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f48207fec4
When multiple loop transformation are defined in a loop's metadata, their order of execution is defined by the order of their respective passes in the pass pipeline. For instance, e.g.
#pragma clang loop unroll_and_jam(enable)
#pragma clang loop distribute(enable)
is the same as
#pragma clang loop distribute(enable)
#pragma clang loop unroll_and_jam(enable)
and will try to loop-distribute before Unroll-And-Jam because the LoopDistribute pass is scheduled after UnrollAndJam pass. UnrollAndJamPass only supports one inner loop, i.e. it will necessarily fail after loop distribution. It is not possible to specify another execution order. Also,t the order of passes in the pipeline is subject to change between versions of LLVM, optimization options and which pass manager is used.
This patch adds 'followup' attributes to various loop transformation passes. These attributes define which attributes the resulting loop of a transformation should have. For instance,
!0 = !{!0, !1, !2}
!1 = !{!"llvm.loop.unroll_and_jam.enable"}
!2 = !{!"llvm.loop.unroll_and_jam.followup_inner", !3}
!3 = !{!"llvm.loop.distribute.enable"}
defines a loop ID (!0) to be unrolled-and-jammed (!1) and then the attribute !3 to be added to the jammed inner loop, which contains the instruction to distribute the inner loop.
Currently, in both pass managers, pass execution is in a fixed order and UnrollAndJamPass will not execute again after LoopDistribute. We hope to fix this in the future by allowing pass managers to run passes until a fixpoint is reached, use Polly to perform these transformations, or add a loop transformation pass which takes the order issue into account.
For mandatory/forced transformations (e.g. by having been declared by #pragma omp simd), the user must be notified when a transformation could not be performed. It is not possible that the responsible pass emits such a warning because the transformation might be 'hidden' in a followup attribute when it is executed, or it is not present in the pipeline at all. For this reason, this patche introduces a WarnMissedTransformations pass, to warn about orphaned transformations.
Since this changes the user-visible diagnostic message when a transformation is applied, two test cases in the clang repository need to be updated.
To ensure that no other transformation is executed before the intended one, the attribute `llvm.loop.disable_nonforced` can be added which should disable transformation heuristics before the intended transformation is applied. E.g. it would be surprising if a loop is distributed before a #pragma unroll_and_jam is applied.
With more supported code transformations (loop fusion, interchange, stripmining, offloading, etc.), transformations can be used as building blocks for more complex transformations (e.g. stripmining+stripmining+interchange -> tiling).
Reviewed By: hfinkel, dmgreen
Differential Revision: https://reviews.llvm.org/D49281
Differential Revision: https://reviews.llvm.org/D55288
llvm-svn: 348944
280 lines
15 KiB
LLVM
280 lines
15 KiB
LLVM
; The IR below was crafted so as:
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; 1) To have a loop, so we create a loop pass manager
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; 2) To be "immutable" in the sense that no pass in the standard
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; pipeline will modify it.
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; Since no transformations take place, we don't expect any analyses
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; to be invalidated.
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; Any invalidation that shows up here is a bug, unless we started modifying
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; the IR, in which case we need to make it immutable harder.
