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;..............................................................................
;
; StyleWare Macros`
;
; Macros...: AddWord, AddLong, SubWord, SubLong
; Author...: Mike Hibbetts, (2.0 conversion Scott Lindsey)
; Date.....: June 30, 1987 ... Oct 22,1988
; Version..: 2.0
;
; The following is a short description of the available addressing
; modes that may be used with the math macros in m16.math.
;
; Notes: 'a', 'x', and 'y' denote the 65816 registers.
; 's' denotes that an operand is to be either pulled or pushed.
;
; For programmer based optimization, it should be noted that all zero
; page indirect indexing is done out of the 'y' register, and all other
; indexing is done out of the 'x' register. So, for example,
;
; AddLong Addr:#4,[zp]:#4,>Long
; is better coded as
; ldy #4
; AddLong Addr:y,[zp]:y,>Long,
; (it saves on 1 'ldx')
; and
;
; SubLong Addr1:#offset1,>Long:#offset2,Addr3
; is better coded as
; ldy #offset2
; SubLong Addr1:#offset1,>Long:y,Addr3.
; (it saves on 3 'ldx' and costs 1 'ldy')
;
; All other optimizations have been done internally to the macros.
;.............................................................................
;
; Where
;
; P = { Addr, Addr:#offset, Addr:offset, Addr:x, Addr:y,
; [zp], [zp]:#offset, [zp]:offset, [zp]:y, zp:s
; Long, Long:#offset, Long:offset, Long:x, s },
;
; Q = { a, x, y, #const } + P,
;
; R = { #const } + P, and
;
; T = { a, x, y } + P,
;
; all
;
; AddWord Q,R,T
; AddLong Q,R,P
; SubWord Q,R,T
; SubLong Q,R,P
;
; are allowed.
;
;-----------------------------------------------------------------------------
MACRO
&lab AddWord &term1,&term2,&dest
&lab ;
Arith 2,adc,clc,&term1,&term2,&dest
MEND
MACRO
&lab Addw &term1,&term2,&dest
&lab
AddWord &term1,&term2,&dest
MEND
;----------------------------------------------------------------------------
MACRO
&lab AddLong &term1,&term2,&dest
&lab ;
Arith 4,adc,clc,&term1,&term2,&dest
MEND
MACRO
&lab AddL &term1,&term2,&dest
&lab
AddLong &term1,&term2,&dest
MEND
;----------------------------------------------------------------------------
MACRO
&lab SubWord &term1,&term2,&dest
&lab ;
Arith 2,sbc,sec,&term1,&term2,&dest
MEND
MACRO
&lab Subw &term1,&term2,&dest
&lab
SubWord &term1,&term2,&dest
MEND
;----------------------------------------------------------------------------
MACRO
&lab SubLong &term1,&term2,&dest
&lab ;
Arith 4,sbc,sec,&term1,&term2,&dest
MEND
MACRO
&lab Subl &term1,&term2,&dest
&lab
SubLong &term1,&term2,&dest
MEND
;----------------------------------------------------------------------------
MACRO
Arith &length,&op1,&op2,&term1,&term2,&dest
gbla &same
gbla &Yinc
gblc &lastX
gblc &lastY
gbla &OFFinc
gblc &pushed
&same SETA 0
&OFFinc SETA 0
&Yinc SETA 0
&pushed SETC ''
&lastX SETC ''
&lastY SETC ''
lcla &colon
lcla &stack1
lcla &pull1
lcla &pull2
lcla &zp1
lcla &zp2
lcla &zp3
lclc &addr1
lclc &off1
lclc &addr2
lclc &off2
lclc &addr3
