[flang-commits] [flang] dd33f57 - [Flang][Driver] Added support for -funique-internal-linkage-names option (#216680)
via flang-commits
flang-commits at lists.llvm.org
Wed Sep 23 05:47:46 PDT 2026
Author: Kaviya Rajendiran
Date: 2026-09-23T18:17:35+05:30
New Revision: dd33f57479c1d1d86649a1867b79be88ce04da73
URL: https://github.com/llvm/llvm-project/commit/dd33f57479c1d1d86649a1867b79be88ce04da73
DIFF: https://github.com/llvm/llvm-project/commit/dd33f57479c1d1d86649a1867b79be88ce04da73.diff
LOG: [Flang][Driver] Added support for -funique-internal-linkage-names option (#216680)
The option `-funique-internal-linkage-names` appends an MD5 hash suffix
`(.__uniq.<hash>)` to internal procedure names and sets
`"sample-profile-suffix-elision-policy"="selected"` on those functions,
enabling the sample profiler to correctly match profiles to internal
procedures across compilation units.
Implementation:
- Added a unique hash suffix to internal procedure names when
`-funique-internal-linkage-names` is enabled. The suffix is derived from
the source file path and disambiguates identically named internal
procedures across different compilation units, which helps accurate
sample-based profiling.
- Added the function attribute
`"sample-profile-suffix-elision-policy"="selected"` on internal
procedures in LLVM IR. This attribute is used by the LLVM sample profile
loader to control suffix stripping during profile matching
Added:
flang/test/Driver/funique-internal-linkage-names.f90
flang/test/Lower/unique-internal-linkage-names.f90
flang/test/Transforms/function-attrs-unique-internal-linkage-names.fir
mlir/test/Target/LLVMIR/Import/sample-profile-suffix-elision-policy.ll
mlir/test/Target/LLVMIR/sample-profile-suffix-elision-policy.mlir
Modified:
clang/include/clang/Options/Options.td
clang/lib/Driver/ToolChains/Flang.cpp
flang/include/flang/Frontend/CodeGenOptions.def
flang/include/flang/Lower/Bridge.h
flang/include/flang/Optimizer/Transforms/Passes.td
flang/include/flang/Tools/CrossToolHelpers.h
flang/lib/Frontend/CompilerInvocation.cpp
flang/lib/Lower/Bridge.cpp
flang/lib/Optimizer/Passes/Pipelines.cpp
flang/lib/Optimizer/Transforms/CompilerGeneratedNames.cpp
flang/lib/Optimizer/Transforms/FunctionAttr.cpp
mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
mlir/lib/Target/LLVMIR/ModuleImport.cpp
mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
Removed:
################################################################################
diff --git a/clang/include/clang/Options/Options.td b/clang/include/clang/Options/Options.td
index d4bf48040029f..15b2196b68e76 100644
--- a/clang/include/clang/Options/Options.td
+++ b/clang/include/clang/Options/Options.td
@@ -5089,10 +5089,10 @@ defm unique_basic_block_section_names : BoolFOption<"unique-basic-block-section-
NegFlag<SetFalse>>;
defm unique_internal_linkage_names : BoolFOption<"unique-internal-linkage-names",
CodeGenOpts<"UniqueInternalLinkageNames">, DefaultFalse,
- PosFlag<SetTrue, [], [ClangOption, CC1Option],
+ PosFlag<SetTrue, [], [ClangOption, CC1Option, FlangOption, FC1Option],
"Uniqueify Internal Linkage Symbol Names by appending"
" the MD5 hash of the module path">,
- NegFlag<SetFalse>>;
+ NegFlag<SetFalse, [], [ClangOption, CC1Option, FlangOption]>>;
defm unique_section_names : BoolFOption<"unique-section-names",
CodeGenOpts<"UniqueSectionNames">, DefaultTrue,
NegFlag<SetFalse, [], [ClangOption, CC1Option],
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index 95a11eb36be08..b333f0d56a395 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -358,6 +358,9 @@ void Flang::addCodegenOptions(const ArgList &Args,
Args.AddLastArg(CmdArgs, options::OPT_ffp_sum_reassociation,
options::OPT_fno_fp_sum_reassociation);
+ Args.addOptInFlag(CmdArgs, options::OPT_funique_internal_linkage_names,
+ options::OPT_fno_unique_internal_linkage_names);
+
handleInterchangeLoopsArgs(Args, CmdArgs);
handleVectorizeLoopsArgs(Args, CmdArgs);
handleVectorizeSLPArgs(Args, CmdArgs);
diff --git a/flang/include/flang/Frontend/CodeGenOptions.def b/flang/include/flang/Frontend/CodeGenOptions.def
index a036311829e28..86994f7710576 100644
--- a/flang/include/flang/Frontend/CodeGenOptions.def
+++ b/flang/include/flang/Frontend/CodeGenOptions.def
@@ -61,6 +61,7 @@ CODEGENOPT(AliasAnalysis, 1, 0) ///< Enable alias analysis pass
CODEGENOPT(DwarfVersion, 3, 0) ///< Dwarf version
CODEGENOPT(DebugInfoForProfiling, 1, 0) ///< Emit extra debug info to make sample profile more accurate.
