alexfh wrote:
Compiling Clang with more debug information and without FDO+ThinLTO indeed
shows
`clang::serialization::MultiOnDiskHashTable<clang::serialization::reader::LazySpecializationInfoLookupTrait>::findAll()`
as the main time sink:
```
+ 96.99% 0.00% clang clang [.]
clang::Sema::runWithSufficientStackSpace(clang::SourceLocation,
llvm::function_ref<void ()>)
◆
+ 93.50% 0.00% clang clang [.]
clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*)
▒
+ 91.97% 0.00% clang clang [.]
clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation,
clang::FunctionDecl*, bool, bool, bool)
▒
+ 91.62% 0.00% clang clang [.]
clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*,
bool) ▒
+ 91.58% 0.00% clang clang [.]
clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList
const&)
▒
+ 91.12% 0.00% clang clang [.]
clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformUnresolvedLookupExpr(clang::UnresolvedLookupExpr*,
bool) ▒
+ 91.00% 0.00% clang clang [.]
clang::Sema::BuildTemplateIdExpr(clang::CXXScopeSpec const&,
clang::SourceLocation, clang::LookupResult&, bool,
clang::TemplateArgumentListInfo const*) ▒
+ 90.97% 1.27% clang clang [.]
clang::ASTReader::LoadExternalSpecializations(clang::Decl const*, bool)
▒
+ 90.69% 0.00% clang clang [.]
MarkExprReferenced(clang::Sema&, clang::SourceLocation, clang::Decl*,
clang::Expr*, bool, llvm::DenseMap<clang::VarDecl const*, int,
llvm::DenseMapInfo<clang:▒
+ 90.55% 0.00% clang clang [.]
clang::Sema::MarkDeclRefReferenced(clang::DeclRefExpr*, clang::Expr const*)
▒
+ 90.48% 0.00% clang clang [.]
clang::Sema::BuildDeclRefExpr(clang::ValueDecl*, clang::QualType,
clang::ExprValueKind, clang::DeclarationNameInfo const&,
clang::NestedNameSpecifierLoc, clan▒
+ 90.30% 0.00% clang clang [.]
clang::Sema::CheckVarTemplateId(clang::VarTemplateDecl*, clang::SourceLocation,
clang::SourceLocation, clang::TemplateArgumentListInfo const&) ▒
+ 90.24% 0.00% clang clang [.]
clang::Sema::InstantiateVariableInitializer(clang::VarDecl*, clang::VarDecl*,
clang::MultiLevelTemplateArgumentList const&)
▒
+ 90.04% 0.00% clang clang [.]
clang::Sema::SubstInitializer(clang::Expr*,
clang::MultiLevelTemplateArgumentList const&, bool)
▒
+ 89.47% 0.01% clang clang [.]
clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&,
clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::NamedDecl*,
clang::TemplateArgu▒
+ 89.47% 0.00% clang clang [.]
clang::VarTemplateDecl::getPartialSpecializations(llvm::SmallVectorImpl<clang::VarTemplatePartialSpecializationDecl*>&)
const ▒
- 89.35% 61.19% clang clang [.]
clang::serialization::MultiOnDiskHashTable<clang::serialization::reader::LazySpecializationInfoLookupTrait>::findAll()
▒
- 28.16%
clang::serialization::MultiOnDiskHashTable<clang::serialization::reader::LazySpecializationInfoLookupTrait>::findAll()
▒
- 20.71%
llvm::DenseMap<clang::serialization::reader::LazySpecializationInfo,
llvm::detail::DenseSetEmpty,
llvm::DenseMapInfo<clang::serialization::reader::LazySpecializationInfo, void>,
llvm::detail::DenseS▒
+ 0.82% 0xffffffff8b4012a6
▒
+ 7.26% llvm::SmallVectorBase<unsigned int>::grow_pod(void*, unsigned
long, unsigned long)
▒
- 14.45% clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformTemplateSpecializationType(clang::TypeLocBuilder&,
clang::TemplateSpecializationTypeLoc, clang::TemplateName) ▒
- 14.44% clang::Sema::CheckTemplateIdType(clang::TemplateName,
clang::SourceLocation, clang::TemplateArgumentListInfo&)
▒
clang::Sema::SubstType(clang::QualType,
clang::MultiLevelTemplateArgumentList const&, clang::SourceLocation,
clang::DeclarationName, bool*)
▒
+ clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformType(clang::TypeSourceInfo*)
▒
+ 13.46% clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*)
▒
+ 11.65% _start
▒
+ 11.18%
clang::TemplateDeclInstantiator::InstantiateTypedefNameDecl(clang::TypedefNameDecl*,
bool)
▒
+ 7.98% clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation,
clang::QualType, clang::Sema::CompleteTypeKind, clang::Sema::TypeDiagnoser*)
▒
+ 1.75% clang::TreeTransform<(anonymous
namespace)::TemplateInstantiator>::TransformTemplateSpecializationType(clang::TypeLocBuilder&,
clang::TemplateSpecializationTypeLoc) ▒
```
https://github.com/llvm/llvm-project/pull/83237
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