[clang] f05ce90 - [NVPTX] Add NVPTXCtorDtorLoweringPass to handle global ctors / dtors
Joseph Huber via cfe-commits
cfe-commits at lists.llvm.org
Thu May 4 05:13:10 PDT 2023
Author: Joseph Huber
Date: 2023-05-04T07:13:00-05:00
New Revision: f05ce9045af4a40232c08451cb0aef64b0e673b2
URL: https://github.com/llvm/llvm-project/commit/f05ce9045af4a40232c08451cb0aef64b0e673b2
DIFF: https://github.com/llvm/llvm-project/commit/f05ce9045af4a40232c08451cb0aef64b0e673b2.diff
LOG: [NVPTX] Add NVPTXCtorDtorLoweringPass to handle global ctors / dtors
This patch mostly adapts the existing AMDGPUCtorDtorLoweringPass for use
by the Nvidia backend. This pass transforms the ctor / dtor list into a
kernel call that can be used to invoke those functinos. Furthermore, we
emit globals such that the names and addresses of these constructor
functions can be found by the driver. Unfortunately, since NVPTX has no
way to emit variables at a named section, nor a functioning linker to
provide the begin / end symbols, we need to mangle these names and have
an external application find them.
This work is related to the work in D149398 and D149340.
Reviewed By: tra
Differential Revision: https://reviews.llvm.org/D149451
Added:
llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.cpp
llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.h
llvm/test/CodeGen/NVPTX/lower-ctor-dtor.ll
Modified:
clang/lib/Driver/ToolChains/Cuda.cpp
clang/lib/Driver/ToolChains/Cuda.h
clang/test/Driver/cuda-cross-compiling.c
llvm/lib/Target/NVPTX/CMakeLists.txt
llvm/lib/Target/NVPTX/NVPTX.h
llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
Removed:
################################################################################
diff --git a/clang/lib/Driver/ToolChains/Cuda.cpp b/clang/lib/Driver/ToolChains/Cuda.cpp
index 8ff7807b54b73..c0fcdad861994 100644
--- a/clang/lib/Driver/ToolChains/Cuda.cpp
+++ b/clang/lib/Driver/ToolChains/Cuda.cpp
@@ -695,8 +695,9 @@ void NVPTX::getNVPTXTargetFeatures(const Driver &D, const llvm::Triple &Triple,
/// toolchain.
NVPTXToolChain::NVPTXToolChain(const Driver &D, const llvm::Triple &Triple,
const llvm::Triple &HostTriple,
- const ArgList &Args)
- : ToolChain(D, Triple, Args), CudaInstallation(D, HostTriple, Args) {
+ const ArgList &Args, bool Freestanding = false)
+ : ToolChain(D, Triple, Args), CudaInstallation(D, HostTriple, Args),
+ Freestanding(Freestanding) {
if (CudaInstallation.isValid()) {
CudaInstallation.WarnIfUnsupportedVersion();
getProgramPaths().push_back(std::string(CudaInstallation.getBinPath()));
@@ -711,7 +712,8 @@ NVPTXToolChain::NVPTXToolChain(const Driver &D, const llvm::Triple &Triple,
NVPTXToolChain::NVPTXToolChain(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args)
: NVPTXToolChain(D, Triple,
- llvm::Triple(llvm::sys::getDefaultTargetTriple()), Args) {}
+ llvm::Triple(llvm::sys::getDefaultTargetTriple()), Args,
+ /*Freestanding=*/true) {}
llvm::opt::DerivedArgList *
NVPTXToolChain::TranslateArgs(const llvm::opt::DerivedArgList &Args,
@@ -735,6 +737,16 @@ NVPTXToolChain::TranslateArgs(const llvm::opt::DerivedArgList &Args,
return DAL;
}
+void NVPTXToolChain::addClangTargetOptions(
+ const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args,
+ Action::OffloadKind DeviceOffloadingKind) const {
+ // If we are compiling with a standalone NVPTX toolchain we want to try to
+ // mimic a standard environment as much as possible. So we enable lowering
+ // ctor / dtor functions to global symbols that can be registered.
