[clang] 5c1084e - [OpenMP] Context selector extensions for template functions
Johannes Doerfert via cfe-commits
cfe-commits at lists.llvm.org
Wed Sep 16 11:40:08 PDT 2020
Author: Johannes Doerfert
Date: 2020-09-16T13:37:10-05:00
New Revision: 5c1084e8840b02d410ba125cbba466465242d820
URL: https://github.com/llvm/llvm-project/commit/5c1084e8840b02d410ba125cbba466465242d820
DIFF: https://github.com/llvm/llvm-project/commit/5c1084e8840b02d410ba125cbba466465242d820.diff
LOG: [OpenMP] Context selector extensions for template functions
With this extension the effects of `omp begin declare variant` will be
applied to template function declarations. The behavior is opt-in and
controlled by the `extension(allow_templates)` trait. While generally
useful, this will enable us to implement complex math function calls by
overloading the templates of the standard library with the ones in
libc++.
Reviewed By: JonChesterfield
Differential Revision: https://reviews.llvm.org/D85735
Added:
clang/test/AST/ast-dump-openmp-begin-declare-variant_template_2.cpp
Modified:
clang/include/clang/Basic/AttrDocs.td
clang/include/clang/Sema/Sema.h
clang/lib/Headers/openmp_wrappers/cmath
clang/lib/Parse/ParseOpenMP.cpp
clang/lib/Sema/SemaDecl.cpp
clang/lib/Sema/SemaOpenMP.cpp
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
Removed:
################################################################################
diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
index e0f875a905b7..aab337a4e24a 100644
--- a/clang/include/clang/Basic/AttrDocs.td
+++ b/clang/include/clang/Basic/AttrDocs.td
@@ -3679,6 +3679,7 @@ Clang provides the following context selector extensions, used via
match_any
match_none
disable_implicit_base
+ allow_templates
The match extensions change when the *entire* context selector is considered a
match for an OpenMP context. The default is ``all``, with ``none`` no trait in the
@@ -3690,6 +3691,11 @@ applied to a definition. If ``disable_implicit_base`` is given, we will not
introduce an implicit base function for a variant if no base function was
found. The variant is still generated but will never be called, due to the
absence of a base function and consequently calls to a base function.
+The allow extensions change when the ``begin declare variant`` effect is
+applied to a definition. If ``allow_templates`` is given, template function
+definitions are considered as specializations of existing or assumed template
+declarations with the same name. The template parameters for the base functions
+are used to instantiate the specialization.
}];
}
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 9502c104be68..9ee8e338e732 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -10031,15 +10031,15 @@ class Sema final {
/// The declarator \p D defines a function in the scope \p S which is nested
/// in an `omp begin/end declare variant` scope. In this method we create a
/// declaration for \p D and rename \p D according to the OpenMP context
- /// selector of the surrounding scope.
- FunctionDecl *
- ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(Scope *S,
- Declarator &D);
+ /// selector of the surrounding scope. Return all base functions in \p Bases.
+ void ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(
+ Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParameterLists,
+ SmallVectorImpl<FunctionDecl *> &Bases);
- /// Register \p FD as specialization of \p BaseFD in the current `omp
- /// begin/end declare variant` scope.
+ /// Register \p D as specialization of all base functions in \p Bases in the
+ /// current `omp begin/end declare variant` scope.
void ActOnFinishedFunctionDefinitionInOpenMPDeclareVariantScope(
- FunctionDecl *FD, FunctionDecl *BaseFD);
+ Decl *D, SmallVectorImpl<FunctionDecl *> &Bases);
public:
diff --git a/clang/lib/Headers/openmp_wrappers/cmath b/clang/lib/Headers/openmp_wrappers/cmath
index bd6011eb6f6d..1aff66af7d52 100644
--- a/clang/lib/Headers/openmp_wrappers/cmath
+++ b/clang/lib/Headers/openmp_wrappers/cmath
@@ -24,8 +24,11 @@
// which might live in cstdlib.
#include <cstdlib>
+// We need limits because __clang_cuda_cmath.h below uses `std::numeric_limit`.
+#include <limits>
+
#pragma omp begin declare variant match( \
- device = {arch(nvptx, nvptx64)}, implementation = {extension(match_any)})
+ device = {arch(nvptx, nvptx64)}, implementation = {extension(match_any, allow_templates)})
#define __CUDA__
#define __OPENMP_NVPTX__
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 184dd48c391c..34bddd2e10d7 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -939,6 +939,10 @@ static bool checkExtensionProperty(Parser &P, SourceLocation Loc,
TraitProperty::implementation_extension_disable_implicit_base)
return true;
+ if (TIProperty.Kind ==
+ TraitProperty::implementation_extension_allow_templates)
+ return true;
+
auto IsMatchExtension = [](OMPTraitProperty &TP) {
return (TP.Kind ==
llvm::omp::TraitProperty::implementation_extension_match_all ||
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 3e0d284bdf71..416a75fa4323 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -13757,19 +13757,17 @@ Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D,
// variant` annotation which specifies the mangled definition as a
// specialization function under the OpenMP context defined as part of the
// `omp begin declare variant`.
