[all-commits] [llvm/llvm-project] d873af: [libc++] Optimize string copy construction (#222021)

[Nikolas Klauser via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d873afedebd0726700ba7f42a5d6e54dba288557
      https://github.com/llvm/llvm-project/commit/d873afedebd0726700ba7f42a5d6e54dba288557
  Author: Nikolas Klauser <nikolasklauser at berlin.de>
  Date:   2026-09-14 (Mon, 14 Sep 2026)

  Changed paths:
    M libcxx/include/CMakeLists.txt
    M libcxx/include/__assert
    A libcxx/include/__utility/assume.h
    M libcxx/include/module.modulemap.in
    M libcxx/include/string
    M libcxx/test/libcxx/assertions/single_expression.pass.cpp

  Log Message:
  -----------
  [libc++] Optimize string copy construction (#222021)

We know that the string size provided to `__init_copy_ctor_external` is
less than or equal to `max_size()`, so we don't need to do that check
again. Removing that check allows the compiler to ShrinkWrap the small
size path and also removes some unnecessary work in the allocating path.



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