+ if (Freestanding)
+ CC1Args.append({"-mllvm", "--nvptx-lower-global-ctor-dtor"});
+}
+
bool NVPTXToolChain::supportsDebugInfoOption(const llvm::opt::Arg *A) const {
const Option &O = A->getOption();
return (O.matches(options::OPT_gN_Group) &&
diff --git a/clang/lib/Driver/ToolChains/Cuda.h b/clang/lib/Driver/ToolChains/Cuda.h
index 9cafbddbf7ca0..39df6e06fb26d 100644
--- a/clang/lib/Driver/ToolChains/Cuda.h
+++ b/clang/lib/Driver/ToolChains/Cuda.h
@@ -132,8 +132,8 @@ namespace toolchains {
class LLVM_LIBRARY_VISIBILITY NVPTXToolChain : public ToolChain {
public:
NVPTXToolChain(const Driver &D, const llvm::Triple &Triple,
- const llvm::Triple &HostTriple,
- const llvm::opt::ArgList &Args);
+ const llvm::Triple &HostTriple, const llvm::opt::ArgList &Args,
+ bool Freestanding);
NVPTXToolChain(const Driver &D, const llvm::Triple &Triple,
const llvm::opt::ArgList &Args);
@@ -142,6 +142,11 @@ class LLVM_LIBRARY_VISIBILITY NVPTXToolChain : public ToolChain {
TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
Action::OffloadKind DeviceOffloadKind) const override;
+ void
+ addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
+ llvm::opt::ArgStringList &CC1Args,
+ Action::OffloadKind DeviceOffloadKind) const override;
+
// Never try to use the integrated assembler with CUDA; always fork out to
// ptxas.
bool useIntegratedAs() const override { return false; }
@@ -168,6 +173,9 @@ class LLVM_LIBRARY_VISIBILITY NVPTXToolChain : public ToolChain {
protected:
Tool *buildAssembler() const override; // ptxas.
Tool *buildLinker() const override; // nvlink.
+
+private:
+ bool Freestanding = false;
};
class LLVM_LIBRARY_VISIBILITY CudaToolChain : public NVPTXToolChain {
diff --git a/clang/test/Driver/cuda-cross-compiling.c b/clang/test/Driver/cuda-cross-compiling.c
index 9750f09508010..7a62470b4ff1b 100644
--- a/clang/test/Driver/cuda-cross-compiling.c
+++ b/clang/test/Driver/cuda-cross-compiling.c
@@ -68,3 +68,12 @@
// DEFAULT: -cc1" "-triple" "nvptx64-nvidia-cuda" "-S" {{.*}} "-target-cpu" "sm_35" "-target-feature" "+ptx{{[0-9]+}}" {{.*}} "-o" "[[PTX:.+]].s"
// DEFAULT-NEXT: ptxas{{.*}}"-m64" "-O0" "--gpu-name" "sm_35" "--output-file" "[[CUBIN:.+]].cubin" "[[PTX]].s" "-c"
// DEFAULT-NEXT: nvlink{{.*}}"-o" "a.out" "-arch" "sm_35" {{.*}} "[[CUBIN]].cubin"
+
+//
+// Test to ensure that we enable handling global constructors in a freestanding
+// Nvidia compilation.
+//
+// RUN: %clang -target nvptx64-nvidia-cuda -march=sm_70 %s -### 2>&1 \
+// RUN: | FileCheck -check-prefix=LOWERING %s
+
+// LOWERING: -cc1" "-triple" "nvptx64-nvidia-cuda" {{.*}} "-mllvm" "--nvptx-lower-global-ctor-dtor"
diff --git a/llvm/lib/Target/NVPTX/CMakeLists.txt b/llvm/lib/Target/NVPTX/CMakeLists.txt
index 8690fc46b3740..6b35c2a0444f2 100644
--- a/llvm/lib/Target/NVPTX/CMakeLists.txt
+++ b/llvm/lib/Target/NVPTX/CMakeLists.txt
@@ -37,6 +37,7 @@ set(NVPTXCodeGen_sources
NVVMIntrRange.cpp
NVVMReflect.cpp
NVPTXProxyRegErasure.cpp
+ NVPTXCtorDtorLowering.cpp
)
add_llvm_target(NVPTXCodeGen
diff --git a/llvm/lib/Target/NVPTX/NVPTX.h b/llvm/lib/Target/NVPTX/NVPTX.h
index 521a7843b1142..9e8a2761010c4 100644
--- a/llvm/lib/Target/NVPTX/NVPTX.h
+++ b/llvm/lib/Target/NVPTX/NVPTX.h
@@ -39,6 +39,7 @@ FunctionPass *createNVPTXISelDag(NVPTXTargetMachine &TM,
llvm::CodeGenOpt::Level OptLevel);
ModulePass *createNVPTXAssignValidGlobalNamesPass();
ModulePass *createGenericToNVVMLegacyPass();
+ModulePass *createNVPTXCtorDtorLoweringLegacyPass();
FunctionPass *createNVVMIntrRangePass(unsigned int SmVersion);
FunctionPass *createNVVMReflectPass(unsigned int SmVersion);
MachineFunctionPass *createNVPTXPrologEpilogPass();
diff --git a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
index 4292e12cd336d..5fce6d67f3067 100644
--- a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
