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[Bug c++/70452] [5/6 Regression] Regression in C++ parsing performance between 4.9.3 and 5.3.1
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 30 Mar 2016 14:09:39 +0000
- Subject: [Bug c++/70452] [5/6 Regression] Regression in C++ parsing performance between 4.9.3 and 5.3.1
- Auto-submitted: auto-generated
- References: <bug-70452-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70452
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2016-03-30
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. For trunk I get
Samples: 13K of event 'cycles', Event count (approx.): 11326375876
4.71% cc1plus cc1plus [.] copy_tree_body_r(tree_node**, int*,
voi
4.49% cc1plus cc1plus [.]
cxx_eval_constant_expression(constexpr_
4.20% cc1plus cc1plus [.] ggc_internal_alloc(unsigned long, void
2.94% cc1plus cc1plus [.] remap_type(tree_node*,
copy_body_data*)
2.69% cc1plus cc1plus [.] ggc_set_mark(void const*)
2.67% cc1plus cc1plus [.] gt_ggc_mx_lang_tree_node(void*)
2.41% cc1plus cc1plus [.] walk_tree_1(tree_node**, tree_node*
(*)
2.29% cc1plus cc1plus [.] cxx_eval_call_expression(constexpr_ctx
2.11% cc1plus cc1plus [.] htab_find_slot_with_hash
nothing "obvious" here other than that we're actually copying a lot of stuff
just to evaluate it.