CODEGENOPT(PseudoProbeForProfiling, 1, 0) ///< Emit pseudo probes for sample profiling.
+CODEGENOPT(UniqueInternalLinkageNames, 1, 0) ///< Append MD5 hash to internal linkage symbols.
CODEGENOPT(Underscoring, 1, 1)
ENUM_CODEGENOPT(FPMaxminBehavior, Fortran::common::FPMaxminBehavior, 2, Fortran::common::FPMaxminBehavior::Legacy)
diff --git a/flang/include/flang/Lower/Bridge.h b/flang/include/flang/Lower/Bridge.h
index dbddef7b1169d..f8421f27e6ec2 100644
--- a/flang/include/flang/Lower/Bridge.h
+++ b/flang/include/flang/Lower/Bridge.h
@@ -24,6 +24,7 @@
#include "flang/Support/Fortran.h"
#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/OwningOpRef.h"
+#include "llvm/ProfileData/SampleProf.h"
#include <set>
namespace llvm {
@@ -118,6 +119,8 @@ class LoweringBridge {
return languageFeatures;
}
+ const std::string &getModuleNameHash() const { return moduleNameHash; }
+
/// Create a folding context. Careful: this is very expensive.
Fortran::evaluate::FoldingContext createFoldingContext();
@@ -180,6 +183,7 @@ class LoweringBridge {
const std::vector<Fortran::lower::EnvironmentDefault> &envDefaults;
const Fortran::common::LanguageFeatureControl &languageFeatures;
std::set<std::string> tempNames;
+ std::string moduleNameHash;
std::optional<mlir::DiagnosticEngine::HandlerID> diagHandlerID;
};
diff --git a/flang/include/flang/Optimizer/Transforms/Passes.td b/flang/include/flang/Optimizer/Transforms/Passes.td
index 619f44e53bac5..f857e19f4ae46 100644
--- a/flang/include/flang/Optimizer/Transforms/Passes.td
+++ b/flang/include/flang/Optimizer/Transforms/Passes.td
@@ -527,6 +527,10 @@ def FunctionAttr : Pass<"function-attr", "mlir::func::FuncOp"> {
/*default=*/"false",
"Set the disable-tail-calls attribute on functions to prevent "
"tail call optimization.">,
+ Option<"UniqueInternalLinkageNames", "unique-internal-linkage-names",
+ "bool", /*default=*/"false",
+ "Set the sample-profile-suffix-elision-policy attribute on "
+ "internal linkage functions in the module.">,
Option<"tuneCPU", "tune-cpu", "std::string", /*default=*/"",
"Set the tune-cpu attribute on functions in the module.">,
Option<"setNoCapture", "set-nocapture", "bool", /*default=*/"false",
diff --git a/flang/include/flang/Tools/CrossToolHelpers.h b/flang/include/flang/Tools/CrossToolHelpers.h
index 692b7fd7129f2..b9add141663b9 100644
--- a/flang/include/flang/Tools/CrossToolHelpers.h
+++ b/flang/include/flang/Tools/CrossToolHelpers.h
@@ -138,6 +138,7 @@ struct MLIRToLLVMPassPipelineConfig : public FlangEPCallBacks {
Reciprocals = opts.Reciprocals;
PreferVectorWidth = opts.PreferVectorWidth;
UseSampleProfile = !opts.SampleProfileFile.empty();
+ UniqueInternalLinkageNames = opts.UniqueInternalLinkageNames;
DebugInfoForProfiling = opts.DebugInfoForProfiling;
if (opts.InstrumentFunctions) {
InstrumentFunctionEntry = "__cyg_profile_func_enter";
@@ -178,6 +179,8 @@ struct MLIRToLLVMPassPipelineConfig : public FlangEPCallBacks {
bool EnableOpenMPIsTargetDevice =
false; ///< Compiling for an OpenMP target device.
