Home » Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_15_03.adf » !AcornAns_AcornAns » Flocking/C/s/macros1
Flocking/C/s/macros1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_15_03.adf » !AcornAns_AcornAns |
| Filename: | Flocking/C/s/macros1 |
| Read OK: | ✔ |
| File size: | 21B7 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
; rbbc
; Reverse Bit Binary Counter.
; A macro to increment a register according to a reverse bit binary count.
; It takes four parameters, each of which should be a register name.
;
; $r: holds value to be rbbc incremented. Will be modified
; $k: k is st k-1=bit # (1 to 31) of msb in register (lsb in rbbc) (thence old w=3*(32-k)).
; $e: scratch register used to hold an address in the code
;
MACRO
$label rbbc $r, $k, $e
ASSERT $r <> $k
ASSERT $r <> $e
ASSERT $k <> $e
LCLA counter
counter SETA 31
$label RSB $k, $k, #32
RSB $k, $k, $k, ASL #2
ADD $e, pc, $k, ASL #2 ;this relys on there being exactly one instruction between here & TST
MOV pc, $e
WHILE counter > 1
TST $r, #1<<counter
EOR $r, $r, #1<<counter
BEQ %ft0
counter SETA counter-1
WEND
TST $r, #1<<1
EOR $r, $r, #1<<1
EORNE $r, $r, #1<<0 ;nb an rbbc carry will automatically cause a wrap around back to zero
0
MEND
; div16
; assumes abs number < 65536 * abs divisor.
; calculates integer part of 65536*number/divisor, as a signed 32 bit number.
; used in matrix inversion routine where it is necessary to divide two fixed point numbers (16 bit fraction).
; if range check on above assumption is required, the caller must perform it.
; It takes 5 parameters - all register names.
;
; $number: number
; $divisor: divisor - sign of divisor may be corrupted
; $num: scratch & result - may be the same as $number
; $sign: scratch
; $rem: scratch
;
MACRO
$label div16 $number, $divisor, $num, $sign, $rem
ASSERT $num <> $divisor
ASSERT $num <> $sign
ASSERT $num <> $rem
ASSERT $number <> $divisor
ASSERT $number <> $sign
ASSERT $number <> $rem
ASSERT $divisor <> $sign
ASSERT $divisor <> $rem
ASSERT $sign <> $rem
LCLA counter
counter SETA 32
$label MOVS $rem, $divisor, LSL #1
RSBCS $divisor, $divisor, #0
ADC $sign, $sign, $sign ;1st 3 instructions allow setting of low bit sign as either 0
;or 1 according to sign of divisor, in only 1 instruction.
TEQ $number, #0
RSBMI $num, $number, #0
[ $num <> $number
MOVPL $num, $number ;only assemble this case if regs different, as is otherwise a nop.
]
EORMI $sign, $sign, #1
MOV $rem, $num, LSR #16
MOV $num, $num, LSL #16
WHILE counter > 0 ;unwound loop uses about 600 bytes extra memory
MOVS $num, $num, ASL #1 ;speed increase (ARM3) from about 1.27e-5 to .75e-5 seconds
ADC $rem, $rem, $rem
CMP $rem, $divisor
SUBHS $rem, $rem, $divisor
ORRHS $num, $num, #1
counter SETA counter-1
WEND
CMP $rem, $divisor, ASR #1
ADDGE $num, $num, #1
TST $sign, #1
RSBNE $num, $num, #0
MEND
; mul16
; multiplication of an integer x by a 16-bit fixed point number a, with no restrictions on x or a
; other than that x*a/65536 must fit into a signed 32-bit representation.
; calculates r=x*a/65536
; It takes 6 parameters - all register names.
;
; $x: x
; $a: a - a will be corrupted
; $r: result - may be the same as $x
; $u: scratch
; $v: scratch
; $w: scratch
;
MACRO
$label mul16 $x, $a, $r, $u, $v, $w
ASSERT $r <> $a
ASSERT $r <> $u
ASSERT $r <> $v
ASSERT $r <> $w
ASSERT $x <> $a
ASSERT $x <> $u
ASSERT $x <> $v
ASSERT $x <> $w
ASSERT $a <> $u
ASSERT $a <> $v
ASSERT $a <> $w
ASSERT $u <> $v
ASSERT $u <> $w
ASSERT $v <> $w
$label MOVS $w, $a, LSL #1
RSBCS $a, $a, #0
TEQ $x, #0
RSBMI $r, $x, #0
[ $r <> $x
MOVPL $r, $x
] ;now have C bit set iff a<0, N bit set iff x<0
MOV $w, pc, LSR #31
MOV $w, $w, LSL #28 ;get w=(2^28)*N {N is b31, V is b28, C is b29 in pc/psr}
TEQP $w, pc, LSR #1 ;EOR w into pc/psr {ie N EOR C is put into V} - this is a way of storing
;sign of result in overflow flag, saving on a register
MOV $w, $r, LSR #16
BIC $r, $r, $w, LSL #16
MOV $v, $a, LSR #16
BIC $a, $a, $v, LSL #16
MUL $u, $a, $r
TST $u, #1<<15 ;notice this is the only operation altering psr & that it will not corrupt V
;note it will corrupt C, as immediate operand 32768 requires a shift
MOV $u, $u, LSR #16
ADDNE $u, $u, #1
MLA $u, $r, $v, $u ;6/9/94 - reverse v & r to optimise for argument a small
MLA $u, $a, $w, $u
MUL $r, $w, $v ;6/9/94 - reverse v & w to optimise for argument a small
ADD $r, $u, $r, LSL #16
RSBVS $r, $r, #0
MEND
; mul16c
; multiplication of an integer x by a 16-bit fixed point number a, where a is a contraction
; ie calculates r=x*a/65536, assuming: abs a < 65536
; if the possibility exists that a>=65536, caller should check this & either not call routine, or set a=65535
; It takes 4 parameters - all register names.
;
; $x: x
; $a: a - require abs a <65536, a will be corrupted
; $r: result - may be the same as $x
; $w: scratch
;
MACRO
$label mul16c $x, $a, $r, $w
ASSERT $r <> $a
ASSERT $r <> $w
ASSERT $x <> $a
ASSERT $x <> $w
ASSERT $a <> $w
$label MOVS $w, $a, LSL #1
RSBCS $a, $a, #0
TEQ $x, #0
RSBMI $r, $x, #0
[ $r <> $x
MOVPL $r, $x
]
MOV $w, pc, LSR #31 ;see mul16 above, for comments re this part
MOV $w, $w, LSL #28
TEQP $w, pc, LSR #1
TST $a, #1<<16 ;bodge to allow code to function if $a is upto 2*65536-1
MOVNE $r, $r, LSL #1 ;can occur in a contractive fn due to change of coordinates to handle 1x2 pixel aspect ratio
MOVNE $a, $a, LSR #1 ;change made 3/4/94 - estimate overhead to ria of upto 3%
MOV $w, $r, LSR #16
BIC $r, $r, $w, LSL #16
MUL $r, $a, $r
TST $r, #1<<15 ;remember, can't use movs r,r,lsr #16, as this would corrupt V, which is storing sign of result
MOV $r, $r, LSR #16
ADDNE $r, $r, #1
MLA $r, $a, $w, $r
RSBVS $r, $r, #0
MEND
; sqrt16
; integer square root returning 16-bit fixed point number, assuming x is 16-bit fixed point
; ie returns sqrt(x<<16)
; It takes 6 parameters - all register names
;
; $x: x
; $r: result - may be the same as x
; $n: copy of x used during calculation
; $t: transient scratch
; $d: remainder
; $o: constant value of 1
;
MACRO
$label sqrt16 $x, $r, $n, $t, $d, $o
ASSERT $x <> $n
ASSERT $x <> $t
ASSERT $x <> $d
ASSERT $x <> $o
ASSERT $n <> $t
ASSERT $n <> $d
ASSERT $n <> $o
ASSERT $t <> $d
ASSERT $t <> $o
ASSERT $d <> $o
LCLA counter
$label MOV $n, $x
MOV $o, #1
MOV $x, #0
MOV $d, #0
AND $t, $n, #(3<<30)
MOV $t, $t, LSR #30
ORR $d, $d, $t
ADD $t, $o, $x, LSL #1
CMP $d, $t
SUBGE $d, $d, $t
ADDGE $x, $x, #1
counter SETA 28
WHILE counter < 32 ;want >= 0, however counter is unsigned, so after 0 it goes high, thus < 32 will catch it!
