[all-commits] [llvm/llvm-project] 00f0c8: [Frontend] shrink in-memory PCH buffers to fit

[Sam McCall via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 00f0c805ff7c0b5780d651d273899abe977fdca7
      https://github.com/llvm/llvm-project/commit/00f0c805ff7c0b5780d651d273899abe977fdca7
  Author: Sam McCall <sam.mccall at gmail.com>
  Date:   2022-04-25 (Mon, 25 Apr 2022)

  Changed paths:
    M clang/lib/Frontend/PrecompiledPreamble.cpp

  Log Message:
  -----------
  [Frontend] shrink in-memory PCH buffers to fit

After building a PCH, the vector capacity is on average ~1/3 unused.
If we're going to keep it in memory for a while, reallocate to the right size.
Take care to do this once clang is destroyed so that we can reuse its
memory rather than requesting more.

Differential Revision: https://reviews.llvm.org/D124242