https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113835
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-02-09
Target Milestone|--- |13.3
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Known to fail| |13.2.1, 14.0
Component|c++ |libstdc++
Known to work| |12.2.1
Summary|compiling std::vector with |[13/14 Regression]
|const size in C++20 is slow |compiling std::vector with
| |const size in C++20 is slow
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with -std=c++20 -fsyntax-only
constant expression evaluation : 1.80 ( 85%) 0.03 ( 14%) 1.84 ( 78%)
220M ( 88%)
TOTAL : 2.13 0.22 2.36
250M
Samples: 8K of event 'cycles', Event count (approx.): 9294971478
Overhead Samples Command Shared Object Symbol
16.33% 1385 cc1plus cc1plus [.]
cxx_eval_constant_expression
4.35% 369 cc1plus cc1plus [.] cxx_eval_call_expression
3.90% 331 cc1plus cc1plus [.]
cxx_eval_store_expression
3.16% 268 cc1plus cc1plus [.]
hash_table<hash_map<tree_node*, tree_node*, simple_has
2.55% 216 cc1plus cc1plus [.]
hash_table<hash_map<tree_node*, tree_node*, simple_has
2.15% 183 cc1plus cc1plus [.] ggc_internal_alloc
2.04% 173 cc1plus cc1plus [.]
hash_table<int_cst_hasher, false, xcallocator>::find_s
1.98% 168 cc1plus cc1plus [.] tree_operand_check
GCC 12 was fast (possibly std::vector wasn't constexpr there?)
