[all-commits] [llvm/llvm-project] 7ba045: Make basic_string::operator=() tail call properly

[Martijn Vels via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 7ba045a430b9e3812c20a941f45addac0fd6afd7
      https://github.com/llvm/llvm-project/commit/7ba045a430b9e3812c20a941f45addac0fd6afd7
  Author: Martijn Vels <mvels at google.com>
  Date:   2020-04-10 (Fri, 10 Apr 2020)

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

  Log Message:
  -----------
  Make basic_string::operator=() tail call properly

Summary: We discovered that the compiler may chose not to inline the operator=, which leads to an expensive extra stack frame. This change makes __assign_no_alias always tail called.

Reviewers: EricWF, #libc!

Subscribers: libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D77913