bool UseSampleProfile = false; ///< Enable sample based profiling
+ bool UniqueInternalLinkageNames = false; ///< Append MD5 hash suffix to
+ ///< internal linkage symbol names.
bool DebugInfoForProfiling = false; ///< Enable extra debugging info
bool DisableTailCalls = false; ///< Disable tail call optimization
bool EnableOpenMPSimd = false; ///< Enable OpenMP simd-only mode.
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index 85e5f477dcb8c..1dd28e4f0a99b 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -327,6 +327,9 @@ static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
args.hasFlag(clang::options::OPT_floop_interchange,
clang::options::OPT_fno_loop_interchange, true);
+ if (args.hasArg(clang::options::OPT_funique_internal_linkage_names))
+ opts.UniqueInternalLinkageNames = 1;
+
if (args.getLastArg(clang::options::OPT_fexperimental_loop_fusion))
opts.FuseLoops = 1;
diff --git a/flang/lib/Lower/Bridge.cpp b/flang/lib/Lower/Bridge.cpp
index 784a87cc61997..968cdbc951ecc 100644
--- a/flang/lib/Lower/Bridge.cpp
+++ b/flang/lib/Lower/Bridge.cpp
@@ -1239,9 +1239,15 @@ class FirConverter : public Fortran::lower::AbstractConverter {
}
std::string
mangleName(const Fortran::semantics::Symbol &symbol) override final {
- return Fortran::lower::mangle::mangleName(
+ std::string mangledName = Fortran::lower::mangle::mangleName(
symbol, scopeBlockIdMap, /*keepExternalInScope=*/false,
getLoweringOptions().getUnderscoring());
+ const std::string &hash = bridge.getModuleNameHash();
+ if (!hash.empty() &&
+ Fortran::semantics::ClassifyProcedure(symbol) ==
+ Fortran::semantics::ProcedureDefinitionClass::Internal)
+ mangledName += hash;
+ return mangledName;
}
std::string mangleName(
const Fortran::semantics::DerivedTypeSpec &derivedType) override final {
@@ -7136,6 +7142,13 @@ Fortran::lower::LoweringBridge::LoweringBridge(
else if (languageFeatures.IsEnabled(
Fortran::common::LanguageFeature::CudaManaged))
fir::setCudaHeapAllocMode(*module, fir::CudaHeapAllocMode::Managed);
+
+ if (cgOpts.UniqueInternalLinkageNames) {
+ if (auto fileLoc = mlir::dyn_cast<mlir::FileLineColLoc>(module->getLoc())) {
+ moduleNameHash =
+ llvm::getUniqueInternalLinkagePostfix(fileLoc.getFilename());
+ }
+ }
}
Fortran::lower::LoweringBridge::~LoweringBridge() {
diff --git a/flang/lib/Optimizer/Passes/Pipelines.cpp b/flang/lib/Optimizer/Passes/Pipelines.cpp
index b73a1ce4a47c6..fc5b5ef6460a9 100644
--- a/flang/lib/Optimizer/Passes/Pipelines.cpp
