[all-commits] [llvm/llvm-project] c42c7b: [clang][NFC] Skip macro source-location check for ...

[Anonmiraj via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c42c7b47a634ab3f4455b0e8b17f2bbc3be022af
      https://github.com/llvm/llvm-project/commit/c42c7b47a634ab3f4455b0e8b17f2bbc3be022af
  Author: Anonmiraj <ezzibrahimx at gmail.com>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M clang/lib/Lex/PPDirectives.cpp

  Log Message:
  -----------
  [clang][NFC] Skip macro source-location check for names that can't warn (#208862)

While profiling Linux headers, I noticed that
`Preprocessor::CheckMacroName` performs expensive source-location
queries for every macro, even when no diagnostic is possible. We can
avoid this overhead by only performing these checks when the macro name
is actually a reserved identifier or keyword, skipping them entirely for
ordinary macros.

|  | basket Ir |
| --- | --- |
| before | 10,690,004,315 |
| after | 10,649,181,540 |
| **Δ** | **−40.8M (−0.38%)** |

this is a follow up to #137306 and #139492



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