[lld] 74e4694 - [LTO] enable `ObjCARCContractPass` only on optimized build (#101114)
via llvm-commits
llvm-commits at lists.llvm.org
Fri Aug 9 13:04:31 PDT 2024
Author: Peter Rong
Date: 2024-08-09T13:04:25-07:00
New Revision: 74e4694b8cbdb918abd4645e2c5027359904fb92
URL: https://github.com/llvm/llvm-project/commit/74e4694b8cbdb918abd4645e2c5027359904fb92
DIFF: https://github.com/llvm/llvm-project/commit/74e4694b8cbdb918abd4645e2c5027359904fb92.diff
LOG: [LTO] enable `ObjCARCContractPass` only on optimized build (#101114)
\#92331 tried to make `ObjCARCContractPass` by default, but it caused a
regression on O0 builds and was reverted.
This patch trys to bring that back by:
1. reverts the
[revert](https://github.com/llvm/llvm-project/commit/1579e9ca9ce17364963861517fecf13b00fe4d8a).
2. `createObjCARCContractPass` only on optimized builds.
Tests are updated to refelect the changes. Specifically, all `O0` tests
should not include `ObjCARCContractPass`
Signed-off-by: Peter Rong <PeterRong at meta.com>
Added:
clang/test/CodeGen/thinlto-distributed-objc-contract-pass.ll
Modified:
clang/lib/CodeGen/BackendUtil.cpp
lld/MachO/LTO.cpp
llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h
llvm/lib/CodeGen/TargetPassConfig.cpp
llvm/lib/LTO/LTOCodeGenerator.cpp
llvm/lib/LTO/ThinLTOCodeGenerator.cpp
llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp
llvm/test/CodeGen/AArch64/O3-pipeline.ll
llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
llvm/test/CodeGen/ARM/O3-pipeline.ll
llvm/test/CodeGen/LoongArch/opt-pipeline.ll
llvm/test/CodeGen/M68k/pipeline.ll
llvm/test/CodeGen/PowerPC/O3-pipeline.ll
llvm/test/CodeGen/RISCV/O3-pipeline.ll
llvm/test/CodeGen/X86/opt-pipeline.ll
Removed:
################################################################################
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index e765bbf637a661..81e6702d5de666 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -588,12 +588,6 @@ bool EmitAssemblyHelper::AddEmitPasses(legacy::PassManager &CodeGenPasses,
// this also adds codegenerator level optimization passes.
CodeGenFileType CGFT = getCodeGenFileType(Action);
- // Add ObjC ARC final-cleanup optimizations. This is done as part of the
- // "codegen" passes so that it isn't run multiple times when there is
- // inlining happening.
- if (CodeGenOpts.OptimizationLevel > 0)
- CodeGenPasses.add(createObjCARCContractPass());
-
if (TM->addPassesToEmitFile(CodeGenPasses, OS, DwoOS, CGFT,
/*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
Diags.Report(diag::err_fe_unable_to_interface_with_target);
diff --git a/clang/test/CodeGen/thinlto-distributed-objc-contract-pass.ll b/clang/test/CodeGen/thinlto-distributed-objc-contract-pass.ll
new file mode 100644
index 00000000000000..e0256da314306c
--- /dev/null
+++ b/clang/test/CodeGen/thinlto-distributed-objc-contract-pass.ll
@@ -0,0 +1,19 @@
+; RUN: opt -thinlto-bc -o %t.o %s
+
+; RUN: llvm-lto2 run -thinlto-distributed-indexes %t.o \
+; RUN: -o %t2.index \
+; RUN: -r=%t.o,_use_arc,px
+
+; RUN: %clang_cc1 -O2 -triple x86_64-apple-darwin \
+; RUN: -emit-obj -fthinlto-index=%t.o.thinlto.bc \
+; RUN: -o %t.native.o -x ir %t.o
+
+target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-darwin"
+
+define void @use_arc(ptr %a, ptr %b) {
+ call void (...) @llvm.objc.clang.arc.use(ptr %a, ptr %b) nounwind
+ ret void
+}
+
+declare void @llvm.objc.clang.arc.use(...) nounwind
diff --git a/lld/MachO/LTO.cpp b/lld/MachO/LTO.cpp
index 7a9a9223a03227..6527cbb68f2498 100644
--- a/lld/MachO/LTO.cpp
+++ b/lld/MachO/LTO.cpp
@@ -48,9 +48,6 @@ static lto::Config createConfig() {
c.CPU = getCPUStr();
c.MAttrs = getMAttrs();
c.DiagHandler = diagnosticHandler;
- c.PreCodeGenPassesHook = [](legacy::PassManager &pm) {
- pm.add(createObjCARCContractPass());
- };
c.AlwaysEmitRegularLTOObj = !config->ltoObjPath.empty();
diff --git a/llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h b/llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h
index ccf859922e1634..5ac6ad47f7799c 100644
--- a/llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h
+++ b/llvm/include/llvm/Analysis/ObjCARCAnalysisUtils.h
@@ -41,26 +41,26 @@ extern bool EnableARCOpts;
/// Test if the given module looks interesting to run ARC optimization
/// on.