+++ b/flang/lib/Optimizer/Passes/Pipelines.cpp
@@ -464,8 +464,8 @@ void createDefaultFIRCodeGenPassPipeline(mlir::PassManager &pm,
config.InstrumentFunctionExit, config.NoInfsFPMath, config.NoNaNsFPMath,
config.ApproxFuncFPMath, config.NoSignedZerosFPMath, config.UnsafeFPMath,
config.Reciprocals, config.PreferVectorWidth, config.UseSampleProfile,
- config.DisableTailCalls, /*tuneCPU=*/"", setNoCapture, setNoAlias,
- setReadOnly}));
+ config.DisableTailCalls, config.UniqueInternalLinkageNames,
+ /*tuneCPU=*/"", setNoCapture, setNoAlias, setReadOnly}));
if (config.EnableOpenMP) {
pm.addNestedPass<mlir::func::FuncOp>(
diff --git a/flang/lib/Optimizer/Transforms/CompilerGeneratedNames.cpp b/flang/lib/Optimizer/Transforms/CompilerGeneratedNames.cpp
index 7a173da514b16..ca33639bbb888 100644
--- a/flang/lib/Optimizer/Transforms/CompilerGeneratedNames.cpp
+++ b/flang/lib/Optimizer/Transforms/CompilerGeneratedNames.cpp
@@ -45,6 +45,8 @@ void CompilerGeneratedNamesConversionPass::runOnOperation() {
auto processOp = [&](mlir::Operation &op) {
auto symName = mlir::cast<mlir::SymbolOpInterface>(&op).getNameAttr();
+ if (symName.getValue().contains(".__uniq."))
+ return;
auto deconstructedName = fir::NameUniquer::deconstruct(symName);
if (deconstructedName.first != fir::NameUniquer::NameKind::NOT_UNIQUED &&
!fir::NameUniquer::isExternalFacingUniquedName(deconstructedName)) {
diff --git a/flang/lib/Optimizer/Transforms/FunctionAttr.cpp b/flang/lib/Optimizer/Transforms/FunctionAttr.cpp
index 1aadd16fe1cf4..958a9ea87cd6d 100644
--- a/flang/lib/Optimizer/Transforms/FunctionAttr.cpp
+++ b/flang/lib/Optimizer/Transforms/FunctionAttr.cpp
@@ -144,6 +144,13 @@ void FunctionAttrPass::runOnOperation() {
context, mlir::LLVM::LLVMFuncOp::getUseSampleProfileAttrName(
llvmFuncOpName)),
mlir::BoolAttr::get(context, true));
+ if (UniqueInternalLinkageNames && fir::isInternalProcedure(func))
+ func->setAttr(
+ getLlvmFuncPropertyAttrName(
+ context,
+ mlir::LLVM::LLVMFuncOp::getSampleProfileSuffixElisionPolicyAttrName(
+ llvmFuncOpName)),
+ mlir::StringAttr::get(context, "selected"));
if (disableTailCalls)
func->setAttr(
diff --git a/flang/test/Driver/funique-internal-linkage-names.f90 b/flang/test/Driver/funique-internal-linkage-names.f90
new file mode 100644
index 0000000000000..d81e405cff541
--- /dev/null
+++ b/flang/test/Driver/funique-internal-linkage-names.f90
@@ -0,0 +1,14 @@
+! Test that -funique-internal-linkage-names / -fno-unique-internal-linkage-names are forwarded to flang -fc1.