@@ -92,6 +92,11 @@
using namespace llvm;
+static cl::opt<bool>
+ LowerCtorDtor("nvptx-lower-global-ctor-dtor",
+ cl::desc("Lower GPU ctor / dtors to globals on the device."),
+ cl::init(false), cl::Hidden);
+
#define DEPOTNAME "__local_depot"
/// DiscoverDependentGlobals - Return a set of GlobalVariables on which \p V
@@ -788,12 +793,14 @@ bool NVPTXAsmPrinter::doInitialization(Module &M) {
report_fatal_error("Module has aliases, which NVPTX does not support.");
return true; // error
}
- if (!isEmptyXXStructor(M.getNamedGlobal("llvm.global_ctors"))) {
+ if (!isEmptyXXStructor(M.getNamedGlobal("llvm.global_ctors")) &&
+ !LowerCtorDtor) {
report_fatal_error(
"Module has a nontrivial global ctor, which NVPTX does not support.");
return true; // error
}
- if (!isEmptyXXStructor(M.getNamedGlobal("llvm.global_dtors"))) {
+ if (!isEmptyXXStructor(M.getNamedGlobal("llvm.global_dtors")) &&
+ !LowerCtorDtor) {
report_fatal_error(
"Module has a nontrivial global dtor, which NVPTX does not support.");
return true; // error
diff --git a/llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.cpp b/llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.cpp
new file mode 100644
index 0000000000000..51d0a1304951a
--- /dev/null
+++ b/llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.cpp
@@ -0,0 +1,116 @@
+//===-- NVPTXCtorDtorLowering.cpp - Handle global ctors and dtors --------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This pass creates a unified init and fini kernel with the required metadata
+//===----------------------------------------------------------------------===//
+
+#include "NVPTXCtorDtorLowering.h"
+#include "NVPTX.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Value.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Transforms/Utils/ModuleUtils.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "nvptx-lower-ctor-dtor"
+
+static cl::opt<std::string>
+ GlobalStr("nvptx-lower-global-ctor-dtor-id",
+ cl::desc("Override unique ID of ctor/dtor globals."),
+ cl::init(""), cl::Hidden);
+
+namespace {
+
+static std::string getHash(StringRef Str) {
+ llvm::MD5 Hasher;
+ llvm::MD5::MD5Result Hash;
+ Hasher.update(Str);
+ Hasher.final(Hash);
+ return llvm::utohexstr(Hash.low(), /*LowerCase=*/true);
+}
+
+static bool createInitOrFiniGlobls(Module &M, StringRef GlobalName,
+ bool IsCtor) {
+ GlobalVariable *GV = M.getGlobalVariable(GlobalName);
+ if (!GV || !GV->hasInitializer())
+ return false;
+ ConstantArray *GA = dyn_cast<ConstantArray>(GV->getInitializer());
+ if (!GA || GA->getNumOperands() == 0)
+ return false;
+
+ // NVPTX has no way to emit variables at specific sections or support for
+ // the traditional constructor sections. Instead, we emit mangled global
+ // names so the runtime can build the list manually.
+ for (Value *V : GA->operands()) {
+ auto *CS = cast<ConstantStruct>(V);
+ auto *F = cast<Constant>(CS->getOperand(1));
+ uint64_t Priority = cast<ConstantInt>(CS->getOperand(0))->getSExtValue();
+ std::string PriorityStr = "." + std::to_string(Priority);
+ // We append a semi-unique hash and the priority to the global name.
+ std::string GlobalID =
+ !GlobalStr.empty() ? GlobalStr : getHash(M.getSourceFileName());
+ std::string NameStr =
+ ((IsCtor ? "__init_array_object_" : "__fini_array_object_") +
+ F->getName() + "_" + GlobalID + "_" + std::to_string(Priority))
+ .str();
+ // PTX does not support exported names with '.' in them.
+ llvm::transform(NameStr, NameStr.begin(),
+ [](char c) { return c == '.' ? '_' : c; });
+
+ auto *GV = new GlobalVariable(M, F->getType(), /*IsConstant=*/true,
+ GlobalValue::ExternalLinkage, F, NameStr,
+ nullptr, GlobalValue::NotThreadLocal,
+ /*AddressSpace=*/4);
+ // This isn't respected by Nvidia, simply put here for clarity.