MOV $x, $x, LSL #1
MOV $d, $d, LSL #2
AND $t, $n, #(3<<counter)
[ counter <> 0
MOV $t, $t, LSR #counter
]
ORR $d, $d, $t
ADD $t, $o, $x, LSL #1
CMP $d, $t
SUBGE $d, $d, $t
ADDGE $x, $x, #1
counter SETA counter-2
WEND
counter SETA 14
WHILE counter < 32
MOV $x, $x, LSL #1
MOV $d, $d, LSL #2
ADD $t, $o, $x, LSL #1
CMP $d, $t
SUBGE $d, $d, $t
ADDGE $x, $x, #1
counter SETA counter-2
WEND
[ $r <> $x
MOV $r, $x
]
MEND
END
00000000 3b 20 72 62 62 63 0a 3b 20 52 65 76 65 72 73 65 |; rbbc.; Reverse|
00000010 20 42 69 74 20 42 69 6e 61 72 79 20 43 6f 75 6e | Bit Binary Coun|
00000020 74 65 72 2e 0a 3b 20 41 20 6d 61 63 72 6f 20 74 |ter..; A macro t|
00000030 6f 20 69 6e 63 72 65 6d 65 6e 74 20 61 20 72 65 |o increment a re|
00000040 67 69 73 74 65 72 20 61 63 63 6f 72 64 69 6e 67 |gister according|
00000050 20 74 6f 20 61 20 72 65 76 65 72 73 65 20 62 69 | to a reverse bi|
00000060 74 20 62 69 6e 61 72 79 20 63 6f 75 6e 74 2e 0a |t binary count..|
00000070 3b 20 49 74 20 74 61 6b 65 73 20 66 6f 75 72 20 |; It takes four |
00000080 70 61 72 61 6d 65 74 65 72 73 2c 20 65 61 63 68 |parameters, each|
00000090 20 6f 66 20 77 68 69 63 68 20 73 68 6f 75 6c 64 | of which should|
000000a0 20 62 65 20 61 20 72 65 67 69 73 74 65 72 20 6e | be a register n|
000000b0 61 6d 65 2e 0a 3b 0a 3b 20 24 72 3a 20 20 20 68 |ame..;.; $r: h|
000000c0 6f 6c 64 73 20 76 61 6c 75 65 20 74 6f 20 62 65 |olds value to be|
000000d0 20 72 62 62 63 20 69 6e 63 72 65 6d 65 6e 74 65 | rbbc incremente|
000000e0 64 2e 20 57 69 6c 6c 20 62 65 20 6d 6f 64 69 66 |d. Will be modif|
000000f0 69 65 64 0a 3b 20 24 6b 3a 20 20 20 6b 20 69 73 |ied.; $k: k is|
00000100 20 73 74 20 6b 2d 31 3d 62 69 74 20 23 20 28 31 | st k-1=bit # (1|
00000110 20 74 6f 20 33 31 29 20 6f 66 20 6d 73 62 20 69 | to 31) of msb i|
00000120 6e 20 72 65 67 69 73 74 65 72 20 28 6c 73 62 20 |n register (lsb |
00000130 69 6e 20 72 62 62 63 29 20 28 74 68 65 6e 63 65 |in rbbc) (thence|
00000140 20 6f 6c 64 20 77 3d 33 2a 28 33 32 2d 6b 29 29 | old w=3*(32-k))|
00000150 2e 0a 3b 20 24 65 3a 20 20 20 73 63 72 61 74 63 |..; $e: scratc|
00000160 68 20 72 65 67 69 73 74 65 72 20 75 73 65 64 20 |h register used |
00000170 74 6f 20 68 6f 6c 64 20 61 6e 20 61 64 64 72 65 |to hold an addre|
00000180 73 73 20 69 6e 20 74 68 65 20 63 6f 64 65 0a 3b |ss in the code.;|
00000190 0a 20 20 20 20 20 20 20 20 4d 41 43 52 4f 0a 24 |. MACRO.$|
000001a0 6c 61 62 65 6c 20 20 72 62 62 63 20 20 20 20 24 |label rbbc $|
000001b0 72 2c 20 24 6b 2c 20 24 65 0a 0a 20 20 20 20 20 |r, $k, $e.. |
000001c0 20 20 20 41 53 53 45 52 54 20 20 24 72 20 3c 3e | ASSERT $r <>|
000001d0 20 24 6b 0a 20 20 20 20 20 20 20 20 41 53 53 45 | $k. ASSE|
000001e0 52 54 20 20 24 72 20 3c 3e 20 24 65 0a 20 20 20 |RT $r <> $e. |
000001f0 20 20 20 20 20 41 53 53 45 52 54 20 20 24 6b 20 | ASSERT $k |
00000200 3c 3e 20 24 65 0a 0a 20 20 20 20 20 20 20 20 4c |<> $e.. L|
00000210 43 4c 41 20 20 20 20 63 6f 75 6e 74 65 72 0a 63 |CLA counter.c|
00000220 6f 75 6e 74 65 72 20 53 45 54 41 20 20 20 20 33 |ounter SETA 3|
00000230 31 0a 0a 24 6c 61 62 65 6c 09 52 53 42 09 24 6b |1..$label.RSB.$k|
00000240 2c 20 24 6b 2c 20 23 33 32 0a 09 52 53 42 09 24 |, $k, #32..RSB.$|
00000250 6b 2c 20 24 6b 2c 20 24 6b 2c 20 41 53 4c 20 23 |k, $k, $k, ASL #|
00000260 32 0a 09 41 44 44 20 20 20 20 20 24 65 2c 20 70 |2..ADD $e, p|
00000270 63 2c 20 24 6b 2c 20 41 53 4c 20 23 32 20 20 20 |c, $k, ASL #2 |
00000280 20 20 20 3b 74 68 69 73 20 72 65 6c 79 73 20 6f | ;this relys o|
00000290 6e 20 74 68 65 72 65 20 62 65 69 6e 67 20 65 78 |n there being ex|
000002a0 61 63 74 6c 79 20 6f 6e 65 20 69 6e 73 74 72 75 |actly one instru|
000002b0 63 74 69 6f 6e 20 62 65 74 77 65 65 6e 20 68 65 |ction between he|
000002c0 72 65 20 26 20 54 53 54 0a 20 20 20 20 20 20 20 |re & TST. |
000002d0 20 4d 4f 56 20 20 20 20 20 70 63 2c 20 24 65 0a | MOV pc, $e.|
000002e0 0a 20 20 20 20 20 20 20 20 57 48 49 4c 45 20 20 |. WHILE |
000002f0 20 63 6f 75 6e 74 65 72 20 3e 20 31 0a 20 20 20 | counter > 1. |
00000300 20 20 20 20 20 54 53 54 20 20 20 20 20 24 72 2c | TST $r,|
00000310 20 23 31 3c 3c 63 6f 75 6e 74 65 72 0a 20 20 20 | #1<<counter. |
00000320 20 20 20 20 20 45 4f 52 20 20 20 20 20 24 72 2c | EOR $r,|
00000330 20 24 72 2c 20 23 31 3c 3c 63 6f 75 6e 74 65 72 | $r, #1<<counter|
00000340 0a 20 20 20 20 20 20 20 20 42 45 51 20 20 20 20 |. BEQ |
00000350 20 25 66 74 30 0a 63 6f 75 6e 74 65 72 20 53 45 | %ft0.counter SE|
00000360 54 41 20 20 20 20 63 6f 75 6e 74 65 72 2d 31 0a |TA counter-1.|
00000370 20 20 20 20 20 20 20 20 57 45 4e 44 0a 0a 20 20 | WEND.. |
00000380 20 20 20 20 20 20 54 53 54 20 20 20 20 20 24 72 | TST $r|
00000390 2c 20 23 31 3c 3c 31 0a 20 20 20 20 20 20 20 20 |, #1<<1. |
000003a0 45 4f 52 20 20 20 20 20 24 72 2c 20 24 72 2c 20 |EOR $r, $r, |
000003b0 23 31 3c 3c 31 0a 20 20 20 20 20 20 20 20 45 4f |#1<<1. EO|
000003c0 52 4e 45 20 20 20 24 72 2c 20 24 72 2c 20 23 31 |RNE $r, $r, #1|
000003d0 3c 3c 30 20 20 20 20 20 20 20 20 20 20 20 3b 6e |<<0 ;n|
000003e0 62 20 61 6e 20 72 62 62 63 20 63 61 72 72 79 20 |b an rbbc carry |
000003f0 77 69 6c 6c 20 61 75 74 6f 6d 61 74 69 63 61 6c |will automatical|
00000400 6c 79 20 63 61 75 73 65 20 61 20 77 72 61 70 20 |ly cause a wrap |
00000410 61 72 6f 75 6e 64 20 62 61 63 6b 20 74 6f 20 7a |around back to z|
00000420 65 72 6f 0a 0a 30 0a 0a 20 20 20 20 20 20 20 20 |ero..0.. |
00000430 4d 45 4e 44 0a 0a 0a 0a 3b 20 64 69 76 31 36 0a |MEND....; div16.|
00000440 3b 20 61 73 73 75 6d 65 73 20 61 62 73 20 6e 75 |; assumes abs nu|
00000450 6d 62 65 72 20 3c 20 36 35 35 33 36 20 2a 20 61 |mber < 65536 * a|
00000460 62 73 20 64 69 76 69 73 6f 72 2e 0a 3b 20 63 61 |bs divisor..; ca|
