https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60621
julien.blanc at laposte dot net changed:
What |Removed |Added
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CC| |julien.blanc at laposte dot net
--- Comment #5 from julien.blanc at laposte dot net ---
Testing a bit, it really looks like the issue resides in how and where the
temporary string objects are created.
Changing marc’s code to have
struct S {
S(const char* a, const char * b, const char *c);
};
makes it reverting back to only 0.3k more text (which can be explained because
two emplace_back function instanciation are needed vs one), and better
insertion performance (insertion time is worse otherwise, which breaks
emplace_back purpose).
The same goes if strings are constructed before being passed to S constructor.
(see new attachment).
Looks like an optimizer issue to me.
(note : tested with gcc 4.9.2)
