Apple-2-SW/A2osX
1
0
Fork 0
mirror of https://github.com/A2osX/A2osX.git synced 2024-06-07 17:29:34 +00:00
Code Issues Projects Releases Wiki Activity
0.93
A2osX/SYS/KERNEL.S.MATH.txt
Rémy GIBERT 39fbf75056 Kernel 0.93++
2020-01-18 20:37:32 +01:00

491 lines
8.4 KiB
Plaintext
Raw Permalink Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

NEW
AUTO 3,1
*--------------------------------------
GP.ADD32 clc
.HS B0 BCS
GP.SUB32 sec
php
jsr GP.PopACC32
ldy #0
ldx #3
plp
bcs .1
lda #$79 ADC Absolute,Y
.HS 2C BIT ABS
.1 lda #$F9 SBC Absolute,Y
sta .3
.2 lda (pStack),y
.3 adc ACC32,y SELF MODIFIED
sta (pStack),y
iny
dex
bpl .2
GP.SUB32.RTS rts
*--------------------------------------
* Returns:
* ff X < Y
* 0 X = Y
* 1 X > Y
*--------------------------------------
GP.UCMP32
GP.ICMP32 jsr GP.SUB32
jsr GP.PopACC32 A = ACC32+3 (sign)
tay
bmi .2
.1 ora ACC32+2
ora ACC32+1
ora ACC32
beq .8
lda #1
rts
.2 lda #$ff
.8 rts
*--------------------------------------
GP.UMUL32 clc
.HS B0 BCS
GP.IMUL32 sec
php
jsr GP.MULDIVMOD.COMMON
jsr MATH.MUL32
plp
bcc GP.SUB32.RTS
GP.RETURN.ITMP
lda ACC32.Sign
eor ARG32.Sign
bpl GP.PutTMP32
bra GP.PutNotTMP32
*--------------------------------------
GP.UDIV32 clc
.HS B0 BCS
GP.IDIV32 sec
clv
bra GP.DIVMOD
GP.UMOD32 clc
.HS B0 BCS
GP.IMOD32 sec
bit GP.SUB32.RTS $60
GP.DIVMOD php
jsr GP.MULDIVMOD.COMMON
jsr MATH.DIVMOD32
plp
bcc .3 unsigned
bvs GP.RETURN.ITMP IMOD
lda ACC32.Sign IDIV
eor ARG32.Sign
bpl GP.PutARG32
bra GP.PutNotARG32
.3 bvs GP.PutARG32 DIV
*--------------------------------------
GP.PutTMP32 lda #TMP32 MOD
.HS 2C BIT ABS
*--------------------------------------
GP.PutARG32 lda #ARG32
sta .1+1
ldy #3
.1 lda $ff,y SELF MODIFIED
sta (pStack),y
dey
bpl .1
rts
*--------------------------------------
GP.PutNotTMP32 lda #TMP32
.HS 2C BIT ABS
*--------------------------------------
GP.PutNotARG32 lda #ARG32
sta .1+1
ldy #0
ldx #3
sec
.1 lda $ff,y SELF MODIFIED
eor #$ff two's complement of X bytes
adc #0
sta (pStack),y
iny
dex
bpl .1
rts
*--------------------------------------
GP.PopACC32 ldy #0
.1 lda (pStack)
inc pStack
sta ACC32,y
iny
cpy #4
bne .1
sta ACC32.Sign
rts
*--------------------------------------
GP.GetARG32 ldy #0
.1 lda (pStack),y
sta ARG32,y
iny
cpy #4
bne .1
sta ARG32.Sign
GP.GetARG32.RTS rts
*--------------------------------------
GP.MULDIVMOD.COMMON
php
jsr GP.PopACC32
jsr GP.GetARG32
plp
bcc GP.GetARG32.RTS
jsr MATH.ACC32ABS
jmp MATH.ARG32ABS
*--------------------------------------
* http://6502.org/source/integers/32muldiv.htm
* http://nparker.llx.com/a2/mult.html
*--------------------------------------
* ARG32*ACC32->TMP32
*--------------------------------------
MATH.MUL32 jsr MATH.TMP32ZERO
ldx #32
.1 lsr ARG32+3
ror ARG32+2
ror ARG32+1
ror ARG32
bcc .3
clc
ldy #0
.2 lda TMP32,y
adc ACC32,y
sta TMP32,y
iny
tya
eor #4
bne .2
.3 jsr MATH.ACC32.T2
dex
bne .1
clc
rts
*--------------------------------------
* ARG32 = ARG32 div ACC32
* TMP32 = ARG32 mod ACC32
*--------------------------------------
MATH.DIVMOD32 jsr MATH.TMP32ZERO
ldx #32
.1 asl ARG32
rol ARG32+1
rol ARG32+2
rol ARG32+3
rol TMP32
rol TMP32+1
rol TMP32+2
rol TMP32+3
sec
lda TMP32
sbc ACC32
pha
lda TMP32+1
sbc ACC32+1
pha
lda TMP32+2
sbc ACC32+2
pha
lda TMP32+3
sbc ACC32+3
bcs .2
pla
pla
pla
dex
bne .1
rts
.2 sta TMP32+3
pla
sta TMP32+2
pla
sta TMP32+1
pla
sta TMP32
inc ARG32 bit0 always 0 because of .1 asl
dex
bne .1
rts
*--------------------------------------
MATH.A2STR10NP ldx #3 3 digit max
ldy #0 Disable Padding
MATH.A2STR10 jsr MATH.A2ACC32
clc unsigned
*--------------------------------------
* CS = signed long
* CC = unsigned long
* X = Pad Len
* Y = Pad Char
*--------------------------------------
MATH.ACC322STR10
stx .5+1 Pad Len
sty .81+1 Pad Char
stz A2osX.NumStrLen
bcc .1
clc
lda ACC32+3
bpl .1
jsr MATH.ACC32NEG
sec
.1 ror ACC32.Sign Save sign
ldx #4
.2 stz RESULT,x Clear all 5 bytes
dex
bpl .2
sed switch to BCD mode
ldx #32 let's roll 32 bits
.3 jsr MATH.ACC32.T2
ldy #4
.4 lda RESULT,y
adc RESULT,y
sta RESULT,y
dey
bpl .4
dex
bne .3
cld
ldx .5+1 no padding
beq .6
lda #10 starts at 10-padlen
sec
.5 sbc #$ff SELF MODIFIED
tax
.6 txa
lsr
tay
lda RESULT,y
bcs .7
lsr
lsr
lsr
lsr
.7 and #$0F
ora #$30
cmp #'0'
beq .80
ldy #'0' next 0s always printed
sty .81+1
bra .82
.80 cpx #9 last char, print always
beq .82
.81 lda #$ff SELF MODIFIED Get Padding char
beq .87
.82 bit ACC32.Sign "-" to print ?
