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dos33fsprogs
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tfv: more minor speedups

This commit is contained in:
Vince Weaver 2020-12-31 11:59:58 -05:00
parent 6265f0a75d
commit 0888e0e857
1 changed files with 18 additions and 20 deletions
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38
tfv/flying_mode7.s
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@ -6,7 +6,7 @@
; 2d070 cycles = 184,432 = 5.4 fps
; 2da70 cycles (added in 2 cycle cpx) a00 = 2560, yes, 32*40=1280
; 2aec3 cycles (update inner loop) = 175,811 = 5.7 fps
; 29af5 cycles (move things around) = 170,741 = 5.85 fps
; flying_loop -> check_done 2040 - 214f 2E
;
@ -23,9 +23,6 @@
draw_background_mode7:
no_draw_sky:
; setup initial odd/even color mask
lda #$f0 ; 2
sta COLOR_MASK ; 3
@ -45,12 +42,11 @@ screeny_loop:
sta COLOR_MASK ; 3
sta mask_label+1 ; setup self-modifying code ; 4
eor #$ff ; setup self-modifying branch later ; 2
bmi odd_branch ; beq is $f0 (too clever FIXME) ; 2nt/3
lda #$1d ; bit is $2c ; 2
bpl odd_branch ; smc for even/odd line ; 2nt/3
lda #$1d ; ora abs,X opcode is $1d ; 2
bne ok_branch ; bra ; 3
odd_branch:
lda #$2c ; ora abs,X ; 2
lda #$2c ; bit is $2c ; 2
ok_branch:
sta innersmc1 ; actually update ora/bit ; 4
;============
@ -58,14 +54,14 @@ ok_branch:
setup_gr_addr:
lda gr_offsets,Y ; lookup low-res memory row address ; 4
sta innersmc1+1 ; store in GBASL zero-page pointer ; 4
sta innersmc2+1 ; store in GBASL zero-page pointer ; 4
sta innersmc1+1 ; smc low addr ; 4
sta innersmc2+1 ; smc low addr ; 4
lda gr_offsets+1,Y ; load high part of address ; 4
clc ; clear carry for add ; 2
adc DRAW_PAGE ; add in draw page offset ; 3
sta innersmc1+2 ; store in GBASL zero-page pointer ; 4
sta innersmc2+2 ; store in GBASL zero-page pointer ; 4
sta innersmc1+2 ; smc high addr ; 4
sta innersmc2+2 ; smc high addr ; 4
;=============
; 29
@ -427,8 +423,17 @@ innersmc2:
;============
; 11
;===================================
; incremement column, see if done
inx ; increment SCREEN_X ; 2
cpx #40 ; 2
beq done_screenx_loop ; branch until we've done 40 ; 2nt/3
;=============
; 4/5
;=======================================
; advance to the next position in space
; fixed_add(&space_x,&dx,&space_x);
@ -461,15 +466,8 @@ dyi_label:
;============
; 18
inx ; increment SCREEN_X ; 2
cpx #40 ; 2
beq done_screenx_loop ; branch until we've done 40 ; 2nt/3
;=============
; 4/5
; cache color and return if same as last time
lda SPACEY_I ; 3
; lda SPACEY_I ; 3
spacey_label:
cmp #0 ; self modify, LAST_SPACEY_I ; 2
bne nomatch ; 2nt/3