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f4beb75be0
This recommit r317351 after fixing a buildbot failure.
Original commit message:
Summary:
This change add a pass which tries to split a call-site to pass
more constrained arguments if its argument is predicated in the control flow
so that we can expose better context to the later passes (e.g, inliner, jump
threading, or IPA-CP based function cloning, etc.).
As of now we support two cases :
1) If a call site is dominated by an OR condition and if any of its arguments
are predicated on this OR condition, try to split the condition with more
constrained arguments. For example, in the code below, we try to split the
call site since we can predicate the argument (ptr) based on the OR condition.
Split from :
if (!ptr || c)
callee(ptr);
to :
if (!ptr)
callee(null ptr) // set the known constant value
else if (c)
callee(nonnull ptr) // set non-null attribute in the argument
2) We can also split a call-site based on constant incoming values of a PHI
For example,
from :
BB0:
%c = icmp eq i32 %i1, %i2
br i1 %c, label %BB2, label %BB1
BB1:
br label %BB2
BB2:
%p = phi i32 [ 0, %BB0 ], [ 1, %BB1 ]
call void @bar(i32 %p)
to
BB0:
%c = icmp eq i32 %i1, %i2
br i1 %c, label %BB2-split0, label %BB1
BB1:
br label %BB2-split1
BB2-split0:
call void @bar(i32 0)
br label %BB2
BB2-split1:
call void @bar(i32 1)
br label %BB2
BB2:
%p = phi i32 [ 0, %BB2-split0 ], [ 1, %BB2-split1 ]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317362 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
5.8 KiB
LLVM
119 lines
5.8 KiB
LLVM
; Basic test for the new LTO pipeline.
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; For now the only difference is between -O1 and everything else, so
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; -O2, -O3, -Os, -Oz are the same.
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='lto<O1>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O1
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='lto<O2>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O2
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='lto<O3>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O2
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='lto<Os>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O2
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='lto<Oz>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O2
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='lto<O3>' -S %s -passes-ep-peephole='no-op-function' 2>&1 \
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; RUN: | FileCheck %s --check-prefix=CHECK-O --check-prefix=CHECK-O2 \
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; RUN: --check-prefix=CHECK-EP-Peephole
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; CHECK-O: Starting llvm::Module pass manager run.
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; CHECK-O-NEXT: Running pass: PassManager<{{.*}}Module
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; CHECK-O-NEXT: Starting llvm::Module pass manager run.
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; CHECK-O-NEXT: Running pass: GlobalDCEPass
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; CHECK-O-NEXT: Running pass: ForceFunctionAttrsPass
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; CHECK-O-NEXT: Running pass: InferFunctionAttrsPass
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; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
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; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-O2-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}Module
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; CHECK-O2-NEXT: Starting llvm::Function pass manager run.
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; CHECK-O2-NEXT: Running pass: CallSiteSplittingPass on foo
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; CHECK-O2-NEXT: Running analysis: TargetLibraryAnalysis on foo
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; CHECK-O2-NEXT: Finished llvm::Function pass manager run.
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; CHECK-O2-NEXT: PGOIndirectCallPromotion
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; CHECK-O2-NEXT: Running analysis: ProfileSummaryAnalysis
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; CHECK-O2-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis
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; CHECK-O2-NEXT: Running pass: IPSCCPPass
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; CHECK-O2-NEXT: Running pass: CalledValuePropagationPass
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; CHECK-O-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}PostOrderFunctionAttrsPass>
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; CHECK-O-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}SCC
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; CHECK-O1-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}Function
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; CHECK-O-NEXT: Running analysis: LazyCallGraphAnalysis
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; CHECK-O-NEXT: Running analysis: FunctionAnalysisManagerCGSCCProxy
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; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy<{{.*}}LazyCallGraph{{.*}}>
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; CHECK-O-NEXT: Running analysis: AAManager
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; CHECK-O1-NEXT: Running analysis: TargetLibraryAnalysis
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; CHECK-O-NEXT: Running pass: ReversePostOrderFunctionAttrsPass
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; CHECK-O-NEXT: Running analysis: CallGraphAnalysis
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; CHECK-O-NEXT: Running pass: GlobalSplitPass
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; CHECK-O-NEXT: Running pass: WholeProgramDevirtPass
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; CHECK-O2-NEXT: Running pass: GlobalOptPass
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; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PromotePass>
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; CHECK-O2-NEXT: Running analysis: DominatorTreeAnalysis
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; CHECK-O2-NEXT: Running analysis: AssumptionAnalysis
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; CHECK-O2-NEXT: Running pass: ConstantMergePass
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; CHECK-O2-NEXT: Running pass: DeadArgumentEliminationPass
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; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-O2-NEXT: Starting llvm::Function pass manager run.
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; CHECK-O2-NEXT: Running pass: InstCombinePass
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; CHECK-EP-Peephole-NEXT: Running pass: NoOpFunctionPass
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; CHECK-O2-NEXT: Finished llvm::Function pass manager run.
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; CHECK-O2-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}InlinerPass>
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; CHECK-O2-NEXT: Running pass: GlobalOptPass
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; CHECK-O2-NEXT: Running pass: GlobalDCEPass
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; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-O2-NEXT: Starting llvm::Function pass manager run.
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; CHECK-O2-NEXT: Running pass: InstCombinePass
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; CHECK-EP-Peephole-NEXT: Running pass: NoOpFunctionPass
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; CHECK-O2-NEXT: Running pass: JumpThreadingPass
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; CHECK-O2-NEXT: Running analysis: LazyValueAnalysis
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; CHECK-O2-NEXT: Running pass: SROA on foo
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; CHECK-O2-NEXT: Finished llvm::Function pass manager run.
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; CHECK-O2-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}PostOrderFunctionAttrsPass>
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; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-O2-NEXT: Running analysis: MemoryDependenceAnalysis
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; CHECK-O2-NEXT: Running analysis: TargetIRAnalysis
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; CHECK-O2-NEXT: Running analysis: DemandedBitsAnalysis
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; CHECK-O2-NEXT: Running pass: CrossDSOCFIPass
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; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}SimplifyCFGPass>
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; CHECK-O2-NEXT: Running pass: EliminateAvailableExternallyPass
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; CHECK-O2-NEXT: Running pass: GlobalDCEPass
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; CHECK-O-NEXT: Finished llvm::Module pass manager run.
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; CHECK-O-NEXT: Running pass: PrintModulePass
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; Make sure we get the IR back out without changes when we print the module.
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; CHECK-O-LABEL: define void @foo(i32 %n) local_unnamed_addr {
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; CHECK-O-NEXT: entry:
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; CHECK-O-NEXT: br label %loop
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; CHECK-O: loop:
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; CHECK-O-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
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; CHECK-O-NEXT: %iv.next = add i32 %iv, 1
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; CHECK-O-NEXT: tail call void @bar()
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; CHECK-O-NEXT: %cmp = icmp eq i32 %iv, %n
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; CHECK-O-NEXT: br i1 %cmp, label %exit, label %loop
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; CHECK-O: exit:
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; CHECK-O-NEXT: ret void
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; CHECK-O-NEXT: }
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;
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; CHECK-O-NEXT: Finished llvm::Module pass manager run.
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declare void @bar() local_unnamed_addr
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define void @foo(i32 %n) local_unnamed_addr {
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entry:
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
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%iv.next = add i32 %iv, 1
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tail call void @bar()
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%cmp = icmp eq i32 %iv, %n
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br i1 %cmp, label %exit, label %loop
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exit:
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ret void
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}
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