fpc/compiler/cg68kmat.pas
2000-07-13 06:29:38 +00:00

469 lines
20 KiB
ObjectPascal

{
$Id$
Copyright (c) 1998-2000 by Florian Klaempfl
Generate m68k assembler for math nodes
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit cg68kmat;
interface
uses
tree;
procedure secondmoddiv(var p : ptree);
procedure secondshlshr(var p : ptree);
procedure secondunaryminus(var p : ptree);
procedure secondnot(var p : ptree);
implementation
uses
globtype,systems,symconst,
cobjects,verbose,globals,
symtable,aasm,types,
hcodegen,temp_gen,pass_2,
cpubase,cga68k,tgen68k;
{*****************************************************************************
SecondModDiv
*****************************************************************************}
{ D0 and D1 used as temp (ok) }
procedure secondmoddiv(var p : ptree);
var
hreg1 : tregister;
power : longint;
hl : pasmlabel;
reg: tregister;
pushed: boolean;
hl1: pasmlabel;
begin
secondpass(p^.left);
set_location(p^.location,p^.left^.location);
pushed:=maybe_push(p^.right^.registers32,p);
secondpass(p^.right);
if pushed then restore(p);
{ put numerator in register }
if p^.left^.location.loc<>LOC_REGISTER then
begin
if p^.left^.location.loc=LOC_CREGISTER then
begin
hreg1:=getregister32;
emit_reg_reg(A_MOVE,S_L,p^.left^.location.register,hreg1);
end
else
begin
del_reference(p^.left^.location.reference);
hreg1:=getregister32;
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_L,newreference(p^.left^.location.reference),
hreg1)));
end;
clear_location(p^.left^.location);
p^.left^.location.loc:=LOC_REGISTER;
p^.left^.location.register:=hreg1;
end
else hreg1:=p^.left^.location.register;
if (p^.treetype=divn) and (p^.right^.treetype=ordconstn) and
ispowerof2(p^.right^.value,power) then
begin
exprasmlist^.concat(new(paicpu, op_reg(A_TST, S_L, hreg1)));
getlabel(hl);
emitl(A_BPL,hl);
if (power = 1) then
exprasmlist^.concat(new(paicpu, op_const_reg(A_ADDQ, S_L,1, hreg1)))
else
Begin
{ optimize using ADDQ if possible! }
if (p^.right^.value-1) < 9 then
exprasmlist^.concat(new(paicpu, op_const_reg(A_ADDQ, S_L,p^.right^.value-1, hreg1)))
else
exprasmlist^.concat(new(paicpu, op_const_reg(A_ADD, S_L,p^.right^.value-1, hreg1)));
end;
emitl(A_LABEL, hl);
if (power > 0) and (power < 9) then
exprasmlist^.concat(new(paicpu, op_const_reg(A_ASR, S_L,power, hreg1)))
else
begin
exprasmlist^.concat(new(paicpu, op_const_reg(A_MOVE,S_L,power, R_D0)));
exprasmlist^.concat(new(paicpu, op_reg_reg(A_ASR,S_L,R_D0, hreg1)));
end;
end
else
begin
{ bring denominator to D1 }
{ D1 is always free, it's }
{ only used for temporary }
{ purposes }
if (p^.right^.location.loc<>LOC_REGISTER) and
(p^.right^.location.loc<>LOC_CREGISTER) then
begin
del_reference(p^.right^.location.reference);
p^.left^.location.loc:=LOC_REGISTER;
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_L,newreference(p^.right^.location.reference),R_D1)));
end
else
begin
ungetregister32(p^.right^.location.register);
emit_reg_reg(A_MOVE,S_L,p^.right^.location.register,R_D1);
end;
{ on entering this section D1 should contain the divisor }
if (aktoptprocessor = MC68020) then
begin
{ Check if divisor is ZERO - if so call HALT_ERROR }
{ with d0 = 200 (Division by zero!) }
getlabel(hl1);
exprasmlist^.concat(new(paicpu,op_reg(A_TST,S_L,R_D1)));
{ if not zero then simply continue on }
emitl(A_BNE,hl1);
exprasmlist^.concat(new(paicpu,op_const_reg(A_MOVE,S_L,200,R_D0)));
emitcall('FPC_HALT_ERROR',true);
emitl(A_LABEL,hl1);
if (p^.treetype = modn) then
Begin
reg := getregister32;
exprasmlist^.concat(new(paicpu,op_reg(A_CLR,S_L,reg)));
getlabel(hl);
{ here what we do is prepare the high register with the }
{ correct sign. i.e we clear it, check if the low dword reg }
{ which will participate in the division is signed, if so we}
{ we extend the sign to the high doword register by inverting }
{ all the bits. }
exprasmlist^.concat(new(paicpu,op_reg(A_TST,S_L,hreg1)));
emitl(A_BPL,hl);
exprasmlist^.concat(new(paicpu,op_reg(A_NOT,S_L,reg)));
emitl(A_LABEL,hl);
{ reg:hreg1 / d1 }
exprasmlist^.concat(new(paicpu,op_reg_reg_reg(A_DIVSL,S_L,R_D1,reg,hreg1)));
{ hreg1 already contains quotient }
{ looking for remainder }
