https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107546
--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> --- Failed to match this instruction: (set (reg:V16QI 95) (eq:V16QI (gt:V16QI (subreg:V16QI (reg:V2DI 89 [ MEM[(const __m128i_u * {ref-all})p_2(D)] ]) 0) (mem/u/c:V16QI (symbol_ref/u:DI ("*.LC0") [flags 0x2]) [0 S16 A128])) (const_vector:V16QI [ (const_int 0 [0]) repeated x16 ]))) I think rtl can simplify vector comparison (eq (gt op1 op2) const0_rtx) to just (gt op2 op1).