Created attachment 57588 [details]
-freport-bug output

Testcase:
long a, b;
extern short c[];
void d() {
  for (int e = 0; e < 5; e += 2) {
    a = ({ a < 0 ? a : 0; });
    b = ({ b < 0 ? b : 0; });
    c[e] = 0;
  }
}

Backtrace:
> /scratch/tc-testing/tc-feb-20/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc -march=rv64gcv -O3 red.c
during GIMPLE pass: vect
red.c: In function 'd':
red.c:3:6: internal compiler error: in vectorizable_store, at tree-vect-stmts.cc:8690
    3 | void d() {
      |      ^
0xbe592a vectorizable_store
        ../../../gcc/gcc/tree-vect-stmts.cc:8690
0x274ff35 vect_analyze_stmt(vec_info*, _stmt_vec_info*, bool*, _slp_tree*, _slp_instance*, vec<stmt_info_for_cost, va_heap, vl_ptr>*)
        ../../../gcc/gcc/tree-vect-stmts.cc:13241
0x15de0e2 vect_analyze_loop_operations
        ../../../gcc/gcc/tree-vect-loop.cc:2208
0x15de0e2 vect_analyze_loop_2
        ../../../gcc/gcc/tree-vect-loop.cc:3041
0x15dfdf0 vect_analyze_loop_1
        ../../../gcc/gcc/tree-vect-loop.cc:3481
0x15e0589 vect_analyze_loop(loop*, vec_info_shared*)
        ../../../gcc/gcc/tree-vect-loop.cc:3639
0x1627ed4 try_vectorize_loop_1
        ../../../gcc/gcc/tree-vectorizer.cc:1066
0x1627ed4 try_vectorize_loop
        ../../../gcc/gcc/tree-vectorizer.cc:1182
0x16287fc execute
        ../../../gcc/gcc/tree-vectorizer.cc:1298
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.

Godbolt: https://godbolt.org/z/s9YbYhK8e

Tested/found using r14-9084-g61ab046a327 (not bisected)

Found via fuzzer.