exprasmlist^.concat(new(paicpu,op_reg_reg(A_MOVE,S_L,reg,hreg1)));
ungetregister32(reg);
end
else
{ simple division... }
Begin
{ reg:hreg1 / d1 }
exprasmlist^.concat(new(paicpu,op_reg_reg(A_DIVS,S_L,R_D1,hreg1)));
end;
end
else { MC68000 operations }
begin
{ put numerator in d0 }
emit_reg_reg(A_MOVE,S_L,hreg1,R_D0);
{ operation to perform on entry to both }
{ routines... d0/d1 }
{ return result in d0 }
if p^.treetype = divn then
emitcall('FPC_LONGDIV',true)
else
emitcall('FPC_LONGMOD',true);
emit_reg_reg(A_MOVE,S_L,R_D0,hreg1);
end; { endif }
end;
{ this registers are always used when div/mod are present }
usedinproc:=usedinproc or ($800 shr word(R_D1));
usedinproc:=usedinproc or ($800 shr word(R_D0));
clear_location(p^.location);
p^.location.loc:=LOC_REGISTER;
p^.location.register:=hreg1;
end;
{*****************************************************************************
SecondShlShr
*****************************************************************************}
{ D6 used as scratch (ok) }
procedure secondshlshr(var p : ptree);
var
hregister1,hregister2,hregister3 : tregister;
op : tasmop;
pushed : boolean;
begin
secondpass(p^.left);
pushed:=maybe_push(p^.right^.registers32,p);
secondpass(p^.right);
if pushed then restore(p);
{ load left operators in a register }
if p^.left^.location.loc<>LOC_REGISTER then
begin
if p^.left^.location.loc=LOC_CREGISTER then
begin
hregister1:=getregister32;
emit_reg_reg(A_MOVE,S_L,p^.left^.location.register,
hregister1);
end
else
begin
del_reference(p^.left^.location.reference);
hregister1:=getregister32;
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_L,newreference(p^.left^.location.reference),
hregister1)));
end;
end
else hregister1:=p^.left^.location.register;
{ determine operator }
if p^.treetype=shln then
op:=A_LSL
else
op:=A_LSR;
{ shifting by a constant directly decode: }
if (p^.right^.treetype=ordconstn) then
begin
if (p^.right^.location.reference.offset and 31 > 0) and (p^.right^.location.reference.offset and 31 < 9) then
exprasmlist^.concat(new(paicpu,op_const_reg(op,S_L,p^.right^.location.reference.offset and 31,
hregister1)))
else
begin
exprasmlist^.concat(new(paicpu,op_const_reg(A_MOVE,S_L,p^.right^.location.reference.offset and 31,
R_D6)));
exprasmlist^.concat(new(paicpu,op_reg_reg(op,S_L,R_D6,hregister1)));
end;
p^.location.loc:=LOC_REGISTER;
p^.location.register:=hregister1;
end
else
begin
{ load right operators in a register }
if p^.right^.location.loc<>LOC_REGISTER then
begin
if p^.right^.location.loc=LOC_CREGISTER then
begin
hregister2:=getregister32;
emit_reg_reg(A_MOVE,S_L,p^.right^.location.register,
hregister2);
end
else
begin
del_reference(p^.right^.location.reference);
hregister2:=getregister32;
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_L,newreference(p^.right^.location.reference),
hregister2)));
end;
end
else hregister2:=p^.right^.location.register;
emit_reg_reg(op,S_L,hregister2,hregister1);
p^.location.register:=hregister1;
end;
{ this register is always used when shl/shr are present }
usedinproc:=usedinproc or ($800 shr byte(R_D6));
end;
{*****************************************************************************
Secondunaryminus
*****************************************************************************}
procedure secondunaryminus(var p : ptree);
begin
secondpass(p^.left);
p^.location.loc:=LOC_REGISTER;
case p^.left^.location.loc of
LOC_REGISTER : begin
p^.location.register:=p^.left^.location.register;
exprasmlist^.concat(new(paicpu,op_reg(A_NEG,S_L,p^.location.register)));
end;
LOC_CREGISTER : begin
p^.location.register:=getregister32;
emit_reg_reg(A_MOVE,S_L,p^.location.register,
p^.location.register);
exprasmlist^.concat(new(paicpu,op_reg(A_NEG,S_L,p^.location.register)));
end;
LOC_REFERENCE,LOC_MEM :
begin
del_reference(p^.left^.location.reference);
{ change sign of a floating point }
{ in the case of emulation, get }
{ a free register, and change sign }
{ manually. }
{ otherwise simply load into an FPU}
{ register. }
if (p^.left^.resulttype^.deftype=floatdef) and
(pfloatdef(p^.left^.resulttype)^.typ<>f32bit) then
begin
{ move to FPU }
floatload(pfloatdef(p^.left^.resulttype)^.typ,