- FunctionDecl *BaseFD = nullptr;
- if (LangOpts.OpenMP && isInOpenMPDeclareVariantScope() &&
- TemplateParameterLists.empty())
- BaseFD = ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(
- ParentScope, D);
+ SmallVector<FunctionDecl *, 4> Bases;
+ if (LangOpts.OpenMP && isInOpenMPDeclareVariantScope())
+ ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(
+ ParentScope, D, TemplateParameterLists, Bases);
D.setFunctionDefinitionKind(FDK_Definition);
Decl *DP = HandleDeclarator(ParentScope, D, TemplateParameterLists);
Decl *Dcl = ActOnStartOfFunctionDef(FnBodyScope, DP, SkipBody);
- if (BaseFD)
- ActOnFinishedFunctionDefinitionInOpenMPDeclareVariantScope(
- cast<FunctionDecl>(Dcl), BaseFD);
+ if (!Bases.empty())
+ ActOnFinishedFunctionDefinitionInOpenMPDeclareVariantScope(Dcl, Bases);
return Dcl;
}
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 36c257440a48..92f6141b6d38 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -5868,10 +5868,21 @@ static void setPrototype(Sema &S, FunctionDecl *FD, FunctionDecl *FDWithProto,
Sema::OMPDeclareVariantScope::OMPDeclareVariantScope(OMPTraitInfo &TI)
: TI(&TI), NameSuffix(TI.getMangledName()) {}
-FunctionDecl *
-Sema::ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(Scope *S,
- Declarator &D) {
+void Sema::ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(
+ Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParamLists,
+ SmallVectorImpl<FunctionDecl *> &Bases) {
+ if (!D.getIdentifier())
+ return;
+
OMPDeclareVariantScope &DVScope = OMPDeclareVariantScopes.back();
+
+ // Template specialization is an extension, check if we do it.
+ bool IsTemplated = !TemplateParamLists.empty();
+ if (IsTemplated &
+ !DVScope.TI->isExtensionActive(
+ llvm::omp::TraitProperty::implementation_extension_allow_templates))
+ return;
+
IdentifierInfo *BaseII = D.getIdentifier();
LookupResult Lookup(*this, DeclarationName(BaseII), D.getIdentifierLoc(),
LookupOrdinaryName);
@@ -5883,9 +5894,13 @@ Sema::ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(Scope *S,
bool IsConstexpr = D.getDeclSpec().getConstexprSpecifier() == CSK_constexpr;
bool IsConsteval = D.getDeclSpec().getConstexprSpecifier() == CSK_consteval;
- FunctionDecl *BaseFD = nullptr;
for (auto *Candidate : Lookup) {
- auto *UDecl = dyn_cast<FunctionDecl>(Candidate->getUnderlyingDecl());
+ auto *CandidateDecl = Candidate->getUnderlyingDecl();
+ FunctionDecl *UDecl = nullptr;
+ if (IsTemplated && isa<FunctionTemplateDecl>(CandidateDecl))
+ UDecl = cast<FunctionTemplateDecl>(CandidateDecl)->getTemplatedDecl();
+ else if (!IsTemplated)
+ UDecl = dyn_cast<FunctionDecl>(CandidateDecl);
if (!UDecl)
continue;
@@ -5896,23 +5911,31 @@ Sema::ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(Scope *S,
if (UDecl->isConsteval() && !IsConsteval)
continue;
- QualType NewType = Context.mergeFunctionTypes(
- FType, UDecl->getType(), /* OfBlockPointer */ false,
- /* Unqualified */ false, /* AllowCXX */ true);
- if (NewType.isNull())
- continue;
+ QualType UDeclTy = UDecl->getType();
+ // TODO: Verify types for templates eventually.
+ if (!UDeclTy->isDependentType()) {
+ QualType NewType = Context.mergeFunctionTypes(
+ FType, UDeclTy, /* OfBlockPointer */ false,
+ /* Unqualified */ false, /* AllowCXX */ true);
+ if (NewType.isNull())
+ continue;
+ }
// Found a base!
- BaseFD = UDecl;
- break;
+ Bases.push_back(UDecl);
}
bool UseImplicitBase = !DVScope.TI->isExtensionActive(
llvm::omp::TraitProperty::implementation_extension_disable_implicit_base);
// If no base was found we create a declaration that we use as base.
- if (!BaseFD && UseImplicitBase) {
- BaseFD = cast<FunctionDecl>(ActOnDeclarator(S, D));
- BaseFD->setImplicit(true);
+ if (Bases.empty() && UseImplicitBase) {
+ D.setFunctionDefinitionKind(FDK_Declaration);
+ Decl *BaseD = HandleDeclarator(S, D, TemplateParamLists);
+ BaseD->setImplicit(true);
+ if (auto *BaseTemplD = dyn_cast<FunctionTemplateDecl>(BaseD))
+ Bases.push_back(BaseTemplD->getTemplatedDecl());
+ else
+ Bases.push_back(cast<FunctionDecl>(BaseD));
}
std::string MangledName;
@@ -5923,17 +5946,21 @@ Sema::ActOnStartOfFunctionDefinitionInOpenMPDeclareVariantScope(Scope *S,
VariantII.setMangledOpenMPVariantName(true);
D.SetIdentifier(&VariantII, D.getBeginLoc());
- return BaseFD;
}
void Sema::ActOnFinishedFunctionDefinitionInOpenMPDeclareVariantScope(
- FunctionDecl *FD, FunctionDecl *BaseFD) {
+ Decl *D, SmallVectorImpl<FunctionDecl *> &Bases) {
// Do not mark function as is used to prevent its emission if this is the
// only place where it is used.
