On 04/02/19 12:13 +0100, Florian Weimer wrote:
* Richard Henderson:
Therefore, I've created small out-of-line helpers that are directly
linked into every library or executable that requires them. There
will be two direct branches, both of which will be well-predicted.
This work inspired me to put together something that provides a similar
hidden variable, comparable to __aa64_have_atomics, to libc_nonshared.a
in glibc:
<https://sourceware.org/ml/libc-alpha/2019-02/msg00073.html>
I hope it can be eventually be used to dynamically optimize the use of
atomics in the std::shared_ptr implementation in libstdc++.
This makes me very happy. Thanks, Florian!
For a generic optimization of all atomics, this is not suitable because
even a single-threaded process can have MAP_SHARED mappings and will
have to use atomics there.
Thanks,
Florian
