brooke/mandel-6502
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move total_ms, total_pixels out of zero page

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this frees up 12 bytes of zero page space and costs no measurable
time as these variables are not in the hot path and there was only
a tiny bit different.
This commit is contained in:
Brooke Vibber 2025-01-04 14:25:25 -08:00
parent d2bf77dc26
commit 7e5ca79d9a
1 changed files with 25 additions and 12 deletions
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37
mandel.s
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@ -33,8 +33,7 @@ chroma_ticks = $bd ; u8
count_frames = $be ; u8 count_frames = $be ; u8
count_pixels = $bf ; u8 count_pixels = $bf ; u8
total_pixels = $c0 ; float48 ; free space c0-cb
total_ms = $c6 ; float48
temp = $cc ; u16 temp = $cc ; u16
temp2 = $ce ; u16 temp2 = $ce ; u16
@ -63,6 +62,7 @@ FADD = $DA66 ; ADDITION (FR0 += FR1)
FSUB = $DA60 ; SUBTRACTION (FR0 -= FR1) FSUB = $DA60 ; SUBTRACTION (FR0 -= FR1)
FMUL = $DADB ; MULTIPLICATION (FR0 *= FR1) FMUL = $DADB ; MULTIPLICATION (FR0 *= FR1)
FDIV = $DB28 ; DIVISION (FR0 /= FR1) FDIV = $DB28 ; DIVISION (FR0 /= FR1)
ZFR0 = $DA44 ; clear FR0
ZF1 = $DA46 ; CLEAR ZERO PAGE FLOATING POINT NUMBER (XX) ZF1 = $DA46 ; CLEAR ZERO PAGE FLOATING POINT NUMBER (XX)
FLD0R = $DD89 ; LOAD FR0 WITH FLOATING POINT NUMBER (YYXX) FLD0R = $DD89 ; LOAD FR0 WITH FLOATING POINT NUMBER (YYXX)
FLD1R = $DD98 ; LOAD FR1 WITH FLOATING POINT NUMBER (YYXX) FLD1R = $DD98 ; LOAD FR1 WITH FLOATING POINT NUMBER (YYXX)
@ -203,6 +203,16 @@ ms_per_frame: ; float48 16.66666667
.byte $66 .byte $66
.byte $67 .byte $67
total_pixels: ; float48
.repeat 6
.byte 0
.endrepeat
total_ms: ; float48
.repeat 6
.byte 0
.endrepeat
display_list_start: display_list_start:
; 24 lines overscan ; 24 lines overscan
.repeat 3 .repeat 3
@ -1565,10 +1575,13 @@ main_loop:
sta count_pixels sta count_pixels
; total_ms = 0.0; total_pixels = 0.0 ; total_ms = 0.0; total_pixels = 0.0
ldx #total_ms jsr ZFR0
jsr ZF1 ldx #.lobyte(total_ms)
ldx #total_pixels ldy #.hibyte(total_ms)
jsr ZF1 jsr FST0R
ldx #.lobyte(total_pixels)
ldy #.hibyte(total_pixels)
jsr FST0R
jsr clear_screen jsr clear_screen
jsr status_bar jsr status_bar
@ -1691,19 +1704,19 @@ update_status:
jsr FMUL jsr FMUL
; FR0 += total_ms ; FR0 += total_ms
ldx #total_ms ldx #.lobyte(total_ms)
ldy #0 ldy #.hibyte(total_ms)
jsr FLD1R jsr FLD1R
jsr FADD jsr FADD
; total_ms = FR0 ; total_ms = FR0
ldx #total_ms ldx #.lobyte(total_ms)
ldy #0 ldy #.hibyte(total_ms)
jsr FST0R jsr FST0R
; FR0 /= total_pixels ; FR0 /= total_pixels
ldx #total_pixels ldx #.lobyte(total_pixels)
ldy #0 ldy #.hibyte(total_pixels)
jsr FLD1R jsr FLD1R
jsr FDIV jsr FDIV