[all-commits] [llvm/llvm-project] 3edcb8: Inline cached AST context lookup for declarations

[Mehdi Amini via All-commits]

  Branch: refs/heads/users/mamini/clang-speed-inline-ast-context
  Home:   https://github.com/llvm/llvm-project
  Commit: 3edcb8c335f3f319ad1eb88f8b5a14aa7d634ec1
      https://github.com/llvm/llvm-project/commit/3edcb8c335f3f319ad1eb88f8b5a14aa7d634ec1
  Author: Mehdi Amini <joker.eph at gmail.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

  Changed paths:
    M clang/include/clang/AST/DeclBase.h
    M clang/lib/AST/DeclBase.cpp

  Log Message:
  -----------
  Inline cached AST context lookup for declarations

Route declaration context queries through the cached DeclContext path.
Define the common path inline to avoid walking to the translation unit
and remove a hot out-of-line call.

The following measurements used the original relationship-cache parent,
before its cache-invalidation fixes.
CTMark O0 (3 samples, CPU 6): 29.239400 s -> 28.975433 s (-0.903%).

Impact on significant TUs in MLIR build time:
- `mlir/lib/RegisterAllDialects.cpp`: 2.4845% fewer retired
  instructions.
- `mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp`: 1.4241% fewer retired
  instructions.

Assisted-by: Codex



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