00000470 6c 63 75 6c 61 74 65 73 20 69 6e 74 65 67 65 72 |lculates integer|
00000480 20 70 61 72 74 20 6f 66 20 36 35 35 33 36 2a 6e | part of 65536*n|
00000490 75 6d 62 65 72 2f 64 69 76 69 73 6f 72 2c 20 61 |umber/divisor, a|
000004a0 73 20 61 20 73 69 67 6e 65 64 20 33 32 20 62 69 |s a signed 32 bi|
000004b0 74 20 6e 75 6d 62 65 72 2e 0a 3b 20 75 73 65 64 |t number..; used|
000004c0 20 69 6e 20 6d 61 74 72 69 78 20 69 6e 76 65 72 | in matrix inver|
000004d0 73 69 6f 6e 20 72 6f 75 74 69 6e 65 20 77 68 65 |sion routine whe|
000004e0 72 65 20 69 74 20 69 73 20 6e 65 63 65 73 73 61 |re it is necessa|
000004f0 72 79 20 74 6f 20 64 69 76 69 64 65 20 74 77 6f |ry to divide two|
00000500 20 66 69 78 65 64 20 70 6f 69 6e 74 20 6e 75 6d | fixed point num|
00000510 62 65 72 73 20 28 31 36 20 62 69 74 20 66 72 61 |bers (16 bit fra|
00000520 63 74 69 6f 6e 29 2e 0a 3b 20 69 66 20 72 61 6e |ction)..; if ran|
00000530 67 65 20 63 68 65 63 6b 20 6f 6e 20 61 62 6f 76 |ge check on abov|
00000540 65 20 61 73 73 75 6d 70 74 69 6f 6e 20 69 73 20 |e assumption is |
00000550 72 65 71 75 69 72 65 64 2c 20 74 68 65 20 63 61 |required, the ca|
00000560 6c 6c 65 72 20 6d 75 73 74 20 70 65 72 66 6f 72 |ller must perfor|
00000570 6d 20 69 74 2e 0a 3b 20 49 74 20 74 61 6b 65 73 |m it..; It takes|
00000580 20 35 20 70 61 72 61 6d 65 74 65 72 73 20 2d 20 | 5 parameters - |
00000590 61 6c 6c 20 72 65 67 69 73 74 65 72 20 6e 61 6d |all register nam|
000005a0 65 73 2e 0a 3b 0a 3b 20 24 6e 75 6d 62 65 72 3a |es..;.; $number:|
000005b0 20 20 20 20 20 20 6e 75 6d 62 65 72 0a 3b 20 24 | number.; $|
000005c0 64 69 76 69 73 6f 72 3a 20 20 20 20 20 64 69 76 |divisor: div|
000005d0 69 73 6f 72 20 2d 20 73 69 67 6e 20 6f 66 20 64 |isor - sign of d|
000005e0 69 76 69 73 6f 72 20 6d 61 79 20 62 65 20 63 6f |ivisor may be co|
000005f0 72 72 75 70 74 65 64 0a 3b 20 24 6e 75 6d 3a 20 |rrupted.; $num: |
00000600 20 20 20 20 20 20 20 20 73 63 72 61 74 63 68 20 | scratch |
00000610 26 20 72 65 73 75 6c 74 20 2d 20 6d 61 79 20 62 |& result - may b|
00000620 65 20 74 68 65 20 73 61 6d 65 20 61 73 20 24 6e |e the same as $n|
00000630 75 6d 62 65 72 0a 3b 20 24 73 69 67 6e 3a 20 20 |umber.; $sign: |
00000640 20 20 20 20 20 20 73 63 72 61 74 63 68 0a 3b 20 | scratch.; |
00000650 24 72 65 6d 3a 20 20 20 20 20 20 20 20 20 73 63 |$rem: sc|
00000660 72 61 74 63 68 0a 3b 0a 20 20 20 20 20 20 20 20 |ratch.;. |
00000670 4d 41 43 52 4f 0a 24 6c 61 62 65 6c 20 20 64 69 |MACRO.$label di|
00000680 76 31 36 20 20 20 24 6e 75 6d 62 65 72 2c 20 24 |v16 $number, $|
00000690 64 69 76 69 73 6f 72 2c 20 24 6e 75 6d 2c 20 24 |divisor, $num, $|
000006a0 73 69 67 6e 2c 20 24 72 65 6d 0a 0a 20 20 20 20 |sign, $rem.. |
000006b0 20 20 20 20 41 53 53 45 52 54 20 20 24 6e 75 6d | ASSERT $num|
000006c0 20 3c 3e 20 24 64 69 76 69 73 6f 72 0a 20 20 20 | <> $divisor. |
000006d0 20 20 20 20 20 41 53 53 45 52 54 20 20 24 6e 75 | ASSERT $nu|
000006e0 6d 20 3c 3e 20 24 73 69 67 6e 0a 20 20 20 20 20 |m <> $sign. |
000006f0 20 20 20 41 53 53 45 52 54 20 20 24 6e 75 6d 20 | ASSERT $num |
00000700 3c 3e 20 24 72 65 6d 0a 20 20 20 20 20 20 20 20 |<> $rem. |
00000710 41 53 53 45 52 54 20 20 24 6e 75 6d 62 65 72 20 |ASSERT $number |
00000720 3c 3e 20 24 64 69 76 69 73 6f 72 0a 20 20 20 20 |<> $divisor. |
00000730 20 20 20 20 41 53 53 45 52 54 20 20 24 6e 75 6d | ASSERT $num|
00000740 62 65 72 20 3c 3e 20 24 73 69 67 6e 0a 20 20 20 |ber <> $sign. |
00000750 20 20 20 20 20 41 53 53 45 52 54 20 20 24 6e 75 | ASSERT $nu|
00000760 6d 62 65 72 20 3c 3e 20 24 72 65 6d 0a 20 20 20 |mber <> $rem. |
00000770 20 20 20 20 20 41 53 53 45 52 54 20 20 24 64 69 | ASSERT $di|
00000780 76 69 73 6f 72 20 3c 3e 20 24 73 69 67 6e 0a 20 |visor <> $sign. |
00000790 20 20 20 20 20 20 20 41 53 53 45 52 54 20 20 24 | ASSERT $|
000007a0 64 69 76 69 73 6f 72 20 3c 3e 20 24 72 65 6d 0a |divisor <> $rem.|
000007b0 20 20 20 20 20 20 20 20 41 53 53 45 52 54 20 20 | ASSERT |
000007c0 24 73 69 67 6e 20 3c 3e 20 24 72 65 6d 0a 0a 20 |$sign <> $rem.. |
000007d0 20 20 20 20 20 20 20 4c 43 4c 41 20 20 20 20 63 | LCLA c|
000007e0 6f 75 6e 74 65 72 0a 63 6f 75 6e 74 65 72 20 53 |ounter.counter S|
000007f0 45 54 41 20 20 20 20 33 32 0a 0a 24 6c 61 62 65 |ETA 32..$labe|
00000800 6c 20 20 4d 4f 56 53 20 20 20 20 24 72 65 6d 2c |l MOVS $rem,|
00000810 20 24 64 69 76 69 73 6f 72 2c 20 4c 53 4c 20 23 | $divisor, LSL #|
00000820 31 0a 20 20 20 20 20 20 20 20 52 53 42 43 53 20 |1. RSBCS |
00000830 20 20 24 64 69 76 69 73 6f 72 2c 20 24 64 69 76 | $divisor, $div|
00000840 69 73 6f 72 2c 20 23 30 0a 20 20 20 20 20 20 20 |isor, #0. |
00000850 20 41 44 43 20 20 20 20 20 24 73 69 67 6e 2c 20 | ADC $sign, |
00000860 24 73 69 67 6e 2c 20 24 73 69 67 6e 20 20 20 20 |$sign, $sign |
00000870 20 20 20 20 20 20 20 20 20 3b 31 73 74 20 33 20 | ;1st 3 |
00000880 69 6e 73 74 72 75 63 74 69 6f 6e 73 20 61 6c 6c |instructions all|
00000890 6f 77 20 73 65 74 74 69 6e 67 20 6f 66 20 6c 6f |ow setting of lo|
000008a0 77 20 62 69 74 20 73 69 67 6e 20 61 73 20 65 69 |w bit sign as ei|
000008b0 74 68 65 72 20 30 0a 20 20 20 20 20 20 20 20 20 |ther 0. |
000008c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
000008e0 20 20 20 20 20 20 20 3b 6f 72 20 31 20 61 63 63 | ;or 1 acc|
000008f0 6f 72 64 69 6e 67 20 74 6f 20 73 69 67 6e 20 6f |ording to sign o|
00000900 66 20 64 69 76 69 73 6f 72 2c 20 69 6e 20 6f 6e |f divisor, in on|
00000910 6c 79 20 31 20 69 6e 73 74 72 75 63 74 69 6f 6e |ly 1 instruction|
00000920 2e 0a 20 20 20 20 20 20 20 20 54 45 51 20 20 20 |.. TEQ |
00000930 20 20 24 6e 75 6d 62 65 72 2c 20 23 30 0a 20 20 | $number, #0. |
00000940 20 20 20 20 20 20 52 53 42 4d 49 20 20 20 24 6e | RSBMI $n|
