[Bug tree-optimization/111751] RISC-V: RVV unexpected vectorization

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111751

--- Comment #14 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
Also this case ICE:

typedef unsigned char __attribute__((vector_size(4))) uvec;

int main (int argc, char *argv[]) {
    int i;
    int x = 0;
    uvec uc0 = (uvec) {argc, 1,  2,  10};
    unsigned char uc1[4] = {0, 3, 2, 200};
    signed char ucg[4] = {1, 0, 0, 0 };
    signed char ucl[4] = {0, 1, 0, 1 };

#define uc0_ ((unsigned char *)&uc0)

    for (i = 0; i < 4; i ++) {
        x |= ucg[i] != (uc0_[i] > uc1[i]);
        x |= ucl[i] != (uc0_[i] < uc1[i]);
    }
    return x;
}

during GIMPLE pass: isel
dump file: auto.c.256t.isel
auto.c: In function 'main':
auto.c:3:5: internal compiler error: in gimple_expand_vec_cond_expr, at
gimple-isel.cc:328
    3 | int main (int argc, char *argv[]) {
      |     ^~~~
0x1bb55bd gimple_expand_vec_cond_expr
        ../../../../gcc/gcc/gimple-isel.cc:325
0x1bb57c6 execute
        ../../../../gcc/gcc/gimple-isel.cc:390


Looks odd, it ICE at gimple-isel.cc:

gcc_assert (VECTOR_BOOLEAN_TYPE_P (TREE_TYPE (op0))