Author: Haojian Wu Date: 2025-06-06T16:25:36+02:00 New Revision: b6364ab9558277e877b2da2dfdff36e805dafa8d
URL: https://github.com/llvm/llvm-project/commit/b6364ab9558277e877b2da2dfdff36e805dafa8d DIFF: https://github.com/llvm/llvm-project/commit/b6364ab9558277e877b2da2dfdff36e805dafa8d.diff LOG: [clang] Reduce TemplateDeclInstantiator size. (#142983) This gives us another ~1.85% improvement (1617->1647 for the `instantiation-depth-default.cpp`) on clang's template instantiation depths, No performance regressions have been observed: https://llvm-compile-time-tracker.com/compare.php?from=702e228249906d43687952d9a2f3d2f90d8024c6&to=61be4bfea92d52cfc3e48a3cabb1bc80cbebb7fa&stat=instructions:u Added: Modified: clang/include/clang/Sema/Template.h clang/lib/Sema/SemaTemplateInstantiateDecl.cpp Removed: ################################################################################ diff --git a/clang/include/clang/Sema/Template.h b/clang/include/clang/Sema/Template.h index af0c1e8506cf3..fe907078af275 100644 --- a/clang/include/clang/Sema/Template.h +++ b/clang/include/clang/Sema/Template.h @@ -587,16 +587,17 @@ enum class TemplateSubstitutionKind : char { /// specializations that will need to be instantiated after the /// enclosing class's instantiation is complete. SmallVector<std::pair<ClassTemplateDecl *, - ClassTemplatePartialSpecializationDecl *>, 4> - OutOfLinePartialSpecs; + ClassTemplatePartialSpecializationDecl *>, + 1> + OutOfLinePartialSpecs; /// A list of out-of-line variable template partial /// specializations that will need to be instantiated after the /// enclosing variable's instantiation is complete. /// FIXME: Verify that this is needed. SmallVector< - std::pair<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>, 4> - OutOfLineVarPartialSpecs; + std::pair<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>, 1> + OutOfLineVarPartialSpecs; public: TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner, diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp index b8e830cc30be1..57271415f838c 100644 --- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp +++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp @@ -2394,7 +2394,7 @@ Decl *TemplateDeclInstantiator::VisitVarTemplateDecl(VarTemplateDecl *D) { // Queue up any out-of-line partial specializations of this member // variable template; the client will force their instantiation once // the enclosing class has been instantiated. - SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs; + SmallVector<VarTemplatePartialSpecializationDecl *, 1> PartialSpecs; D->getPartialSpecializations(PartialSpecs); for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) if (PartialSpecs[I]->getFirstDecl()->isOutOfLine()) _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