lclc &off3
lclc &badreg
&badreg SETC 'y'
lclc &jump1
lclc &jump2
lclc &jump3
IF &substr(&term1,1,1)<29>'[' GOTO .doterm12
&zp1 seta 1
.doterm12
&colon seta &pos(':',&term1)
IF &colon=0 GOTO .no1offset
&off1 SETC &substr(&term1,&colon+1,&len(&term1)-&colon)
&addr1 SETC &substr(&term1,1,&colon-1)
GOTO .doterm21
.no1offset
&addr1 SETC &term1
.doterm21
IF &substr(&term2,1,1)<29>'[' GOTO .doterm22
&zp2 seta 1
.doterm22
&colon seta &pos(':',&term2)
IF &colon=0 GOTO .no2offset
&off2 SETC &substr(&term2,&colon+1,&len(&term2)-&colon)
&addr2 SETC &substr(&term2,1,&colon-1)
GOTO .dodest1
.no2offset
&addr2 SETC &term2
.dodest1
IF &substr(&dest,1,1)<29>'[' GOTO .dodest2
&zp3 seta 1
&badreg SETC 'x'
.dodest2
&colon seta &pos(':',&dest)
IF &colon=0 GOTO .no3offset
&off3 SETC &substr(&dest,&colon+1,&len(&dest)-&colon)
&addr3 SETC &substr(&dest,1,&colon-1)
IF &off3<66>'y' GOTO .start
&badreg SETC 'x'
GOTO .start
.no3offset
&addr3 SETC &dest
IF &addr3<72>'y' GOTO .start
&badreg SETC 'x'
.start
IF &zp1 GOTO .loadzp1
IF &len(&off1) GOTO .withoff11
IF &addr1='a' GOTO .loadR1
IF &addr1='x' GOTO .loadx1
IF &addr1='y' GOTO .loady1
IF &addr1='s' GOTO .loads1
.; Changed 5/16/89 <09><>MSL
IF (&substr(&addr1,1,1) = '#') THEN
lda #<&substr(&addr1,2,&len(&addr1)-1)
ELSE
lda &addr1
ENDIF
.;
&jump1 SETC '.load2'
GOTO .loaded1
; -----------------
.loadx1
txa
GOTO .loadR1
.loady1
tya
.loadR1
&jump1 SETC '.loadR2'
GOTO .loaded1
; -----------------
.loads1
IF &off2='s' GOTO .loads12
IF &off3='s' GOTO .loads12
IF &length='2' GOTO .loads11
&stack1 seta 1
.loads11
pla
&jump1 SETC '.loads2'
GOTO .loaded1
; -----------------
.loads12
lda 1,s
&jump1 SETC '.loads22'
&pull1 seta 1
GOTO .loaded1
; -----------------
.loadzp1
IF &len(&off1) GOTO .loadzpo1
lda &addr1
&jump1 SETC '.loadzp2'
GOTO .loaded1
; -----------------
.loadzpo1
IF &off1='y' GOTO .loadzpy1
&jump1 SETC '.loadzpo2'
IF (&off2<66>'y') and (&off3<66>'y') GOTO .loadzpo12
phy
&pushed SETC 'y'
&jump1 SETC '.loadzpo22'
.loadzpo12
ldy &off1
lda &addr1,y
&lastY SETC &off1
GOTO .loaded1
; ------------------
.loadzpy1
lda &addr1,&off1
&jump1 SETC '.loadzpy2'
GOTO .loaded1
; ------------------
.withoff11
IF &off1='x' GOTO .loffx1
IF &off1='y' GOTO .loffy1
IF &off1='s' GOTO .loffs1
&jump1 SETC '.loadoff2'
IF (&off2<66>'x') and (&off3<66>'x') GOTO .withoff112
phx
&pushed SETC 'x'
&jump1 SETC '.loadoff22'
.withoff112
ldx &off1
lda &addr1,x
&lastX SETC &off1
GOTO .loaded1
; -----------------
.loffx1
lda &addr1,x
&jump1 SETC '.loffx2'
GOTO .loaded1
; -------------------
.loffy1
lda &addr1,y
&jump1 SETC '.loffy2'
GOTO .loaded1
; -------------------
.loffs1
lda &addr1,s
&jump1 SETC '.loffs2'
.loaded1
&op2
IF &zp2 GOTO .addzp1
IF &len(&off2) GOTO .withoff12
IF &addr2='s' GOTO .adds11
IF &substr(&addr2,1,1)='#' THEN
&op1 #<&substr(&addr2,2,&len(&addr2)-1)
ELSE
&op1 &addr2
ENDIF
&jump2 SETC '.add2'
GOTO .added1
; -----------------
.adds11
STreset
&pull2 seta 1
IF &pull1 GOTO .adds12
IF &stack1 GOTO .adds13