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;
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; Prelink pipelines:
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto-pre-link<O1>,name-anon-globals' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O1,CHECK-PRELINK-O,CHECK-PRELINK-O-NODIS,CHECK-PRELINK-O1
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto-pre-link<O2>,name-anon-globals' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O2,CHECK-PRELINK-O,CHECK-PRELINK-O-NODIS,CHECK-PRELINK-O2
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto-pre-link<O3>,name-anon-globals' -S -passes-ep-pipeline-start='no-op-module' %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O3,CHECK-PRELINK-O,CHECK-PRELINK-O-NODIS,CHECK-PRELINK-O3,CHECK-EP-PIPELINE-START
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto-pre-link<Os>,name-anon-globals' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-Os,CHECK-PRELINK-O,CHECK-PRELINK-O-NODIS,CHECK-PRELINK-Os
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto-pre-link<Oz>,name-anon-globals' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-Oz,CHECK-PRELINK-O,CHECK-PRELINK-O-NODIS,CHECK-PRELINK-Oz
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; RUN: opt -disable-verify -debug-pass-manager -new-pm-debug-info-for-profiling \
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; RUN: -passes='thinlto-pre-link<O2>,name-anon-globals' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-DIS,CHECK-O,CHECK-O2,CHECK-PRELINK-O,CHECK-PRELINK-O2
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; Enabling the hot-cold-split pass should not affect the ThinLTO pre-link
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto-pre-link<O2>,name-anon-globals' -hot-cold-split -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O2,CHECK-PRELINK-O,CHECK-PRELINK-O-NODIS,CHECK-PRELINK-O2
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;
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; Postlink pipelines:
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto<O1>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O1,CHECK-POSTLINK-O,CHECK-POSTLINK-O1
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto<O2>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O2,CHECK-POSTLINK-O,CHECK-POSTLINK-O2
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; RUN: opt -disable-verify -debug-pass-manager -passes-ep-pipeline-start='no-op-module' \
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; RUN: -passes='thinlto<O3>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O3,CHECK-POSTLINK-O,CHECK-POSTLINK-O3
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto<Os>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-Os,CHECK-POSTLINK-O,CHECK-POSTLINK-Os
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; RUN: opt -disable-verify -debug-pass-manager \
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; RUN: -passes='thinlto<Oz>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-Oz,CHECK-POSTLINK-O,CHECK-POSTLINK-Oz
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; RUN: opt -disable-verify -debug-pass-manager -new-pm-debug-info-for-profiling \
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; RUN: -passes='thinlto<O2>' -S %s 2>&1 \
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; RUN: | FileCheck %s --check-prefixes=CHECK-O,CHECK-O2,CHECK-POSTLINK-O,CHECK-POSTLINK-O2
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;
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; CHECK-O: Running analysis: PassInstrumentationAnalysis
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; CHECK-O-NEXT: 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: ForceFunctionAttrsPass
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; CHECK-EP-PIPELINE-START-NEXT: Running pass: NoOpModulePass
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; CHECK-DIS-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}AddDiscriminatorsPass{{.*}}>
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; CHECK-DIS-NEXT: Running analysis: InnerAnalysisManagerProxy
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; CHECK-POSTLINK-O-NEXT: Running pass: PGOIndirectCallPromotion
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; CHECK-POSTLINK-O-NEXT: Running analysis: ProfileSummaryAnalysis
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; CHECK-POSTLINK-O-NEXT: Running analysis: InnerAnalysisManagerProxy
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; CHECK-POSTLINK-O-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis
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; CHECK-POSTLINK-O-NEXT: Running analysis: PassInstrumentationAnalysis
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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: InferFunctionAttrsPass
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; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
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; CHECK-O-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-PRELINK-O-NODIS-NEXT: Running analysis: InnerAnalysisManagerProxy
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; CHECK-PRELINK-O-NEXT: Running analysis: PassInstrumentationAnalysis
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; CHECK-O-NEXT: Starting llvm::Function pass manager run.
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; CHECK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-O-NEXT: Running analysis: TargetIRAnalysis
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; CHECK-O-NEXT: Running analysis: AssumptionAnalysis
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; CHECK-O-NEXT: Running pass: SROA
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; CHECK-O-NEXT: Running analysis: DominatorTreeAnalysis
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; CHECK-O-NEXT: Running pass: EarlyCSEPass
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; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
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; CHECK-O-NEXT: Running pass: LowerExpectIntrinsicPass
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; CHECK-O3-NEXT: Running pass: CallSiteSplittingPass
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; CHECK-O-NEXT: Finished llvm::Function pass manager run.
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; CHECK-O-NEXT: Running pass: IPSCCPPass
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; CHECK-O-NEXT: Running pass: CalledValuePropagationPass
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; CHECK-O-NEXT: Running pass: GlobalOptPass
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; CHECK-O-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PromotePass>
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; CHECK-O-NEXT: Running pass: DeadArgumentEliminationPass
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; CHECK-O-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-O-NEXT: Starting llvm::Function pass manager run.
