[all-commits] [llvm/llvm-project] e04d12: [libc++] Call basic_string_view's assume-valid con...

[Christopher Di Bella via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e04d124a96311d3714522125bf703950863e0540
      https://github.com/llvm/llvm-project/commit/e04d124a96311d3714522125bf703950863e0540
  Author: Christopher Di Bella <cjdb at google.com>
  Date:   2024-08-26 (Mon, 26 Aug 2024)

  Changed paths:
    M libcxx/include/string
    M libcxx/include/string_view

  Log Message:
  -----------
  [libc++] Call basic_string_view's assume-valid constructor from basic_string operations (#105863)

`basic_string` frequently calls `basic_string_view(data(), size())`,
which accounts for ~15% of the observed overhead when hardening is
enabled. This commit removes unnecessary checks when `basic_string` is
known to already have valid data, by bypassing the public constructor,
so that we eliminate that overhead.



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