&op1 1,s
&jump2 SETC '.adds21'
GOTO .added1
; -----------------
.adds12
&op1 1+&length,s
&jump2 SETC '.adds22'
GOTO .added1
; -----------------
.adds13
&op1 3,s
&jump2 SETC '.adds21'
GOTO .added1
; -----------------
.addzp1
IF &len(&off2) GOTO .addzpo1
&op1 &addr2
&jump2 SETC '.addzp2'
GOTO .added1
; -----------------
.addzpo1
IF &off2='y' GOTO .addzpy1
IF &len(&pushed) GOTO .addzpo12
IF &off3='y' GOTO .addzpo11
IF (&off1<66>'y') or (&length='2') GOTO .addzpo12
.addzpo11
phy
&pushed SETC 'y'
.addzpo12
DoLoad 1,y,&off2
&op1 &addr2,y
&jump2 SETC '.addzpo2'
GOTO .added1
; ------------------
.addzpy1
IF &pushed<65>'y' GOTO .loadzpy12
ply
&pushed SETC ''
&lastY SETC ''
.loadzpy12
&op1 &addr2,&off2
&jump2 SETC '.addzpy2'
GOTO .added1
; ------------------
.withoff12
IF &off2='x' GOTO .aoffx1
IF &off2='y' GOTO .aoffy1
IF &off2='s' GOTO .aoffs1
IF &len(&pushed) GOTO .withoff122
IF &off3='x' GOTO .withoff121
IF (&off1<66>'x') or (&length='2') GOTO .withoff122
.withoff121
phx
&pushed SETC 'x'
.withoff122
DoLoad 1,x,&off2
&op1 &addr2,x
&jump2 SETC '.addoff2'
GOTO .added1
; -----------------
.aoffx1
IF &pushed<65>'x' GOTO .aoffx12
plx
&pushed SETC ''
&lastX SETC ''
.aoffx12
&op1 &addr2,x
&jump2 SETC '.aoffx2'
GOTO .added1
; -------------------
.aoffy1
IF &pushed<65>'y' GOTO .aoffy12
ply
&pushed SETC ''
&lastY SETC ''
.aoffy12
&op1 &addr2,y
&jump2 SETC '.aoffy2'
GOTO .added1
; -------------------
.aoffs1
STreset
&op1 &addr2,s
&jump2 SETC '.aoffs2'
.added1
IF &zp3 GOTO .storezp1
IF &len(&off3) GOTO .withoff13
IF &addr3='a' GOTO .storeR1
IF &addr3='x' GOTO .storex1
IF &addr3='y' GOTO .storey1
IF &addr3='s' GOTO .stores1
sta &addr3
&jump3 SETC '.store2'
GOTO .stored1
; ------------------
.storex1
tax
GOTO .storeR1
.storey1
tay
.storeR1
&jump3 SETC '.error1'
GOTO .stored1
; ------------------
.stores1
STreset
IF &pull1 or &pull2 GOTO .stores12
IF &stack1 GOTO .stores13
IF &length='2' GOTO .stores111
pha
.stores111
pha
&jump3 SETC '.stores2'
GOTO .stored1
; -----------------
.stores12
IF &stack1 GOTO .stores14
sta 1,s
&jump3 SETC '.stores2'
&pull1 seta 0
&pull2 seta 0
GOTO .stored1
; -----------------
.stores13
pha
&jump1 SETC '.loads22'
&jump3 SETC '.stores2'
GOTO .stored1
; -----------------
.stores14
sta 3,s
&jump3 SETC '.stores2'
&pull1 seta 0
&pull2 seta 0
GOTO .stored1
; ------------------
.storezp1
IF &len(&off3) GOTO .storezpo1
sta &addr3
&jump3 SETC '.storezp2'
GOTO .stored1
; -----------------
.storezpo1
IF &off3='y' GOTO .storezpy1
IF &len(&pushed) or (&length='2') GOTO .storezpo12
IF (&off1<66>'y') and (&off2<66>'y') GOTO .storezpo12
phy
&pushed SETC 'y'
.storezpo12
DOLoad 1,y,&off3
sta &addr3,y
&jump3 SETC '.storezpo2'
GOTO .stored1
; ------------------
.storezpy1
IF &pushed<65>'y' GOTO .storezpy12
ply
&pushed SETC ''
&lastY SETC ''
.storezpy12
sta &addr3,&off3
&jump3 SETC '.storezpy2'
GOTO .stored1
; ------------------
.withoff13
IF &off3='x' GOTO .soffx1
IF &off3='y' GOTO .soffy1
