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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/99694] [9/10/11 Regression] gcc: fatal error: Killed
 signal terminated program cc1 under -O2 to -Os since
 r9-7156-g33579b59aaf02eb7
Date: Mon, 22 Mar 2021 08:32:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99694

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |9.4

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Seems the hang is during VN in the PRE pass, after a short while we keep
cycling between process_bb on
<bb 4> [local count: 719407025]:
# k_14 =3D PHI <f_27(3), f_28(8)>
# f_28 =3D PHI <f_27(3), f_28(8)>
# g_30 =3D PHI <f_27(3), f_28(8)>
# e_10 =3D PHI <e_21(3), e_13(8)>
*g_30 =3D 0;
e.1_2 =3D e_10;
_3 =3D e.1_2 + 1;
e_13 =3D _3;
e.3_4 =3D e_13;
if (e.3_4 !=3D 0)
  goto <bb 8>; [0.00%]
else
  goto <bb 5>; [100.00%]
and on
<bb 8> [local count: 0]:
goto <bb 4>; [100.00%]
forever.=