[all-commits] [llvm/llvm-project] b79bb2: Bypass setup for complete local DeclContext lookups

[Mehdi Amini via All-commits]

  Branch: refs/heads/users/mamini/clang-speed-declcontext-lookup
  Home:   https://github.com/llvm/llvm-project
  Commit: b79bb2af2d2216e6def1e2d8e4d0adbfff00339b
      https://github.com/llvm/llvm-project/commit/b79bb2af2d2216e6def1e2d8e4d0adbfff00339b
  Author: Mehdi Amini <joker.eph at gmail.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

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

  Log Message:
  -----------
  Bypass setup for complete local DeclContext lookups

Query an existing complete local lookup map directly. Preserve the full
primary-context and external-source path whenever lazy or external storage
can affect the result.

CTMark O0 (3 samples, CPU 6): 29.439800 s -> 29.268133 s (-0.583%).

Impact on significant TUs in MLIR build time:
- `mlir/lib/RegisterAllDialects.cpp`: 1.3266% fewer retired
  instructions.
- `mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp`: 0.4887% fewer retired
  instructions.

Assisted-by: Codex



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