[Bug middle-end/110989] RISC-V vector ICE due to invalid tree code in GIMPLE vect pass

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110989

--- Comment #2 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
Confirm it's caused by:

                        if (!final_len)
                          {
                            /* Pass VF value to 'len' argument of
                               MASK_LEN_LOAD if LOOP_LENS is invalid.  */
                            tree iv_type
                              = LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo);
                            final_len
                              = build_int_cst (iv_type,
                                               TYPE_VECTOR_SUBPARTS (vectype));
                          }


The final_len is false when we didn't record len. 
In this situation, LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo) is not 
set correctly.


Thanks for reporting.