inline bool ModuleHasARC(const Module &M) {
- return
- M.getNamedValue("llvm.objc.retain") ||
- M.getNamedValue("llvm.objc.release") ||
- M.getNamedValue("llvm.objc.autorelease") ||
- M.getNamedValue("llvm.objc.retainAutoreleasedReturnValue") ||
- M.getNamedValue("llvm.objc.unsafeClaimAutoreleasedReturnValue") ||
- M.getNamedValue("llvm.objc.retainBlock") ||
- M.getNamedValue("llvm.objc.autoreleaseReturnValue") ||
- M.getNamedValue("llvm.objc.autoreleasePoolPush") ||
- M.getNamedValue("llvm.objc.loadWeakRetained") ||
- M.getNamedValue("llvm.objc.loadWeak") ||
- M.getNamedValue("llvm.objc.destroyWeak") ||
- M.getNamedValue("llvm.objc.storeWeak") ||
- M.getNamedValue("llvm.objc.initWeak") ||
- M.getNamedValue("llvm.objc.moveWeak") ||
- M.getNamedValue("llvm.objc.copyWeak") ||
- M.getNamedValue("llvm.objc.retainedObject") ||
- M.getNamedValue("llvm.objc.unretainedObject") ||
- M.getNamedValue("llvm.objc.unretainedPointer") ||
- M.getNamedValue("llvm.objc.clang.arc.use");
+ return M.getNamedValue("llvm.objc.retain") ||
+ M.getNamedValue("llvm.objc.release") ||
+ M.getNamedValue("llvm.objc.autorelease") ||
+ M.getNamedValue("llvm.objc.retainAutoreleasedReturnValue") ||
+ M.getNamedValue("llvm.objc.unsafeClaimAutoreleasedReturnValue") ||
+ M.getNamedValue("llvm.objc.retainBlock") ||
+ M.getNamedValue("llvm.objc.autoreleaseReturnValue") ||
+ M.getNamedValue("llvm.objc.autoreleasePoolPush") ||
+ M.getNamedValue("llvm.objc.loadWeakRetained") ||
+ M.getNamedValue("llvm.objc.loadWeak") ||
+ M.getNamedValue("llvm.objc.destroyWeak") ||
+ M.getNamedValue("llvm.objc.storeWeak") ||
+ M.getNamedValue("llvm.objc.initWeak") ||
+ M.getNamedValue("llvm.objc.moveWeak") ||
+ M.getNamedValue("llvm.objc.copyWeak") ||
+ M.getNamedValue("llvm.objc.retainedObject") ||
+ M.getNamedValue("llvm.objc.unretainedObject") ||
+ M.getNamedValue("llvm.objc.unretainedPointer") ||
+ M.getNamedValue("llvm.objc.clang.arc.noop.use") ||
+ M.getNamedValue("llvm.objc.clang.arc.use");
}
/// This is a wrapper around getUnderlyingObject which also knows how to
diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
index 3a20b340d45f28..79e240d62a17d7 100644
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -46,6 +46,7 @@
#include "llvm/Support/WithColor.h"
#include "llvm/Target/CGPassBuilderOption.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Transforms/ObjCARC.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils.h"
#include <cassert>
@@ -943,6 +944,9 @@ void TargetPassConfig::addCodeGenPrepare() {
void TargetPassConfig::addISelPrepare() {
addPreISel();
+ if (getOptLevel() != CodeGenOptLevel::None)
+ addPass(createObjCARCContractPass());
+
// Force codegen to run according to the callgraph.