+
+! RUN: %flang -### %s 2>&1 | FileCheck %s --check-prefix=DISABLED
+! RUN: %flang -### -funique-internal-linkage-names %s 2>&1 | FileCheck %s --check-prefix=ENABLED
+! RUN: %flang -### -fno-unique-internal-linkage-names %s 2>&1 | FileCheck %s --check-prefix=DISABLED
+! RUN: %flang -### -funique-internal-linkage-names -fno-unique-internal-linkage-names %s 2>&1 | FileCheck %s --check-prefix=DISABLED
+! RUN: %flang -### -fno-unique-internal-linkage-names -funique-internal-linkage-names %s 2>&1 | FileCheck %s --check-prefix=ENABLED
+
+! DISABLED: "-fc1"
+! DISABLED-NOT: "-funique-internal-linkage-names"
+! DISABLED-NOT: "-fno-unique-internal-linkage-names"
+
+! ENABLED: "-fc1"
+! ENABLED-SAME: "-funique-internal-linkage-names"
diff --git a/flang/test/Lower/unique-internal-linkage-names.f90 b/flang/test/Lower/unique-internal-linkage-names.f90
new file mode 100644
index 0000000000000..7699212ddff3a
--- /dev/null
+++ b/flang/test/Lower/unique-internal-linkage-names.f90
@@ -0,0 +1,17 @@
+! Test that -funique-internal-linkage-names appends a .__uniq. hash suffix
+! to internal procedures at the FIR level.
+
+! RUN: %flang_fc1 -emit-fir -funique-internal-linkage-names -o - %s | FileCheck %s
+
+! CHECK-LABEL: func.func @_QPtest
+! CHECK: fir.call @_QFtestPfoo.__uniq.{{[0-9]+}}
+
+! CHECK: func.func private @_QFtestPfoo.__uniq.{{[0-9]+}}
+! CHECK-SAME: attributes {fir.host_symbol = @_QPtest, llvm.linkage = #llvm.linkage<internal>}
+
+subroutine test()
+ call foo()
+contains
+ subroutine foo()
+ end subroutine
+end subroutine
diff --git a/flang/test/Transforms/function-attrs-unique-internal-linkage-names.fir b/flang/test/Transforms/function-attrs-unique-internal-linkage-names.fir
new file mode 100644
index 0000000000000..9d5cf40ea6e35
--- /dev/null
+++ b/flang/test/Transforms/function-attrs-unique-internal-linkage-names.fir
@@ -0,0 +1,26 @@
+// RUN: fir-opt --function-attr="unique-internal-linkage-names=true" %s | FileCheck %s --check-prefix=ENABLED
+// RUN: fir-opt --function-attr="unique-internal-linkage-names=false" %s | FileCheck %s --check-prefix=DISABLED
+
+// Internal procedure: has fir.host_symbol, should get the attribute.
+// ENABLED-LABEL: func.func @_QFhost_subPinner(
+// ENABLED-SAME: llvm.sample_profile_suffix_elision_policy = "selected"
+
+// DISABLED-LABEL: func.func @_QFhost_subPinner(
+// DISABLED-NOT: sample_profile_suffix_elision_policy
+func.func @_QFhost_subPinner(%arg0: !fir.ref<i32>) attributes {fir.host_symbol = @_QFhost_sub} {
+ return
+}
+
+// Host procedure: no fir.host_symbol, should NOT get the attribute.
+// ENABLED-LABEL: func.func @_QFhost_sub(
+// ENABLED-NOT: sample_profile_suffix_elision_policy
+func.func @_QFhost_sub(%arg0: !fir.ref<i32>) {
+ return
+}
+
+// External procedure: should NOT get the attribute.