00000950 75 6d 2c 20 24 6e 75 6d 62 65 72 2c 20 23 30 0a |um, $number, #0.|
00000960 20 20 20 20 20 20 20 20 5b 20 20 20 20 20 20 20 | [ |
00000970 24 6e 75 6d 20 3c 3e 20 24 6e 75 6d 62 65 72 0a |$num <> $number.|
00000980 20 20 20 20 20 20 20 20 4d 4f 56 50 4c 20 20 20 | MOVPL |
00000990 24 6e 75 6d 2c 20 24 6e 75 6d 62 65 72 20 20 20 |$num, $number |
000009a0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
000009b0 3b 6f 6e 6c 79 20 61 73 73 65 6d 62 6c 65 20 74 |;only assemble t|
000009c0 68 69 73 20 63 61 73 65 20 69 66 20 72 65 67 73 |his case if regs|
000009d0 20 64 69 66 66 65 72 65 6e 74 2c 20 61 73 20 69 | different, as i|
000009e0 73 20 6f 74 68 65 72 77 69 73 65 20 61 20 6e 6f |s otherwise a no|
000009f0 70 2e 0a 20 20 20 20 20 20 20 20 5d 0a 20 20 20 |p.. ]. |
00000a00 20 20 20 20 20 45 4f 52 4d 49 20 20 20 24 73 69 | EORMI $si|
00000a10 67 6e 2c 20 24 73 69 67 6e 2c 20 23 31 0a 0a 20 |gn, $sign, #1.. |
00000a20 20 20 20 20 20 20 20 4d 4f 56 20 20 20 20 20 24 | MOV $|
00000a30 72 65 6d 2c 20 24 6e 75 6d 2c 20 4c 53 52 20 23 |rem, $num, LSR #|
00000a40 31 36 0a 20 20 20 20 20 20 20 20 4d 4f 56 20 20 |16. MOV |
00000a50 20 20 20 24 6e 75 6d 2c 20 24 6e 75 6d 2c 20 4c | $num, $num, L|
00000a60 53 4c 20 23 31 36 0a 0a 20 20 20 20 20 20 20 20 |SL #16.. |
00000a70 57 48 49 4c 45 20 20 20 63 6f 75 6e 74 65 72 20 |WHILE counter |
00000a80 3e 20 30 20 20 20 20 20 20 20 20 20 20 20 20 20 |> 0 |
00000a90 20 20 20 20 20 20 20 20 3b 75 6e 77 6f 75 6e 64 | ;unwound|
00000aa0 20 6c 6f 6f 70 20 75 73 65 73 20 61 62 6f 75 74 | loop uses about|
00000ab0 20 36 30 30 20 62 79 74 65 73 20 65 78 74 72 61 | 600 bytes extra|
00000ac0 20 6d 65 6d 6f 72 79 0a 20 20 20 20 20 20 20 20 | memory. |
00000ad0 4d 4f 56 53 20 20 20 20 24 6e 75 6d 2c 20 24 6e |MOVS $num, $n|
00000ae0 75 6d 2c 20 41 53 4c 20 23 31 20 20 20 20 20 20 |um, ASL #1 |
00000af0 20 20 20 20 20 20 20 20 3b 73 70 65 65 64 20 69 | ;speed i|
00000b00 6e 63 72 65 61 73 65 20 28 41 52 4d 33 29 20 66 |ncrease (ARM3) f|
00000b10 72 6f 6d 20 61 62 6f 75 74 20 31 2e 32 37 65 2d |rom about 1.27e-|
00000b20 35 20 74 6f 20 2e 37 35 65 2d 35 20 73 65 63 6f |5 to .75e-5 seco|
00000b30 6e 64 73 0a 20 20 20 20 20 20 20 20 41 44 43 20 |nds. ADC |
00000b40 20 20 20 20 24 72 65 6d 2c 20 24 72 65 6d 2c 20 | $rem, $rem, |
00000b50 24 72 65 6d 0a 20 20 20 20 20 20 20 20 43 4d 50 |$rem. CMP|
00000b60 20 20 20 20 20 24 72 65 6d 2c 20 24 64 69 76 69 | $rem, $divi|
00000b70 73 6f 72 0a 20 20 20 20 20 20 20 20 53 55 42 48 |sor. SUBH|
00000b80 53 20 20 20 24 72 65 6d 2c 20 24 72 65 6d 2c 20 |S $rem, $rem, |
00000b90 24 64 69 76 69 73 6f 72 0a 20 20 20 20 20 20 20 |$divisor. |
00000ba0 20 4f 52 52 48 53 20 20 20 24 6e 75 6d 2c 20 24 | ORRHS $num, $|
00000bb0 6e 75 6d 2c 20 23 31 0a 63 6f 75 6e 74 65 72 20 |num, #1.counter |
00000bc0 53 45 54 41 20 20 20 20 63 6f 75 6e 74 65 72 2d |SETA counter-|
00000bd0 31 0a 20 20 20 20 20 20 20 20 57 45 4e 44 0a 0a |1. WEND..|
00000be0 20 20 20 20 20 20 20 20 43 4d 50 20 20 20 20 20 | CMP |
00000bf0 24 72 65 6d 2c 20 24 64 69 76 69 73 6f 72 2c 20 |$rem, $divisor, |
00000c00 41 53 52 20 23 31 0a 20 20 20 20 20 20 20 20 41 |ASR #1. A|
00000c10 44 44 47 45 20 20 20 24 6e 75 6d 2c 20 24 6e 75 |DDGE $num, $nu|
00000c20 6d 2c 20 23 31 0a 20 20 20 20 20 20 20 20 54 53 |m, #1. TS|
00000c30 54 20 20 20 20 20 24 73 69 67 6e 2c 20 23 31 0a |T $sign, #1.|
00000c40 20 20 20 20 20 20 20 20 52 53 42 4e 45 20 20 20 | RSBNE |
00000c50 24 6e 75 6d 2c 20 24 6e 75 6d 2c 20 23 30 0a 0a |$num, $num, #0..|
00000c60 20 20 20 20 20 20 20 20 4d 45 4e 44 0a 0a 0a 0a | MEND....|
00000c70 3b 20 6d 75 6c 31 36 0a 3b 20 6d 75 6c 74 69 70 |; mul16.; multip|
00000c80 6c 69 63 61 74 69 6f 6e 20 6f 66 20 61 6e 20 69 |lication of an i|
00000c90 6e 74 65 67 65 72 20 78 20 62 79 20 61 20 31 36 |nteger x by a 16|
00000ca0 2d 62 69 74 20 66 69 78 65 64 20 70 6f 69 6e 74 |-bit fixed point|
00000cb0 20 6e 75 6d 62 65 72 20 61 2c 20 77 69 74 68 20 | number a, with |
00000cc0 6e 6f 20 72 65 73 74 72 69 63 74 69 6f 6e 73 20 |no restrictions |
00000cd0 6f 6e 20 78 20 6f 72 20 61 0a 3b 20 6f 74 68 65 |on x or a.; othe|
00000ce0 72 20 74 68 61 6e 20 74 68 61 74 20 78 2a 61 2f |r than that x*a/|
00000cf0 36 35 35 33 36 20 6d 75 73 74 20 66 69 74 20 69 |65536 must fit i|
00000d00 6e 74 6f 20 61 20 73 69 67 6e 65 64 20 33 32 2d |nto a signed 32-|
00000d10 62 69 74 20 72 65 70 72 65 73 65 6e 74 61 74 69 |bit representati|
00000d20 6f 6e 2e 0a 3b 20 63 61 6c 63 75 6c 61 74 65 73 |on..; calculates|
00000d30 20 72 3d 78 2a 61 2f 36 35 35 33 36 0a 3b 20 49 | r=x*a/65536.; I|
00000d40 74 20 74 61 6b 65 73 20 36 20 70 61 72 61 6d 65 |t takes 6 parame|
00000d50 74 65 72 73 20 2d 20 61 6c 6c 20 72 65 67 69 73 |ters - all regis|
00000d60 74 65 72 20 6e 61 6d 65 73 2e 0a 3b 0a 3b 20 24 |ter names..;.; $|
00000d70 78 3a 20 20 20 78 0a 3b 20 24 61 3a 20 20 20 61 |x: x.; $a: a|
00000d80 20 2d 20 61 20 77 69 6c 6c 20 62 65 20 63 6f 72 | - a will be cor|
00000d90 72 75 70 74 65 64 0a 3b 20 24 72 3a 20 20 20 72 |rupted.; $r: r|
00000da0 65 73 75 6c 74 20 2d 20 6d 61 79 20 62 65 20 74 |esult - may be t|
00000db0 68 65 20 73 61 6d 65 20 61 73 20 24 78 0a 3b 20 |he same as $x.; |
00000dc0 24 75 3a 20 20 20 73 63 72 61 74 63 68 0a 3b 20 |$u: scratch.; |
00000dd0 24 76 3a 20 20 20 73 63 72 61 74 63 68 0a 3b 20 |$v: scratch.; |
00000de0 24 77 3a 20 20 20 73 63 72 61 74 63 68 0a 3b 0a |$w: scratch.;.|
00000df0 20 20 20 20 20 20 20 20 4d 41 43 52 4f 0a 24 6c | MACRO.$l|
00000e00 61 62 65 6c 20 20 6d 75 6c 31 36 20 20 20 24 78 |abel mul16 $x|
00000e10 2c 20 24 61 2c 20 24 72 2c 20 24 75 2c 20 24 76 |, $a, $r, $u, $v|
00000e20 2c 20 24 77 0a 0a 20 20 20 20 20 20 20 20 41 53 |, $w.. AS|