if (requiresCodeGenSCCOrder())
addPass(new DummyCGSCCPass);
diff --git a/llvm/lib/LTO/LTOCodeGenerator.cpp b/llvm/lib/LTO/LTOCodeGenerator.cpp
index 34aacb660144f4..a192392e045851 100644
--- a/llvm/lib/LTO/LTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/LTOCodeGenerator.cpp
@@ -136,10 +136,6 @@ LTOCodeGenerator::LTOCodeGenerator(LLVMContext &Context)
Config.CodeModel = std::nullopt;
Config.StatsFile = LTOStatsFile;
- Config.PreCodeGenPassesHook = [](legacy::PassManager &PM) {
- PM.add(createObjCARCContractPass());
- };
-
Config.RunCSIRInstr = LTORunCSIRInstr;
Config.CSIRProfile = LTOCSIRProfile;
}
diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
index 57c94e1988b796..b982df7c6e5d3f 100644
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -335,10 +335,6 @@ std::unique_ptr<MemoryBuffer> codegenModule(Module &TheModule,
raw_svector_ostream OS(OutputBuffer);
legacy::PassManager PM;
- // If the bitcode files contain ARC code and were compiled with optimization,
- // the ObjCARCContractPass must be run, so do it unconditionally here.
- PM.add(createObjCARCContractPass());
-
// Setup the codegen now.
if (TM.addPassesToEmitFile(PM, OS, nullptr, CodeGenFileType::ObjectFile,
/* DisableVerify */ true))
diff --git a/llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp b/llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp
index 0d0f5c72928ab7..e0f43e31288a30 100644
--- a/llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp
+++ b/llvm/lib/Transforms/ObjCARC/ObjCARCContract.cpp
@@ -31,6 +31,7 @@
#include "ProvenanceAnalysis.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/ObjCARCUtil.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/EHPersonalities.h"
@@ -71,6 +72,9 @@ class ObjCARCContract {
ARCRuntimeEntryPoints EP;
BundledRetainClaimRVs *BundledInsts = nullptr;
+ /// A flag indicating whether this optimization pass should run.
+ bool Run;
+
/// The inline asm string to insert between calls and RetainRV calls to make
/// the optimization work on targets which need it.
const MDString *RVInstMarker;
@@ -527,6 +531,10 @@ bool ObjCARCContract::tryToPeepholeInstruction(
//===----------------------------------------------------------------------===//
bool ObjCARCContract::init(Module &M) {
+ Run = ModuleHasARC(M);
+ if (!Run)
+ return false;
+
EP.init(&M);
// Initialize RVInstMarker.
@@ -536,6 +544,9 @@ bool ObjCARCContract::init(Module &M) {
}
bool ObjCARCContract::run(Function &F, AAResults *A, DominatorTree *D) {
+ if (!Run)
+ return false;
+
if (!EnableARCOpts)
return false;
@@ -730,6 +741,9 @@ INITIALIZE_PASS_END(ObjCARCContractLegacyPass, "objc-arc-contract",
void ObjCARCContractLegacyPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<AAResultsWrapperPass>();
AU.addRequired<DominatorTreeWrapperPass>();
+ AU.addPreserved<AAResultsWrapperPass>();
+ AU.addPreserved<BasicAAWrapperPass>();
+ AU.addPreserved<DominatorTreeWrapperPass>();
}
Pass *llvm::createObjCARCContractPass() {
diff --git a/llvm/test/CodeGen/AArch64/O3-pipeline.ll b/llvm/test/CodeGen/AArch64/O3-pipeline.ll
index 845634e8e98302..72a888bde5ebbc 100644
--- a/llvm/test/CodeGen/AArch64/O3-pipeline.ll
+++ b/llvm/test/CodeGen/AArch64/O3-pipeline.ll
@@ -102,11 +102,14 @@
; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: FunctionPass Manager
; CHECK-NEXT: Merge internal globals
+; CHECK-NEXT: Dominator Tree Construction
+; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
+; CHECK-NEXT: Function Alias Analysis Results