EnterExpressionEvaluationContext Unevaluated(
*this, Sema::ExpressionEvaluationContext::Unevaluated);
- Expr *VariantFuncRef = DeclRefExpr::Create(
+ FunctionDecl *FD = nullptr;
+ if (auto *UTemplDecl = dyn_cast<FunctionTemplateDecl>(D))
+ FD = UTemplDecl->getTemplatedDecl();
+ else
+ FD = cast<FunctionDecl>(D);
+ auto *VariantFuncRef = DeclRefExpr::Create(
Context, NestedNameSpecifierLoc(), SourceLocation(), FD,
/* RefersToEnclosingVariableOrCapture */ false,
/* NameLoc */ FD->getLocation(), FD->getType(), ExprValueKind::VK_RValue);
@@ -5941,7 +5968,8 @@ void Sema::ActOnFinishedFunctionDefinitionInOpenMPDeclareVariantScope(
OMPDeclareVariantScope &DVScope = OMPDeclareVariantScopes.back();
auto *OMPDeclareVariantA = OMPDeclareVariantAttr::CreateImplicit(
Context, VariantFuncRef, DVScope.TI);
- BaseFD->addAttr(OMPDeclareVariantA);
+ for (FunctionDecl *BaseFD : Bases)
+ BaseFD->addAttr(OMPDeclareVariantA);
}
ExprResult Sema::ActOnOpenMPCall(ExprResult Call, Scope *Scope,
@@ -6129,7 +6157,7 @@ Sema::checkOpenMPDeclareVariantFunction(Sema::DeclGroupPtrTy DG,
// Convert VariantRef expression to the type of the original function to
// resolve possible conflicts.
- ExprResult VariantRefCast;
+ ExprResult VariantRefCast = VariantRef;
if (LangOpts.CPlusPlus) {
QualType FnPtrType;
auto *Method = dyn_cast<CXXMethodDecl>(FD);
@@ -6154,25 +6182,27 @@ Sema::checkOpenMPDeclareVariantFunction(Sema::DeclGroupPtrTy DG,
} else {
FnPtrType = Context.getPointerType(FD->getType());
}
- ImplicitConversionSequence ICS =
- TryImplicitConversion(VariantRef, FnPtrType.getUnqualifiedType(),
- /*SuppressUserConversions=*/false,
- AllowedExplicit::None,
- /*InOverloadResolution=*/false,
- /*CStyle=*/false,
- /*AllowObjCWritebackConversion=*/false);
- if (ICS.isFailure()) {
- Diag(VariantRef->getExprLoc(),
- diag::err_omp_declare_variant_incompat_types)
- << VariantRef->getType()
- << ((Method && !Method->isStatic()) ? FnPtrType : FD->getType())
- << VariantRef->getSourceRange();
- return None;
+ QualType VarianPtrType = Context.getPointerType(VariantRef->getType());
+ if (VarianPtrType.getUnqualifiedType() != FnPtrType.getUnqualifiedType()) {
+ ImplicitConversionSequence ICS = TryImplicitConversion(
+ VariantRef, FnPtrType.getUnqualifiedType(),
+ /*SuppressUserConversions=*/false, AllowedExplicit::None,
+ /*InOverloadResolution=*/false,
+ /*CStyle=*/false,
+ /*AllowObjCWritebackConversion=*/false);
+ if (ICS.isFailure()) {
+ Diag(VariantRef->getExprLoc(),
+ diag::err_omp_declare_variant_incompat_types)
+ << VariantRef->getType()
+ << ((Method && !Method->isStatic()) ? FnPtrType : FD->getType())
+ << VariantRef->getSourceRange();
+ return None;
+ }
+ VariantRefCast = PerformImplicitConversion(
+ VariantRef, FnPtrType.getUnqualifiedType(), AA_Converting);
+ if (!VariantRefCast.isUsable())
+ return None;
}
- VariantRefCast = PerformImplicitConversion(
- VariantRef, FnPtrType.getUnqualifiedType(), AA_Converting);
- if (!VariantRefCast.isUsable())
- return None;
// Drop previously built artificial addr_of unary op for member functions.
if (Method && !Method->isStatic()) {
Expr *PossibleAddrOfVariantRef = VariantRefCast.get();
@@ -6180,8 +6210,6 @@ Sema::checkOpenMPDeclareVariantFunction(Sema::DeclGroupPtrTy DG,
PossibleAddrOfVariantRef->IgnoreImplicit()))
VariantRefCast = UO->getSubExpr();
}
- } else {
- VariantRefCast = VariantRef;
}
ExprResult ER = CheckPlaceholderExpr(VariantRefCast.get());
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index a5100dc99fcd..921d94036a2c 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -417,7 +417,9 @@ static void instantiateOMPDeclareVariantAttr(
if (TI.anyScoreOrCondition(SubstScoreOrConditionExpr))
return;
- // Check function/variant ref.
+ Expr *E = VariantFuncRef.get();
+ // Check function/variant ref for `omp declare variant` but not for `omp
+ // begin declare variant` (which use implicit attributes).
