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Native.pas
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Native.pas
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{$optimize 7}
{---------------------------------------------------------------}
{ }
{ ORCA Native Code Generation }
{ }
{ This module of the code generator is called to generate }
{ native code instructions. The native code is optimized }
{ and written to the object segment. }
{ }
{ Externally available procedures: }
{ }
{ EndSeg - close out the current segment }
{ GenNative - write a native code instruction to the output }
{ file }
{ GenImplied - short form of GenNative - reduces code size }
{ GenCall - short form of jsl to library subroutine - reduces }
{ code size }
{ GenLab - generate a label }
{ InitFile - Set up the object file }
{ InitNative - set up for a new segment }
{ RefName - handle a reference to a named label }
{ }
{---------------------------------------------------------------}
unit Native;
interface
{$LibPrefix '0/obj/'}
uses CCommon, CGI, CGC, ObjOut;
{$segment 'CODEGEN'}
type
labelptr = ^labelentry; {pointer to a forward ref node}
labelentry = record {forward ref node}
addr: longint;
next: labelptr;
end;
labelrec = record {label record}
defined: boolean; {Note: form used in objout.asm}
chain: labelptr;
case boolean of
true : (val: longint);
false: (ival,hval: integer);
end;
var
{current instruction info}
{------------------------}
pc: longint; {program counter}
{65816 native code generation}
{----------------------------}
didOne: boolean; {has an optimization been done?}
labeltab: array[0..maxlabel] of labelrec; {label table}
localLabel: array[0..maxLocalLabel] of integer; {local variable label table}
{---------------------------------------------------------------}
procedure EndSeg;
{ close out the current segment }
procedure GenNative (p_opcode: integer; p_mode: addressingMode;
p_operand: integer; p_name: stringPtr; p_flags: integer);
{ write a native code instruction to the output file }
{ }
{ parameters: }
{ p_opcode - native op code }
{ p_mode - addressing mode }
{ p_operand - integer operand }
{ p_name - named operand }
{ p_flags - operand modifier flags }
procedure GenImplied (p_opcode: integer);
{ short form of GenNative - reduces code size }
{ }
{ parameters: }
{ p_code - operation code }
procedure GenImpliedForFlags (p_opcode: integer);
{ Generate implied addressing instruction used for flags only. }
{ }
{ parameters: }
{ p_code - operation code (m_tax or m_tay) }
procedure GenCall (callNum: integer);
{ short form of jsl to library subroutine - reduces code size }
{ }
{ parameters: }
{ callNum - subroutine # to generate a call for }
procedure GenLab (lnum: integer);
{ generate a label }
{ }
{ parameters: }
{ lnum - label number }
procedure GenLabUsedOnce (lnum: integer);
{ generate a label that is only targeted by one branch }
{ }
{ parameters: }
{ lnum - label number }
procedure InitFile (keepName: gsosOutStringPtr; keepFlag: integer; partial: boolean);
{ Set up the object file }
{ }
{ parameters: }
{ keepName - name of the output file }
{ keepFlag - keep status: }
{ 0 - don't keep the output }
{ 1 - create a new object module }
{ 2 - a .root already exists }
{ 3 - at least on .letter file exists }
{ partial - is this a partial compile? }
{ }
