https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67057
--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> --- (In reply to Oleg Endo from comment #0) > Combine is looking for a pattern: > > Failed to match this instruction: > (set (reg:SI 162 [ D.1652 ]) > (plus:SI (zero_extract:SI (reg:SI 4 r4 [ a ]) > (const_int 1 [0x1]) > (const_int 25 [0x19])) > (const_int 4 [0x4]))) > > Which could be implemented with treg_set_expr. In this case, the treg_set_expr should be only matched if it will expand into a negating T bit store. For that a new predicate "neg_treg_set_expr" should be added. sh_recog_treg_set_expr should get an additional parameter whether it should match positive, negative or both forms.
