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julia.asm
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Assembly Source File
|
1992-04-28
|
3KB
|
85 lines
; This program, originally available on the Motorola DSP bulletin board
; is provided under a DISCLAIMER OF WARRANTY available from Motorola DSP
; Operation, 6501 William Cannon Drive West, Austin, Texas 78735-8598.
;
; This program generates the Julia Set, found by Gaston Julia in
; early twentieth century. It outputs N * N integers which
; can be mapped to color tables for display. The points
; with integer value equal to "MAX" are in the Julia Set.
; The quadratic functions used : f(z) = z*z + c, where |c| < 2
; Example Seed values : c = c1 + c2
; (1) -1.0
; (2) 0.3 - j0.4
; (3) 0.360284 + j0.100376
; (4) -0.1 + j0.8
; Motorola DSP Applications
; Last Update : 8-3-90
; d0,d1 : store intermediate results
; d2 : intermediate result, and 4.0
; d3 : counter
; d4 : y0, starts at 2.0
; d5 : c2
; d6 : x0, starts at -2.0
; d7 : 1/50, or 0.02
; d8 : c1
; d9 : not used
main equ $100
coef equ $0
output equ $100
N equ 200
MAX equ 20
org x:coef
dc 2.0
dc 4.0
org y:coef
dc MAX
org p:main
move #coef+2,r0
move #coef+3,r4 ; temporary storage for x,y,x0,y0
move #coef,r2
move #output,r5
clr d3 #-2.0,d6.s ; x0
move #0.8,d5.s
move #0.02,d7.s ; 1/50
move #2.0,d4.s ; y0
fadd.s d7,d6 #-0.1,d8.s ; update x0, c1
fsub.s d7,d4 ; update y0
move d6.s,x:(r0) d4.s,y:
move d6.s,x:(r4) d4.s,y: ; initiliazation
do #N,_mloop
do #N,_nloop
_count
move x:(r4),d6.s y:,d4.s
fmpy.s d6,d6,d1 d8.s,d0.s ; x*x, c1
fmpy d4,d4,d0 fadd.s d0,d1 ; y*y, x*x+c1
fmpy d4,d6,d0 fsub.s d0,d1 d4.s,d2.s x:(r2)+,d4.s ; x*y, x1, 2
fmpy.s d0,d4,d0 d1.s,d4.s d1.s,x:(r4) ; 2*x*y, x1
fmpy d4,d4,d1 fadd.s d5,d0 d2.s,d4.s x:(r2)-,d2.s ; x1*x1, y1
fmpy.s d0,d0,d0 d0.s,y:(r4) ; y1*y1
fadd.s d1,d0 ; z
fcmp d0,d2 y:(r2),d2.l ; 4.0-z, MAX
fjmi _save ; check for out of bound
inc d3 ; counter++
cmp d2,d3 ; MAX-counter
jne _count
_save
move x:(r0),d2.s y:,d4.s ; update y0
fsub.s d7,d4 d3.l,y:(r5)+ ; output
clr d3 d4.s,y:(r0) ; reset counter
move d2.s,x:(r4) d4.s,y:
_nloop
move x:(r0),d6.s
fadd.s d7,d6 x:(r2),d4.s ; update x0
fsub.s d7,d4 d6.s,x:(r0) ; update y0
move d6.s,x:(r4) d4.s,y:
move d4.s,y:(r0)
_mloop