+; CHECK-NEXT: ObjC ARC contraction
; CHECK-NEXT: Prepare callbr
; CHECK-NEXT: Safe Stack instrumentation pass
; CHECK-NEXT: Insert stack protectors
; CHECK-NEXT: Module Verifier
-; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
; CHECK-NEXT: Function Alias Analysis Results
; CHECK-NEXT: Natural Loop Information
diff --git a/llvm/test/CodeGen/AMDGPU/llc-pipeline.ll b/llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
index ee7f9375bf5df9..c896bfe925ed81 100644
--- a/llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
+++ b/llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
@@ -279,6 +279,9 @@
; GCN-O1-NEXT: AMDGPU Rewrite Undef for PHI
; GCN-O1-NEXT: LCSSA Verifier
; GCN-O1-NEXT: Loop-Closed SSA Form Pass
+; GCN-O1-NEXT: Basic Alias Analysis (stateless AA impl)
+; GCN-O1-NEXT: Function Alias Analysis Results
+; GCN-O1-NEXT: ObjC ARC contraction
; GCN-O1-NEXT: DummyCGSCCPass
; GCN-O1-NEXT: FunctionPass Manager
; GCN-O1-NEXT: Prepare callbr
@@ -571,6 +574,9 @@
; GCN-O1-OPTS-NEXT: AMDGPU Rewrite Undef for PHI
; GCN-O1-OPTS-NEXT: LCSSA Verifier
; GCN-O1-OPTS-NEXT: Loop-Closed SSA Form Pass
+; GCN-O1-OPTS-NEXT: Basic Alias Analysis (stateless AA impl)
+; GCN-O1-OPTS-NEXT: Function Alias Analysis Results
+; GCN-O1-OPTS-NEXT: ObjC ARC contraction
; GCN-O1-OPTS-NEXT: DummyCGSCCPass
; GCN-O1-OPTS-NEXT: FunctionPass Manager
; GCN-O1-OPTS-NEXT: Prepare callbr
@@ -876,6 +882,11 @@
; GCN-O2-NEXT: LCSSA Verifier
; GCN-O2-NEXT: Loop-Closed SSA Form Pass
; GCN-O2-NEXT: Analysis if a function is memory bound
+; GCN-O2-NEXT: FunctionPass Manager
+; GCN-O2-NEXT: Dominator Tree Construction
+; GCN-O2-NEXT: Basic Alias Analysis (stateless AA impl)
+; GCN-O2-NEXT: Function Alias Analysis Results
+; GCN-O2-NEXT: ObjC ARC contraction
; GCN-O2-NEXT: DummyCGSCCPass
; GCN-O2-NEXT: FunctionPass Manager
; GCN-O2-NEXT: Prepare callbr
@@ -1194,6 +1205,11 @@
; GCN-O3-NEXT: LCSSA Verifier
; GCN-O3-NEXT: Loop-Closed SSA Form Pass
; GCN-O3-NEXT: Analysis if a function is memory bound
+; GCN-O3-NEXT: FunctionPass Manager
+; GCN-O3-NEXT: Dominator Tree Construction
+; GCN-O3-NEXT: Basic Alias Analysis (stateless AA impl)
+; GCN-O3-NEXT: Function Alias Analysis Results
+; GCN-O3-NEXT: ObjC ARC contraction
; GCN-O3-NEXT: DummyCGSCCPass
; GCN-O3-NEXT: FunctionPass Manager
; GCN-O3-NEXT: Prepare callbr
diff --git a/llvm/test/CodeGen/ARM/O3-pipeline.ll b/llvm/test/CodeGen/ARM/O3-pipeline.ll
index e74e4f2ad3893a..9b983d96f79330 100644
--- a/llvm/test/CodeGen/ARM/O3-pipeline.ll
+++ b/llvm/test/CodeGen/ARM/O3-pipeline.ll
@@ -64,11 +64,14 @@
; CHECK-NEXT: Transform predicated vector loops to use MVE tail predication
; CHECK-NEXT: A No-Op Barrier Pass
; CHECK-NEXT: FunctionPass Manager
+; CHECK-NEXT: Dominator Tree Construction
+; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
+; CHECK-NEXT: Function Alias Analysis Results
+; CHECK-NEXT: ObjC ARC contraction
; CHECK-NEXT: Prepare callbr
; CHECK-NEXT: Safe Stack instrumentation pass
; CHECK-NEXT: Insert stack protectors
; CHECK-NEXT: Module Verifier
-; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
; CHECK-NEXT: Function Alias Analysis Results
; CHECK-NEXT: Natural Loop Information
diff --git a/llvm/test/CodeGen/LoongArch/opt-pipeline.ll b/llvm/test/CodeGen/LoongArch/opt-pipeline.ll
index e07a334888c189..50f154663177d0 100644
--- a/llvm/test/CodeGen/LoongArch/opt-pipeline.ll
+++ b/llvm/test/CodeGen/LoongArch/opt-pipeline.ll
@@ -70,6 +70,9 @@
; LAXX-NEXT: CodeGen Prepare
