diff options
| -rw-r--r-- | alu.asm | 12 |
1 files changed, 10 insertions, 2 deletions
@@ -54,8 +54,8 @@ alu_sub: ;; sets flags ;; XXX use lea and then d(an) if you have a spare register. - ;; preserve operands for flagging + ;; preserve operands for flagging move.b d0,(f_tmp_src_b-flag_storage)(a3) move.b d1,(f_tmp_dst_b-flag_storage)(a3) move.b #1,(f_tmp_byte-flag_storage)(a3) @@ -78,5 +78,13 @@ alu_or: rts alu_cp: - ;; XXX do this + ;; Same as SUB but the macro that calls this doesn't save the + ;; result. + move.b d0,(f_tmp_src_b-flag_storage)(a3) + move.b d1,(f_tmp_dst_b-flag_storage)(a3) + move.b #1,(f_tmp_byte-flag_storage)(a3) + andi.b #%00000010,(flag_valid-flag_storage)(a3) + move.b #%00000010,(flag_byte-flag_storage)(a3) + sub d0,d1 + move sr,(f_host_sr-flag_storage)(a3) rts |