https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82739
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-10-27
CC| |marxin at gcc dot gnu.org,
| |redi at gcc dot gnu.org
Summary|Sort is 30% slower compared |[5/6/7/8 Regression] Sort
|to gcc44 on presorted array |is 30% slower compared to
| |gcc44 on presorted array
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, I see one regression that happened in r217669:
Author: jason
* cp-gimplify.c (genericize_cp_loop): Use LOOP_EXPR.
(genericize_for_stmt): Handle null statement-list.
It's revision that is firstly in version 4.9.
It caused following change (I slightly reduced # of iterations):
after: 5.376292
before: 4.322826
In between 4.5.0 and 4.9.0 I see just small regression. Key question is how
changed std::__introsort_loop<__gnu_cxx::__normal_iterator<int*,
std::vector<int, std::allocator<int> > >, long,
__gnu_cxx::__ops::_Iter_less_iter> function with that revision. Jonathan, can
you please take a look?