+ GV->setSection(IsCtor ? ".init_array" + PriorityStr
+ : ".fini_array" + PriorityStr);
+ GV->setVisibility(GlobalVariable::ProtectedVisibility);
+ appendToUsed(M, {GV});
+ }
+
+ GV->eraseFromParent();
+ return true;
+}
+
+static bool lowerCtorsAndDtors(Module &M) {
+ bool Modified = false;
+ Modified |= createInitOrFiniGlobls(M, "llvm.global_ctors", /*IsCtor =*/true);
+ Modified |= createInitOrFiniGlobls(M, "llvm.global_dtors", /*IsCtor =*/false);
+ return Modified;
+}
+
+class NVPTXCtorDtorLoweringLegacy final : public ModulePass {
+public:
+ static char ID;
+ NVPTXCtorDtorLoweringLegacy() : ModulePass(ID) {}
+ bool runOnModule(Module &M) override { return lowerCtorsAndDtors(M); }
+};
+
+} // End anonymous namespace
+
+PreservedAnalyses NVPTXCtorDtorLoweringPass::run(Module &M,
+ ModuleAnalysisManager &AM) {
+ return lowerCtorsAndDtors(M) ? PreservedAnalyses::none()
+ : PreservedAnalyses::all();
+}
+
+char NVPTXCtorDtorLoweringLegacy::ID = 0;
+char &llvm::NVPTXCtorDtorLoweringLegacyPassID = NVPTXCtorDtorLoweringLegacy::ID;
+INITIALIZE_PASS(NVPTXCtorDtorLoweringLegacy, DEBUG_TYPE,
+ "Lower ctors and dtors for NVPTX", false, false)
+
+ModulePass *llvm::createNVPTXCtorDtorLoweringLegacyPass() {
+ return new NVPTXCtorDtorLoweringLegacy();
+}
diff --git a/llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.h b/llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.h
new file mode 100644
index 0000000000000..c03fe97f1a782
--- /dev/null
+++ b/llvm/lib/Target/NVPTX/NVPTXCtorDtorLowering.h
@@ -0,0 +1,30 @@
+//===-- NVPTXCtorDtorLowering.h --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_NVPTX_NVPTXCTORDTORLOWERING_H
+#define LLVM_LIB_TARGET_NVPTX_NVPTXCTORDTORLOWERING_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+class Module;
+class PassRegistry;
+
+extern char &NVPTXCtorDtorLoweringLegacyPassID;
+extern void initializeNVPTXCtorDtorLoweringLegacyPass(PassRegistry &);
+
+/// Lower llvm.global_ctors and llvm.global_dtors to special kernels.
+class NVPTXCtorDtorLoweringPass
+ : public PassInfoMixin<NVPTXCtorDtorLoweringPass> {
+public:
+ PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
+};
+
+} // namespace llvm
+
+#endif // LLVM_LIB_TARGET_NVPTX_NVPTXCTORDTORLOWERING_H
diff --git a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
index 1c35740104add..79d8c7122766a 100644
--- a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
@@ -15,6 +15,7 @@
#include "NVPTXAliasAnalysis.h"
#include "NVPTXAllocaHoisting.h"
#include "NVPTXAtomicLower.h"
+#include "NVPTXCtorDtorLowering.h"
#include "NVPTXLowerAggrCopies.h"
#include "NVPTXMachineFunctionInfo.h"
#include "NVPTXTargetObjectFile.h"
@@ -68,8 +69,10 @@ void initializeGenericToNVVMLegacyPassPass(PassRegistry &);
void initializeNVPTXAllocaHoistingPass(PassRegistry &);
void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry&);
void initializeNVPTXAtomicLowerPass(PassRegistry &);
+void initializeNVPTXCtorDtorLoweringLegacyPass(PassRegistry &);
void initializeNVPTXLowerAggrCopiesPass(PassRegistry &);
void initializeNVPTXLowerAllocaPass(PassRegistry &);
+void initializeNVPTXCtorDtorLoweringLegacyPass(PassRegistry &);
void initializeNVPTXLowerArgsPass(PassRegistry &);
void initializeNVPTXProxyRegErasurePass(PassRegistry &);
void initializeNVVMIntrRangePass(PassRegistry &);
@@ -95,6 +98,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeNVPTXTarget() {
