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FishMarket 1.0
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disk_013
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mandelbrot
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mandelmung.bas
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BASIC Source File
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1992-05-06
|
11KB
|
236 lines
1000 Dim code%(71),regs%(16)
1010 Restore 10000
1020 i% = 0: Read j$
1030 While Asc(j$) <> 126
1040 If Asc(j$) = 38 Then Poke_W VarPtr(code%(0)) + i%, Val(j$): i% = i% + 2
1050 Read j$
1060 WEnd
1070 BSave "MandelMung", VarPtr(code%(0)), 282
1999 End
1 '
1 ' MANDEL - calculate Mandelbrot set membership for a point
1 '
1 ' A point C (in the complex plane) belongs to the Mandelbrot set
1 ' if, after iteratively calculating the value Zn+1 = Zn2 + C (with Zo
1 ' being 0 + 0i) the value of Z converges or stabilizes. In this
1 ' algorithm, we actually just test if the magnitude of Z reaches or
1 ' exceeds 2.
1 '
1 ' Arguments:
1 '
1 ' D0 Cr (real component) in 2's complement fixed point binary
1 ' notation with 2 bits in front, 30 behind the binary point
1 '
1 ' D1 Ci (imaginary component)
1 '
1 ' D2 maximum number of iterations, 16 bit unsigned integer
1 ' 0 means 65536
1 '
1 ' Returns:
1 '
1 ' D2 number of iterations executed
1 '
1 ' creams all data registers
1 '
1 ' Stack and register usage:
1 '
1 ' A(A7) saved maximum iteration count (integer word)
1 '
1 ' 9(A7) -1 if Cr is negative, 0 otherwise (boolean byte)
1 '
1 ' 4(A7) absolute value of Cr
1 '
1 ' (A7) absolute value of Ci
1 '
1 ' D0,D1,D3 miscellaneous temporaries
1 '
1 ' D2 -1 if sign of Zr differs from sign of Cr, 0 otherwise
1 '
1 ' D4 absolute value of Zr (usually) - an unsigned longword
1 ' fixed point number with 1 or 2 (depending on when)
1 ' bits in front of the binary point
1 '
1 ' D5 absolute value of Zi (usually)
1 '
1 ' D6 sign of Zi or 2ZrZi (depending on what calculation
1 ' is pending). 0 for positive, -1 for negative
1 '
1 ' D7 iterations are counted down here using DBF. The value
1 ' starts out one less than the maximum count input in D2,
1 ' because of the behaviour of DBF
1 '
1 ' Initialize stuff, set up stack frame
1 '
1 ' MANDEL:
10000 Data &o051502 ," SUBQ.W #1,D2 Adjust count for DBF"
10002 Data &o037402 ," MOVE.W D2,-(A7) Save count on stack"
10004 Data &o037002 ," MOVE.W D2,D7 Move count to D7"
10006 Data &o045200 ," TST.L D0 Check sign of Cr"
10010 Data &o055702 ," SMI D2 Set D2 if negative"
10012 Data &h6A06 ," BPL 10$ Positive, no worry"
10014 Data &o042200 ," NEG.L D0 Cr < 0, |Cr| = -Cr"
10016 Data &h6900,&hAA ," BVS DONE1 Cr was -2, done"
1 '
10022 Data &o045201 ," 10$: TST.L D1 Check sign of Ci"
10024 Data &h6A06 ," BPL 20$ Already positive"
10026 Data &o042201 ," NEG.L D1 Nope, make it +ive"
10030 Data &h6900,&hAC ," BVS DONE2 Ci was -2, done"
1 '
10034 Data &o037402 ," 20$: MOVE.W D2,-(A7) Stack sign of Cr"
10036 Data &o027400 ," MOVE.L D0,-(A7) Put |Cr| on stack"
10040 Data &o027401 ," MOVE.L D1.-(A7) Put |Ci| on stack"
10042 Data &o074000 ," MOVEQ #0,D4 Clear Zr"
10044 Data &o075000 ," MOVEQ #0,D5 and Zi"
10046 Data &o076000 ," MOVEQ #0,D6 and sign of Zi"
1 '
1 ' Add Ci to 2ZrZi and Cr to Zr2-Zi2 to get new Zi and Zr, respectively
1 '
1 ' MNDLUP:
10050 Data &o045006 ," TST.B D6 Check sign of 2ZrZi"
10052 Data &h660C ," BNE 10$ Go do -ive things"
10054 Data &o155227 ," ADD.L (A7),D5 Add Ci to 2ZrZi"
10056 Data &h6500,&h92 ," BCS DONE Result >= 4, done"
10062 Data &h6B00,&h8E ," BMI DONE Result >= 2, done"
10066 Data &h600E ," BRA 20$ OK, go do real part"
1 '
