https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112276
--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> --- -(define_split - [(set (match_operand:V2HI 0 "register_operand") - (eq:V2HI - (eq:V2HI - (us_minus:V2HI - (match_operand:V2HI 1 "register_operand") - (match_operand:V2HI 2 "register_operand")) - (match_operand:V2HI 3 "const0_operand")) - (match_operand:V2HI 4 "const0_operand")))] - "TARGET_SSE4_1" - [(set (match_dup 0) - (umin:V2HI (match_dup 1) (match_dup 2))) - (set (match_dup 0) - (eq:V2HI (match_dup 0) (match_dup 2)))]) the splitter is wrong when op1 == op2.(the original pattern returns 0, after splitter, it returns 1) So remove the splitter.
