fpc/compiler/powerpc/nppccnv.pas
2002-04-06 18:10:42 +00:00

480 lines
18 KiB
ObjectPascal

{
$Id$
Copyright (c) 1998-2000 by Florian Klaempfl
Generate PowerPC assembler for type converting 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 nppccnv;
{$i defines.inc}
interface
uses
node,ncnv,ncgcnv,types;
type
tppctypeconvnode = class(tcgtypeconvnode)
protected
function first_int_to_int: tnode; override;
procedure second_int_to_int;override;
{ procedure second_string_to_string;override; }
{ procedure second_cstring_to_pchar;override; }
{ procedure second_string_to_chararray;override; }
{ procedure second_array_to_pointer;override; }
function first_int_to_real: tnode; override;
{ procedure second_pointer_to_array;override; }
{ procedure second_chararray_to_string;override; }
{ procedure second_char_to_string;override; }
procedure second_int_to_real;override;
{ procedure second_real_to_real;override; }
{ procedure second_cord_to_pointer;override; }
{ procedure second_proc_to_procvar;override; }
{ procedure second_bool_to_int;override; }
procedure second_int_to_bool;override;
{ procedure second_load_smallset;override; }
{ procedure second_ansistring_to_pchar;override; }
{ procedure second_pchar_to_string;override; }
{ procedure second_class_to_intf;override; }
{ procedure second_char_to_char;override; }
procedure pass_2;override;
procedure second_call_helper(c : tconverttype);
end;
implementation
uses
verbose,globals,systems,
symconst,symdef,aasm,
cgbase,pass_1,pass_2,
ncon,ncal,
cpubase,cpuasm,
rgobj,tgobj,cgobj,cginfo;
{*****************************************************************************
FirstTypeConv
*****************************************************************************}
function tppctypeconvnode.first_int_to_real: tnode;
var
fname: string[19];
begin
{ converting a 64bit integer to a float requires a helper }
if is_64bitint(left.resulttype.def) then
begin
if is_signed(left.resulttype.def) then
fname := 'fpc_int64_to_double'
else
fname := 'fpc_qword_to_double';
result := ccallnode.createintern(fname,ccallparanode.create(
left,nil));
firstpass(result);
exit;
end
else
{ other integers are supposed to be 32 bit }
begin
if is_signed(left.resulttype.def) then
inserttypeconv(left,s32bittype)
else
inserttypeconv(left,u32bittype);
firstpass(left);
end;
result := inherited first_int_to_real;
end;
{*****************************************************************************
SecondTypeConv
*****************************************************************************}
procedure tppctypeconvnode.second_int_to_int;
var
fromsize,
tosize : longint;
opsize,
tempsize : tcgsize;
begin
{ insert range check if not explicit conversion }
if not(nf_explizit in flags) then
cg.g_rangecheck(exprasmlist,left,resulttype.def);
fromsize := left.resulttype.def.size;
tosize := resulttype.def.size;
{ is the result size smaller ? }
if tosize < fromsize then
begin
opsize := def_cgsize(resulttype.def);
case left.location.loc of
LOC_REGISTER,LOC_CREGISTER:
begin
if location.loc = LOC_REGISTER then
location.register:= left.location.register
else
location.register := rg.getregisterint(exprasmlist);
case opsize of
OS_8:
exprasmlist.concat(taicpu.op_reg_reg_const_const_const(
A_RLWINM,location.register,left.location.register,
0,24,31));
OS_S8:
exprasmlist.concat(taicpu.op_reg_reg(A_EXTSB,
location.register,left.location.register));
OS_16:
exprasmlist.concat(taicpu.op_reg_reg_const_const_const(
A_RLWINM,location.register,left.location.register,
0,16,31));
OS_S16:
exprasmlist.concat(taicpu.op_reg_reg(A_EXTSH,
location.register,left.location.register));
else
begin
if location.register <> left.location.register then
exprasmlist.concat(taicpu.op_reg_reg(A_MR,
location.register,left.location.register));
{ we can release the upper register }
if opsize in [OS_64,OS_S64] then
rg.ungetregister(exprasmlist,left.location.registerhigh);
end;
end;
end;
LOC_REFERENCE,LOC_CREFERENCE:
begin
set_location(location,left.location);
inc(location.reference.offset,fromsize-tosize);
end;
end;
end
{ is the result size bigger ? }
else if resulttype.def.size>left.resulttype.def.size then
begin
