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[SCCP] Mark CFG as preserved.

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SCCP does not change the CFG, so we can mark it as preserved.

Reviewers: dberlin, efriedma, davide

Reviewed By: davide

Differential Revision: https://reviews.llvm.org/D47149

llvm-svn: 335820
This commit is contained in:
Florian Hahn 2018-06-28 09:53:38 +00:00
parent 4472e68d7c
commit d55c362426
5 changed files with 38 additions and 6 deletions
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2
lib/Transforms/Scalar/SCCP.cpp
View File

@ -1777,6 +1777,7 @@ PreservedAnalyses SCCPPass::run(Function &F, FunctionAnalysisManager &AM) {
auto PA = PreservedAnalyses();
PA.preserve<GlobalsAA>();
PA.preserveSet<CFGAnalyses>();
return PA;
}
@ -1799,6 +1800,7 @@ public:
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<TargetLibraryInfoWrapperPass>();
AU.addPreserved<GlobalsAAWrapperPass>();
AU.setPreservesCFG();
}
// runOnFunction - Run the Sparse Conditional Constant Propagation

2
test/Other/opt-O2-pipeline.ll
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@ -132,10 +132,8 @@
; CHECK-NEXT: Memory Dependence Analysis
; CHECK-NEXT: MemCpy Optimization
; CHECK-NEXT: Sparse Conditional Constant Propagation
; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Demanded bits analysis
; CHECK-NEXT: Bit-Tracking Dead Code Elimination
; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
; CHECK-NEXT: Function Alias Analysis Results
; CHECK-NEXT: Natural Loop Information
; CHECK-NEXT: Lazy Branch Probability Analysis

2
test/Other/opt-O3-pipeline.ll
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@ -136,10 +136,8 @@
; CHECK-NEXT: Memory Dependence Analysis
; CHECK-NEXT: MemCpy Optimization
; CHECK-NEXT: Sparse Conditional Constant Propagation
; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Demanded bits analysis
; CHECK-NEXT: Bit-Tracking Dead Code Elimination
; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
; CHECK-NEXT: Function Alias Analysis Results
; CHECK-NEXT: Natural Loop Information
; CHECK-NEXT: Lazy Branch Probability Analysis

2
test/Other/opt-Os-pipeline.ll
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@ -118,10 +118,8 @@
; CHECK-NEXT: Memory Dependence Analysis
; CHECK-NEXT: MemCpy Optimization
; CHECK-NEXT: Sparse Conditional Constant Propagation
; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Demanded bits analysis
; CHECK-NEXT: Bit-Tracking Dead Code Elimination
; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
; CHECK-NEXT: Function Alias Analysis Results
; CHECK-NEXT: Natural Loop Information
; CHECK-NEXT: Lazy Branch Probability Analysis

36
test/Transforms/SCCP/preserve-analysis.ll Normal file
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@ -0,0 +1,36 @@
; RUN: opt < %s -debug-pass=Structure -globals-aa -loop-vectorize -sccp -loop-vectorize -globals-aa 2>&1 -S | FileCheck %s
; RUN: opt < %s -debug-pass-manager -passes='loop-vectorize,sccp,loop-vectorize' 2>&1 -S | FileCheck --check-prefix=NEW-PM %s
; Check CFG-only analysis are preserved by SCCP by running it between 2
; loop-vectorize runs.
; CHECK: Globals Alias Analysis
; CHECK: Dominator Tree Construction
; CHECK: Natural Loop Information
; CHECK: Basic Alias Analysis (stateless AA impl)
; CHECK: Sparse Conditional Constant Propagation
; CHECK-NOT: Dominator Tree Construction
; CHECK-NOT: Natural Loop Information
; CHECK-NOT: Basic Alias Analysis (stateless AA impl)
; CHECK-NOT: Globals Alias Analysis
; CHECK: Loop Vectorization
; NEW-PM-DAG: Running analysis: LoopAnalysis on test
; NEW-PM-DAG: Running analysis: DominatorTreeAnalysis on test
; NEW-PM-DAG: Running analysis: AssumptionAnalysis on test
; NEW-PM-DAG: Running analysis: TargetLibraryAnalysis on test
; NEW-PM-DAG: Running analysis: TargetIRAnalysis on test
; NEW-PM: Running pass: SCCPPass on test
; NEW-PM-NOT: Running analysis: LoopAnalysis on test
; NEW-PM-NOT: Running analysis: DominatorTreeAnalysis on test
; NEW-PM-NOT: Running analysis: AssumptionAnalysis on test
; NEW-PM-NOT: Running analysis: TargetLibraryAnalysis on test
; NEW-PM-NOT: Running analysis: TargetIRAnalysis on test
; NEW-PM: Finished llvm::Function pass manager run.
define i32 @test() {
entry:
%res = add i32 1, 10
ret i32 %res
}