diff options
Diffstat (limited to 'flags.asm')
| -rw-r--r-- | flags.asm | 18 |
1 files changed, 13 insertions, 5 deletions
@@ -65,16 +65,24 @@ f_norm_z: move.b flag_valid-flag_storage(a3),d1 andi.b #%01000000,d1 bne.s FNZ_ok ; Bit is valid - move.b f_host_ccr-flag_storage(a3),d1 - andi.b #%01000000,d1 -;; XXX see above comment for using lea and then d(an) if you have a spare register. - or.b d1,flag_byte-flag_storage(a3) - ori.b #%01000000,flag_valid-flag_storage(a3) + bsr flags_normalize FNZ_ok: move.b flag_byte-flag_storage(a3),d1 andi.b #%01000000,d1 rts + ;; Normalize and return Parity/oVerflow bit (loaded into Z + ;; bit) + ;; Destroys d1 +f_norm_pv: + move.b flag_valid-flag_storage(a3),d1 + andi.b #%00000100,d1 + bne.s FNPV_ok ; Bit is already valid + bsr flags_normalize +FNPV_ok: + move.b flag_byte-flag_storage(a3),d1 + andi.b #%00000100,d1 + rts ;; Routine to turn 68k flags into z80 flags. ;; Preconditions: |