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From: "guojiufu at gcc dot gnu.org" <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, 09 Oct 2021 05:51:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102087

--- Comment #16 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
Thanks David, Richard,

~/gcc/install/gcc-mainline-base-debug/bin/gcc -v
Using built-in specs.
COLLECT_GCC=3D/home/guojiufu/gcc/install/gcc-mainline-base-debug/bin/gcc
COLLECT_LTO_WRAPPER=3D/home/guojiufu/gcc/install/gcc-mainline-base-debug/li=
bexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home/guojiufu/gcc/gcc-mainline-base/configure
--prefix=3D/home/guojiufu/gcc/install/gcc-mainline-base-debug --disable-boo=
tstrap
--disable-multilib --disable-werror --with-pkgversion=3D29c92857039d0a10
--enable-checking=3Ddf,extra,fold,rtl,yes --enable-languages=3Dc,c++,fortra=
n :
(reconfigured) /home/guojiufu/gcc/gcc-mainline-base/configure
--prefix=3D/home/guojiufu/gcc/install/gcc-mainline-base-debug --disable-boo=
tstrap
--disable-multilib --disable-werror --with-pkgversion=3D29c92857039d0a10
--enable-checking=3Ddf,extra,fold,rtl,yes --enable-languages=3Dc,c++,fortra=
n,lto
--no-create --no-recursion
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20210922 (experimental) (29c92857039d0a10)=20

~/gcc/install/gcc-mainline-base-debug/bin/gcc -c -O3 -w  ~/temp/t.c
-march=3Dopteron
~/gcc/install/gcc-mainline-base-debug/bin/gcc -c -O3 -w -march=3Dbdver2
~/temp/t.c

cat ~/temp/t.c
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];
}

I build both 3087d1b0a2c and the latest trunk, the case could pass.=