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[LTO] Run Argument Promotion before IPSCCP #111163

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Merged
merged 1 commit into from
Oct 10, 2024
Merged

[LTO] Run Argument Promotion before IPSCCP #111163

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9 changes: 9 additions & 0 deletions llvm/lib/Passes/PassBuilderPipelines.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1831,6 +1831,15 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level,
MPM.addPass(PGOIndirectCallPromotion(
true /* InLTO */, PGOOpt && PGOOpt->Action == PGOOptions::SampleUse));

// Promoting by-reference arguments to by-value exposes more constants to
// IPSCCP.
MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(
PostOrderFunctionAttrsPass(/*SkipNonRecursive*/ true)));
MPM.addPass(
createModuleToPostOrderCGSCCPassAdaptor(ArgumentPromotionPass()));
MPM.addPass(
createModuleToFunctionPassAdaptor(SROAPass(SROAOptions::ModifyCFG)));

// Propagate constants at call sites into the functions they call. This
// opens opportunities for globalopt (and inlining) by substituting function
// pointers passed as arguments to direct uses of functions.
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9 changes: 6 additions & 3 deletions llvm/test/Other/new-pm-lto-defaults.ll
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Expand Up @@ -41,14 +41,17 @@
; CHECK-O23SZ-NEXT: PGOIndirectCallPromotion
; CHECK-O23SZ-NEXT: Running analysis: ProfileSummaryAnalysis
; CHECK-O23SZ-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis
; CHECK-O23SZ-NEXT: Running pass: IPSCCPPass
; CHECK-O23SZ-NEXT: Running analysis: AssumptionAnalysis on foo
; CHECK-O23SZ-NEXT: Running pass: CalledValuePropagationPass
; CHECK-O-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}SCC
; CHECK-O-NEXT: Running analysis: LazyCallGraphAnalysis
; CHECK-O1-NEXT: Running analysis: TargetLibraryAnalysis
; CHECK-O-NEXT: Running analysis: FunctionAnalysisManagerCGSCCProxy
; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy<{{.*}}LazyCallGraph{{.*}}>
; CHECK-O23SZ-NEXT: Running pass: PostOrderFunctionAttrsPass
; CHECK-O23SZ-NEXT: Running pass: ArgumentPromotionPass
; CHECK-O23SZ-NEXT: Running pass: SROAPass
; CHECK-O23SZ-NEXT: Running analysis: AssumptionAnalysis on foo
; CHECK-O23SZ-NEXT: Running pass: IPSCCPPass
; CHECK-O23SZ-NEXT: Running pass: CalledValuePropagationPass
; CHECK-O-NEXT: Running pass: PostOrderFunctionAttrsPass
; CHECK-O-NEXT: Running analysis: AAManager
; CHECK-O-NEXT: Running analysis: BasicAA
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