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; CHECK-O-NEXT: Running pass: InstCombinePass
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; CHECK-PRELINK-O-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis
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; CHECK-O-NEXT: Running analysis: AAManager
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; CHECK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-O-NEXT: Finished llvm::Function pass manager run.
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; CHECK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}GlobalsAA
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; CHECK-O-NEXT: Running analysis: GlobalsAA
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; CHECK-O-NEXT: Running analysis: CallGraphAnalysis
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; CHECK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}ProfileSummaryAnalysis
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; CHECK-PRELINK-O-NEXT: Running analysis: ProfileSummaryAnalysis
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; CHECK-O-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}LazyCallGraph{{.*}}>
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; CHECK-O-NEXT: Running analysis: InnerAnalysisManagerProxy
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; CHECK-O-NEXT: Running analysis: LazyCallGraphAnalysis
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; CHECK-O-NEXT: Running analysis: PassInstrumentationAnalysis
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; CHECK-O-NEXT: Starting CGSCC pass manager run.
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; CHECK-O-NEXT: Running pass: InlinerPass
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; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy<{{.*}}LazyCallGraph{{.*}}>
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; CHECK-O-NEXT: Running analysis: FunctionAnalysisManagerCGSCCProxy
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; CHECK-O-NEXT: Running pass: PostOrderFunctionAttrsPass
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; CHECK-O3-NEXT: Running pass: ArgumentPromotionPass
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; CHECK-O-NEXT: Running pass: CGSCCToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-O-NEXT: Starting llvm::Function pass manager run.
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; CHECK-O-NEXT: Running pass: SROA
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; CHECK-O-NEXT: Running pass: EarlyCSEPass
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; CHECK-O-NEXT: Running analysis: MemorySSAAnalysis
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; CHECK-O-NEXT: Running pass: SpeculativeExecutionPass
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; CHECK-O-NEXT: Running pass: JumpThreadingPass
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; CHECK-O-NEXT: Running analysis: LazyValueAnalysis
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; CHECK-O-NEXT: Running pass: CorrelatedValuePropagationPass
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; CHECK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-O3-NEXT: Running pass: AggressiveInstCombinePass
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; CHECK-O-NEXT: Running pass: InstCombinePass
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; CHECK-O1-NEXT: Running pass: LibCallsShrinkWrapPass
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; CHECK-O2-NEXT: Running pass: LibCallsShrinkWrapPass
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; CHECK-O3-NEXT: Running pass: LibCallsShrinkWrapPass
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; CHECK-O-NEXT: Running pass: TailCallElimPass
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; CHECK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-O-NEXT: Running pass: ReassociatePass
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; CHECK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}OptimizationRemarkEmitterAnalysis
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; CHECK-O-NEXT: Running pass: FunctionToLoopPassAdaptor<{{.*}}LoopStandardAnalysisResults{{.*}}>
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; CHECK-O-NEXT: Starting llvm::Function pass manager run
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; CHECK-O-NEXT: Running pass: LoopSimplifyPass
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; CHECK-O-NEXT: Running analysis: LoopAnalysis
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; CHECK-O-NEXT: Running pass: LCSSAPass
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; CHECK-O-NEXT: Finished llvm::Function pass manager run
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; CHECK-O-NEXT: Running analysis: ScalarEvolutionAnalysis
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; CHECK-O-NEXT: Running analysis: InnerAnalysisManagerProxy
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; CHECK-O-NEXT: Starting Loop pass manager run.
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; CHECK-O-NEXT: Running analysis: PassInstrumentationAnalysis
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; CHECK-O-NEXT: Running pass: LoopInstSimplifyPass
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; CHECK-O-NEXT: Running pass: LoopSimplifyCFGPass
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; CHECK-O-NEXT: Running pass: LoopRotatePass
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; CHECK-O-NEXT: Running pass: LICM
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; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy
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; CHECK-O-NEXT: Running pass: SimpleLoopUnswitchPass
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; CHECK-O-NEXT: Finished Loop pass manager run.