{ Note: Declared as extern in CGI.pas }
procedure InitNative;
{ set up for a new segment }
procedure LabelSearch (lab: integer; len, shift, disp: integer);
{ resolve a label reference }
{ }
{ parameters: }
{ lab - label number }
{ len - # bytes for the generated code }
{ shift - shift factor }
{ disp - disp past the label }
{ }
{ Note 1: maxlabel is reserved for use as the start of the }
{ string space }
{ Note 2: negative length indicates relative branch }
{ Note 3: zero length indicates 2 byte addr -1 }
procedure RefName (lab: stringPtr; disp, len, shift: integer);
{ handle a reference to a named label }
{ }
{ parameters: }
{ lab - label name }
{ disp - displacement past the label }
{ len - number of bytes in the reference }
{ shift - shift factor }
{--------------------------------------------------------------------------}
implementation
const
npeepSize = 128; {native peephole optimizer window size}
nMaxPeep = 4; {max # instructions needed to opt.}
type
{65816 native code generation}
{----------------------------}
npeepRange = 1..npeepsize; {subrange for native code peephole opt.}
nativeType = record {native code instruction}
opcode: integer; {op code}
mode: addressingMode; {addressing mode}
operand: integer; {operand value}
name: stringPtr; {operand label}
flags: integer; {modifier flags}
end;
registerConditions = (regUnknown,regImmediate,regAbsolute,regLocal);
registerType = record {used to track register contents}
condition: registerConditions;
value: integer;
lab: stringPtr;
flags: integer;
end;
var
{register optimization}
{---------------------}
aRegister, {current register contents}
xRegister,
yRegister: registerType;
lastRegOpcode: integer; {opcode of last reg/flag-setting instr.}
{native peephole optimization}
{----------------------------}
nleadOpcodes: set of 0..max_opcode; {instructions that can start an opt.}
nstopOpcodes: set of 0..max_opcode; {instructions not involved in opt.}
nnextspot: npeepRange; {next empty spot in npeep}
npeep: array[npeepRange] of nativeType; {native peephole array}
{I/O files}
{---------}
fname1, fname2: gsosOutString; {file names}
nextSuffix: char; {next suffix character to use}
procedure GenSymbols (sym: ptr; doGlobals: integer); extern;
{ generate the symbol table }
{--------------------------------------------------------------------------}
procedure LabelSearch {lab: integer; len, shift, disp: integer};
{ resolve a label reference }
{ }
{ parameters: }
{ lab - label number }
{ len - # bytes for the generated code }
{ shift - shift factor }
{ disp - disp past the label }
{ }
{ Note 1: maxlabel is reserved for use as the start of the }
{ string space }
{ Note 2: negative length indicates relative branch }
{ Note 3: zero length indicates 2 byte addr -1 }
var
next: labelptr; {work pointer}
begin {LabelSearch}
if labeltab[lab].defined and (len < 0) and (shift = 0) and (disp = 0) then begin
{handle a relative branch to a known disp}
if len = -1 then
CnOut(labeltab[lab].ival - long(pc).lsw - cbufflen + len)
else
CnOut2(labeltab[lab].ival - long(pc).lsw - cbufflen + len);
end {if}
else begin
if lab <> maxlabel then begin
{handle a normal label reference}
Purge; {empty the constant buffer}
if len < 0 then begin
len := -len; {generate a RELEXPR}
Out(238);
Out(len);
Out2(len); Out2(0);
end {if}
else begin
