[Bug tree-optimization/127203] [17 Regression] ~30% slowdown of a testcase from pr26854 since r17-3264-g6cda72b8bd646c

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127203

Filip Kastl <pheeck at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-pc-linux-gnu         |x86_64-pc-linux-gnu,
                   |                            |aarch64-gnu-linux
               Host|x86_64-pc-linux-gnu         |x86_64-pc-linux-gnu,
                   |                            |aarch64-gnu-linux

--- Comment #1 from Filip Kastl <pheeck at gcc dot gnu.org> ---
Here are a few graphs showing the slowdown

This one is for an AMD Zen5 machine
https://lnt.opensuse.org/db_default/v4/CPP/graph?plot.0=989.591.8

This one shows the slowdown also on aarch64
https://lnt.opensuse.org/db_default/v4/CPP/graph?plot.0=686.591.8

This graph shows -Ofast compilation. Here we're slower than GCC 16.
https://lnt.opensuse.org/db_default/v4/CPP/graph?plot.0=750.591.8

Btw, note that pr26854 is about slowness of the dominator optimization pass. 
That could possibly indicate that the slowness isn't coming from ranger but
from the dominator pass itself?  But that's just a wild hypothesis.