00000e30 53 45 52 54 20 20 24 72 20 3c 3e 20 24 61 0a 20 |SERT $r <> $a. |
00000e40 20 20 20 20 20 20 20 41 53 53 45 52 54 20 20 24 | ASSERT $|
00000e50 72 20 3c 3e 20 24 75 0a 20 20 20 20 20 20 20 20 |r <> $u. |
00000e60 41 53 53 45 52 54 20 20 24 72 20 3c 3e 20 24 76 |ASSERT $r <> $v|
00000e70 0a 20 20 20 20 20 20 20 20 41 53 53 45 52 54 20 |. ASSERT |
00000e80 20 24 72 20 3c 3e 20 24 77 0a 20 20 20 20 20 20 | $r <> $w. |
00000e90 20 20 41 53 53 45 52 54 20 20 24 78 20 3c 3e 20 | ASSERT $x <> |
00000ea0 24 61 0a 20 20 20 20 20 20 20 20 41 53 53 45 52 |$a. ASSER|
00000eb0 54 20 20 24 78 20 3c 3e 20 24 75 0a 20 20 20 20 |T $x <> $u. |
00000ec0 20 20 20 20 41 53 53 45 52 54 20 20 24 78 20 3c | ASSERT $x <|
00000ed0 3e 20 24 76 0a 20 20 20 20 20 20 20 20 41 53 53 |> $v. ASS|
00000ee0 45 52 54 20 20 24 78 20 3c 3e 20 24 77 0a 20 20 |ERT $x <> $w. |
00000ef0 20 20 20 20 20 20 41 53 53 45 52 54 20 20 24 61 | ASSERT $a|
00000f00 20 3c 3e 20 24 75 0a 20 20 20 20 20 20 20 20 41 | <> $u. A|
00000f10 53 53 45 52 54 20 20 24 61 20 3c 3e 20 24 76 0a |SSERT $a <> $v.|
00000f20 20 20 20 20 20 20 20 20 41 53 53 45 52 54 20 20 | ASSERT |
00000f30 24 61 20 3c 3e 20 24 77 0a 20 20 20 20 20 20 20 |$a <> $w. |
00000f40 20 41 53 53 45 52 54 20 20 24 75 20 3c 3e 20 24 | ASSERT $u <> $|
00000f50 76 0a 20 20 20 20 20 20 20 20 41 53 53 45 52 54 |v. ASSERT|
00000f60 20 20 24 75 20 3c 3e 20 24 77 0a 20 20 20 20 20 | $u <> $w. |
00000f70 20 20 20 41 53 53 45 52 54 20 20 24 76 20 3c 3e | ASSERT $v <>|
00000f80 20 24 77 0a 0a 24 6c 61 62 65 6c 20 20 4d 4f 56 | $w..$label MOV|
00000f90 53 20 20 20 20 24 77 2c 20 24 61 2c 20 4c 53 4c |S $w, $a, LSL|
00000fa0 20 23 31 0a 20 20 20 20 20 20 20 20 52 53 42 43 | #1. RSBC|
00000fb0 53 20 20 20 24 61 2c 20 24 61 2c 20 23 30 0a 20 |S $a, $a, #0. |
00000fc0 20 20 20 20 20 20 20 54 45 51 20 20 20 20 20 24 | TEQ $|
00000fd0 78 2c 20 23 30 0a 20 20 20 20 20 20 20 20 52 53 |x, #0. RS|
00000fe0 42 4d 49 20 20 20 24 72 2c 20 24 78 2c 20 23 30 |BMI $r, $x, #0|
00000ff0 0a 20 20 20 20 20 20 20 20 5b 20 20 20 20 20 20 |. [ |
00001000 20 24 72 20 3c 3e 20 24 78 0a 20 20 20 20 20 20 | $r <> $x. |
00001010 20 20 4d 4f 56 50 4c 20 20 20 24 72 2c 20 24 78 | MOVPL $r, $x|
00001020 0a 20 20 20 20 20 20 20 20 5d 20 20 20 20 20 20 |. ] |
00001030 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00001040 20 3b 6e 6f 77 20 68 61 76 65 20 43 20 62 69 74 | ;now have C bit|
00001050 20 73 65 74 20 69 66 66 20 61 3c 30 2c 20 4e 20 | set iff a<0, N |
00001060 62 69 74 20 73 65 74 20 69 66 66 20 78 3c 30 0a |bit set iff x<0.|
00001070 20 20 20 20 20 20 20 20 4d 4f 56 20 20 20 20 20 | MOV |
00001080 24 77 2c 20 70 63 2c 20 4c 53 52 20 23 33 31 0a |$w, pc, LSR #31.|
00001090 20 20 20 20 20 20 20 20 4d 4f 56 20 20 20 20 20 | MOV |
000010a0 24 77 2c 20 24 77 2c 20 4c 53 4c 20 23 32 38 20 |$w, $w, LSL #28 |
000010b0 3b 67 65 74 20 77 3d 28 32 5e 32 38 29 2a 4e 20 |;get w=(2^28)*N |
000010c0 7b 4e 20 69 73 20 62 33 31 2c 20 56 20 69 73 20 |{N is b31, V is |
000010d0 62 32 38 2c 20 43 20 69 73 20 62 32 39 20 69 6e |b28, C is b29 in|
000010e0 20 70 63 2f 70 73 72 7d 0a 20 20 20 20 20 20 20 | pc/psr}. |
000010f0 20 54 45 51 50 20 20 20 20 24 77 2c 20 70 63 2c | TEQP $w, pc,|
00001100 20 4c 53 52 20 23 31 20 20 3b 45 4f 52 20 77 20 | LSR #1 ;EOR w |
00001110 69 6e 74 6f 20 70 63 2f 70 73 72 20 7b 69 65 20 |into pc/psr {ie |
00001120 4e 20 45 4f 52 20 43 20 69 73 20 70 75 74 20 69 |N EOR C is put i|
00001130 6e 74 6f 20 56 7d 20 20 2d 20 74 68 69 73 20 69 |nto V} - this i|
00001140 73 20 61 20 77 61 79 20 6f 66 20 73 74 6f 72 69 |s a way of stori|
00001150 6e 67 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 |ng. |
00001160 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00001170 20 20 20 3b 73 69 67 6e 20 6f 66 20 72 65 73 75 | ;sign of resu|
00001180 6c 74 20 69 6e 20 6f 76 65 72 66 6c 6f 77 20 66 |lt in overflow f|
00001190 6c 61 67 2c 20 73 61 76 69 6e 67 20 6f 6e 20 61 |lag, saving on a|
000011a0 20 72 65 67 69 73 74 65 72 0a 20 20 20 20 20 20 | register. |
000011b0 20 20 4d 4f 56 20 20 20 20 20 24 77 2c 20 24 72 | MOV $w, $r|
000011c0 2c 20 4c 53 52 20 23 31 36 0a 20 20 20 20 20 20 |, LSR #16. |
000011d0 20 20 42 49 43 20 20 20 20 20 24 72 2c 20 24 72 | BIC $r, $r|
000011e0 2c 20 24 77 2c 20 4c 53 4c 20 23 31 36 0a 20 20 |, $w, LSL #16. |
000011f0 20 20 20 20 20 20 4d 4f 56 20 20 20 20 20 24 76 | MOV $v|
00001200 2c 20 24 61 2c 20 4c 53 52 20 23 31 36 0a 20 20 |, $a, LSR #16. |
00001210 20 20 20 20 20 20 42 49 43 20 20 20 20 20 24 61 | BIC $a|
00001220 2c 20 24 61 2c 20 24 76 2c 20 4c 53 4c 20 23 31 |, $a, $v, LSL #1|
00001230 36 0a 20 20 20 20 20 20 20 20 4d 55 4c 20 20 20 |6. MUL |
00001240 20 20 24 75 2c 20 24 61 2c 20 24 72 0a 20 20 20 | $u, $a, $r. |
00001250 20 20 20 20 20 54 53 54 20 20 20 20 20 24 75 2c | TST $u,|
00001260 20 23 31 3c 3c 31 35 20 20 20 20 20 20 3b 6e 6f | #1<<15 ;no|
00001270 74 69 63 65 20 74 68 69 73 20 69 73 20 74 68 65 |tice this is the|
00001280 20 6f 6e 6c 79 20 6f 70 65 72 61 74 69 6f 6e 20 | only operation |
00001290 61 6c 74 65 72 69 6e 67 20 70 73 72 20 26 20 74 |altering psr & t|
000012a0 68 61 74 20 69 74 20 77 69 6c 6c 20 6e 6f 74 20 |hat it will not |
000012b0 63 6f 72 72 75 70 74 20 56 0a 20 20 20 20 20 20 |corrupt V. |
000012c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
000012d0 20 20 20 20 20 20 20 20 20 20 3b 6e 6f 74 65 20 | ;note |
000012e0 69 74 20 77 69 6c 6c 20 63 6f 72 72 75 70 74 20 |it will corrupt |
000012f0 43 2c 20 61 73 20 69 6d 6d 65 64 69 61 74 65 20 |C, as immediate |
00001300 6f 70 65 72 61 6e 64 20 33 32 37 36 38 20 72 65 |operand 32768 re|
00001310 71 75 69 72 65 73 20 61 20 73 68 69 66 74 0a 20 |quires a shift. |