if isJSL then {generate a standard EXPR}
Out(243)
else
Out(235);
if len = 0 then
Out(2)
else
Out(len);
end; {else}
end; {if}
Out(135); {generate a relative offset from the seg. start}
if not labeltab[lab].defined then begin
next := pointer(Malloc(sizeof(labelEntry))); {value unknown: create a reference}
next^.next := labeltab[lab].chain;
labeltab[lab].chain := next;
next^.addr := blkcnt;
Out2(0);
Out2(0);
end {if}
else {labeltab[lab].defined} begin
Out2(labeltab[lab].ival); {value known: write it}
Out2(labeltab[lab].hval);
end; {else}
if len = 0 then begin
Out(129); {subtract 1 from addr}
Out2(1); Out2(0);
Out(2);
len := 2;
end; {if}
if disp <> 0 then begin
Out(129); {add in the displacement}
Out2(disp);
if disp < 0 then
Out2(-1)
else
Out2(0);
Out(1);
end; {if}
if shift <> 0 then begin
Out(129); {shift the address}
Out2(-shift); if (shift > 0) then Out2(-1) else Out2(0);
Out(7);
end; {if}
if lab <> maxlabel then {if not a string, end the expression}
Out(0);
pc := pc+len; {update the pc}
end; {else}
end; {LabelSearch}
procedure UpDate (lab: integer; labelValue: longint);
{ define a label }
{ }
{ parameters: }
{ lab - label number }
{ labelValue - displacement in seg where label is located }
var
next: labelptr; {work pointer}
begin {UpDate}
if labeltab[lab].defined then
Error(cge1)
else begin
{define the label for future references}
with labeltab[lab] do begin
defined := true;
val := labelValue;
next := chain;
end; {with}
{resolve any forward references}
if next <> nil then begin
Purge;
while next <> nil do begin
segdisp := next^.addr;
Out2(long(labelvalue).lsw);
Out2(long(labelvalue).msw);
blkcnt := blkcnt-4;
next := next^.next;
end; {while}
segdisp := blkcnt;
end; {if}
end; {else}
end; {UpDate}
procedure WriteNative (opcode: integer; mode: addressingMode; operand: integer;
name: stringPtr; flags: integer);
{ write a native code instruction to the output file }
{ }
{ parameters: }
{ opcode - native op code }
{ mode - addressing mode }
{ operand - integer operand }
{ name - named operand }
{ flags - operand modifier flags }
label 1;
type
rkind = (k1,k2,k3,k4,k5); {cnv record types}
var
bp: ^byte; {byte pointer}
ch: char; {temp storage for string constants}
cns: realRec; {for converting reals to bytes}
cnv: record {for converting double, real to bytes}
case rkind of
k1: (rval: real;);
k2: (dval: double;);
k3: (qval: longlong);
k4: (eval: extended);
k5: (ival1,ival2,ival3,ival4,ival5: integer;);
end;
count: integer; {number of constants to repeat}
i,j,k: integer; {loop variables}
lsegDisp: longint; {for backtracking while writing the }
{ debugger's symbol table }
lval: longint; {temp storage for long constant}
nptr: stringPtr; {pointer to a name}
sptr: longstringPtr; {pointer to a string constant}
procedure GenImmediate1;
{ generate a one byte immediate operand }
begin {GenImmediate1}
if (flags & stringReference) <> 0 then begin
Purge;
Out(235); Out(1); {one byte expression}
Out(128); {current location ctr}
Out(129); Out2(-16); Out2(-1); {-16}
Out(7); {bit shift}
Out(0); {end of expr}
pc := pc+1;
end {if}
else if (flags & localLab) <> 0 then
LabelSearch(long(name).lsw, 1, ord((flags & shift16) <> 0)*16, operand)
else if (flags & shift16) <> 0 then
RefName(name, operand, 1, -16)
else
CnOut(operand);
end; {GenImmediate1}
procedure GenImmediate2;
{ generate a two byte immediate operand }