bpl .86
pha
lda #'-'
jsr .88
stz ACC32.Sign
pla
.86 jsr .88
.87 inx
cpx #10
bne .6
lda #0
.88 ldy A2osX.NumStrLen
inc A2osX.NumStrLen
sta A2osX.NumStrBuf,y
rts
*--------------------------------------
* Convert Hex int at ZPPtr2 to ACC32
*--------------------------------------
MATH.Hex2ACC32 lda (ZPPtr2)
beq .9
jsr SHARED.IsHexDigit
bcs .9
jsr MATH.A2ACC32
ldy #0
.1 iny
lda (ZPPtr2),y
beq .8
jsr SHARED.IsHexDigit
bcs .8
pha
ldx #4
.2 jsr MATH.ACC32.T2
dex
bne .2
pla
ora ACC32
sta ACC32
bra .1
.8 clc
rts
.9 sec
rts
*--------------------------------------
* Convert A to 2 hex digits in AX
*--------------------------------------
MATH.AToHexAX pha
and #$0F
jsr .8
tax
pla
lsr
lsr
lsr
lsr
.8 ora #$30
cmp #'9'+1
bcc .9
adc #6
.9 rts
*--------------------------------------
* Convert Decimal int at ZPPtr2 to ACC32
*--------------------------------------
MATH.Dec2ACC32 jsr MATH.ACC32ZERO
clc
lda (ZPPtr2)
eor #'-'
bne .10
jsr SHARED.NextCharPtr2 skip '-'
sec
.10 ror .80+1 set pos/neg flag
ldy #$ff
.1 iny
lda (ZPPtr2),y
beq .8
jsr ZP.IsDigit
bcs .8
phy Save Y, pointing to next char
jsr MATH.ACC32.T10
ply
bcs .9
lda (ZPPtr2),y
and #$0F
* clc
adc ACC32
sta ACC32
bcc .1
inc ACC32+1
bne .1
inc ACC32+2
bne .1
inc ACC32+3
bne .1 if 0, overflow!!!
.9 lda #E.INUM
sec
rts
.8 tya no digit parsed...error
beq .9
.80 lda #$FF SELF MODIFIED
bpl .88
phy
jsr MATH.ACC32NEG
ply
.88 clc
rts
*--------------------------------------
MATH.ACC32.T10 ldx #3
.1 lda ACC32,x save ACC32 for 4+1
pha
dex
bpl .1
jsr MATH.ACC32.T2 ACC32 * 2 -> ACC32
jsr MATH.ACC32.T2 ACC32 * 4 -> ACC32
ldx #0
ldy #4
* clc
.2 pla ACC32 * 4 + ACC32 -> ACC32
adc ACC32,x
sta ACC32,x
inx
dey
bne .2
MATH.ACC32.T2 asl ACC32
rol ACC32+1
rol ACC32+2
rol ACC32+3
rts
*--------------------------------------
MATH.A2ACC32 sta ACC32
.HS 2C BIT ABS
MATH.ACC32ZERO stz ACC32
stz ACC32+1
stz ACC32+2
stz ACC32+3
rts
*--------------------------------------
MATH.TMP32ZERO stz TMP32
stz TMP32+1
stz TMP32+2
stz TMP32+3
rts
*--------------------------------------
MATH.ARG32ABS lda ARG32.Sign
bmi MATH.ARG32NEG
rts
*--------------------------------------
MATH.ACC32ABS lda ACC32.Sign
bpl MATH.ACC32NEG.RTS
*--------------------------------------
MATH.ACC32NEG ldy #ACC32
.HS 2C BIT ABS
MATH.ARG32NEG ldy #ARG32
ldx #3
sec
.1 lda $0,y two's complement of X bytes
eor #$ff
adc #0
sta $0,y
iny
dex
bpl .1
MATH.ACC32NEG.RTS
rts
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.MATH
LOAD USR/SRC/SYS/KERNEL.S
ASM
Reference in New Issue View Git Blame Copy Permalink