Optional<std::pair<FunctionDecl *, Expr *>> DeclVarData =
S.checkOpenMPDeclareVariantFunction(S.ConvertDeclToDeclGroup(New),
VariantFuncRef.get(), TI,
@@ -426,9 +428,36 @@ static void instantiateOMPDeclareVariantAttr(
if (!DeclVarData)
return;
- S.ActOnOpenMPDeclareVariantDirective(DeclVarData.getValue().first,
- DeclVarData.getValue().second, TI,
- Attr.getRange());
+ E = DeclVarData.getValue().second;
+ FD = DeclVarData.getValue().first;
+
+ if (auto *VariantDRE = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts())) {
+ if (auto *VariantFD = dyn_cast<FunctionDecl>(VariantDRE->getDecl())) {
+ if (auto *VariantFTD = VariantFD->getDescribedFunctionTemplate()) {
+ if (!VariantFTD->isThisDeclarationADefinition())
+ return;
+ Sema::TentativeAnalysisScope Trap(S);
+ const TemplateArgumentList *TAL = TemplateArgumentList::CreateCopy(
+ S.Context, TemplateArgs.getInnermost());
+
+ auto *SubstFD = S.InstantiateFunctionDeclaration(VariantFTD, TAL,
+ New->getLocation());
+ if (!SubstFD)
+ return;
+ S.InstantiateFunctionDefinition(
+ New->getLocation(), SubstFD, /* Recursive */ true,
+ /* DefinitionRequired */ false, /* AtEndOfTU */ false);
+ SubstFD->setInstantiationIsPending(!SubstFD->isDefined());
+ E = DeclRefExpr::Create(S.Context, NestedNameSpecifierLoc(),
+ SourceLocation(), SubstFD,
+ /* RefersToEnclosingVariableOrCapture */ false,
+ /* NameLoc */ SubstFD->getLocation(),
+ SubstFD->getType(), ExprValueKind::VK_RValue);
+ }
+ }
+ }
+
+ S.ActOnOpenMPDeclareVariantDirective(FD, E, TI, Attr.getRange());
}
static void instantiateDependentAMDGPUFlatWorkGroupSizeAttr(
diff --git a/clang/test/AST/ast-dump-openmp-begin-declare-variant_template_2.cpp b/clang/test/AST/ast-dump-openmp-begin-declare-variant_template_2.cpp
new file mode 100644
index 000000000000..9613e8663492
--- /dev/null
+++ b/clang/test/AST/ast-dump-openmp-begin-declare-variant_template_2.cpp
@@ -0,0 +1,264 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fopenmp -verify -ast-dump %s -x c++ | FileCheck %s
+// expected-no-diagnostics
+
+template <typename T>
+int also_before(T) {
+ return 1;
+}
+template <int V>
+int also_before_mismatch(void) {
+ return 0;
+}
+int also_before_non_template(void) {
+ return 0;
+}
+
+#pragma omp begin declare variant match(implementation = {extension(allow_templates)})
+template <typename T>
+int also_before(T) {
+ return 0;
+}
+template <typename T>
+int also_after(T) {
+ return 0;
+}
+template <typename T, typename Q>
+int also_after_mismatch(T, Q) {
+ return 2;
+}
+template <typename T>
+int also_before_mismatch(T) {
+ return 3;
+}
+template <typename T>
+int also_before_non_template(T) {
+ return 4;
+}
+template <int V>
+int only_def(void) {
+ return 0;
+}
+#pragma omp end declare variant
+
+template <typename T>
+int also_after(T) {
+ return 6;
+}
+template <typename T>
+int also_after_mismatch(T) {
+ return 0;
+}
+
+int test() {
+ // Should return 0.
+ return also_before(0.) + also_before_mismatch<0>() + also_before_non_template() + also_after<char>(0) + also_after_mismatch(0) + only_def<0>();
+}
+
+// CHECK: |-FunctionTemplateDecl [[ADDR_0:0x[a-z0-9]*]] <{{.*}}, line:7:1> line:5:5 also_before
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_1:0x[a-z0-9]*]] <line:4:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_2:0x[a-z0-9]*]] <line:5:1, line:7:1> line:5:5 also_before 'int (T)'
+// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_3:0x[a-z0-9]*]] <col:17> col:18 'T'
+// CHECK-NEXT: | | |-CompoundStmt [[ADDR_4:0x[a-z0-9]*]] <col:20, line:7:1>
+// CHECK-NEXT: | | | `-ReturnStmt [[ADDR_5:0x[a-z0-9]*]] <line:6:3, col:10>
+// CHECK-NEXT: | | | `-IntegerLiteral [[ADDR_6:0x[a-z0-9]*]] <col:10> 'int' 1
+// CHECK-NEXT: | | `-OMPDeclareVariantAttr [[ADDR_7:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_8:0x[a-z0-9]*]] <line:18:1> 'int (T)' {{.*}}Function [[ADDR_9:0x[a-z0-9]*]] 'also_before[implementation={extension(allow_templates)}]' 'int (T)'
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_10:0x[a-z0-9]*]] <line:5:1, line:7:1> line:5:5 used also_before 'int (double)'
+// CHECK-NEXT: | |-TemplateArgument type 'double'
+// CHECK-NEXT: | | `-BuiltinType [[ADDR_11:0x[a-z0-9]*]] 'double'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_12:0x[a-z0-9]*]] <col:17> col:18 'double':'double'
+// CHECK-NEXT: | |-CompoundStmt [[ADDR_13:0x[a-z0-9]*]] <col:20, line:7:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_14:0x[a-z0-9]*]] <line:6:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_6]] <col:10> 'int' 1
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_15:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_16:0x[a-z0-9]*]] <line:18:1> 'int (double)' {{.*}}Function [[ADDR_17:0x[a-z0-9]*]] 'also_before[implementation={extension(allow_templates)}]' 'int (double)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_18:0x[a-z0-9]*]] <line:8:1, line:11:1> line:9:5 also_before_mismatch
+// CHECK-NEXT: | |-NonTypeTemplateParmDecl [[ADDR_19:0x[a-z0-9]*]] <line:8:11, col:15> col:15 'int' depth 0 index 0 V