00001320 20 20 20 20 20 20 20 4d 4f 56 20 20 20 20 20 24 | MOV $|
00001330 75 2c 20 24 75 2c 20 4c 53 52 20 23 31 36 0a 20 |u, $u, LSR #16. |
00001340 20 20 20 20 20 20 20 41 44 44 4e 45 20 20 20 24 | ADDNE $|
00001350 75 2c 20 24 75 2c 20 23 31 0a 20 20 20 20 20 20 |u, $u, #1. |
00001360 20 20 4d 4c 41 20 20 20 20 20 24 75 2c 20 24 72 | MLA $u, $r|
00001370 2c 20 24 76 2c 20 24 75 09 3b 36 2f 39 2f 39 34 |, $v, $u.;6/9/94|
00001380 20 2d 20 72 65 76 65 72 73 65 20 76 20 26 20 72 | - reverse v & r|
00001390 20 74 6f 20 6f 70 74 69 6d 69 73 65 20 66 6f 72 | to optimise for|
000013a0 20 61 72 67 75 6d 65 6e 74 20 61 20 73 6d 61 6c | argument a smal|
000013b0 6c 0a 20 20 20 20 20 20 20 20 4d 4c 41 20 20 20 |l. MLA |
000013c0 20 20 24 75 2c 20 24 61 2c 20 24 77 2c 20 24 75 | $u, $a, $w, $u|
000013d0 0a 20 20 20 20 20 20 20 20 4d 55 4c 20 20 20 20 |. MUL |
000013e0 20 24 72 2c 20 24 77 2c 20 24 76 09 3b 36 2f 39 | $r, $w, $v.;6/9|
000013f0 2f 39 34 20 2d 20 72 65 76 65 72 73 65 20 76 20 |/94 - reverse v |
00001400 26 20 77 20 74 6f 20 6f 70 74 69 6d 69 73 65 20 |& w to optimise |
00001410 66 6f 72 20 61 72 67 75 6d 65 6e 74 20 61 20 73 |for argument a s|
00001420 6d 61 6c 6c 0a 20 20 20 20 20 20 20 20 41 44 44 |mall. ADD|
00001430 20 20 20 20 20 24 72 2c 20 24 75 2c 20 24 72 2c | $r, $u, $r,|
00001440 20 4c 53 4c 20 23 31 36 0a 20 20 20 20 20 20 20 | LSL #16. |
00001450 20 52 53 42 56 53 20 20 20 24 72 2c 20 24 72 2c | RSBVS $r, $r,|
00001460 20 23 30 0a 0a 20 20 20 20 20 20 20 20 4d 45 4e | #0.. MEN|
00001470 44 0a 0a 0a 0a 3b 20 6d 75 6c 31 36 63 0a 3b 20 |D....; mul16c.; |
00001480 6d 75 6c 74 69 70 6c 69 63 61 74 69 6f 6e 20 6f |multiplication o|
00001490 66 20 61 6e 20 69 6e 74 65 67 65 72 20 78 20 62 |f an integer x b|
000014a0 79 20 61 20 31 36 2d 62 69 74 20 66 69 78 65 64 |y a 16-bit fixed|
000014b0 20 70 6f 69 6e 74 20 6e 75 6d 62 65 72 20 61 2c | point number a,|
000014c0 20 77 68 65 72 65 20 61 20 69 73 20 61 20 63 6f | where a is a co|
000014d0 6e 74 72 61 63 74 69 6f 6e 0a 3b 20 69 65 20 63 |ntraction.; ie c|
000014e0 61 6c 63 75 6c 61 74 65 73 20 72 3d 78 2a 61 2f |alculates r=x*a/|
000014f0 36 35 35 33 36 2c 20 61 73 73 75 6d 69 6e 67 3a |65536, assuming:|
00001500 20 61 62 73 20 61 20 3c 20 36 35 35 33 36 0a 3b | abs a < 65536.;|
00001510 20 69 66 20 74 68 65 20 70 6f 73 73 69 62 69 6c | if the possibil|
00001520 69 74 79 20 65 78 69 73 74 73 20 74 68 61 74 20 |ity exists that |
00001530 61 3e 3d 36 35 35 33 36 2c 20 63 61 6c 6c 65 72 |a>=65536, caller|
00001540 20 73 68 6f 75 6c 64 20 63 68 65 63 6b 20 74 68 | should check th|
00001550 69 73 20 26 20 65 69 74 68 65 72 20 6e 6f 74 20 |is & either not |
00001560 63 61 6c 6c 20 72 6f 75 74 69 6e 65 2c 20 6f 72 |call routine, or|
00001570 20 73 65 74 20 61 3d 36 35 35 33 35 0a 3b 20 49 | set a=65535.; I|
00001580 74 20 74 61 6b 65 73 20 34 20 70 61 72 61 6d 65 |t takes 4 parame|
00001590 74 65 72 73 20 2d 20 61 6c 6c 20 72 65 67 69 73 |ters - all regis|
000015a0 74 65 72 20 6e 61 6d 65 73 2e 0a 3b 0a 3b 20 24 |ter names..;.; $|
000015b0 78 3a 20 20 20 78 0a 3b 20 24 61 3a 20 20 20 61 |x: x.; $a: a|
000015c0 20 2d 20 72 65 71 75 69 72 65 20 61 62 73 20 61 | - require abs a|
000015d0 20 3c 36 35 35 33 36 2c 20 61 20 77 69 6c 6c 20 | <65536, a will |
000015e0 62 65 20 63 6f 72 72 75 70 74 65 64 0a 3b 20 24 |be corrupted.; $|
000015f0 72 3a 20 20 20 72 65 73 75 6c 74 20 2d 20 6d 61 |r: result - ma|
00001600 79 20 62 65 20 74 68 65 20 73 61 6d 65 20 61 73 |y be the same as|
00001610 20 24 78 0a 3b 20 24 77 3a 20 20 20 73 63 72 61 | $x.; $w: scra|
00001620 74 63 68 0a 3b 0a 20 20 20 20 20 20 20 20 4d 41 |tch.;. MA|
00001630 43 52 4f 0a 24 6c 61 62 65 6c 20 20 6d 75 6c 31 |CRO.$label mul1|
00001640 36 63 20 20 24 78 2c 20 24 61 2c 20 24 72 2c 20 |6c $x, $a, $r, |
00001650 24 77 0a 0a 20 20 20 20 20 20 20 20 41 53 53 45 |$w.. ASSE|
00001660 52 54 20 20 24 72 20 3c 3e 20 24 61 0a 20 20 20 |RT $r <> $a. |
00001670 20 20 20 20 20 41 53 53 45 52 54 20 20 24 72 20 | ASSERT $r |
00001680 3c 3e 20 24 77 0a 20 20 20 20 20 20 20 20 41 53 |<> $w. AS|
00001690 53 45 52 54 20 20 24 78 20 3c 3e 20 24 61 0a 20 |SERT $x <> $a. |
000016a0 20 20 20 20 20 20 20 41 53 53 45 52 54 20 20 24 | ASSERT $|
000016b0 78 20 3c 3e 20 24 77 0a 20 20 20 20 20 20 20 20 |x <> $w. |
000016c0 41 53 53 45 52 54 20 20 24 61 20 3c 3e 20 24 77 |ASSERT $a <> $w|
000016d0 0a 0a 24 6c 61 62 65 6c 20 20 4d 4f 56 53 20 20 |..$label MOVS |
000016e0 20 20 24 77 2c 20 24 61 2c 20 4c 53 4c 20 23 31 | $w, $a, LSL #1|
000016f0 0a 20 20 20 20 20 20 20 20 52 53 42 43 53 20 20 |. RSBCS |
00001700 20 24 61 2c 20 24 61 2c 20 23 30 0a 20 20 20 20 | $a, $a, #0. |
00001710 20 20 20 20 54 45 51 20 20 20 20 20 24 78 2c 20 | TEQ $x, |
00001720 23 30 0a 20 20 20 20 20 20 20 20 52 53 42 4d 49 |#0. RSBMI|
00001730 20 20 20 24 72 2c 20 24 78 2c 20 23 30 0a 20 20 | $r, $x, #0. |
00001740 20 20 20 20 20 20 5b 20 20 20 20 20 20 20 24 72 | [ $r|
00001750 20 3c 3e 20 24 78 0a 20 20 20 20 20 20 20 20 4d | <> $x. M|
00001760 4f 56 50 4c 20 20 20 24 72 2c 20 24 78 0a 20 20 |OVPL $r, $x. |
00001770 20 20 20 20 20 20 5d 0a 20 20 20 20 20 20 20 20 | ]. |
00001780 4d 4f 56 20 20 20 20 20 24 77 2c 20 70 63 2c 20 |MOV $w, pc, |
00001790 4c 53 52 20 23 33 31 20 3b 73 65 65 20 6d 75 6c |LSR #31 ;see mul|
000017a0 31 36 20 61 62 6f 76 65 2c 20 66 6f 72 20 63 6f |16 above, for co|
000017b0 6d 6d 65 6e 74 73 20 72 65 20 74 68 69 73 20 70 |mments re this p|
000017c0 61 72 74 0a 20 20 20 20 20 20 20 20 4d 4f 56 20 |art. MOV |
000017d0 20 20 20 20 24 77 2c 20 24 77 2c 20 4c 53 4c 20 | $w, $w, LSL |
000017e0 23 32 38 0a 20 20 20 20 20 20 20 20 54 45 51 50 |#28. TEQP|
