[Bug libstdc++/113175] [14 Regression] testsuite/std/ranges/iota/max_size_type.cc 5x times slower

[hp at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113175

--- Comment #2 from Hans-Peter Nilsson  ---
Bisecting (native) has progressed beyond the r13 mark, i.e. this is indeed a
"[14 Regression]" only.

[Bug libstdc++/113175] [14 Regression] testsuite/std/ranges/iota/max_size_type.cc 5x times slower

[hp at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113175

Hans-Peter Nilsson  changed:

   What|Removed |Added

 Target|mmix-knuth-mmixware |mmix-knuth-mmixware,
   ||x86_64-linux-gnu
Summary|[14 Regression] MMIX:   |[14 Regression]
   |testsuite/std/ranges/iota/m |testsuite/std/ranges/iota/m
   |ax_size_type.cc 5x times|ax_size_type.cc 5x times
   |slower  |slower
  Component|target  |libstdc++

--- Comment #1 from Hans-Peter Nilsson  ---
I'm afraid this isn't target-specific.
I bootstrapped native x86_64-linux-gnu off the both source trees, and ran \time
env LD_LIBRARY_PATH=(long curse) ./max_size_type.exe

r12-2797-g307e0d40367996:
0.32user 0.00system 0:00.32elapsed 99%CPU (0avgtext+0avgdata 2620maxresident)k
0inputs+0outputs (0major+184minor)pagefaults 0swaps

r14-6859-gd1eacedc6d9b:
1.73user 0.00system 0:01.73elapsed 100%CPU (0avgtext+0avgdata 3564maxresident)k
0inputs+0outputs (0major+194minor)pagefaults 0swaps

...which is a factor of about 5.4, consistent with the MMIX observation.
Still unknown whether libstdc++ or code-generator of course, but I'm leaning
towards the latter, for the same reasons as in the precious comment.  Maybe the
test-case triggers peculiar details.