serge-sans-paille 95dd178483 [clang] Change representation of CurLexerKind (#70381) ...

Previous representation used an enumeration combined to a switch to
dispatch to the appropriate lexer.

Use function pointer so that the dispatching is just an indirect call,
which is actually better because lexing is a costly task compared to a
function call.

This also makes the code slightly cleaner, speedup on compile time
tracker are consistent and range form -0.05% to -0.20% for NewPM-O0-g,
see


https://llvm-compile-time-tracker.com/compare.php?from=f9906508bc4f05d3950e2219b4c56f6c078a61ef&to=608c85ec1283638db949d73e062bcc3355001ce4&stat=instructions:u

Considering just the preprocessing task, preprocessing the sqlite
amalgametion takes -0.6% instructions (according to valgrind
--tool=callgrind)

---------

Co-authored-by: serge-sans-paille <sguelton@mozilla.com>
Co-authored-by: cor3ntin <corentinjabot@gmail.com>

2023-11-06 07:13:05 +00:00

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