[all-commits] [llvm/llvm-project] f60788: [clang] Speedup LineOffsetMapping::get

[serge-sans-paille via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f607884a04b0ca06951227a01d00bc59b948d337
      https://github.com/llvm/llvm-project/commit/f607884a04b0ca06951227a01d00bc59b948d337
  Author: serge-sans-paille <sguelton at mozilla.com>
  Date:   2022-11-30 (Wed, 30 Nov 2022)

  Changed paths:
    M clang/lib/Basic/SourceManager.cpp

  Log Message:
  -----------
  [clang] Speedup LineOffsetMapping::get

LineOffsetMapping::get is a critical function that consistently appears
in the top 5 more computation intensive functions when running the
preprocessor.

This change brings consistent speedup of ~.5% on, preprocessing time,
see

https://llvm-compile-time-tracker.com/compare.php?from=0745b0c0354a0c8e1fefb68a3876d15db6c2e27a&to=460f3f04dac025e6952d78fce104a88151508a29&stat=instructions:u

for detailed statistics.

Differential Revision: https://reviews.llvm.org/D138474