[clang] 702e228 - [clang] Reduce LateInstantiatedAttrVec vector default size. (#142840)

[via cfe-commits]

Author: Haojian Wu
Date: 2025-06-05T15:14:25+02:00
New Revision: 702e228249906d43687952d9a2f3d2f90d8024c6

URL: https://github.com/llvm/llvm-project/commit/702e228249906d43687952d9a2f3d2f90d8024c6
DIFF: https://github.com/llvm/llvm-project/commit/702e228249906d43687952d9a2f3d2f90d8024c6.diff

LOG: [clang] Reduce LateInstantiatedAttrVec vector default size. (#142840)

This increases clang's template instantiation depths.

I can see 7% increase (1510 -> 1612 on my local machine) for the
`clang/test/SemaTemplate/instantiation-depth-default.cpp` case.

No performance regressions have been observed:
https://llvm-compile-time-tracker.com/compare.php?from=5f8cf33650c0c71119ecf81f07014329d9466d0d&to=05c2403b0f784325f5b88760ef43a15b6aaf4181&stat=instructions:u

Added: 
    

Modified: 
    clang/include/clang/Sema/Sema.h

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 65c84c0c40f60..f9a086b6966d9 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -14031,7 +14031,7 @@ class Sema final : public SemaBase {
                               Decl *D)
         : TmplAttr(A), Scope(S), NewDecl(D) {}
   };
-  typedef SmallVector<LateInstantiatedAttribute, 16> LateInstantiatedAttrVec;
+  typedef SmallVector<LateInstantiatedAttribute, 1> LateInstantiatedAttrVec;
 
   void InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
                         const Decl *Pattern, Decl *Inst,