IF &off3='s' GOTO .soffs1
IF &len(&pushed) or (&length='2') GOTO .withoff132
IF (&off1<66>'x') and (&off2<66>'x') GOTO .withoff132
phx
&pushed SETC 'x'
.withoff132
DoLoad 1,x,&off3
sta &addr3,x
&jump3 SETC '.storeoff2'
GOTO .stored1
; -----------------
.soffx1
IF &pushed<65>'x' GOTO .soffx12
plx
&pushed SETC ''
&lastX SETC ''
.soffx12
sta &addr3,x
&jump3 SETC '.soffx2'
GOTO .stored1
; -------------------
.soffy1
IF &pushed<65>'y' GOTO .soffy12
ply
&pushed SETC ''
&lastY SETC ''
.soffy12
sta &addr3,y
&jump3 SETC '.soffy2'
GOTO .stored1
; -------------------
.soffs1
STreset
sta &addr3,s
&jump3 SETC '.soffs2'
.stored1
IF &length='2' GOTO .stored2
GOTO &jump1
;--------------------------------------------------------------
.load2
HighByte lda,&addr1
GOTO .loaded2
; -----------------
.loadR2
lda #0
GOTO .loaded2
; -----------------
.loads2
STreset
pla
GOTO .loaded2
; -----------------
.loads22
STreset
lda 3,s
GOTO .loaded2
; -----------------
.loadzp2
IF &len(&pushed) GOTO .loadzp22
IF (&off2<66>'y') and (&off3<66>'y') GOTO .loadzp22
phy
&pushed SETC 'y'
.loadzp22
DoLoad 1,y,#2
lda &addr1,y
GOTO .loaded2
; -----------------
.loadzpo22
IF &len(&pushed) GOTO .loadzpo2
phy
&pushed SETC 'y'
.loadzpo2
DoLoad 2,y,&off1
lda &addr1,y
GOTO .loaded2
; ------------------
.loadzpy2
IF &pushed<65>'y' GOTO .loadzpy21
ply
&pushed SETC ''
&lastY SETC ''
.loadzpy21
doY
lda &addr1,&off1
GOTO .loaded2
; ------------------
.loadoff22
IF &len(&pushed) GOTO .loadoff2
phx
&pushed SETC 'x'
.loadoff2
DoLoad 1,x,&off1
lda &addr1+2,x
GOTO .loaded2
; -----------------
.loffx2
IF &pushed<65>'x' GOTO .loffx21
plx
&pushed SETC ''
&lastX SETC ''
.loffx21
lda &addr1+2,x
GOTO .loaded2
; -------------------
.loffy2
IF &pushed<65>'y' GOTO .loffy21
ply
&pushed SETC ''
&lastY SETC ''
.loffy21
IF &Yinc GOTO .loffy22
lda &addr1+2,y
GOTO .loaded2
; -------------------
.loffy22
lda &addr1,y
GOTO .loaded2
; -------------------
.loffs2
STreset
lda &addr1+2,s
.loaded2
GOTO &jump2
;------------------------------
;------------------------------
.add2
HighByte &op1,&addr2
GOTO .added2
; -----------------
.adds21
STreset
&op1 3,s
GOTO .added2
; -----------------
.adds22
&op1 3+&length,s
GOTO .added2
; -----------------
.addzp2
IF &len(&pushed) or (&off3<66>'y') GOTO .addzp22
phy
&pushed SETC 'y'
.addzp22
DoLoad 1,y,#2
&op1 &addr2,y
GOTO .added2
; -----------------
.addzpo2
IF &len(&pushed) or (&off3<66>'y') GOTO .addzpo22
phy
&pushed SETC 'y'
.addzpo22
DoLoad 2,y,&off2
&op1 &addr2,y
GOTO .added2
; ------------------
.addzpy2
IF &pushed<65>'y' GOTO .addzpy22
ply
&pushed SETC ''
&lastY SETC ''
.addzpy22
doY
&op1 &addr2,&off2
GOTO .added2
; ------------------
.addoff2
IF &len(&pushed) or (&off3<66>'x') GOTO .addoff22
phx
&pushed SETC 'x'
.addoff22
DoLoad 1,x,&off2
&op1 &addr2+2,x
GOTO .added2
; -----------------
.aoffx2
IF &pushed<65>'x' GOTO .aoffx22
plx
&pushed SETC ''
&lastX SETC ''
.aoffx22
&op1 &addr2+2,x
GOTO .added2
; -------------------
.aoffy2
