hiraditya added inline comments.
================
Comment at: libcxx/trunk/include/__split_buffer:201
__alloc_rr& __a = this->__alloc();
+ pointer __to_be_end = this->__end_;
do
----------------
danlark wrote:
> lichray wrote:
> > mclow.lists wrote:
> > > I have been asked specifically by the optimizer folks to NOT do things
> > > like this in libc++, but rather to file bugs against the optimizer.
> > >
> > > And I have done so for this exact case:
> > > https://bugs.llvm.org/show_bug.cgi?id=35637
> > From the thread I didn't see that the compiler side asked you not to do so.
> >
> > And I disagree with the view. libc++ shouldn't *wait* for compilers,
> > because we don't dictate users' compiler choices. This change doesn't make
> > libc++ worse to coming compilers, and makes libc++ better on existing
> > compilers, so what benefit we get by not approving this?
> So, what is the status? Are we waiting for the compiler code-gen fix?
>
> At Yandex we are using patched version like half a year or more.
>
> https://github.com/catboost/catboost/blob/master/contrib/libs/cxxsupp/libcxx/include/vector#L995
It would be great to get this patch in. Waiting for compiler for this
optimization seems overkill.
Repository:
rCXX libc++
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D44823/new/
https://reviews.llvm.org/D44823
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