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_20:0x[a-z0-9]*]] <line:9:1, line:11:1> line:9:5 also_before_mismatch 'int ({{.*}})'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_21:0x[a-z0-9]*]] <col:32, line:11:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_22:0x[a-z0-9]*]] <line:10:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_23:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_24:0x[a-z0-9]*]] <line:9:1, line:11:1> line:9:5 used also_before_mismatch 'int ({{.*}})'
+// CHECK-NEXT: | |-TemplateArgument integral 0
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_25:0x[a-z0-9]*]] <col:32, line:11:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_26:0x[a-z0-9]*]] <line:10:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_23]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionDecl [[ADDR_27:0x[a-z0-9]*]] <line:12:1, line:14:1> line:12:5 used also_before_non_template 'int ({{.*}})'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_28:0x[a-z0-9]*]] <col:36, line:14:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_29:0x[a-z0-9]*]] <line:13:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_30:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_31:0x[a-z0-9]*]] <line:17:1, line:20:1> line:18:1 also_before[implementation={extension(allow_templates)}]
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_32:0x[a-z0-9]*]] <line:17:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_9]] <line:18:1, line:20:1> line:18:1 referenced also_before[implementation={extension(allow_templates)}] 'int (T)'
+// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_33:0x[a-z0-9]*]] <col:17> col:18 'T'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_34:0x[a-z0-9]*]] <col:20, line:20:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_35:0x[a-z0-9]*]] <line:19:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_36:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_17]] <line:18:1, line:20:1> line:18:1 also_before[implementation={extension(allow_templates)}] 'int (double)'
+// CHECK-NEXT: | |-TemplateArgument type 'double'
+// CHECK-NEXT: | | `-BuiltinType [[ADDR_11]] 'double'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_37:0x[a-z0-9]*]] <col:17> col:18 'double':'double'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_38:0x[a-z0-9]*]] <col:20, line:20:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_39:0x[a-z0-9]*]] <line:19:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_36]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_40:0x[a-z0-9]*]] <line:21:1, line:22:17> col:5 implicit also_after
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_41:0x[a-z0-9]*]] <line:21:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_42:0x[a-z0-9]*]] <line:22:1, col:17> col:5 also_after 'int (T)'
+// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_43:0x[a-z0-9]*]] <col:16> col:17 'T'
+// CHECK-NEXT: | | `-OMPDeclareVariantAttr [[ADDR_44:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_45:0x[a-z0-9]*]] <col:1> 'int (T)' {{.*}}Function [[ADDR_46:0x[a-z0-9]*]] 'also_after[implementation={extension(allow_templates)}]' 'int (T)'
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_47:0x[a-z0-9]*]] <line:44:1, line:46:1> line:44:5 used also_after 'int (char)'
+// CHECK-NEXT: | |-TemplateArgument type 'char'
+// CHECK-NEXT: | | `-BuiltinType [[ADDR_48:0x[a-z0-9]*]] 'char'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_49:0x[a-z0-9]*]] <col:16> col:17 'char':'char'
+// CHECK-NEXT: | |-CompoundStmt [[ADDR_50:0x[a-z0-9]*]] <col:19, line:46:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_51:0x[a-z0-9]*]] <line:45:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_52:0x[a-z0-9]*]] <col:10> 'int' 6
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_53:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_54:0x[a-z0-9]*]] <line:22:1> 'int (char)' {{.*}}Function [[ADDR_55:0x[a-z0-9]*]] 'also_after[implementation={extension(allow_templates)}]' 'int (char)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_56:0x[a-z0-9]*]] <line:21:1, line:24:1> line:22:1 also_after[implementation={extension(allow_templates)}]
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_41]] <line:21:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_46]] <line:22:1, line:24:1> line:22:1 referenced also_after[implementation={extension(allow_templates)}] 'int (T)'
+// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_43]] <col:16> col:17 'T'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_57:0x[a-z0-9]*]] <col:19, line:24:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_58:0x[a-z0-9]*]] <line:23:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_59:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_55]] <line:22:1, line:24:1> line:22:1 also_after[implementation={extension(allow_templates)}] 'int (char)'
+// CHECK-NEXT: | |-TemplateArgument type 'char'
