[all-commits] [llvm/llvm-project] cc860d: Cache the most recent diagnostic source file

[Mehdi Amini via All-commits]

  Branch: refs/heads/users/mamini/clang-speed-diagnostic-file-cache
  Home:   https://github.com/llvm/llvm-project
  Commit: cc860d83cc45b6be8e037e72a747a4755303a5b4
      https://github.com/llvm/llvm-project/commit/cc860d83cc45b6be8e037e72a747a4755303a5b4
  Author: Mehdi Amini <joker.eph at gmail.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

  Changed paths:
    M clang/include/clang/Basic/Diagnostic.h
    M clang/lib/Basic/Diagnostic.cpp

  Log Message:
  -----------
  Cache the most recent diagnostic source file

Avoid repeated ordered-map lookups while diagnostics remain in the same
source file. Clear the cached map node whenever the map is reset.

CTMark O0 (3 samples, CPU 6): 29.439800 s -> 29.312967 s (-0.431%).

Impact on significant TUs in MLIR build time:
- `mlir/lib/RegisterAllDialects.cpp`: 1.0930% fewer retired
  instructions.
- `mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp`: 0.5034% fewer retired
  instructions.

Assisted-by: Codex



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