[Bug tree-optimization/121514] New: [16 Regression] ICE: tree check: expected ssa_name, have integer_cst in VN_INFO, at tree-ssa-sccvn.cc:460 at -O2 with __builtin_mul_overflow() (?)

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121514

            Bug ID: 121514
           Summary: [16 Regression] ICE: tree check: expected ssa_name,
                    have integer_cst in VN_INFO, at tree-ssa-sccvn.cc:460
                    at -O2 with __builtin_mul_overflow() (?)
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 62103
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62103&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 testcase.c -Wno-psabi
during GIMPLE pass: fre
testcase.c: In function 'foo':
testcase.c:11:1: internal compiler error: tree check: expected ssa_name, have
integer_cst in VN_INFO, at tree-ssa-sccvn.cc:460
   11 | foo()
      | ^~~
0x2b84181 internal_error(char const*, ...)
        /repo/gcc-trunk/gcc/diagnostic-global-context.cc:534
0x9160e5 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        /repo/gcc-trunk/gcc/tree.cc:9161
0x8f3678 tree_check(tree_node*, char const*, int, char const*, tree_code)
        /repo/gcc-trunk/gcc/tree.h:3733
0x8f3678 VN_INFO(tree_node*)
        /repo/gcc-trunk/gcc/tree-ssa-sccvn.cc:460
0x18111c5 vn_nary_op_insert_stmt
        /repo/gcc-trunk/gcc/tree-ssa-sccvn.cc:4848
0x181c11b visit_nary_op
        /repo/gcc-trunk/gcc/tree-ssa-sccvn.cc:5714
0x181d8be process_bb
        /repo/gcc-trunk/gcc/tree-ssa-sccvn.cc:8357
0x181f3ce do_rpo_vn_1
        /repo/gcc-trunk/gcc/tree-ssa-sccvn.cc:8943
0x1820e9b execute
        /repo/gcc-trunk/gcc/tree-ssa-sccvn.cc:9104
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.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20250811173957-r16-3133-g127c05f4933365-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20250811173957-r16-3133-g127c05f4933365-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250811 (experimental) (GCC)