+// CHECK-NEXT: | | `-BuiltinType [[ADDR_48]] 'char'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_60:0x[a-z0-9]*]] <col:16> col:17 'char':'char'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_61:0x[a-z0-9]*]] <col:19, line:24:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_62:0x[a-z0-9]*]] <line:23:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_59]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_63:0x[a-z0-9]*]] <line:25:1, line:26:29> col:5 implicit also_after_mismatch
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_64:0x[a-z0-9]*]] <line:25:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_65:0x[a-z0-9]*]] <col:23, col:32> col:32 referenced typename depth 0 index 1 Q
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_66:0x[a-z0-9]*]] <line:26:1, col:29> col:5 also_after_mismatch 'int (T, Q)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_67:0x[a-z0-9]*]] <col:25> col:26 'T'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_68:0x[a-z0-9]*]] <col:28> col:29 'Q'
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_69:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_70:0x[a-z0-9]*]] <col:1> 'int (T, Q)' {{.*}}Function [[ADDR_71:0x[a-z0-9]*]] 'also_after_mismatch[implementation={extension(allow_templates)}]' 'int (T, Q)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_72:0x[a-z0-9]*]] <line:25:1, line:28:1> line:26:1 also_after_mismatch[implementation={extension(allow_templates)}]
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_64]] <line:25:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_65]] <col:23, col:32> col:32 referenced typename depth 0 index 1 Q
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_71]] <line:26:1, line:28:1> line:26:1 also_after_mismatch[implementation={extension(allow_templates)}] 'int (T, Q)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_67]] <col:25> col:26 'T'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_68]] <col:28> col:29 'Q'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_73:0x[a-z0-9]*]] <col:31, line:28:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_74:0x[a-z0-9]*]] <line:27:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_75:0x[a-z0-9]*]] <col:10> 'int' 2
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_76:0x[a-z0-9]*]] <line:29:1, line:30:27> col:5 implicit also_before_mismatch
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_77:0x[a-z0-9]*]] <line:29:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_78:0x[a-z0-9]*]] <line:30:1, col:27> col:5 also_before_mismatch 'int (T)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_79:0x[a-z0-9]*]] <col:26> col:27 'T'
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_80:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_81:0x[a-z0-9]*]] <col:1> 'int (T)' {{.*}}Function [[ADDR_82:0x[a-z0-9]*]] 'also_before_mismatch[implementation={extension(allow_templates)}]' 'int (T)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_83:0x[a-z0-9]*]] <line:29:1, line:32:1> line:30:1 also_before_mismatch[implementation={extension(allow_templates)}]
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_77]] <line:29:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_82]] <line:30:1, line:32:1> line:30:1 also_before_mismatch[implementation={extension(allow_templates)}] 'int (T)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_79]] <col:26> col:27 'T'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_84:0x[a-z0-9]*]] <col:29, line:32:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_85:0x[a-z0-9]*]] <line:31:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_86:0x[a-z0-9]*]] <col:10> 'int' 3
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_87:0x[a-z0-9]*]] <line:33:1, line:34:31> col:5 implicit also_before_non_template
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_88:0x[a-z0-9]*]] <line:33:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_89:0x[a-z0-9]*]] <line:34:1, col:31> col:5 also_before_non_template 'int (T)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_90:0x[a-z0-9]*]] <col:30> col:31 'T'
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_91:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_92:0x[a-z0-9]*]] <col:1> 'int (T)' {{.*}}Function [[ADDR_93:0x[a-z0-9]*]] 'also_before_non_template[implementation={extension(allow_templates)}]' 'int (T)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_94:0x[a-z0-9]*]] <line:33:1, line:36:1> line:34:1 also_before_non_template[implementation={extension(allow_templates)}]
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_88]] <line:33:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_93]] <line:34:1, line:36:1> line:34:1 also_before_non_template[implementation={extension(allow_templates)}] 'int (T)'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_90]] <col:30> col:31 'T'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_95:0x[a-z0-9]*]] <col:33, line:36:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_96:0x[a-z0-9]*]] <line:35:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_97:0x[a-z0-9]*]] <col:10> 'int' 4
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_98:0x[a-z0-9]*]] <line:37:1, line:38:18> col:5 implicit only_def