IF &pushed<65>'y' GOTO .aoffy22
ply
&pushed SETC ''
&lastY SETC ''
.aoffy22
IF &Yinc GOTO .aoffy23
&op1 &addr2+2,y
GOTO .added2
; -------------------
.aoffy23
&op1 &addr2,y
GOTO .added2
; -------------------
.aoffs2
STreset
&op1 &addr2+2,s
.added2
GOTO &jump3
;------------------------------
;------------------------------
.error1
MNOTE 'Register cannot hold long integer.',4
GOTO .stored2
; ------------------
.store2
HighByte sta,&addr3
GOTO .stored2
; ------------------
.stores2
STreset
sta 3,s
GOTO .stored2
; -----------------
.storezp2
DoLoad 1,y,#2
sta &addr3,y
GOTO .stored2
; -----------------
.storezpo2
DoLoad 2,y,&off3
sta &addr3,y
GOTO .stored2
; ------------------
.storezpy2
IF &pushed<65>'y' GOTO .storezpy22
ply
&pushed SETC ''
&lastY SETC ''
.storezpy22
doY
sta &addr3,&off3
GOTO .stored2
; ------------------
.storeoff2
DoLoad 1,x,&off3
sta &addr3+2,x
GOTO .stored2
; -----------------
.soffx2
IF &pushed<65>'x' GOTO .soffx22
plx
&pushed SETC ''
&lastX SETC ''
.soffx22
sta &addr3+2,x
GOTO .stored2
; -------------------
.soffy2
IF &pushed<65>'y' GOTO .soffy22
ply
&pushed SETC ''
&lastY SETC ''
.soffy22
IF &Yinc GOTO .soffy23
sta &addr3+2,y
GOTO .stored2
; -------------------
.soffy23
sta &addr3,y
GOTO .stored2
; -------------------
.soffs2
STreset
sta &addr3+2,s
.stored2
IF &pull1=0 GOTO .stored210
IF &length='2' GOTO .stored205
pl&badreg
.stored205
pl&badreg
.stored210
IF &pull2=0 GOTO .stored220
IF &length='2' GOTO .stored215
pl&badreg
.stored215
pl&badreg
.stored220
MEND
;------------------------------------------------------------------------------
MACRO
HighByte &oper,&loc
lclc &c
lclc &rest
IF &substr(&loc,1,1)='#' GOTO .b
&oper &loc+2
MEXIT
.b
&rest SETC &substr(&loc,2,&len(&loc)-1)
&oper #^&rest
MEND
;--------------------------------------------------------
MACRO
DoLoad &half,&reg,&value
gbla &same
gbla &OFFinc
IF &half='1' GOTO .c
IF &substr(&value,1,1)='#' GOTO .a
Check &reg,&value
IF &same GOTO .e
ld&reg &value
in&reg
in&reg
&OFFinc seta 1
MEXIT
.e
IF &OFFinc GOTO .done
in&reg
in&reg
&OFFinc seta 1
MEXIT
.a
Check &reg,&value+2
IF &same GOTO .done
ld&reg &value+2
&OFFinc seta 1
MEXIT
.c
Check &reg,&value
IF &same GOTO .done
ld&reg &value
.done
MEND
;-----------------------------------------------------
MACRO
doY
GBLA &Yinc
IF &Yinc GOTO .done
&Yinc seta 1
iny
iny
.done
MEND
;-------------------------------------------------
MACRO
STreset
GBLC &pushed
GBLC &lastX
IF &len(&pushed)=0 GOTO .done
IF &pushed='y' GOTO .d
plx
&pushed SETC ''
&lastX SETC ''
MEXIT
.d
ply
&pushed SETC ''
&lastY SETC ''
.done
MEND
;-------------------------------------------------
MACRO
Check &reg,&string
gbla &same
gblc &lastX
gblc &lastY
lcla &search
IF &reg='y' GOTO .regy
IF &len(&lastx)<29>&len(&string) GOTO .nomatchx
&search seta &pos(&string,&lastx)
IF &search=0 GOTO .nomatchx
GOTO .match
.regy
IF &len(&lastY)<29>&len(&string) GOTO .nomatchy
&search seta &pos(&string,&lasty)
IF &search=0 GOTO .nomatchy
.match
