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Subject: [Bug libstdc++/94295] use __builtin_operator_new and
 __builtin_operator_delete when available
Date: Thu, 22 Jul 2021 13:43:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94295

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:c9ca352186226ae757688e160e7c6f394c9f26aa

commit r12-2470-gc9ca352186226ae757688e160e7c6f394c9f26aa
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jul 22 14:38:34 2021 +0100

    libstdc++: Use __builtin_operator_new when available [PR94295]

    Clang provides __builtin_operator_new and __builtin_operator_delete,
    which have the same semantics as ::operator new and ::operator delete
    except that the compiler is allowed to elide calls to them. This changes
    std::allocator to use those built-in functions so that memory allocated
    by std::allocator can be optimized away when using Clang. This avoids an
    abstraction penalty for using std::allocator to allocate storage rather
    than a new-expression.

    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

    libstdc++-v3/ChangeLog:

            PR libstdc++/94295
            * include/ext/new_allocator.h (_GLIBCXX_OPERATOR_NEW)
            (_GLIBCXX_OPERATOR_DELETE, _GLIBCXX_SIZED_DEALLOC): Define.
            (allocator::allocate, allocator::deallocate): Use new macros.=