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; CHECK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-O-NEXT: Running pass: InstCombinePass
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; CHECK-O-NEXT: Running pass: FunctionToLoopPassAdaptor<{{.*}}LoopStandardAnalysisResults{{.*}}>
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; CHECK-O-NEXT: Starting llvm::Function pass manager run
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; CHECK-O-NEXT: Running pass: LoopSimplifyPass
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; CHECK-O-NEXT: Running pass: LCSSAPass
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; CHECK-O-NEXT: Finished llvm::Function pass manager run
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; CHECK-O-NEXT: Starting Loop pass manager run.
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; CHECK-O-NEXT: Running pass: IndVarSimplifyPass
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; CHECK-O-NEXT: Running pass: LoopIdiomRecognizePass
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; CHECK-O-NEXT: Running pass: LoopDeletionPass
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; CHECK-O-NEXT: Running pass: LoopFullUnrollPass
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; CHECK-O-NEXT: Finished Loop pass manager run.
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; CHECK-Os-NEXT: Running pass: MergedLoadStoreMotionPass
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; CHECK-Os-NEXT: Running pass: GVN
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; CHECK-Os-NEXT: Running analysis: MemoryDependenceAnalysis
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; CHECK-Os-NEXT: Running analysis: PhiValuesAnalysis
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; CHECK-Oz-NEXT: Running pass: MergedLoadStoreMotionPass
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; CHECK-Oz-NEXT: Running pass: GVN
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; CHECK-Oz-NEXT: Running analysis: MemoryDependenceAnalysis
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; CHECK-Oz-NEXT: Running analysis: PhiValuesAnalysis
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; CHECK-O2-NEXT: Running pass: MergedLoadStoreMotionPass
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; CHECK-O2-NEXT: Running pass: GVN
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; CHECK-O2-NEXT: Running analysis: MemoryDependenceAnalysis
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; CHECK-O2-NEXT: Running analysis: PhiValuesAnalysis
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; CHECK-O3-NEXT: Running pass: MergedLoadStoreMotionPass
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; CHECK-O3-NEXT: Running pass: GVN
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; CHECK-O3-NEXT: Running analysis: MemoryDependenceAnalysis
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; CHECK-O3-NEXT: Running analysis: PhiValuesAnalysis
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; CHECK-O-NEXT: Running pass: MemCpyOptPass
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; CHECK-O1-NEXT: Running analysis: MemoryDependenceAnalysis
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; CHECK-O1-NEXT: Running analysis: PhiValuesAnalysis
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; CHECK-O-NEXT: Running pass: SCCPPass
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; CHECK-O-NEXT: Running pass: BDCEPass
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; CHECK-O-NEXT: Running analysis: DemandedBitsAnalysis
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; CHECK-O-NEXT: Running pass: InstCombinePass
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; CHECK-O-NEXT: Running pass: JumpThreadingPass
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; CHECK-O-NEXT: Running pass: CorrelatedValuePropagationPass
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; CHECK-O-NEXT: Running pass: DSEPass
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; CHECK-O-NEXT: Running pass: FunctionToLoopPassAdaptor<{{.*}}LICMPass{{.*}}>
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; CHECK-O-NEXT: Starting llvm::Function pass manager run
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; CHECK-O-NEXT: Running pass: LoopSimplifyPass
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; CHECK-O-NEXT: Running pass: LCSSAPass
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; CHECK-O-NEXT: Finished llvm::Function pass manager run
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; CHECK-O-NEXT: Running pass: ADCEPass
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; CHECK-O-NEXT: Running analysis: PostDominatorTreeAnalysis
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; CHECK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-O-NEXT: Running pass: InstCombinePass
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; CHECK-O-NEXT: Finished llvm::Function pass manager run.
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; CHECK-O-NEXT: Finished CGSCC pass manager run.
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; CHECK-O-NEXT: Finished llvm::Module pass manager run.
