[all-commits] [llvm/llvm-project] 80e8ef: Use a fast path when initializing LineOffsetMapping

[serge-sans-paille via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 80e8efd563fda4d7b125b834d3243b3ef9a05270
      https://github.com/llvm/llvm-project/commit/80e8efd563fda4d7b125b834d3243b3ef9a05270
  Author: serge-sans-paille <sguelton at redhat.com>
  Date:   2021-03-01 (Mon, 01 Mar 2021)

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

  Log Message:
  -----------
  Use a fast path when initializing LineOffsetMapping

Use the fact that the number of line break is lower than printable characters to
guide the optimization process. Also use a fuzzy test that catches both \n and
\r in a single check to speedup the computation.

Differential Revision: https://reviews.llvm.org/D97320