[Bug target/126434] [17 Regression] ICE: invalid rtl sharing found in the insn {zero_extendsidi2}

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126434

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 65144
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65144&action=edit
reduced testcase

(I am sorry for the empty Description, I pressed Enter by mistake)

Compiler output:
$ powerpc64le-unknown-linux-gnu-gcc -O1 -favoid-store-forwarding
--param=store-forwarding-max-distance=146 testcase.c
testcase.c: In function 'foo':
testcase.c:9:1: error: invalid rtl sharing found in the insn
    9 | }
      | ^
(insn 46 43 14 2 (set (subreg:DI (reg:TI 134 [ _2 ]) 0)
        (zero_extend:DI (subreg:SI (reg:TI 134 [ _2 ]) 0))) "testcase.c":8:5 16
{zero_extendsidi2}
     (nil))
testcase.c:9:1: error: shared rtx
(subreg:DI (reg:TI 134 [ _2 ]) 0)
during RTL pass: avoid_store_forwarding
testcase.c:9:1: internal compiler error: internal consistency failure
0x23c5dcd internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0xd1f25c verify_rtx_sharing
        /repo/gcc-trunk/gcc/emit-rtl.cc:3061
0xd1efda verify_rtx_sharing
        /repo/gcc-trunk/gcc/emit-rtl.cc:3076
0xd200f3 verify_insn_sharing
        /repo/gcc-trunk/gcc/emit-rtl.cc:3146
0xd245cf verify_rtl_sharing()
        /repo/gcc-trunk/gcc/emit-rtl.cc:3169
0x10f2adf execute_function_todo
        /repo/gcc-trunk/gcc/passes.cc:2121
0x10f2fd7 execute_todo
        /repo/gcc-trunk/gcc/passes.cc:2152
/repo/gcc-trunk/binary-trunk-20260727043948-r17-2723-g3f2b3eced0f827-checking-yes-rtl-df-extra-powerpc64le/bin/../libexec/gcc/powerpc64le-unknown-linux-gnu/17.0.0/cc1
-quiet -iprefix
/repo/gcc-trunk/binary-trunk-20260727043948-r17-2723-g3f2b3eced0f827-checking-yes-rtl-df-extra-powerpc64le/bin/../lib/gcc/powerpc64le-unknown-linux-gnu/17.0.0/
testcase.c -quiet -dumpdir a- -dumpbase testcase.c -dumpbase-ext .c -O1
-favoid-store-forwarding --param=store-forwarding-max-distance=146 -o
/tmp/ccwOVa5w.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.