) + 0.96% - 0.41% RelLO-g (link only) + 2.21% - 0.35% ``` http://195.201.131.214:8000/compare.php?from=3f22e96d95c71ded906c67067d75278efb0a2525&to=ae8be4642533ff03803967ee9d7017c0d73b0ee0&stat=instructions Reviewed By: asbirlea, xbolva00, nikic Differential Revision: https://reviews.llvm.org/D87163 |
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| .. | ||
| AliasSet | ||
| AssumptionCache | ||
| BasicAA | ||
| BlockFrequencyInfo | ||
| BranchProbabilityInfo | ||
| CallGraph | ||
| CFLAliasAnalysis | ||
| CostModel | ||
| DDG | ||
| Delinearization | ||
| DemandedBits | ||
| DependenceAnalysis | ||
| DivergenceAnalysis | ||
| DominanceFrontier | ||
| Dominators | ||
| FunctionPropertiesAnalysis | ||
| GlobalsModRef | ||
| IVUsers | ||
| LazyCallGraph | ||
| LazyValueAnalysis | ||
| LegacyDivergenceAnalysis | ||
| Lint | ||
| LoopAccessAnalysis | ||
| LoopCacheAnalysis/PowerPC | ||
| LoopInfo | ||
| LoopNestAnalysis | ||
| MemoryDependenceAnalysis | ||
| MemorySSA | ||
| MustExecute | ||
| PhiValues | ||
| PostDominators | ||
| ProfileSummary | ||
| RegionInfo | ||
| ScalarEvolution | ||
| ScopedNoAliasAA | ||
| StackSafetyAnalysis | ||
| TypeBasedAliasAnalysis | ||
| ValueTracking | ||
| alias-analysis-uses.ll | ||