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; CHECK-PRELINK-O-NEXT: Running pass: GlobalOptPass
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; CHECK-POSTLINK-O-NEXT: Running pass: PassManager<{{.*}}Module{{.*}}>
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; CHECK-POSTLINK-O-NEXT: Starting llvm::Module pass manager run.
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; CHECK-POSTLINK-O-NEXT: Running pass: GlobalOptPass
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; CHECK-POSTLINK-O-NEXT: Running pass: GlobalDCEPass
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; CHECK-POSTLINK-O-NEXT: Running pass: EliminateAvailableExternallyPass
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; CHECK-POSTLINK-O-NEXT: Running pass: ReversePostOrderFunctionAttrsPass
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; CHECK-POSTLINK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}GlobalsAA
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; CHECK-POSTLINK-O-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
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; CHECK-POSTLINK-O-NEXT: Starting llvm::Function pass manager run.
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; CHECK-POSTLINK-O-NEXT: Running pass: Float2IntPass
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; CHECK-POSTLINK-O-NEXT: Running pass: FunctionToLoopPassAdaptor<{{.*}}LoopRotatePass
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; CHECK-POSTLINK-O-NEXT: Starting llvm::Function pass manager run
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopSimplifyPass
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; CHECK-POSTLINK-O-NEXT: Running pass: LCSSAPass
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; CHECK-POSTLINK-O-NEXT: Finished llvm::Function pass manager run
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopDistributePass
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopVectorizePass
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; CHECK-POSTLINK-O-NEXT: Running analysis: BlockFrequencyAnalysis
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; CHECK-POSTLINK-O-NEXT: Running analysis: BranchProbabilityAnalysis
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopLoadEliminationPass
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; CHECK-POSTLINK-O-NEXT: Running analysis: LoopAccessAnalysis
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; CHECK-POSTLINK-O-NEXT: Running pass: InstCombinePass
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; CHECK-POSTLINK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-POSTLINK-O-NEXT: Running pass: SLPVectorizerPass
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; CHECK-POSTLINK-O-NEXT: Running pass: InstCombinePass
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopUnrollPass
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; CHECK-POSTLINK-O-NEXT: Running analysis: OuterAnalysisManagerProxy
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; CHECK-POSTLINK-O-NEXT: Running pass: WarnMissedTransformationsPass
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; CHECK-POSTLINK-O-NEXT: Running pass: InstCombinePass
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; CHECK-POSTLINK-O-NEXT: Running pass: RequireAnalysisPass<{{.*}}OptimizationRemarkEmitterAnalysis
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; CHECK-POSTLINK-O-NEXT: Running pass: FunctionToLoopPassAdaptor<{{.*}}LICMPass
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; CHECK-POSTLINK-O-NEXT: Starting llvm::Function pass manager run
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopSimplifyPass
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; CHECK-POSTLINK-O-NEXT: Running pass: LCSSAPass
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; CHECK-POSTLINK-O-NEXT: Finished llvm::Function pass manager run
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; CHECK-POSTLINK-O-NEXT: Running pass: AlignmentFromAssumptionsPass
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; CHECK-POSTLINK-O-NEXT: Running pass: LoopSinkPass
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; CHECK-POSTLINK-O-NEXT: Running pass: InstSimplifyPass
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; CHECK-POSTLINK-O-NEXT: Running pass: DivRemPairsPass
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; CHECK-POSTLINK-O-NEXT: Running pass: SimplifyCFGPass
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; CHECK-POSTLINK-O-NEXT: Running pass: SpeculateAroundPHIsPass
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; CHECK-POSTLINK-O-NEXT: Finished llvm::Function pass manager run.
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; CHECK-POSTLINK-O-NEXT: Running pass: CGProfilePass
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; CHECK-POSTLINK-O-NEXT: Running pass: GlobalDCEPass
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; CHECK-POSTLINK-O-NEXT: Running pass: ConstantMergePass
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; CHECK-POSTLINK-O-NEXT: Finished llvm::Module pass manager run.
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; CHECK-O-NEXT: Finished llvm::Module pass manager run.
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; CHECK-PRELINK-O-NEXT: Running pass: NameAnonGlobalPass
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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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