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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108500] [11/12 Regression] -O
 -finline-small-functions results in "internal compiler error: Segmentation
 fault" on a very large program (700k function calls)
Date: Thu, 02 Feb 2023 10:34:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108500

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
To not look at "nothing" (after successful SRA it should indeed become almo=
st
nothing) I've added a store to a volatile 'x' global variable to the end
of main:

...
  s2 =3D f(s1,s2);
  x =3D s2;
  return 0;
}

not using main but a function returning a struct would probably work as wel=
l.
Otherwise DCE/DSE will remove all code.  Doing that reveals that RTL DSE
(more specifically rtx_equal_for_cselib_1) is very slow (via
dse_step1 calling cselib_process_insn).

I do wonder if you can share the "real" testcase?  It doesn't need to
be able to link, preprocessed source would be enough.=