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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102087] [12 Regression] ICE on valid code at
 -O3 on x86_64-linux-gnu: in determine_exit_conditions, at
 tree-ssa-loop-manip.c:1049 since r12-3136-g3673dcf6d6baeb67
Date: Sat, 28 Aug 2021 20:32:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102087

David Binderman <dcb314 at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com

--- Comment #8 from David Binderman <dcb314 at hotmail dot com> ---
I see this problem also, with this reduced C code:

char **Gif_ClipImage_gfi_0;
int Gif_ClipImage_y, Gif_ClipImage_shift;
void Gif_ClipImage(void) {
  for (; Gif_ClipImage_y >=3D Gif_ClipImage_shift; Gif_ClipImage_y++)
    Gif_ClipImage_gfi_0[Gif_ClipImage_shift] =3D
        Gif_ClipImage_gfi_0[Gif_ClipImage_y];
}

Flag -O3 -march=3Dbdver2 required.=