diff options
Diffstat (limited to 'opcodes.asm')
| -rw-r--r-- | opcodes.asm | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/opcodes.asm b/opcodes.asm index 35a7f4f..fca259c 100644 --- a/opcodes.asm +++ b/opcodes.asm @@ -1368,15 +1368,10 @@ emu_op_8f: ;; Do a SUB \2,\1 ;; XXX CHECK F_SUB_B MACRO ; 22 bytes? - ;; XXX use lea and then d(an) if you have a spare register. - ;; preserve operands for flagging - move.b \1,(f_tmp_src_b-flag_storage)(a3) - move.b \2,(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 \1,\2 - move sr,(f_host_sr-flag_storage)(a3) + move.b \2,d1 + move.b \1,d0 + bsr alu_sub + move.b d1,\2 ENDM START |