+// CHECK-NEXT: | |-NonTypeTemplateParmDecl [[ADDR_99:0x[a-z0-9]*]] <line:37:11, col:15> col:15 'int' depth 0 index 0 V
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_100:0x[a-z0-9]*]] <line:38:1, col:18> col:5 only_def 'int ({{.*}})'
+// CHECK-NEXT: | | `-OMPDeclareVariantAttr [[ADDR_101:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_102:0x[a-z0-9]*]] <col:1> 'int ({{.*}})' {{.*}}Function [[ADDR_103:0x[a-z0-9]*]] 'only_def[implementation={extension(allow_templates)}]' 'int ({{.*}})'
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_104:0x[a-z0-9]*]] <col:1, col:18> col:5 used only_def 'int ({{.*}})'
+// CHECK-NEXT: | |-TemplateArgument integral 0
+// CHECK-NEXT: | `-OMPDeclareVariantAttr [[ADDR_105:0x[a-z0-9]*]] <<invalid sloc>> Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_106:0x[a-z0-9]*]] <col:1> 'int ({{.*}})' {{.*}}Function [[ADDR_107:0x[a-z0-9]*]] 'only_def[implementation={extension(allow_templates)}]' 'int ({{.*}})'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_108:0x[a-z0-9]*]] <line:37:1, line:40:1> line:38:1 only_def[implementation={extension(allow_templates)}]
+// CHECK-NEXT: | |-NonTypeTemplateParmDecl [[ADDR_99]] <line:37:11, col:15> col:15 'int' depth 0 index 0 V
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_103]] <line:38:1, line:40:1> line:38:1 referenced only_def[implementation={extension(allow_templates)}] 'int ({{.*}})'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_109:0x[a-z0-9]*]] <col:20, line:40:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_110:0x[a-z0-9]*]] <line:39:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_111:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_107]] <line:38:1, line:40:1> line:38:1 only_def[implementation={extension(allow_templates)}] 'int ({{.*}})'
+// CHECK-NEXT: | |-TemplateArgument integral 0
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_112:0x[a-z0-9]*]] <col:20, line:40:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_113:0x[a-z0-9]*]] <line:39:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_111]] <col:10> 'int' 0
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_114:0x[a-z0-9]*]] prev [[ADDR_40]] <line:43:1, line:46:1> line:44:5 also_after
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_115:0x[a-z0-9]*]] <line:43:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_116:0x[a-z0-9]*]] prev [[ADDR_42]] <line:44:1, line:46:1> line:44:5 also_after 'int (T)'
+// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_117:0x[a-z0-9]*]] <col:16> col:17 'T'
+// CHECK-NEXT: | | |-CompoundStmt [[ADDR_118:0x[a-z0-9]*]] <col:19, line:46:1>
+// CHECK-NEXT: | | | `-ReturnStmt [[ADDR_119:0x[a-z0-9]*]] <line:45:3, col:10>
+// CHECK-NEXT: | | | `-IntegerLiteral [[ADDR_52]] <col:10> 'int' 6
+// CHECK-NEXT: | | `-OMPDeclareVariantAttr [[ADDR_120:0x[a-z0-9]*]] <<invalid sloc>> Inherited Implicit implementation={extension(allow_templates)}
+// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_45]] <line:22:1> 'int (T)' {{.*}}Function [[ADDR_46]] 'also_after[implementation={extension(allow_templates)}]' 'int (T)'
+// CHECK-NEXT: | `-Function [[ADDR_47]] 'also_after' 'int (char)'
+// CHECK-NEXT: |-FunctionTemplateDecl [[ADDR_121:0x[a-z0-9]*]] <line:47:1, line:50:1> line:48:5 also_after_mismatch
+// CHECK-NEXT: | |-TemplateTypeParmDecl [[ADDR_122:0x[a-z0-9]*]] <line:47:11, col:20> col:20 referenced typename depth 0 index 0 T
+// CHECK-NEXT: | |-FunctionDecl [[ADDR_123:0x[a-z0-9]*]] <line:48:1, line:50:1> line:48:5 also_after_mismatch 'int (T)'
+// CHECK-NEXT: | | |-ParmVarDecl [[ADDR_124:0x[a-z0-9]*]] <col:25> col:26 'T'
+// CHECK-NEXT: | | `-CompoundStmt [[ADDR_125:0x[a-z0-9]*]] <col:28, line:50:1>
+// CHECK-NEXT: | | `-ReturnStmt [[ADDR_126:0x[a-z0-9]*]] <line:49:3, col:10>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_127:0x[a-z0-9]*]] <col:10> 'int' 0
+// CHECK-NEXT: | `-FunctionDecl [[ADDR_128:0x[a-z0-9]*]] <line:48:1, line:50:1> line:48:5 used also_after_mismatch 'int (int)'
+// CHECK-NEXT: | |-TemplateArgument type 'int'
+// CHECK-NEXT: | | `-BuiltinType [[ADDR_129:0x[a-z0-9]*]] 'int'
+// CHECK-NEXT: | |-ParmVarDecl [[ADDR_130:0x[a-z0-9]*]] <col:25> col:26 'int':'int'
+// CHECK-NEXT: | `-CompoundStmt [[ADDR_131:0x[a-z0-9]*]] <col:28, line:50:1>
+// CHECK-NEXT: | `-ReturnStmt [[ADDR_132:0x[a-z0-9]*]] <line:49:3, col:10>
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_127]] <col:10> 'int' 0
+// CHECK-NEXT: `-FunctionDecl [[ADDR_133:0x[a-z0-9]*]] <line:52:1, line:55:1> line:52:5 test 'int ({{.*}})'
+// CHECK-NEXT: `-CompoundStmt [[ADDR_134:0x[a-z0-9]*]] <col:12, line:55:1>
+// CHECK-NEXT: `-ReturnStmt [[ADDR_135:0x[a-z0-9]*]] <line:54:3, col:144>
+// CHECK-NEXT: `-BinaryOperator [[ADDR_136:0x[a-z0-9]*]] <col:10, col:144> 'int' '+'
+// CHECK-NEXT: |-BinaryOperator [[ADDR_137:0x[a-z0-9]*]] <col:10, col:128> 'int' '+'
+// CHECK-NEXT: | |-BinaryOperator [[ADDR_138:0x[a-z0-9]*]] <col:10, col:103> 'int' '+'
+// CHECK-NEXT: | | |-BinaryOperator [[ADDR_139:0x[a-z0-9]*]] <col:10, col:81> 'int' '+'
+// CHECK-NEXT: | | | |-BinaryOperator [[ADDR_140:0x[a-z0-9]*]] <col:10, col:52> 'int' '+'