begin {GenImmediate2}
if (flags & stringReference) <> 0 then begin
Purge;
Out(235); Out(2);
LabelSearch(maxLabel, 2, 0, 0);
if operand <> 0 then begin
Out(129);
Out2(operand); if (operand < 0) then Out2(-1) else Out2(0);
Out(1);
end; {if}
if (flags & shift16) <> 0 then begin
Out(129);
Out2(-16); Out2(-1);
Out(7);
end; {if}
Out(0);
end {if}
else if (flags & shift8) <> 0 then
RefName(name, operand, 2, -8)
else if (flags & localLab) <> 0 then
LabelSearch(long(name).lsw, 2, ord((flags & shift16) <> 0)*16, operand)
else if (flags & shift16) <> 0 then
RefName(name, operand, 2, -16)
else if name = nil then
CnOut2(operand)
else
RefName(name, operand, 2, 0);
end; {GenImmediate2}
procedure DefGlobal (private: integer);
{ define a global label }
{ }
{ parameters: }
{ private - private flag }
var
i: integer; {loop variable}
begin {DefGlobal}
Purge;
Out(230); {global label definition}
Out(ord(name^[0])); {write label name}
for i := 1 to ord(name^[0]) do
Out(ord(name^[i]));
Out2(0); {length attribute}
Out(ord('N')); {type attribute: other directive}
Out(private); {private or global?}
end; {DefGlobal}
function ShiftSize (flags: integer): integer;
{ Determine the shift size specified by flags. }
{ (Positive means right shift, negative means left shift.) }
{ }
{ parameters: }
{ flags - the flags }
begin {ShiftSize}
if (flags & shift8) <> 0 then
ShiftSize := 8
else if (flags & shift16) <> 0 then
ShiftSize := 16
else if (flags & shiftLeft8) <> 0 then
ShiftSize := -8
else
ShiftSize := 0;
end; {ShiftSize}
begin {WriteNative}
{ writeln('WriteNative: ',opcode:4, ', mode=', ord(mode):1,
' operand=', operand:1); {debug}
case mode of
implied:
CnOut(opcode);
immediate: begin
if opcode = d_bmov then
GenImmediate1
else begin
if opcode = m_and_imm then
if not longA then
if operand = 255 then
goto 1;
opcode := opcode & ~asmFlag;
CnOut(opcode);
if opcode = m_pea then
GenImmediate2
else if opcode in
[m_adc_imm,m_and_imm,m_cmp_imm,m_eor_imm,m_lda_imm,m_ora_imm,
m_sbc_imm,m_bit_imm] then
if longA then
GenImmediate2
else
GenImmediate1
else if opcode in [m_rep,m_sep,m_cop] then begin
GenImmediate1;
if opcode = m_rep then begin
if (operand & 32) <> 0 then longA := true;
if (operand & 16) <> 0 then longI := true;
end {if}
else if opcode = m_sep then begin
if (operand & 32) <> 0 then longA := false;
if (operand & 16) <> 0 then longI := false;
end; {else}
end {else}
else
if longI then
GenImmediate2
else
GenImmediate1;
end; {else}
end;
longabs: begin
CnOut(opcode);
isJSL := (opcode & ~asmFlag) = m_jsl; {allow for dynamic segs}
if name = nil then
if (flags & toolcall) <> 0 then begin
CnOut2(0);
CnOut(225);
end {if}
else
LabelSearch(operand, 3, 0, 0)
else
if (flags & toolcall) <> 0 then begin
CnOut2(long(name).lsw);
CnOut(long(name).msw);
end {if}
else
RefName(name, operand, 3, 0);
isJSL := false;
end;
longabsolute: begin
if opcode <> d_dcl then begin
CnOut(opcode);
i := 3;
end {if}
else
i := 4;
if (flags & localLab) <> 0 then
LabelSearch(long(name).lsw, i, 0, operand)
else if (flags & constantOpnd) <> 0 then begin
lval := ord4(name);
CnOut2(long(lval).lsw);
if opcode = d_dcl then
CnOut2(long(lval).msw)
else
CnOut(long(lval).msw);
end {else if}
else if name <> nil then
RefName(name, operand, i, 0)
else begin
CnOut2(operand);
CnOut(0);
if opcode = d_dcl then
CnOut(0);
end; {else}
