A2osX/SHARED/X.M32.S.txt
2019-04-10 08:18:51 +01:00

214 lines
3.1 KiB
Plaintext
Raw 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
PREFIX
AUTO 4,1
.LIST OFF
*--------------------------------------
* Uses: 12 ZP
* M32.ACC .BS 4
* M32.ARG .BS 4
* M32.TMP .BS 4
*--------------------------------------
M32.Add ldx #4
ldy #0
clc ARG+ACC->ACC
.1 lda M32.ARG,y
adc M32.ACC,y
sta M32.ACC,y
iny
dex
bne .1
clc
rts if CS, Overflow
*---------------------------------------
M32.Sub ldx #4
ldy #0
sec ARG-ACC->ACC
.1 lda M32.ARG,y
sbc M32.ACC,y
sta M32.ACC,y
iny
dex
bne .1
clc
rts
bcs .8 if CC, Overflow
sec
rts
.8 clc
rts
*--------------------------------------
M32.Mul ldx #3 ARG*ACC->ACC
.1 lda M32.ACC,x
sta M32.TMP,x
stz M32.ACC,x
dex
bpl .1
ldx #32
.2 lsr M32.TMP+3
ror M32.TMP+2
ror M32.TMP+1
ror M32.TMP
bcc .3
clc
lda M32.ARG
adc M32.ACC
sta M32.ACC
lda M32.ARG+1
adc M32.ACC+1
sta M32.ACC+1
lda M32.ARG+2
adc M32.ACC+2
sta M32.ACC+2
lda M32.ARG+3
adc M32.ACC+3
sta M32.ACC+3
.3 asl M32.ARG
rol M32.ARG+1
rol M32.ARG+2
rol M32.ARG+3
dex
bne .2
clc
rts
*--------------------------------------
M32.Mod sec
.HS 90 BCC
*--------------------------------------
M32.Div clc
php
stz M32.TMP ARG/ACC->ACC
stz M32.TMP+1
stz M32.TMP+2
stz M32.TMP+3
ldx #32
.1 asl M32.ARG
rol M32.ARG+1
rol M32.ARG+2
rol M32.ARG+3
rol M32.TMP
rol M32.TMP+1
rol M32.TMP+2
rol M32.TMP+3
sec
lda M32.TMP
sbc M32.ACC
pha
lda M32.TMP+1
sbc M32.ACC+1
pha
lda M32.TMP+2
sbc M32.ACC+2
pha
lda M32.TMP+3
sbc M32.ACC+3
bcs .2
pla
pla
pla
dex
bne .1
bra .3
.2 sta M32.TMP+3
pla
sta M32.TMP+2
pla
sta M32.TMP+1
pla
sta M32.TMP
inc M32.ARG bit0 always 0 because of .1 asl
dex
bne .1
.3 plp
ldx #3
ldy #M32.ARG+3
bcc .4
ldy #M32.TMP+3
clc
.4 lda $0,y
sta M32.ACC,x
dey
dex
bpl .4
rts
*--------------------------------------
M32.ACC2ARG ldx #3 ACC->ARG
.1 lda M32.ACC,x
sta M32.ARG,x
dex
bpl .1
rts
*--------------------------------------
M32.Cmp ldx #4
ldy #0
sec
.1 lda M32.ARG,y
sbc M32.ACC,y
sta M32.ACC,y
iny
dex
bne .1
bcc .5 CC if ACC < ARG
lda M32.ACC
ora M32.ACC+1
ora M32.ACC+2
ora M32.ACC+3 Z if ACC = ARG
bne .4
lda #%010 010 ACC = ARG
rts
.4 lda #%100 100 ACC > ARG
rts
.5 lda #%001 001 ACC < ARG
rts
*--------------------------------------
MAN
SAVE USR/SRC/X.M32.S
LOAD USR/SRC/BIN/SH.S
ASM