Linux distro like
Fedora doesn't enable this, this is why we caught it.
The copy-and-clear test shows it improves by 50%.
Ran all testsuites on Linux-x64.
2016-09-13 Cong Wang
PR libstdc++/77582
* libstdc++-v3/include/bits/basic_string.h: Change inline to a declaration.
* libstdc
On Wed, Sep 14, 2016 at 4:06 AM, Jonathan Wakely wrote:
> On 13/09/16 11:02 -0700, Cong Wang wrote:
>>
>> In !_GLIBCXX_USE_CXX11_ABI implementation, string::clear() calls
>> _M_mutate(), which could allocate memory as we do COW. This hurts
>> performance when string:
On Wed, Sep 14, 2016 at 10:28 AM, Jonathan Wakely wrote:
> On 14/09/16 09:09 -0700, Cong Wang wrote:
>>
>> On Wed, Sep 14, 2016 at 4:06 AM, Jonathan Wakely
>> wrote:
>>>
>>> If I understand the purpose of the change correctly, it's similar to
&g
On Thu, Sep 15, 2016 at 2:08 AM, Jonathan Wakely wrote:
> On 14/09/16 10:41 -0700, Cong Wang wrote:
>>
>> For long term, I think gcc should have something as simple as
>> 'Signed-off-by' for Linux kernel, otherwise too much work for first-time
>> contributors
On Fri, Sep 23, 2016 at 10:25 AM, Jonathan Wakely wrote:
>
> I'm applying this patch, which is my one from 2014 with a check for
> whether the string is shared, so we just set the length to zero (and
> don't throw away reusable capacity) when it's not shared.
>
> Tested x86_64-linux, committed to