opsize := int_cgsize(fromsize);
location.loc := LOC_REGISTER;
case left.location.loc of
LOC_REFERENCE,LOC_CREFERENCE:
begin
reference_release(exprasmlist,left.location.reference);
location.register := rg.getregisterint(exprasmlist);
if not (opsize in [OS_64,OS_S64]) then
tempsize := pred(opsize)
else
tempsize := opsize;
{ this one takes care of the necessary sign extensions }
cg.a_load_ref_reg(exprasmlist,tempsize,
left.location.reference,location.register);
tg.ungetiftemp(exprasmlist,left.location.reference);
end;
LOC_CREGISTER:
{ since we only have 32bit registers and everything is }
{ always loaded with sign-extending or zeroeing }
{ instructions as appropriate, the source will contain }
{ the correct value already, so simply copy it }
begin
location.register := rg.getregisterint(exprasmlist);
exprasmlist.concat(taicpu.op_reg_reg(A_MR,location.register,
left.location.register));
end;
{ see LOC_CREGISTER }
LOC_REGISTER:;
end;
{ sign extend even further if necessary }
if opsize in [OS_64,OS_S64] then
begin
location.registerhigh := rg.getregisterint(exprasmlist);
if (opsize = OS_64) or
not (is_signed(left.resulttype.def)) then
cg.a_load_const_reg(exprasmlist,OS_32,0,
location.registerhigh)
else
{ duplicate the sign bit 32 times in the high reg }
exprasmlist.concat(taicpu.op_reg_reg_const(A_SRAWI,
location.registerhigh,location.register,31));
end;
end
else
set_location(location,left.location);
end;
procedure tppctypeconvnode.second_int_to_real;
type
dummyrec = record
i: int64;
end;
var
tempconst: trealconstnode;
ref: treference;
valuereg, tempreg, leftreg, tmpfpureg: tregister;
signed: boolean;
begin
{ the code here comes from the PowerPC Compiler Writer's Guide }
{ * longint to double }
{ addis R0,R0,0x4330 # R0 = 0x43300000 }
{ stw R0,disp(R1) # store upper half }
{ xoris R3,R3,0x8000 # flip sign bit }
{ stw R3,disp+4(R1) # store lower half }
{ lfd FR1,disp(R1) # float load double of value }
{ fsub FR1,FR1,FR2 # subtract 0x4330000080000000 }
{ * cardinal to double }
{ addis R0,R0,0x4330 # R0 = 0x43300000 }
{ stw R0,disp(R1) # store upper half }
{ stw R3,disp+4(R1) # store lower half }
{ lfd FR1,disp(R1) # float load double of value }
{ fsub FR1,FR1,FR2 # subtract 0x4330000000000000 }
tg.gettempofsizereference(exprasmlist,8,ref);
signed := is_signed(left.resulttype.def);
{ we need a certain constant for the conversion, so create it here }
if signed then
tempconst :=
{ we need this strange typecast because we want the }
{ double represented by $4330000080000000, not the }
{ double converted from the integer with that value }
crealconstnode.create(double(dummyrec($4330000080000000)),
pbestrealtype^)
else
tempconst :=
crealconstnode.create(double(dummyrec($4330000000000000)),
pbestrealtype^);
resulttypepass(tempconst);
firstpass(tempconst);
secondpass(tempconst);
if (tempconst.location.loc <> LOC_CREFERENCE) or
{ has to be handled by a helper }
is_64bitint(left.resulttype.def) then
internalerror(200110011);
case left.location.loc of
LOC_REGISTER:
begin
leftreg := left.location.register;
valuereg := leftreg;
end;
LOC_CREGISTER:
begin
leftreg := left.location.register;
if signed then
valuereg := cg.get_scratch_reg(exprasmlist)
else
valuereg := leftreg;
end;
LOC_REFERENCE,LOC_CREFERENCE:
begin
leftreg := cg.get_scratch_reg(exprasmlist);
valuereg := leftreg;
cg.a_load_ref_reg(exprasmlist,def_cgsize(left.resulttype.def),
left.location.reference,leftreg);
end
else
internalerror(200110012);
end;
tempreg := cg.get_scratch_reg(exprasmlist);
exprasmlist.concat(taicpu.op_reg_const(A_LIS,tempreg,$4330));
cg.a_load_reg_ref(exprasmlist,OS_32,tempreg,ref);
if signed then
exprasmlist.concat(taicpu.op_reg_reg_const(A_XORIS,valuereg,
leftreg,$8000));
inc(ref.offset,4);
cg.a_load_reg_ref(exprasmlist,OS_32,valuereg,ref);
if (left.location.loc = LOC_REGISTER) or
((left.location.loc = LOC_CREGISTER) and
not signed) then
rg.ungetregister(exprasmlist,leftreg)
else
cg.free_scratch_reg(exprasmlist,valuereg);
tmpfpureg := rg.getregisterfpu(exprasmlist);
exprasmlist.concat(taicpu.op_reg_ref(A_LFD,tmpfpureg,
newreference(tempconst.location.reference)));
tempconst.free;