end;
absolute: begin
if opcode <> d_dcw then
CnOut(opcode);
if (flags & localLab) <> 0 then
LabelSearch(long(name).lsw, 2, 0, operand)
else if name <> nil then
RefName(name, operand, 2, 0)
else if (flags & constantOpnd) <> 0 then
CnOut2(operand)
else
LabelSearch(operand, 2, 0, 0);
end;
direct: begin
if opcode <> d_dcb then
CnOut(opcode);
if (flags & localLab) <> 0 then
LabelSearch(long(name).lsw, 1, 0, operand)
else if name <> nil then
RefName(name, operand, 1, 0)
else
CnOut(operand);
end;
longrelative: begin
CnOut(opcode);
LabelSearch(operand, -2, 0, 0);
end;
relative: begin
CnOut(opcode);
LabelSearch(operand, -1, 0, 0);
end;
gnrLabel:
if name = nil then
UpDate(operand, pc+cbufflen)
else begin
DefGlobal((flags >> 5) & 1);
if operand <> 0 then begin
Out(241);
Out2(operand);
Out2(0);
pc := pc+operand;
end; {if}
end; {else}
gnrSpace:
if operand <> 0 then begin
Out(241);
Out2(operand);
Out2(0);
pc := pc+operand;
end; {if}
gnrConstant: begin
if icptr(name)^.optype = cgString then
count := 1
else
count := icptr(name)^.q;
for i := 1 to count do
case icptr(name)^.optype of
cgByte,cgUByte : CnOut(icptr(name)^.r);
cgWord,cgUWord : CnOut2(icptr(name)^.r);
cgLong,cgULong : begin
lval := icptr(name)^.lval;
CnOut2(long(lval).lsw);
CnOut2(long(lval).msw);
end;
cgQuad,cgUQuad : begin
cnv.qval := icptr(name)^.qval;
CnOut2(cnv.ival1);
CnOut2(cnv.ival2);
CnOut2(cnv.ival3);
CnOut2(cnv.ival4);
end;
cgReal : begin
cnv.rval := icptr(name)^.rval;
CnOut2(cnv.ival1);
CnOut2(cnv.ival2);
end;
cgDouble : begin
cnv.dval := icptr(name)^.rval;
CnOut2(cnv.ival1);
CnOut2(cnv.ival2);
CnOut2(cnv.ival3);
CnOut2(cnv.ival4);
end;
cgComp : begin
cns.itsReal := icptr(name)^.rval;
CnvSC(cns);
for j := 1 to 8 do
CnOut(cns.inCOMP[j]);
end;
cgExtended : begin
cnv.eval := icptr(name)^.rval;
CnOut2(cnv.ival1);
CnOut2(cnv.ival2);
CnOut2(cnv.ival3);
CnOut2(cnv.ival4);
CnOut2(cnv.ival5);
end;
cgString : begin
if not icptr(name)^.isByteSeq then begin
sptr := icptr(name)^.str;
for j := 1 to sptr^.length do
CnOut(ord(sPtr^.str[j]));
end {if}
else begin
lval := 0;
while lval < icptr(name)^.len do begin
bp := pointer(
ord4(icptr(name)^.data) + lval);
CnOut(bp^);
lval := lval + 1;
end;
end; {else}
end;
ccPointer : begin
if icptr(name)^.lab <> nil then begin
Purge;
Out(235);
Out(4);
Out(131);
pc := pc+4;
nptr := icptr(name)^.lab;
for j := 0 to ord(nptr^[0]) do
Out(ord(nptr^[j]));
lval := icptr(name)^.pVal;
if lval <> 0 then begin
Out(129);
Out2(long(lval).lsw);
Out2(long(lval).msw);
Out(2-icptr(name)^.r);
end; {if}
Out(0);
end {if}
else begin
lval := icptr(name)^.pVal;
if icptr(name)^.r = 1 then
operand := stringSize+long(lval).lsw
else
operand := stringSize-long(lval).lsw;
flags := stringReference;
GenImmediate2;
flags := stringReference+shift16;
GenImmediate2;
sptr := icptr(name)^.pStr;
j := sptr^.length;
if maxString-stringSize >= j then begin
for k := 1 to j do
stringSpace^[k+stringSize] :=
sptr^.str[k];
stringSize := stringSize+j;
end {if}
else
Error(cge3);
end; {else}
end;
otherwise : Error(cge1);
end; {case}
end;
genAddress: begin
if opcode < 256 then {includes opcodes with asmFlag}
CnOut(opcode);
if (flags & stringReference) <> 0 then begin
Purge;
Out(235);
Out(2);
LabelSearch(maxLabel,2,0,0);
if operand <> 0 then begin
Out(129);
Out2(operand);
Out2(0);
Out(1);
end; {if}
if (flags & shift16) <> 0 then begin