000017f0 20 20 20 20 24 77 2c 20 70 63 2c 20 4c 53 52 20 | $w, pc, LSR |
00001800 23 31 0a 0a 20 20 20 20 20 20 20 20 54 53 54 20 |#1.. TST |
00001810 20 20 20 20 24 61 2c 20 23 31 3c 3c 31 36 20 20 | $a, #1<<16 |
00001820 20 20 20 20 3b 62 6f 64 67 65 20 74 6f 20 61 6c | ;bodge to al|
00001830 6c 6f 77 20 63 6f 64 65 20 74 6f 20 66 75 6e 63 |low code to func|
00001840 74 69 6f 6e 20 69 66 20 24 61 20 69 73 20 75 70 |tion if $a is up|
00001850 74 6f 20 32 2a 36 35 35 33 36 2d 31 0a 20 20 20 |to 2*65536-1. |
00001860 20 20 20 20 20 4d 4f 56 4e 45 20 20 20 24 72 2c | MOVNE $r,|
00001870 20 24 72 2c 20 4c 53 4c 20 23 31 20 20 3b 63 61 | $r, LSL #1 ;ca|
00001880 6e 20 6f 63 63 75 72 20 69 6e 20 61 20 63 6f 6e |n occur in a con|
00001890 74 72 61 63 74 69 76 65 20 66 6e 20 64 75 65 20 |tractive fn due |
000018a0 74 6f 20 63 68 61 6e 67 65 20 6f 66 20 63 6f 6f |to change of coo|
000018b0 72 64 69 6e 61 74 65 73 20 74 6f 20 68 61 6e 64 |rdinates to hand|
000018c0 6c 65 20 31 78 32 20 70 69 78 65 6c 20 61 73 70 |le 1x2 pixel asp|
000018d0 65 63 74 20 72 61 74 69 6f 0a 20 20 20 20 20 20 |ect ratio. |
000018e0 20 20 4d 4f 56 4e 45 20 20 20 24 61 2c 20 24 61 | MOVNE $a, $a|
000018f0 2c 20 4c 53 52 20 23 31 20 20 3b 63 68 61 6e 67 |, LSR #1 ;chang|
00001900 65 20 6d 61 64 65 20 33 2f 34 2f 39 34 20 2d 20 |e made 3/4/94 - |
00001910 65 73 74 69 6d 61 74 65 20 6f 76 65 72 68 65 61 |estimate overhea|
00001920 64 20 74 6f 20 72 69 61 20 6f 66 20 75 70 74 6f |d to ria of upto|
00001930 20 33 25 0a 0a 20 20 20 20 20 20 20 20 4d 4f 56 | 3%.. MOV|
00001940 20 20 20 20 20 24 77 2c 20 24 72 2c 20 4c 53 52 | $w, $r, LSR|
00001950 20 23 31 36 0a 20 20 20 20 20 20 20 20 42 49 43 | #16. BIC|
00001960 20 20 20 20 20 24 72 2c 20 24 72 2c 20 24 77 2c | $r, $r, $w,|
00001970 20 4c 53 4c 20 23 31 36 0a 20 20 20 20 20 20 20 | LSL #16. |
00001980 20 4d 55 4c 20 20 20 20 20 24 72 2c 20 24 61 2c | MUL $r, $a,|
00001990 20 24 72 0a 20 20 20 20 20 20 20 20 54 53 54 20 | $r. TST |
000019a0 20 20 20 20 24 72 2c 20 23 31 3c 3c 31 35 20 20 | $r, #1<<15 |
000019b0 20 20 20 20 3b 72 65 6d 65 6d 62 65 72 2c 20 63 | ;remember, c|
000019c0 61 6e 27 74 20 75 73 65 20 6d 6f 76 73 20 72 2c |an't use movs r,|
000019d0 72 2c 6c 73 72 20 23 31 36 2c 20 61 73 20 74 68 |r,lsr #16, as th|
000019e0 69 73 20 77 6f 75 6c 64 20 63 6f 72 72 75 70 74 |is would corrupt|
000019f0 20 56 2c 20 77 68 69 63 68 20 69 73 20 73 74 6f | V, which is sto|
00001a00 72 69 6e 67 20 73 69 67 6e 20 6f 66 20 72 65 73 |ring sign of res|
00001a10 75 6c 74 0a 20 20 20 20 20 20 20 20 4d 4f 56 20 |ult. MOV |
00001a20 20 20 20 20 24 72 2c 20 24 72 2c 20 4c 53 52 20 | $r, $r, LSR |
00001a30 23 31 36 0a 20 20 20 20 20 20 20 20 41 44 44 4e |#16. ADDN|
00001a40 45 20 20 20 24 72 2c 20 24 72 2c 20 23 31 0a 20 |E $r, $r, #1. |
00001a50 20 20 20 20 20 20 20 4d 4c 41 20 20 20 20 20 24 | MLA $|
00001a60 72 2c 20 24 61 2c 20 24 77 2c 20 24 72 0a 0a 20 |r, $a, $w, $r.. |
00001a70 20 20 20 20 20 20 20 52 53 42 56 53 20 20 20 24 | RSBVS $|
00001a80 72 2c 20 24 72 2c 20 23 30 0a 0a 20 20 20 20 20 |r, $r, #0.. |
00001a90 20 20 20 4d 45 4e 44 0a 0a 0a 0a 3b 20 73 71 72 | MEND....; sqr|
00001aa0 74 31 36 0a 3b 20 69 6e 74 65 67 65 72 20 73 71 |t16.; integer sq|
00001ab0 75 61 72 65 20 72 6f 6f 74 20 72 65 74 75 72 6e |uare root return|
00001ac0 69 6e 67 20 31 36 2d 62 69 74 20 66 69 78 65 64 |ing 16-bit fixed|
00001ad0 20 70 6f 69 6e 74 20 6e 75 6d 62 65 72 2c 20 61 | point number, a|
00001ae0 73 73 75 6d 69 6e 67 20 78 20 69 73 20 31 36 2d |ssuming x is 16-|
00001af0 62 69 74 20 66 69 78 65 64 20 70 6f 69 6e 74 0a |bit fixed point.|
00001b00 3b 20 69 65 20 72 65 74 75 72 6e 73 20 73 71 72 |; ie returns sqr|
00001b10 74 28 78 3c 3c 31 36 29 0a 3b 20 49 74 20 74 61 |t(x<<16).; It ta|
00001b20 6b 65 73 20 36 20 70 61 72 61 6d 65 74 65 72 73 |kes 6 parameters|
00001b30 20 2d 20 61 6c 6c 20 72 65 67 69 73 74 65 72 20 | - all register |
00001b40 6e 61 6d 65 73 0a 3b 0a 3b 20 24 78 3a 20 20 20 |names.;.; $x: |
00001b50 78 0a 3b 20 24 72 3a 20 20 20 72 65 73 75 6c 74 |x.; $r: result|
00001b60 20 2d 20 6d 61 79 20 62 65 20 74 68 65 20 73 61 | - may be the sa|
00001b70 6d 65 20 61 73 20 78 0a 3b 20 24 6e 3a 20 20 20 |me as x.; $n: |
00001b80 63 6f 70 79 20 6f 66 20 78 20 75 73 65 64 20 64 |copy of x used d|
00001b90 75 72 69 6e 67 20 63 61 6c 63 75 6c 61 74 69 6f |uring calculatio|
00001ba0 6e 0a 3b 20 24 74 3a 20 20 20 74 72 61 6e 73 69 |n.; $t: transi|
00001bb0 65 6e 74 20 73 63 72 61 74 63 68 0a 3b 20 24 64 |ent scratch.; $d|
00001bc0 3a 20 20 20 72 65 6d 61 69 6e 64 65 72 0a 3b 20 |: remainder.; |
00001bd0 24 6f 3a 20 20 20 63 6f 6e 73 74 61 6e 74 20 76 |$o: constant v|
00001be0 61 6c 75 65 20 6f 66 20 31 0a 3b 0a 20 20 20 20 |alue of 1.;. |
00001bf0 20 20 20 20 4d 41 43 52 4f 0a 24 6c 61 62 65 6c | MACRO.$label|
00001c00 20 20 73 71 72 74 31 36 20 20 24 78 2c 20 24 72 | sqrt16 $x, $r|
00001c10 2c 20 24 6e 2c 20 24 74 2c 20 24 64 2c 20 24 6f |, $n, $t, $d, $o|
00001c20 0a 0a 20 20 20 20 20 20 20 20 41 53 53 45 52 54 |.. ASSERT|
00001c30 20 20 24 78 20 3c 3e 20 24 6e 0a 20 20 20 20 20 | $x <> $n. |
00001c40 20 20 20 41 53 53 45 52 54 20 20 24 78 20 3c 3e | ASSERT $x <>|
00001c50 20 24 74 0a 20 20 20 20 20 20 20 20 41 53 53 45 | $t. ASSE|
00001c60 52 54 20 20 24 78 20 3c 3e 20 24 64 0a 20 20 20 |RT $x <> $d. |
00001c70 20 20 20 20 20 41 53 53 45 52 54 20 20 24 78 20 | ASSERT $x |
00001c80 3c 3e 20 24 6f 0a 20 20 20 20 20 20 20 20 41 53 |<> $o. AS|
00001c90 53 45 52 54 20 20 24 6e 20 3c 3e 20 24 74 0a 20 |SERT $n <> $t. |
00001ca0 20 20 20 20 20 20 20 41 53 53 45 52 54 20 20 24 | ASSERT $|
00001cb0 6e 20 3c 3e 20 24 64 0a 20 20 20 20 20 20 20 20 |n <> $d. |
