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A2osX/SYS/KERNEL.S.MATH32.txt
Rémy GIBERT 80f0627240 Kernel 0.94++
2021-05-09 14:39:40 +02:00

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NEW
AUTO 3,1
*--------------------------------------
M32.AND lda #$32 AND (zp)
.HS 2C BIT ABS
M32.OR lda #$12 ORA (zp)
.HS 2C BIT ABS
M32.XOR lda #$52 EOR (zp)
.HS 2C BIT ABS
M32.ADD lda #$72 ADC (zp)
.HS 2C BIT ABS
M32.SUB lda #$F2 SBC (zp)
sta .2
asl CS if SBC, CC if ADC others = don't care
ldy #4
ldx #4
.1 lda (pStack),y
.2 adc (pStack) SELF MODIFIED
sta (pStack),y
inc pStack
dex
bne .1
rts
*--------------------------------------
M32.SHL sec
.HS 90 BCC
M32.SHR clc
lda (pStack)
inc pStack
inc pStack
inc pStack
inc pStack
tax
beq .8
bcc .3
.1 ldy #0
clc
.2 lda (pStack),y
rol
sta (pStack),y
iny
tya
eor #4
bne .2
dex
bne .1
.8 rts
*--------------------------------------
.3 ldy #3
clc
.4 lda (pStack),y
ror
sta (pStack),y
dey
bpl .4
dex
bne .3
rts
*--------------------------------------
M32.L ldx #0
.HS 2C BIT ABS
M32.LE ldx #1
.HS 2C BIT ABS
M32.G ldx #2
.HS 2C BIT ABS
M32.GE ldx #3
.HS 2C BIT ABS
M32.E ldx #4
.HS 2C BIT ABS
M32.NE ldx #5
*--------------------------------------
M32.CMP lda MATH.CMPT,x
sta .3+1
jsr M32.SUB
tay A = BYTE 3
bmi .1
ldy #2
.10 ora (pStack),y
dey
bpl .10
tay
beq .2
lda #%001
.HS 2C BIT ABS
.1 lda #%100
.HS 2C BIT ABS
.2 lda #%010
.3 and #$ff SELF MODIFIED
bra M32.LOR2
*--------------------------------------
M32.LAND jsr M32.AND
bra M32.LOR1
M32.LOR jsr M32.OR
M32.LOR1 lda (pStack)
ldy #3
.1 ora (pStack),y
dey
bne .1
tay
M32.LOR2 beq .1
lda #1
.1 sta (pStack)
lda #0
ldy #3
.2 sta (pStack),y
dey
bne .2
rts
*--------------------------------------
M32.UMUL clc
.HS B0 BCS
M32.IMUL sec
php
jsr M32.MULDIVMOD
jsr M32.MUL
plp
bcc M32.PutTMP
M32.ITMP lda ACC32.Sign
eor ARG32.Sign
bpl M32.PutTMP
*--------------------------------------
* M32.PutnTMP
*--------------------------------------
lda #TMP32
.HS 2C BIT ABS
*--------------------------------------
M32.PutnARG 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
*--------------------------------------
M32.UDIV clc
.HS B0 BCS
M32.IDIV sec
clv
bra M32.MOD
M32.UMOD clc
.HS B0 BCS
M32.IMOD sec
bit M32.RTS $60
M32.MOD php
jsr M32.MULDIVMOD
jsr M32.DIVMOD
plp
bcc .3 unsigned
bvs M32.ITMP return ITMP
lda ACC32.Sign IDIV
eor ARG32.Sign
bpl M32.PutARG
bra M32.PutnARG
.3 bvc M32.PutARG DIV
*--------------------------------------
M32.PutTMP lda #TMP32 MOD
.HS 2C BIT ABS
*--------------------------------------
M32.PutARG lda #ARG32
sta .1+1
ldy #3
.1 lda $ff,y SELF MODIFIED
sta (pStack),y
dey
bpl .1
rts
*--------------------------------------
M32.PopACC ldy #0
.1 lda (pStack)
inc pStack
sta ACC32,y
iny
cpy #4
bne .1
sta ACC32.Sign
rts
*--------------------------------------
M32.GetARG ldy #0
.1 lda (pStack),y
sta ARG32,y
iny
cpy #4
bne .1
sta ARG32.Sign
M32.RTS rts
*--------------------------------------
M32.MULDIVMOD php
jsr M32.PopACC
jsr M32.GetARG
plp
bcc M32.RTS
jsr .1
*--------------------------------------
* M32.ARG32ABS
*--------------------------------------
lda ARG32.Sign
bmi M32.nARG
rts
*--------------------------------------
* M32.ACC32ABS
*--------------------------------------
.1 lda ACC32.Sign
bpl M32.RTS
*--------------------------------------
M32.nACC ldy #ACC32
.HS 2C BIT ABS
M32.nARG 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
rts
*--------------------------------------
* http://6502.org/source/integers/32muldiv.htm
* http://nparker.llx.com/a2/mult.html
*--------------------------------------
* ARG32*ACC32->TMP32
*--------------------------------------
M32.MUL jsr M32.TMP32Z
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.ACC32x2
dex
bne .1
rts
*--------------------------------------
* ARG32 = ARG32 div ACC32
* TMP32 = ARG32 mod ACC32
*--------------------------------------
M32.DIVMOD jsr M32.TMP32Z
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
*--------------------------------------
*uint32_t lcg_parkmiller(uint32_t *state)
*{
* // Precomputed parameters for Schrage's method
* const uint32_t M = 0x7fffffff;
* const uint32_t A = 48271;
* const uint32_t Q = M / A; // 44488
* const uint32_t R = M % A; // 3399
*
* uint32_t div = *state / Q; // max: M / Q = A = 48,271
* uint32_t rem = *state % Q; // max: Q - 1 = 44,487
*
* int32_t s = rem * A; // max: 44,487 * 48,271 = 2,147,431,977 = 0x7fff3629
* int32_t t = div * R; // max: 48,271 * 3,399 = 164,073,129
* int32_t result = s - t;
*
* if (result < 0)
* result += M;
*
* return *state = result;
*}
*--------------------------------------
* M32.RND TODO
*--------------------------------------
M32.A2ACC32 sta ACC32
.HS 2C BIT ABS
M32.ACC32Z stz ACC32
stz ACC32+1
stz ACC32+2
stz ACC32+3
rts
*--------------------------------------
M32.TMP32Z stz TMP32
stz TMP32+1
stz TMP32+2
stz TMP32+3
rts
*--------------------------------------
MAN
SAVE usr/src/sys/kernel.s.math32
LOAD usr/src/sys/kernel.s
ASM
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