&same seta 1
MEXIT
.nomatchx
&same seta 0
&lastX SETC &string
MEXIT
.nomatchy
&same seta 0
&lastY SETC &string
MEND
;------------------------------------------------------
;...............................................................
;
; Addwl - add word quickly to long word in place
;...............................................................
MACRO
&lab addwl &a1,&a2
&lab ;
IF (&a1='a' or &a1='A') GOTO .a
lda &a1
.a
clc
adc &a2
sta &a2
bcc ~b&sysindex
inc &a2+2
~b&sysindex ;
mend
;...............................................................
;
; Subwl - sub word quickly to long word in place
;...............................................................
MACRO
&lab subwl &a1,&a2
&lab ;
IF (&a1='a' or &a1='A') GOTO .a
lda &a2
.a
sec
sbc &a1
sta &a2
bcs ~b&sysindex
dec &a2+2
~b&sysindex ;
mend
;------------------------------------------------------
MACRO
&label Addwls &arg1,&arg2
&label AddWord &arg1,&arg2,a
ldx &arg2+2
bcc ~b&sysindex
inx
~b&sysindex
phx
pha
MEND
;------------------------------------------------------
MACRO
Mul2 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
asl &op
MEND
;-----------------------
MACRO
Mul4 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
asl &op
asl &op
MEND
;-----------------------
MACRO
Mul8 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
asl &op
asl &op
asl &op
MEND
;-----------------------
MACRO
Mul16 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
asl &op
asl &op
asl &op
asl &op
MEND
;-----------------------
MACRO
Mul32 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
asl &op
asl &op
asl &op
asl &op
asl &op
MEND
;-----------------------
MACRO
Div2 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
lsr &op
MEND
;-----------------------
MACRO
Div4 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
lsr &op
lsr &op
MEND
;-----------------------
MACRO
Div8 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
lsr &op
lsr &op
lsr &op
MEND
;-----------------------
MACRO
Div16 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
lsr &op
lsr &op
lsr &op
lsr &op
MEND
;-----------------------
MACRO
Div32 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
lsr &op
lsr &op
lsr &op
lsr &op
lsr &op
MEND
;-----------------------
MACRO
Inc4 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
inc &op
inc &op
inc &op
inc &op
MEND
;-----------------------
MACRO
Dec4 &param
lclc &op
if &nbr(&syslist)=0 then
&op setc 'a'
else
&op setc &param
endif
dec &op
dec &op
dec &op
dec &op
MEND
;-----------------------
MACRO
&lab sdiv4 &op
moveword &op,a
bmi ~b&sysindex
lsr a
lsr a
bra ~c&sysindex
~b&sysindex
sec
ror a
sec
ror a
~c&sysindex
moveword a,&op
MEND
;------------------------------------------------------
;------------------------------------------------------
; XOR - renaming for eor
;------------------------------------------------------
MACRO
&lab xor &op
&lab
eor &op
MEND
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