10070 Data &o115227 ," 10$: SUB.L (A7),D5 Add -Ci to 2ZrZi"
10072 Data &h6506 ," BCS 15$ Negative?"
10074 Data &h6B00,&h84 ," BMI DONE Result >= 2, done"
10100 Data &h6004 ," BRA 20$ OK, go do real part"
1 '
10102 Data &o042205 ," 15$: NEG.L D5 Make Zi positive"
10104 Data &o043006 ," NOT.B D6 Note change in sign"
1 '
10106 Data &o045002 ," 20$: TST.B D2 sgn(Zr2-Zi2)<>Sgn(Cr)"
10110 Data &h660A ," BNE 30$ Signs <>, subtract"
10112 Data &o154257,&h4 ," ADD.L 4(A7),D4 Add Cr to Zr2-Zi2"
10116 Data &h6572 ," BCS DONE Result >= 4, done"
10120 Data &h6B70 ," BMI DONE Result >= 2, done"
10122 Data &h600E ," BRA 40$ Go square Z"
1 '
10124 Data &o114257,&h4,"30$: SUB.L 4(A7),D4 Add -Cr to Zr2-Zi2"
10130 Data &h6504 ," BCS 35$ Negative?"
10132 Data &h6B66 ," BMI DONE Result >= 2, done"
10134 Data &h6004 ," BRA 40$ |Cr|<|Zr2-Zi2|"
1 '
10136 Data &o042204 ," 35$: NEG.L D4 Think positive"
10140 Data &o043002 ," NOT.B D2 Sign changed"
1 '
10142 Data &o132057,&h9,"40$: CMP.B 9(A7),D2 Find sign of Zr"
10146 Data &h6702 ," BEQ 45$ Positive, go on"
10150 Data &o043006 ," NOT.B D6 Note sign of 2ZrZi"
1 '
1 ' Square Z, i.e., calculate 2ZrZi and Zr2-Zi2
1 ' also, check magnitude of Z > 2 (Zr2+Zi2 > 4)
1 '
10152 Data &o161604 ," 45$: ASL.L #1,D4 Align Zr"
10154 Data &o161605 ," ASL.L #1,D5 and Zi for BIGMUL"
10156 Data &o027404 ," MOVE.L D4,-(A7) Push Zr"
10160 Data &o027405 ," MOVE.L D5,-(A7) Push Zi"
10162 Data &h6158 ," BSR BIGMUL Get ZrZi"
10164 Data &o023037 ," MOVE.L (A7)+,D3 High end into D3"
10166 Data &o160727 ," ASL.W (A7) Get top of low end"
10170 Data &o161623 ," ROXL.L #1,D3 Make 2ZrZi"
10172 Data &o045127 ," TST.W (A7) Check next bit"
10174 Data &h6A02 ," BPL 50$ Is is set?"
10176 Data &o051203 ," ADDQ.L #1,D3 Yup, round up"
1 '