location.register := rg.getregisterfpu(exprasmlist);
exprasmlist.concat(taicpu.op_reg_ref(A_LFD,location.register,
newreference(ref)));
{ restore original offset before ungeting the tempref }
dec(ref.offset,4);
tg.ungetiftemp(exprasmlist,ref);
exprasmlist.concat(taicpu.op_reg_reg_reg(A_FSUB,location.register,
location.register,tmpfpureg));
rg.ungetregisterfpu(exprasmlist,tmpfpureg);
end;
procedure tppctypeconvnode.second_int_to_bool;
var
hreg1,
hreg2 : tregister;
resflags : tresflags;
opsize : tcgsize;
begin
clear_location(location);
{ byte(boolean) or word(wordbool) or longint(longbool) must }
{ be accepted for var parameters }
if (nf_explizit in flags) and
(left.resulttype.def.size=resulttype.def.size) and
(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER]) then
begin
set_location(location,left.location);
exit;
end;
location.loc:=LOC_REGISTER;
opsize := def_cgsize(left.resulttype.def);
case left.location.loc of
LOC_CREFERENCE,LOC_REFERENCE,LOC_REGISTER,LOC_CREGISTER :
begin
if left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE] then
begin
reference_release(exprasmlist,left.location.reference);
hreg2:=rg.getregisterint(exprasmlist);
cg.a_load_ref_reg(exprasmlist,opsize,
left.location.reference,hreg2);
end
else
hreg2 := left.location.register;
hreg1 := rg.getregisterint(exprasmlist);
exprasmlist.concat(taicpu.op_reg_reg_const(A_SUBIC,hreg1,
hreg2,1));
exprasmlist.concat(taicpu.op_reg_reg_reg(A_SUBFE,hreg1,hreg1,
hreg2));
rg.ungetregister(exprasmlist,hreg2);
end;
LOC_FLAGS :
begin
hreg1:=rg.getregisterint(exprasmlist);
resflags:=left.location.resflags;
cg.g_flags2reg(exprasmlist,resflags,hreg1);
end;
else
internalerror(10062);
end;
location.register := hreg1;
end;
procedure tppctypeconvnode.second_call_helper(c : tconverttype);
const
secondconvert : array[tconverttype] of pointer = (
@second_nothing, {equal}
@second_nothing, {not_possible}
@second_nothing, {second_string_to_string, handled in resulttype pass }
@second_char_to_string,
@second_nothing, {char_to_charray}
@second_nothing, { pchar_to_string, handled in resulttype pass }
@second_nothing, {cchar_to_pchar}
@second_cstring_to_pchar,
@second_ansistring_to_pchar,
@second_string_to_chararray,
@second_nothing, { chararray_to_string, handled in resulttype pass }
@second_array_to_pointer,
@second_pointer_to_array,
@second_int_to_int,
@second_int_to_bool,
@second_bool_to_int, { bool_to_bool }
@second_bool_to_int,
@second_real_to_real,
@second_int_to_real,
@second_proc_to_procvar,
@second_nothing, { arrayconstructor_to_set }
@second_nothing, { second_load_smallset, handled in first pass }
@second_cord_to_pointer,
@second_nothing, { interface 2 string }
@second_nothing, { interface 2 guid }
@second_class_to_intf,
@second_char_to_char,
@second_nothing, { normal_2_smallset }
@second_nothing { dynarray_2_openarray }
);
type
tprocedureofobject = procedure of object;
var
r : packed record
proc : pointer;
obj : pointer;
end;
begin
{ this is a little bit dirty but it works }
{ and should be quite portable too }
r.proc:=secondconvert[c];
r.obj:=self;
tprocedureofobject(r){$ifdef FPC}();{$endif FPC}
end;
procedure tppctypeconvnode.pass_2;
{$ifdef TESTOBJEXT2}
var
r : preference;
nillabel : plabel;
{$endif TESTOBJEXT2}
begin
{ this isn't good coding, I think tc_bool_2_int, shouldn't be }
{ type conversion (FK) }
if not(convtype in [tc_bool_2_int,tc_bool_2_bool]) then
begin
secondpass(left);
set_location(location,left.location);
if codegenerror then
exit;
end;
second_call_helper(convtype);
end;
begin
ctypeconvnode:=tppctypeconvnode;
end.
{
$Log$
Revision 1.5 2002-04-06 18:13:02 jonas
* several powerpc-related additions and fixes
Revision 1.4 2001/12/29 15:28:58 jonas
* powerpc/cgcpu.pas compiles :)
* several powerpc-related fixes
* cpuasm unit is now based on common tainst unit
+ nppcmat unit for powerpc (almost complete)
Revision 1.3 2001/10/28 14:17:10 jonas
+ second_int_to_real for cardinal, int64 and qword
Revision 1.2 2001/10/01 12:17:26 jonas
+ implemented second_int_to_real
* fixed small bug in second_int_to_int
Revision 1.1 2001/09/29 21:33:12 jonas
+ implemented in_to_bool and int_to_int (+ helper in nppcutil)
}