Out(129);
Out2(-16);
Out2(-1);
Out(7);
end; {if}
Out(0);
end {if}
else if operand = 0 then begin
CnOut(0);
CnOut(0);
end {else if}
else if (flags & shift16) <> 0 then
if longA then
LabelSearch(operand, 2, 16, 0)
else
LabelSearch(operand, 1, 16, 0)
else if (flags & subtract1) <> 0 then
LabelSearch(operand, 0, ShiftSize(flags), 0)
else
LabelSearch(operand, 2, 0, 0);
end;
special:
if opcode = d_pin then begin
segDisp := 36;
out2(long(pc).lsw+cBuffLen);
blkCnt := blkCnt-2;
segDisp := blkCnt;
end {if}
else if opcode = d_sym then begin
CnOut(m_cop);
CnOut(5);
Purge;
lsegDisp := segDisp+1;
CnOut2(0);
symLength := 0;
GenSymbols(pointer(name), operand);
segDisp := lSegDisp;
out2(symLength);
blkCnt := blkCnt-2;
segDisp := blkCnt;
end {else if}
else {d_wrd}
CnOut2(operand);
otherwise: Error(cge1);
end; {case}
1:
end; {WriteNative}
procedure CheckRegisters(p_opcode: integer; p_mode: addressingMode;
p_operand: integer; p_name: stringPtr; p_flags: integer);
{ write a native code instruction to the output file }
{ }
{ parameters: }
{ p_opcode - native op code }
{ p_mode - addressing mode }
{ p_operand - integer operand }
{ p_name - named operand }
{ p_flags - operand modifier flags }
label 1,2,3;
function NZMatchA: boolean;
{ Are the N and Z flags known to match the value in A? }
{ }
{ Note: Assumes long registers }
begin {NZMatchA}
NZMatchA := lastRegOpcode in
[m_adc_abs,m_adc_dir,m_adc_imm,m_adc_s,m_adc_indl,m_adc_indly,
m_and_abs,m_and_dir,m_and_imm,m_and_s,m_and_indl,m_and_indly,m_asl_a,
m_dea,m_eor_abs,m_eor_dir,m_eor_imm,m_eor_s,m_eor_indl,m_eor_indly,
m_ina,m_lda_abs,m_lda_absx,m_lda_dir,m_lda_dirx,m_lda_imm,m_lda_indl,
m_lda_indly,m_lda_long,m_lda_longx,m_lda_s,m_lsr_a,m_ora_abs,m_ora_dir,
m_ora_dirX,m_ora_imm,m_ora_long,m_ora_longX,m_ora_s,m_ora_indl,
m_ora_indly,m_pla,m_rol_a,m_ror_a,m_sbc_abs,m_sbc_dir,m_sbc_imm,m_sbc_s,
m_sbc_indl,m_sbc_indly,m_tax,m_tay,m_tcd,m_tdc,m_txa,m_tya];
end; {NZMatchA}
begin {CheckRegisters}
case p_opcode of
m_adc_abs,m_adc_dir,m_adc_imm,m_adc_s,m_and_abs,m_and_dir,m_and_imm,
m_and_s,m_asl_a,m_dea,m_eor_abs,m_eor_dir,m_eor_imm,m_eor_s,m_lda_absx,
m_lda_dirx,m_lda_indl,m_lda_indly,m_lda_longx,m_lda_s,m_lsr_a,m_ora_abs,
m_ora_dir,m_ora_dirX,m_ora_imm,m_ora_long,m_ora_longX,m_ora_s,m_pla,
m_sbc_abs,m_sbc_dir,m_sbc_imm,m_sbc_s,m_tdc,m_tsc,m_adc_indl,m_adc_indly,
m_and_indl,m_and_indly,m_ora_indl,m_ora_indly,m_sbc_indl,m_sbc_indly,
m_eor_indl,m_eor_indly,m_rol_a,m_ror_a:
aRegister.condition := regUnknown;
m_ldy_absX,m_ldy_dirX,m_ply:
yRegister.condition := regUnknown;
m_plx:
xRegister.condition := regUnknown;
m_bcc,m_bcs,m_beq,m_bmi,m_bne,m_bpl,m_bvc,m_bvs,
m_pha,m_phb,m_phd,m_php,m_phx,m_phy,m_pei_dir,m_tcs:
goto 3;
m_bra,m_brl,m_clc,m_cmp_abs,m_cmp_dir,m_cmp_imm,m_cmp_s,m_cmp_indl,
m_cmp_indly,m_cpx_imm,m_jml,m_jmp_indX,m_plb,m_rtl,m_rts,m_sec,d_add,d_pin,
m_cpx_abs,m_cpx_dir,m_cpy_imm,m_cmp_dirx,m_plp,m_cop,d_wrd: ;
m_pea: begin
if aRegister.condition = regImmediate then
if aRegister.value = p_operand then
if aRegister.lab = p_name then
if aRegister.flags = p_flags then
if longA then begin
p_opcode := m_pha;
p_mode := implied;
goto 2;
end; {if}
if longI then begin
if xRegister.condition = regImmediate then
if xRegister.value = p_operand then
if xRegister.lab = p_name then
if xRegister.flags = p_flags then begin
p_opcode := m_phx;
