Jakub Jelinek <ja...@redhat.com> writes:
> On Fri, Nov 08, 2024 at 06:40:16PM +0100, Jakub Jelinek wrote:
>> clang++ adds __builtin_operator_{new,delete} builtins which as documented
>> work similarly to ::operator {new,delete}, except that it is an error
>> if the called ::operator {new,delete} is not a replaceable global operator
>> and allow optimizations which C++ normally allows just when those are used
>> from new/delete expressions https://eel.is/c++draft/expr.new#14
>> When using these builtins, the same optimizations can be done even when
>> using those builtins.
>>
>> For GCC we note that in the CALL_FROM_NEW_OR_DELETE_P flag on CALL_EXPRs.
>> The following patch implements it as a C++ FE keyword (because passing
>> references through ... changes the argument and so BUILT_IN_FRONTEND
>> builtin can't be used), just attempts to call the ::operator {new,delete}
>> and if it isn't replaceable, diagnoses it.
>>
>> So far lightly tested, ok for trunk if it passes bootstrap/regtest
>> (note, libstdc++ already uses the builtin)?
>
> Bootstrapped/regtested successfully on x86_64-linux and i686-linux.
Maybe tag PR110137 given it's very related (and of interest to people
CC'd on the bug).
>
> Jakub