10200 Data &o027204 ," 50$: MOVE.L D4,(A7) Put Zr on stack"
10202 Data &h6176 ," BSR BIGSQR Get Zr2"
10204 Data &o027405 ," MOVE.L D5,-(A7) Push Zi"
10206 Data &h6172 ," BSR BIGSQR Get Zi2"
10210 Data &o046327,&h33 ," MOVEM.L (A7),<D0,D1,D4,D5>"
10214 Data &o151205 ," ADD.L D5,D1 Add low parts"
10216 Data &o150604 ," ADDX.L D4,D0 Add high parts"
10220 Data &h6522 ," BCS DONE3 Zr2+Zi2 >= 4"
10222 Data &o46337,&h33 ," MOVEM.L (A7)+,<D0,D1,D4,D5>"
10226 Data &o012057,&h9 ," MOVE.B 9(A7),D2 Get sign of Cr"
10232 Data &o115201 ," SUB.L D1,D5 Subtract Zi2"
10234 Data &o114600 ," SUBX.L D0,D4 from Zr2"
10236 Data &h6406 ," BCC 60$ Positive?"
10240 Data &o042205 ," NEG.L D5 No, make it"
10242 Data &o040204 ," NEGX.L D4 positive"
10244 Data &o043002 ," NOT.B D2 sgn(Zr2-Zi2)<>sgn(Cr)"
1 '
10246 Data &o045205 ," 60$: TST.L D5 Check top of bottom"
10250 Data &h6A02 ," BPL 70$ If 0, don't round"
10252 Data &o051204 ," ADDQ.L #1,D4 Round up Zr"
1 '
10254 Data &o143505 ," 70$: EXG D3,D5 Move 2ZrZi to D5"
10256 Data &o050717,&hFF78 ," DBF D7,MNDLUP ReSlog"
10262 Data &h600E ," BRA DONE Out of count, done"
1 '
1 ' Various ways out
1 '
1 ' DONE3:
10264 Data &o047757,&h10 ," LEA 10(A7),A7 Pop off Zr2, Zi2"
10270 Data &H6008 ," BRA DONE Go finish up"
1 ' DONE1:
10272 Data &o045201 ," TST.L D1 Cr=-2, does Ci=0?"
10274 Data &h6608 ," BNE DONE2 No, no big deal"
10276 Data &o077377 ," MOVEQ #-1,D7 Pretend we DBFed"
10300 Data &h6004 ," BRA DONE2 Go end it all"
1 ' DONE:
10302 Data &o047757,&hA ," LEA A(A7),A7 Remove Ci, Cr, flags"
1 ' DONE2:
10306 Data &o117527 ," SUB.W D7,(A7) Figure how many"
10310 Data &o032037 ," MOVE.W (A7)+,D2 times, put in D2"
10312 Data &o047165 ," RTS POPJ"
1 '
1 ' BIGMUL - unsigned 32 bit multiply
1 '
1 ' Arguments:
1 '
1 ' 2 unsigned longwords received on the stack
1 '
1 ' Returns:
1 '
1 ' 1 unsigned quadword on the stack
1
1 ' creams D0, D1, D2 and D3
1 '
1 ' BIGMUL:
10314 Data &o046257,&hF,&h4," MOVEM.W 4(A7),<D0,D1,D2,D3>"
10322 Data &o140302 ," MULU D2,D0 Both high order parts"
10324 Data &o141303 ," MULU D3,D1 Both low order parts"
10326 Data &o142357,&h6 ," MULU 6(A7),D2 High by low"
10332 Data &o143357,&h4 ," MULU 4(A7),D3 Low by high"
10336 Data &o027500,&h4 ," MOVE.L D0,4(A7) Store high back"
10342 Data &o027501,&h8 ," MOVE.L D1,8(A7) Store low back"
10346 Data &o152203 ," ADD.L D3,D2 Combine middle parts"
1 '
10350 Data &h6404 ," BIGCMN: BCC 10$ Any carry?"
10352 Data &o051157,&h4 ," ADDQ.W #1,4(A7) Yup, incr. top word"
1 '
10356 Data &o152657,&h6,"10$: ADD.L D2,6(A7) Put middle in middle"
10362 Data &h6404 ," BCC 20$ Any carry?"
10364 Data &o051157,&h4 ," ADDQ.W #1,4(A7) Yup, incr. top word"
1 '
10370 Data &o047165 ,"20$: RTS Done, return"
1 '
1 ' BIGSQR - unsigned 32 bit square
1 '
1 ' Arguments:
1 '
1 ' 1 unsigned longword on the stack
1 '
1 ' Returns:
1 '
1 ' 1 unsigned quadword on the stack
1 '
1 ' creams D0, D1 and D2
1 '
1 ' BIGSQR:
10372 Data &o027427 ," MOVE.L (A7),-(A7) Move ret. addr. up"
10374 Data &o030057,&h8 ," MOVE.W 8(A7),D0 High order into D0"
10400 Data &o031057,&hA ," MOVE.W A(A7),D1 Low order into D1"
10404 Data &o032000 ," MOVE.W D0,D2 Copy high order to D0"
10406 Data &o140300 ," MULU D0,D0 Mpy. high by high"
10410 Data &o141301 ," MULU D1,D1 Mpy. low by low"
10412 Data &o142357,&hA ," MULU A(A7),D2 Mpy. high by low"
10416 Data &o027500,&h4 ," MOVE.L D0,4(A7) Store high back"
10422 Data &o027501,&h8 ," MOVE.L D1,8(A7) Store low back"
10426 Data &o152202 ," ADD.L D2,D2 Double the middle"
10430 Data &h60CE ," BRA BIGCMN Join up with BIGMUL"
29999 Data ~