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chiptune_player: minor optimization

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This commit is contained in:
Vince Weaver 2018-03-10 23:00:57 -05:00
parent 7af457f04a
commit 254cd0b163
1 changed files with 5 additions and 9 deletions
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14
chiptune_player/interrupt_handler.s
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@ -55,8 +55,7 @@ mb_write_loop:
cpx #13 ; 2 cpx #13 ; 2
bne mb_not_13 ; 3/2nt bne mb_not_13 ; 3/2nt
cmp #$ff ; 2 bmi increment_offset ; 3/2nt
beq increment_offset ; 3/2nt
;============ ;============
; typ 9 ; typ 9
mb_not_13: mb_not_13:
@ -98,7 +97,8 @@ mb_load_loop:
lda (INL),y ; load register value ; 5 lda (INL),y ; load register value ; 5
sta REGISTER_DUMP,X ; 4 sta REGISTER_DUMP,X ; 4
;============
; 9
;==================== ;====================
; point to next page ; point to next page
;==================== ;====================
@ -112,7 +112,7 @@ mb_load_loop:
cpx #13 ; if 14 we're done ; 2 cpx #13 ; if 14 we're done ; 2
bmi mb_load_loop ; otherwise, loop ; 3/2nt bmi mb_load_loop ; otherwise, loop ; 3/2nt
;============ ;============
; 19 ; 18
;========================================= ;=========================================
; if A_COARSE_TONE is $ff then we are done ; if A_COARSE_TONE is $ff then we are done
@ -124,13 +124,11 @@ mb_load_loop:
jmp quiet_exit ; 3 jmp quiet_exit ; 3
;=========== ;===========
; typ 13 ; typ 6
mb_not_done: mb_not_done:
;============================================== ;==============================================
; incremement offset. If 0 move to next chunk ; incremement offset. If 0 move to next chunk
;============================================== ;==============================================
@ -202,8 +200,6 @@ back_to_first_reg_c:
update_r0_pointer: update_r0_pointer:
sta INH ; update r0 pointer ; 3 sta INH ; update r0 pointer ; 3
;============
; 18
;================================= ;=================================