https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104610
--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> --- (In reply to Hongtao.liu from comment #4) > (In reply to Hongtao.liu from comment #3) > > (In reply to Hongtao.liu from comment #2) > > > in Gimple, there're > > > > > > _1 = __builtin_memcmp_eq (a_5(D), &t[0], 32); > > > _2 = _1 == 0; > > > _6 = (int) _2; > > > > > > > > > So it's related to codegen optimization with vectorized codes for > > > __builtin_memcmp_eq, guess we can start with size multiple of 16 bytes? > > > > > There's no optab or target_hook for backend to participate in optimization But there's cbranch_optab check in can_compare_p, and i386 supports V8SI/V4DI/V4SI/V2DI, but not for OI/TI, adding support for them? 25899(define_expand "cbranch<mode>4" 25900 [(set (reg:CC FLAGS_REG) 25901 (compare:CC (match_operand:VI48_AVX 1 "register_operand") 25902 (match_operand:VI48_AVX 2 "nonimmediate_operand"))) 25903 (set (pc) (if_then_else 25904 (match_operator 0 "bt_comparison_operator" 25905 [(reg:CC FLAGS_REG) (const_int 0)]) 25906 (label_ref (match_operand 3))