p_mode := implied;
goto 2;
end; {if}
if yRegister.condition = regImmediate then
if yRegister.value = p_operand then
if yRegister.lab = p_name then
if yRegister.flags = p_flags then begin
p_opcode := m_phy;
p_mode := implied;
goto 2;
end; {if}
end; {if}
goto 3;
end;
m_sta_s: begin
if aRegister.condition = regLocal then
aRegister.condition := regUnknown;
if xRegister.condition = regLocal then
xRegister.condition := regUnknown;
if yRegister.condition = regLocal then
yRegister.condition := regUnknown;
goto 3;
end;
m_pld,m_tcd: begin
if aRegister.condition = regLocal then
aRegister.condition := regUnknown;
if xRegister.condition = regLocal then
xRegister.condition := regUnknown;
if yRegister.condition = regLocal then
yRegister.condition := regUnknown;
end;
m_sta_indl,m_sta_indlY: begin
if aRegister.condition <> regImmediate then
aRegister.condition := regUnknown;
if xRegister.condition <> regImmediate then
xRegister.condition := regUnknown;
if yRegister.condition <> regImmediate then
yRegister.condition := regUnknown;
goto 3;
end;
m_sta_absX,m_stz_absX,m_sta_longX: begin
if aRegister.condition = regAbsolute then
if aRegister.lab = p_name then
aRegister.condition := regUnknown;
if xRegister.condition = regAbsolute then
if xRegister.lab = p_name then
xRegister.condition := regUnknown;
if yRegister.condition = regAbsolute then
if yRegister.lab = p_name then
yRegister.condition := regUnknown;
goto 3;
end;
m_dec_abs,m_inc_abs,m_tsb_abs: begin
if aRegister.condition = regAbsolute then
if aRegister.lab = p_name then
if aRegister.value = p_operand then
aRegister.condition := regUnknown;
if xRegister.condition = regAbsolute then
if xRegister.lab = p_name then
if xRegister.value = p_operand then
xRegister.condition := regUnknown;
if yRegister.condition = regAbsolute then
if yRegister.lab = p_name then
if yRegister.value = p_operand then
yRegister.condition := regUnknown;
end;
m_sta_abs,m_stx_abs,m_sty_abs,m_sta_long,m_stz_abs: begin
if aRegister.condition = regAbsolute then
if aRegister.lab = p_name then
if aRegister.value = p_operand then
if not (p_opcode in [m_sta_abs,m_sta_long]) then
aRegister.condition := regUnknown;
if xRegister.condition = regAbsolute then
if xRegister.lab = p_name then
if xRegister.value = p_operand then
if p_opcode <> m_stx_abs then
xRegister.condition := regUnknown;
if yRegister.condition = regAbsolute then
if yRegister.lab = p_name then
if yRegister.value = p_operand then
if p_opcode <> m_sty_abs then
yRegister.condition := regUnknown;
goto 3;
end;
m_dec_dir,m_inc_dir,m_tsb_dir: begin
if aRegister.condition = regLocal then
if aRegister.value = p_operand then
aRegister.condition := regUnknown;
if xRegister.condition = regLocal then
if xRegister.value = p_operand then
xRegister.condition := regUnknown;
if yRegister.condition = regLocal then
if yRegister.value = p_operand then
yRegister.condition := regUnknown;
end;
m_sta_dir,m_stx_dir,m_sty_dir,m_stz_dir: begin
if aRegister.condition = regLocal then
if aRegister.value = p_operand then
if p_opcode <> m_sta_dir then
aRegister.condition := regUnknown;
if xRegister.condition = regLocal then
if xRegister.value = p_operand then
if p_opcode <> m_stx_dir then
xRegister.condition := regUnknown;
if yRegister.condition = regLocal then
if yRegister.value = p_operand then
if p_opcode <> m_sty_dir then