+// CHECK-NEXT: | | | | |-PseudoObjectExpr [[ADDR_141:0x[a-z0-9]*]] <col:10, col:24> 'int'
+// CHECK-NEXT: | | | | | |-CallExpr [[ADDR_142:0x[a-z0-9]*]] <col:10, col:24> 'int'
+// CHECK-NEXT: | | | | | | |-ImplicitCastExpr [[ADDR_143:0x[a-z0-9]*]] <col:10> 'int (*)(double)' <FunctionToPointerDecay>
+// CHECK-NEXT: | | | | | | | `-DeclRefExpr [[ADDR_144:0x[a-z0-9]*]] <col:10> 'int (double)' {{.*}}Function [[ADDR_10]] 'also_before' 'int (double)' (FunctionTemplate [[ADDR_0]] 'also_before')
+// CHECK-NEXT: | | | | | | `-FloatingLiteral [[ADDR_145:0x[a-z0-9]*]] <col:22> 'double' 0.000000e+00
+// CHECK-NEXT: | | | | | `-CallExpr [[ADDR_146:0x[a-z0-9]*]] <line:18:1, line:54:24> 'int'
+// CHECK-NEXT: | | | | | |-ImplicitCastExpr [[ADDR_147:0x[a-z0-9]*]] <line:18:1> 'int (*)(double)' <FunctionToPointerDecay>
+// CHECK-NEXT: | | | | | | `-DeclRefExpr [[ADDR_16]] <col:1> 'int (double)' {{.*}}Function [[ADDR_17]] 'also_before[implementation={extension(allow_templates)}]' 'int (double)'
+// CHECK-NEXT: | | | | | `-FloatingLiteral [[ADDR_145]] <line:54:22> 'double' 0.000000e+00
+// CHECK-NEXT: | | | | `-CallExpr [[ADDR_148:0x[a-z0-9]*]] <col:28, col:52> 'int'
+// CHECK-NEXT: | | | | `-ImplicitCastExpr [[ADDR_149:0x[a-z0-9]*]] <col:28, col:50> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT: | | | | `-DeclRefExpr [[ADDR_150:0x[a-z0-9]*]] <col:28, col:50> 'int ({{.*}})' {{.*}}Function [[ADDR_24]] 'also_before_mismatch' 'int ({{.*}})' (FunctionTemplate [[ADDR_18]] 'also_before_mismatch')
+// CHECK-NEXT: | | | `-CallExpr [[ADDR_151:0x[a-z0-9]*]] <col:56, col:81> 'int'
+// CHECK-NEXT: | | | `-ImplicitCastExpr [[ADDR_152:0x[a-z0-9]*]] <col:56> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT: | | | `-DeclRefExpr [[ADDR_153:0x[a-z0-9]*]] <col:56> 'int ({{.*}})' {{.*}}Function [[ADDR_27]] 'also_before_non_template' 'int ({{.*}})'
+// CHECK-NEXT: | | `-PseudoObjectExpr [[ADDR_154:0x[a-z0-9]*]] <col:85, col:103> 'int'
+// CHECK-NEXT: | | |-CallExpr [[ADDR_155:0x[a-z0-9]*]] <col:85, col:103> 'int'
+// CHECK-NEXT: | | | |-ImplicitCastExpr [[ADDR_156:0x[a-z0-9]*]] <col:85, col:100> 'int (*)(char)' <FunctionToPointerDecay>
+// CHECK-NEXT: | | | | `-DeclRefExpr [[ADDR_157:0x[a-z0-9]*]] <col:85, col:100> 'int (char)' {{.*}}Function [[ADDR_47]] 'also_after' 'int (char)' (FunctionTemplate [[ADDR_114]] 'also_after')
+// CHECK-NEXT: | | | `-ImplicitCastExpr [[ADDR_158:0x[a-z0-9]*]] <col:102> 'char':'char' <IntegralCast>
+// CHECK-NEXT: | | | `-IntegerLiteral [[ADDR_159:0x[a-z0-9]*]] <col:102> 'int' 0
+// CHECK-NEXT: | | `-CallExpr [[ADDR_160:0x[a-z0-9]*]] <line:22:1, line:54:103> 'int'
+// CHECK-NEXT: | | |-ImplicitCastExpr [[ADDR_161:0x[a-z0-9]*]] <line:22:1> 'int (*)(char)' <FunctionToPointerDecay>
+// CHECK-NEXT: | | | `-DeclRefExpr [[ADDR_54]] <col:1> 'int (char)' {{.*}}Function [[ADDR_55]] 'also_after[implementation={extension(allow_templates)}]' 'int (char)'
+// CHECK-NEXT: | | `-ImplicitCastExpr [[ADDR_162:0x[a-z0-9]*]] <line:54:102> 'char':'char' <IntegralCast>
+// CHECK-NEXT: | | `-IntegerLiteral [[ADDR_159]] <col:102> 'int' 0
+// CHECK-NEXT: | `-CallExpr [[ADDR_163:0x[a-z0-9]*]] <col:107, col:128> 'int'
+// CHECK-NEXT: | |-ImplicitCastExpr [[ADDR_164:0x[a-z0-9]*]] <col:107> 'int (*)(int)' <FunctionToPointerDecay>
+// CHECK-NEXT: | | `-DeclRefExpr [[ADDR_165:0x[a-z0-9]*]] <col:107> 'int (int)' {{.*}}Function [[ADDR_128]] 'also_after_mismatch' 'int (int)' (FunctionTemplate [[ADDR_121]] 'also_after_mismatch')
+// CHECK-NEXT: | `-IntegerLiteral [[ADDR_166:0x[a-z0-9]*]] <col:127> 'int' 0
+// CHECK-NEXT: `-PseudoObjectExpr [[ADDR_167:0x[a-z0-9]*]] <col:132, col:144> 'int'
+// CHECK-NEXT: |-CallExpr [[ADDR_168:0x[a-z0-9]*]] <col:132, col:144> 'int'
+// CHECK-NEXT: | `-ImplicitCastExpr [[ADDR_169:0x[a-z0-9]*]] <col:132, col:142> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT: | `-DeclRefExpr [[ADDR_170:0x[a-z0-9]*]] <col:132, col:142> 'int ({{.*}})' {{.*}}Function [[ADDR_104]] 'only_def' 'int ({{.*}})' (FunctionTemplate [[ADDR_98]] 'only_def')
+// CHECK-NEXT: `-CallExpr [[ADDR_171:0x[a-z0-9]*]] <line:38:1, line:54:144> 'int'
+// CHECK-NEXT: `-ImplicitCastExpr [[ADDR_172:0x[a-z0-9]*]] <line:38:1> 'int (*)({{.*}})' <FunctionToPointerDecay>
+// CHECK-NEXT: `-DeclRefExpr [[ADDR_106]] <col:1> 'int ({{.*}})' {{.*}}Function [[ADDR_107]] 'only_def[implementation={extension(allow_templates)}]' 'int ({{.*}})'
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def b/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
index 821362c35826..1b39fff3edec 100644
--- a/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
+++ b/llvm/include/llvm/Frontend/OpenMP/OMPKinds.def
@@ -1119,6 +1119,7 @@ __OMP_TRAIT_PROPERTY(implementation, extension, match_all)
__OMP_TRAIT_PROPERTY(implementation, extension, match_any)
__OMP_TRAIT_PROPERTY(implementation, extension, match_none)
__OMP_TRAIT_PROPERTY(implementation, extension, disable_implicit_base)
+__OMP_TRAIT_PROPERTY(implementation, extension, allow_templates)
__OMP_TRAIT_SET(user)
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