p^.left^.location.reference,p^.location);
if (cs_fp_emulation) in aktmoduleswitches then
{ if in emulation mode change sign manually }
exprasmlist^.concat(new(paicpu,op_const_reg(A_BCHG,S_L,31,
p^.location.fpureg)))
else
exprasmlist^.concat(new(paicpu,op_reg(A_FNEG,S_FX,
p^.location.fpureg)));
end
else
begin
p^.location.register:=getregister32;
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_L,
newreference(p^.left^.location.reference),
p^.location.register)));
exprasmlist^.concat(new(paicpu,op_reg(A_NEG,S_L,p^.location.register)));
end;
end;
LOC_FPU : begin
p^.location.loc:=LOC_FPU;
p^.location.fpureg := p^.left^.location.fpureg;
if (cs_fp_emulation) in aktmoduleswitches then
exprasmlist^.concat(new(paicpu,op_const_reg(A_BCHG,S_L,31,p^.location.fpureg)))
else
exprasmlist^.concat(new(paicpu,op_reg(A_FNEG,S_FX,p^.location.fpureg)));
end;
end;
{ emitoverflowcheck;}
end;
{*****************************************************************************
SecondNot
*****************************************************************************}
procedure secondnot(var p : ptree);
const
flagsinvers : array[F_E..F_BE] of tresflags =
(F_NE,F_E,F_LE,F_GE,F_L,F_G,F_NC,F_C,
F_A,F_AE,F_B,F_BE);
var
hl : pasmlabel;
begin
if (p^.resulttype^.deftype=orddef) and
(porddef(p^.resulttype)^.typ=bool8bit) then
begin
case p^.location.loc of
LOC_JUMP : begin
hl:=truelabel;
truelabel:=falselabel;
falselabel:=hl;
secondpass(p^.left);
maketojumpbool(p^.left);
hl:=truelabel;
truelabel:=falselabel;
falselabel:=hl;
end;
LOC_FLAGS : begin
secondpass(p^.left);
p^.location.resflags:=flagsinvers[p^.left^.location.resflags];
end;
LOC_REGISTER : begin
secondpass(p^.left);
p^.location.register:=p^.left^.location.register;
exprasmlist^.concat(new(paicpu,op_const_reg(A_EOR,S_B,1,p^.location.register)));
end;
LOC_CREGISTER : begin
secondpass(p^.left);
p^.location.loc:=LOC_REGISTER;
p^.location.register:=getregister32;
emit_reg_reg(A_MOVE,S_B,p^.left^.location.register,
p^.location.register);
exprasmlist^.concat(new(paicpu,op_const_reg(A_EOR,S_B,1,p^.location.register)));
end;
LOC_REFERENCE,LOC_MEM : begin
secondpass(p^.left);
del_reference(p^.left^.location.reference);
p^.location.loc:=LOC_REGISTER;
p^.location.register:=getregister32;
if p^.left^.location.loc=LOC_CREGISTER then
emit_reg_reg(A_MOVE,S_B,p^.left^.location.register,
p^.location.register)
else
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_B,
newreference(p^.left^.location.reference),
p^.location.register)));
exprasmlist^.concat(new(paicpu,op_const_reg(A_EOR,S_B,1,p^.location.register)));
end;
end;
end
else
begin
secondpass(p^.left);
p^.location.loc:=LOC_REGISTER;
case p^.left^.location.loc of
LOC_REGISTER : begin
p^.location.register:=p^.left^.location.register;
exprasmlist^.concat(new(paicpu,op_reg(A_NOT,S_L,p^.location.register)));
end;
LOC_CREGISTER : begin
p^.location.register:=getregister32;
emit_reg_reg(A_MOVE,S_L,p^.left^.location.register,
p^.location.register);
exprasmlist^.concat(new(paicpu,op_reg(A_NOT,S_L,p^.location.register)));
end;
LOC_REFERENCE,LOC_MEM :
begin
del_reference(p^.left^.location.reference);
p^.location.register:=getregister32;
exprasmlist^.concat(new(paicpu,op_ref_reg(A_MOVE,S_L,
newreference(p^.left^.location.reference),
p^.location.register)));
exprasmlist^.concat(new(paicpu,op_reg(A_NOT,S_L,p^.location.register)));
end;
end;
{if p^.left^.location.loc=loc_register then
p^.location.register:=p^.left^.location.register
else
begin
del_locref(p^.left^.location);
p^.location.register:=getregister32;
exprasmlist^.concat(new(paicpu,op_loc_reg(A_MOV,S_L,
p^.left^.location,
p^.location.register)));
end;
exprasmlist^.concat(new(paicpu,op_reg(A_NOT,S_L,p^.location.register)));}
end;
end;
end.
{
$Log$
Revision 1.1 2000-07-13 06:29:46 michael
+ Initial import
Revision 1.8 2000/02/09 13:22:49 peter
* log truncated
Revision 1.7 2000/01/07 01:14:22 peter
* updated copyright to 2000
Revision 1.6 1999/11/18 15:34:44 pierre
* Notes/Hints for local syms changed to
Set_varstate function
Revision 1.5 1999/09/16 23:05:51 florian
* m68k compiler is again compilable (only gas writer, no assembler reader)
}