+// ENABLED-LABEL: func.func @_QPexternal_sub(
+// ENABLED-NOT: sample_profile_suffix_elision_policy
+func.func @_QPexternal_sub(%arg0: !fir.ref<i32>) {
+ return
+}
diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
index 5998bd01f9bdf..c8efc741d0acb 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
@@ -2160,7 +2160,8 @@ def LLVM_LLVMFuncOp : LLVM_Op<"func", [
OptionalAttr<LLVM_FunctionMetadataArrayAttr>:$function_metadata,
OptionalAttr<UWTableKindAttr>:$uwtable_kind,
OptionalAttr<BoolAttr>:$use_sample_profile,
- OptionalAttr<BoolAttr>:$disable_tail_calls
+ OptionalAttr<BoolAttr>:$disable_tail_calls,
+ OptionalAttr<StrAttr>:$sample_profile_suffix_elision_policy
);
let regions = (region AnyRegion:$body);
diff --git a/mlir/lib/Target/LLVMIR/ModuleImport.cpp b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
index bfecde8b664a9..04f69433b97a0 100644
--- a/mlir/lib/Target/LLVMIR/ModuleImport.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
@@ -2927,6 +2927,7 @@ static constexpr std::array kExplicitLLVMFuncOpAttributes{
StringLiteral("save-reg-params"),
StringLiteral("target-features"),
StringLiteral("trap-func-name"),
+ StringLiteral("sample-profile-suffix-elision-policy"),
StringLiteral("tune-cpu"),
StringLiteral("uniform-work-group-size"),
StringLiteral("uwtable"),
@@ -3104,6 +3105,12 @@ void ModuleImport::processFunctionAttributes(llvm::Function *func,
<< "unknown value '" << val << "' for 'disable-tail-calls' attribute";
}
+ if (llvm::Attribute attr =
+ func->getFnAttribute("sample-profile-suffix-elision-policy");
+ attr.isStringAttribute())
+ funcOp.setSampleProfileSuffixElisionPolicy(
+ StringAttr::get(context, attr.getValueAsString()));
+
if (llvm::Attribute attr = func->getFnAttribute("target-cpu");
attr.isStringAttribute())
funcOp.setTargetCpuAttr(StringAttr::get(context, attr.getValueAsString()));
diff --git a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
index 50365b5a5b3a1..bd11a493f4bd3 100644
--- a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
@@ -1746,6 +1746,11 @@ LogicalResult ModuleTranslation::convertOneFunction(LLVMFuncOp func) {
llvmFunc->addFnAttr("disable-tail-calls",
llvm::toStringRef(*disableTailCalls));
+ if (auto sampleProfileSuffixElisionPolicy =
+ func.getSampleProfileSuffixElisionPolicy())
+ llvmFunc->addFnAttr("sample-profile-suffix-elision-policy",
+ *sampleProfileSuffixElisionPolicy);
+
if (auto attr = func.getVscaleRange())
llvmFunc->addFnAttr(llvm::Attribute::getWithVScaleRangeArgs(
getLLVMContext(), attr->getMinRange().getInt(),
diff --git a/mlir/test/Target/LLVMIR/Import/sample-profile-suffix-elision-policy.ll b/mlir/test/Target/LLVMIR/Import/sample-profile-suffix-elision-policy.ll
new file mode 100644
index 0000000000000..8f9a59fea827c
--- /dev/null
+++ b/mlir/test/Target/LLVMIR/Import/sample-profile-suffix-elision-policy.ll
@@ -0,0 +1,15 @@
+; RUN: mlir-translate -import-llvm %s | FileCheck %s
+
+; CHECK-LABEL: llvm.func @with_elision_policy()
+; CHECK-SAME: sample_profile_suffix_elision_policy = "selected"
+define void @with_elision_policy() #0 {
+ ret void
+}
+
+; CHECK-LABEL: llvm.func @without_elision_policy()
+; CHECK-NOT: sample_profile_suffix_elision_policy
+define void @without_elision_policy() {
+ ret void
+}
+
+attributes #0 = { "sample-profile-suffix-elision-policy"="selected" }
diff --git a/mlir/test/Target/LLVMIR/sample-profile-suffix-elision-policy.mlir b/mlir/test/Target/LLVMIR/sample-profile-suffix-elision-policy.mlir
new file mode 100644
index 0000000000000..4953620571318
--- /dev/null
+++ b/mlir/test/Target/LLVMIR/sample-profile-suffix-elision-policy.mlir
@@ -0,0 +1,14 @@
+// RUN: mlir-translate -mlir-to-llvmir %s | FileCheck %s
+
+// CHECK: define void @with_elision_policy() #[[ATTRS_WITH:.*]] {
+llvm.func @with_elision_policy() attributes {sample_profile_suffix_elision_policy = "selected"} {
+ llvm.return
+}
+
+// CHECK: define void @without_elision_policy() {
+// CHECK-NOT: "sample-profile-suffix-elision-policy"
+llvm.func @without_elision_policy() {
+ llvm.return
+}
+
+// CHECK: attributes #[[ATTRS_WITH]] = { "sample-profile-suffix-elision-policy"="selected" }
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