; LAXX-NEXT: Dominator Tree Construction
; LAXX-NEXT: Exception handling preparation
+; LAXX-NEXT: Basic Alias Analysis (stateless AA impl)
+; LAXX-NEXT: Function Alias Analysis Results
+; LAXX-NEXT: ObjC ARC contraction
; LAXX-NEXT: Prepare callbr
; LAXX-NEXT: Safe Stack instrumentation pass
; LAXX-NEXT: Insert stack protectors
diff --git a/llvm/test/CodeGen/M68k/pipeline.ll b/llvm/test/CodeGen/M68k/pipeline.ll
index 6aa66d09aa78bc..76d72f5a50420e 100644
--- a/llvm/test/CodeGen/M68k/pipeline.ll
+++ b/llvm/test/CodeGen/M68k/pipeline.ll
@@ -40,6 +40,9 @@
; CHECK-NEXT: CodeGen Prepare
; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Exception handling preparation
+; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
+; CHECK-NEXT: Function Alias Analysis Results
+; CHECK-NEXT: ObjC ARC contraction
; CHECK-NEXT: Prepare callbr
; CHECK-NEXT: Safe Stack instrumentation pass
; CHECK-NEXT: Insert stack protectors
diff --git a/llvm/test/CodeGen/PowerPC/O3-pipeline.ll b/llvm/test/CodeGen/PowerPC/O3-pipeline.ll
index f4f492782eb653..60d42704ca795a 100644
--- a/llvm/test/CodeGen/PowerPC/O3-pipeline.ll
+++ b/llvm/test/CodeGen/PowerPC/O3-pipeline.ll
@@ -81,6 +81,9 @@
; CHECK-NEXT: Lazy Block Frequency Analysis
; CHECK-NEXT: Optimization Remark Emitter
; CHECK-NEXT: Hardware Loop Insertion
+; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
+; CHECK-NEXT: Function Alias Analysis Results
+; CHECK-NEXT: ObjC ARC contraction
; CHECK-NEXT: Prepare callbr
; CHECK-NEXT: Safe Stack instrumentation pass
; CHECK-NEXT: Insert stack protectors
diff --git a/llvm/test/CodeGen/RISCV/O3-pipeline.ll b/llvm/test/CodeGen/RISCV/O3-pipeline.ll
index eaaf86731351ab..df9cb5de5d7682 100644
--- a/llvm/test/CodeGen/RISCV/O3-pipeline.ll
+++ b/llvm/test/CodeGen/RISCV/O3-pipeline.ll
@@ -73,11 +73,14 @@
; CHECK-NEXT: Exception handling preparation
; CHECK-NEXT: A No-Op Barrier Pass
; CHECK-NEXT: FunctionPass Manager
+; CHECK-NEXT: Dominator Tree Construction
+; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
+; CHECK-NEXT: Function Alias Analysis Results
+; CHECK-NEXT: ObjC ARC contraction
; CHECK-NEXT: Prepare callbr
; CHECK-NEXT: Safe Stack instrumentation pass
; CHECK-NEXT: Insert stack protectors
; CHECK-NEXT: Module Verifier
-; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
; CHECK-NEXT: Function Alias Analysis Results
; CHECK-NEXT: Natural Loop Information
@@ -194,7 +197,7 @@
; CHECK-NEXT: Machine Optimization Remark Emitter
; CHECK-NEXT: Stack Frame Layout Analysis
; CHECK-NEXT: RISC-V Zcmp move merging pass
-; CHECK-NEXT: RISC-V Zcmp Push/Pop optimization pass
+; CHECK-NEXT: RISC-V Zcmp Push/Pop optimization pass
; CHECK-NEXT: RISC-V Indirect Branch Tracking
; CHECK-NEXT: RISC-V pseudo instruction expansion pass
; CHECK-NEXT: RISC-V atomic pseudo instruction expansion pass
diff --git a/llvm/test/CodeGen/X86/opt-pipeline.ll b/llvm/test/CodeGen/X86/opt-pipeline.ll
index 6fcc1ed068f433..12c16a03b134c8 100644
--- a/llvm/test/CodeGen/X86/opt-pipeline.ll
+++ b/llvm/test/CodeGen/X86/opt-pipeline.ll
@@ -71,6 +71,9 @@
; CHECK-NEXT: CodeGen Prepare
; CHECK-NEXT: Dominator Tree Construction
; CHECK-NEXT: Exception handling preparation
+; CHECK-NEXT: Basic Alias Analysis (stateless AA impl)
+; CHECK-NEXT: Function Alias Analysis Results
+; CHECK-NEXT: ObjC ARC contraction
; CHECK-NEXT: Prepare callbr
; CHECK-NEXT: Safe Stack instrumentation pass
; CHECK-NEXT: Insert stack protectors
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