00001cc0 41 53 53 45 52 54 20 20 24 6e 20 3c 3e 20 24 6f |ASSERT $n <> $o|
00001cd0 0a 20 20 20 20 20 20 20 20 41 53 53 45 52 54 20 |. ASSERT |
00001ce0 20 24 74 20 3c 3e 20 24 64 0a 20 20 20 20 20 20 | $t <> $d. |
00001cf0 20 20 41 53 53 45 52 54 20 20 24 74 20 3c 3e 20 | ASSERT $t <> |
00001d00 24 6f 0a 20 20 20 20 20 20 20 20 41 53 53 45 52 |$o. ASSER|
00001d10 54 20 20 24 64 20 3c 3e 20 24 6f 0a 0a 20 20 20 |T $d <> $o.. |
00001d20 20 20 20 20 20 4c 43 4c 41 20 20 20 20 63 6f 75 | LCLA cou|
00001d30 6e 74 65 72 0a 0a 24 6c 61 62 65 6c 20 20 4d 4f |nter..$label MO|
00001d40 56 20 20 20 20 20 24 6e 2c 20 24 78 0a 20 20 20 |V $n, $x. |
00001d50 20 20 20 20 20 4d 4f 56 20 20 20 20 20 24 6f 2c | MOV $o,|
00001d60 20 23 31 0a 20 20 20 20 20 20 20 20 4d 4f 56 20 | #1. MOV |
00001d70 20 20 20 20 24 78 2c 20 23 30 0a 20 20 20 20 20 | $x, #0. |
00001d80 20 20 20 4d 4f 56 20 20 20 20 20 24 64 2c 20 23 | MOV $d, #|
00001d90 30 0a 0a 20 20 20 20 20 20 20 20 41 4e 44 20 20 |0.. AND |
00001da0 20 20 20 24 74 2c 20 24 6e 2c 20 23 28 33 3c 3c | $t, $n, #(3<<|
00001db0 33 30 29 0a 20 20 20 20 20 20 20 20 4d 4f 56 20 |30). MOV |
00001dc0 20 20 20 20 24 74 2c 20 24 74 2c 20 4c 53 52 20 | $t, $t, LSR |
00001dd0 23 33 30 0a 20 20 20 20 20 20 20 20 4f 52 52 20 |#30. ORR |
00001de0 20 20 20 20 24 64 2c 20 24 64 2c 20 24 74 0a 20 | $d, $d, $t. |
00001df0 20 20 20 20 20 20 20 41 44 44 20 20 20 20 20 24 | ADD $|
00001e00 74 2c 20 24 6f 2c 20 24 78 2c 20 4c 53 4c 20 23 |t, $o, $x, LSL #|
00001e10 31 0a 20 20 20 20 20 20 20 20 43 4d 50 20 20 20 |1. CMP |
00001e20 20 20 24 64 2c 20 24 74 0a 20 20 20 20 20 20 20 | $d, $t. |
00001e30 20 53 55 42 47 45 20 20 20 24 64 2c 20 24 64 2c | SUBGE $d, $d,|
00001e40 20 24 74 0a 20 20 20 20 20 20 20 20 41 44 44 47 | $t. ADDG|
00001e50 45 20 20 20 24 78 2c 20 24 78 2c 20 23 31 0a 0a |E $x, $x, #1..|
00001e60 63 6f 75 6e 74 65 72 20 53 45 54 41 20 20 20 20 |counter SETA |
00001e70 32 38 0a 20 20 20 20 20 20 20 20 57 48 49 4c 45 |28. WHILE|
00001e80 20 20 20 63 6f 75 6e 74 65 72 20 3c 20 33 32 20 | counter < 32 |
00001e90 20 20 20 20 20 20 20 20 20 20 20 20 3b 77 61 6e | ;wan|
00001ea0 74 20 3e 3d 20 30 2c 20 68 6f 77 65 76 65 72 20 |t >= 0, however |
00001eb0 63 6f 75 6e 74 65 72 20 69 73 20 75 6e 73 69 67 |counter is unsig|
00001ec0 6e 65 64 2c 20 73 6f 20 61 66 74 65 72 20 30 20 |ned, so after 0 |
00001ed0 69 74 20 67 6f 65 73 20 68 69 67 68 2c 20 74 68 |it goes high, th|
00001ee0 75 73 20 3c 20 33 32 20 77 69 6c 6c 20 63 61 74 |us < 32 will cat|
00001ef0 63 68 20 69 74 21 0a 20 20 20 20 20 20 20 20 4d |ch it!. M|
00001f00 4f 56 20 20 20 20 20 24 78 2c 20 24 78 2c 20 4c |OV $x, $x, L|
00001f10 53 4c 20 23 31 0a 20 20 20 20 20 20 20 20 4d 4f |SL #1. MO|
00001f20 56 20 20 20 20 20 24 64 2c 20 24 64 2c 20 4c 53 |V $d, $d, LS|
00001f30 4c 20 23 32 0a 20 20 20 20 20 20 20 20 41 4e 44 |L #2. AND|
00001f40 20 20 20 20 20 24 74 2c 20 24 6e 2c 20 23 28 33 | $t, $n, #(3|
00001f50 3c 3c 63 6f 75 6e 74 65 72 29 0a 20 20 20 20 20 |<<counter). |
00001f60 20 20 20 5b 20 20 20 20 20 20 20 63 6f 75 6e 74 | [ count|
00001f70 65 72 20 3c 3e 20 30 0a 20 20 20 20 20 20 20 20 |er <> 0. |
00001f80 4d 4f 56 20 20 20 20 20 24 74 2c 20 24 74 2c 20 |MOV $t, $t, |
00001f90 4c 53 52 20 23 63 6f 75 6e 74 65 72 0a 20 20 20 |LSR #counter. |
00001fa0 20 20 20 20 20 5d 0a 20 20 20 20 20 20 20 20 4f | ]. O|
00001fb0 52 52 20 20 20 20 20 24 64 2c 20 24 64 2c 20 24 |RR $d, $d, $|
00001fc0 74 0a 20 20 20 20 20 20 20 20 41 44 44 20 20 20 |t. ADD |
00001fd0 20 20 24 74 2c 20 24 6f 2c 20 24 78 2c 20 4c 53 | $t, $o, $x, LS|
00001fe0 4c 20 23 31 0a 20 20 20 20 20 20 20 20 43 4d 50 |L #1. CMP|
00001ff0 20 20 20 20 20 24 64 2c 20 24 74 0a 20 20 20 20 | $d, $t. |
00002000 20 20 20 20 53 55 42 47 45 20 20 20 24 64 2c 20 | SUBGE $d, |
00002010 24 64 2c 20 24 74 0a 20 20 20 20 20 20 20 20 41 |$d, $t. A|
00002020 44 44 47 45 20 20 20 24 78 2c 20 24 78 2c 20 23 |DDGE $x, $x, #|
00002030 31 0a 63 6f 75 6e 74 65 72 20 53 45 54 41 20 20 |1.counter SETA |
00002040 20 20 63 6f 75 6e 74 65 72 2d 32 0a 20 20 20 20 | counter-2. |
00002050 20 20 20 20 57 45 4e 44 0a 0a 63 6f 75 6e 74 65 | WEND..counte|
00002060 72 20 53 45 54 41 20 20 20 20 31 34 0a 20 20 20 |r SETA 14. |
00002070 20 20 20 20 20 57 48 49 4c 45 20 20 20 63 6f 75 | WHILE cou|
00002080 6e 74 65 72 20 3c 20 33 32 0a 20 20 20 20 20 20 |nter < 32. |
00002090 20 20 4d 4f 56 20 20 20 20 20 24 78 2c 20 24 78 | MOV $x, $x|
000020a0 2c 20 4c 53 4c 20 23 31 0a 20 20 20 20 20 20 20 |, LSL #1. |
000020b0 20 4d 4f 56 20 20 20 20 20 24 64 2c 20 24 64 2c | MOV $d, $d,|
000020c0 20 4c 53 4c 20 23 32 0a 20 20 20 20 20 20 20 20 | LSL #2. |
000020d0 41 44 44 20 20 20 20 20 24 74 2c 20 24 6f 2c 20 |ADD $t, $o, |
000020e0 24 78 2c 20 4c 53 4c 20 23 31 0a 20 20 20 20 20 |$x, LSL #1. |
000020f0 20 20 20 43 4d 50 20 20 20 20 20 24 64 2c 20 24 | CMP $d, $|
00002100 74 0a 20 20 20 20 20 20 20 20 53 55 42 47 45 20 |t. SUBGE |
00002110 20 20 24 64 2c 20 24 64 2c 20 24 74 0a 20 20 20 | $d, $d, $t. |
00002120 20 20 20 20 20 41 44 44 47 45 20 20 20 24 78 2c | ADDGE $x,|
00002130 20 24 78 2c 20 23 31 0a 63 6f 75 6e 74 65 72 20 | $x, #1.counter |
00002140 53 45 54 41 20 20 20 20 63 6f 75 6e 74 65 72 2d |SETA counter-|
00002150 32 0a 20 20 20 20 20 20 20 20 57 45 4e 44 0a 0a |2. WEND..|
00002160 20 20 20 20 20 20 20 20 5b 20 20 20 20 20 20 20 | [ |
00002170 24 72 20 3c 3e 20 24 78 0a 20 20 20 20 20 20 20 |$r <> $x. |
00002180 20 4d 4f 56 20 20 20 20 20 24 72 2c 20 24 78 0a | MOV $r, $x.|
00002190 20 20 20 20 20 20 20 20 5d 0a 0a 20 20 20 20 20 | ].. |
000021a0 20 20 20 4d 45 4e 44 0a 0a 0a 0a 20 20 20 20 20 | MEND.... |
000021b0 20 20 20 45 4e 44 0a | END.|
000021b7 
.