initializeNVPTXAtomicLowerPass(PR);
initializeNVPTXLowerArgsPass(PR);
initializeNVPTXLowerAllocaPass(PR);
+ initializeNVPTXCtorDtorLoweringLegacyPass(PR);
initializeNVPTXLowerAggrCopiesPass(PR);
initializeNVPTXProxyRegErasurePass(PR);
initializeNVPTXDAGToDAGISelPass(PR);
@@ -249,6 +253,10 @@ void NVPTXTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
PB.registerPipelineParsingCallback(
[](StringRef PassName, ModulePassManager &PM,
ArrayRef<PassBuilder::PipelineElement>) {
+ if (PassName == "nvptx-lower-ctor-dtor") {
+ PM.addPass(NVPTXCtorDtorLoweringPass());
+ return true;
+ }
if (PassName == "generic-to-nvvm") {
PM.addPass(GenericToNVVMPass());
return true;
@@ -369,6 +377,7 @@ void NVPTXPassConfig::addIRPasses() {
}
addPass(createAtomicExpandPass());
+ addPass(createNVPTXCtorDtorLoweringLegacyPass());
// === LSR and other generic IR passes ===
TargetPassConfig::addIRPasses();
diff --git a/llvm/test/CodeGen/NVPTX/lower-ctor-dtor.ll b/llvm/test/CodeGen/NVPTX/lower-ctor-dtor.ll
new file mode 100644
index 0000000000000..9dd3dfb2cf4cd
--- /dev/null
+++ b/llvm/test/CodeGen/NVPTX/lower-ctor-dtor.ll
@@ -0,0 +1,32 @@
+; RUN: opt -S -mtriple=nvptx64-- -nvptx-lower-ctor-dtor < %s | FileCheck %s
+; RUN: opt -S -mtriple=nvptx64-- -passes=nvptx-lower-ctor-dtor < %s | FileCheck %s
+; RUN: opt -S -mtriple=nvptx64-- -passes=nvptx-lower-ctor-dtor \
+; RUN: -nvptx-lower-global-ctor-dtor-id=unique_id < %s | FileCheck %s --check-prefix=GLOBAL
+
+; Make sure we get the same result if we run multiple times
+; RUN: opt -S -mtriple=nvptx64-- -passes=nvptx-lower-ctor-dtor,nvptx-lower-ctor-dtor < %s | FileCheck %s
+; RUN: llc -nvptx-lower-global-ctor-dtor -mtriple=nvptx64-amd-amdhsa -mcpu=sm_70 -filetype=asm -o - < %s | FileCheck %s -check-prefix=VISIBILITY
+
+ at llvm.global_ctors = appending addrspace(1) global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 1, ptr @foo, ptr null }]
+ at llvm.global_dtors = appending addrspace(1) global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 1, ptr @bar, ptr null }]
+
+; CHECK-NOT: @llvm.global_ctors
+; CHECK-NOT: @llvm.global_dtors
+
+; CHECK: @__init_array_object_foo_[[HASH:[0-9a-f]+]]_1 = protected addrspace(4) constant ptr @foo, section ".init_array.1"
+; CHECK: @__fini_array_object_bar_[[HASH:[0-9a-f]+]]_1 = protected addrspace(4) constant ptr @bar, section ".fini_array.1"
+; CHECK: @llvm.used = appending global [2 x ptr] [ptr addrspacecast (ptr addrspace(4) @__init_array_object_foo_[[HASH]]_1 to ptr), ptr addrspacecast (ptr addrspace(4) @__fini_array_object_bar_[[HASH]]_1 to ptr)], section "llvm.metadata"
+; GLOBAL: @__init_array_object_foo_unique_id_1 = protected addrspace(4) constant ptr @foo, section ".init_array.1"
+; GLOBAL: @__fini_array_object_bar_unique_id_1 = protected addrspace(4) constant ptr @bar, section ".fini_array.1"
+; GLOBAL: @llvm.used = appending global [2 x ptr] [ptr addrspacecast (ptr addrspace(4) @__init_array_object_foo_unique_id_1 to ptr), ptr addrspacecast (ptr addrspace(4) @__fini_array_object_bar_unique_id_1 to ptr)], section "llvm.metadata"
+
+; VISIBILITY: .visible .const .align 8 .u64 __init_array_object_foo_[[HASH:[0-9a-f]+]]_1 = foo;
+; VISIBILITY: .visible .const .align 8 .u64 __fini_array_object_bar_[[HASH:[0-9a-f]+]]_1 = bar;
+
+define internal void @foo() {
+ ret void
+}
+
+define internal void @bar() {
+ ret void
+}
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