mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-10-31 16:11:33 +01:00
245 lines
8.9 KiB
ObjectPascal
245 lines
8.9 KiB
ObjectPascal
{
|
|
Copyright (c) 1998-2002 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 fpcdefs.inc}
|
|
|
|
interface
|
|
|
|
uses
|
|
node,ncnv,ncgcnv,ngppccnv;
|
|
|
|
type
|
|
tppctypeconvnode = class(tgenppctypeconvnode)
|
|
protected
|
|
{ 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; }
|
|
end;
|
|
|
|
implementation
|
|
|
|
uses
|
|
verbose,globtype,globals,systems,
|
|
symconst,symdef,aasmbase,aasmtai,aasmdata,
|
|
defutil,
|
|
cgbase,cgutils,pass_1,pass_2,
|
|
ncon,ncal,
|
|
ncgutil,procinfo,
|
|
cpubase,aasmcpu,
|
|
rgobj,tgobj,cgobj;
|
|
|
|
|
|
{*****************************************************************************
|
|
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.resultdef) or
|
|
is_currency(left.resultdef) then
|
|
begin
|
|
{ hack to avoid double division by 10000, as it's }
|
|
{ already done by typecheckpass.resultdef_int_to_real }
|
|
if is_currency(left.resultdef) then
|
|
left.resultdef := s64inttype;
|
|
if is_signed(left.resultdef) then
|
|
fname := 'fpc_int64_to_double'
|
|
else
|
|
fname := 'fpc_qword_to_double';
|
|
result := ccallnode.createintern(fname,ccallparanode.create(
|
|
left,nil));
|
|
left:=nil;
|
|
firstpass(result);
|
|
exit;
|
|
end
|
|
else
|
|
{ other integers are supposed to be 32 bit }
|
|
begin
|
|
if is_signed(left.resultdef) then
|
|
inserttypeconv(left,s32inttype)
|
|
else
|
|
inserttypeconv(left,u32inttype);
|
|
firstpass(left);
|
|
end;
|
|
result := nil;
|
|
if registersfpu<1 then
|
|
registersfpu:=1;
|
|
expectloc:=LOC_FPUREGISTER;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
SecondTypeConv
|
|
*****************************************************************************}
|
|
|
|
procedure tppctypeconvnode.second_int_to_real;
|
|
|
|
type
|
|
tdummyarray = packed array[0..7] of byte;
|
|
|
|
const
|
|
dummy1: int64 = $4330000080000000;
|
|
dummy2: int64 = $4330000000000000;
|
|
|
|
var
|
|
tempconst: trealconstnode;
|
|
ref: treference;
|
|
valuereg, tempreg, leftreg, tmpfpureg: tregister;
|
|
size: tcgsize;
|
|
signed : boolean;
|
|
begin
|
|
location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
|
|
|
|
{ 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.Gettemp(current_asmdata.CurrAsmList,8,tt_normal,ref);
|
|
|
|
signed := is_signed(left.resultdef);
|
|
|
|
{ we need a certain constant for the conversion, so create it here }
|
|
if signed then
|
|
tempconst :=
|
|
crealconstnode.create(double(tdummyarray(dummy1)),
|
|
pbestrealtype^)
|
|
else
|
|
tempconst :=
|
|
crealconstnode.create(double(tdummyarray(dummy2)),
|
|
pbestrealtype^);
|
|
|
|
typecheckpass(tempconst);
|
|
firstpass(tempconst);
|
|
secondpass(tempconst);
|
|
if (tempconst.location.loc <> LOC_CREFERENCE) or
|
|
{ has to be handled by a helper }
|
|
is_64bitint(left.resultdef) 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.getintregister(current_asmdata.CurrAsmList,OS_INT)
|
|
else
|
|
valuereg := leftreg;
|
|
end;
|
|
LOC_REFERENCE,LOC_CREFERENCE:
|
|
begin
|
|
leftreg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
|
|
valuereg := leftreg;
|
|
if signed then
|
|
size := OS_S32
|
|
else
|
|
size := OS_32;
|
|
cg.a_load_ref_reg(current_asmdata.CurrAsmList,def_cgsize(left.resultdef),
|
|
size,left.location.reference,leftreg);
|
|
end
|
|
else
|
|
internalerror(200110012);
|
|
end;
|
|
tempreg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
|
|
current_asmdata.CurrAsmList.concat(taicpu.op_reg_const(A_LIS,tempreg,$4330));
|
|
cg.a_load_reg_ref(current_asmdata.CurrAsmList,OS_32,OS_32,tempreg,ref);
|
|
if signed then
|
|
current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_const(A_XORIS,valuereg,
|
|
{ xoris expects a unsigned 16 bit int (FK) }
|
|
leftreg,$8000));
|
|
inc(ref.offset,4);
|
|
cg.a_load_reg_ref(current_asmdata.CurrAsmList,OS_32,OS_32,valuereg,ref);
|
|
dec(ref.offset,4);
|
|
|
|
tmpfpureg := cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
|
|
cg.a_loadfpu_ref_reg(current_asmdata.CurrAsmList,OS_F64,tempconst.location.reference,
|
|
tmpfpureg);
|
|
tempconst.free;
|
|
|
|
location.register := cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
|
|
cg.a_loadfpu_ref_reg(current_asmdata.CurrAsmList,OS_F64,ref,location.register);
|
|
|
|
tg.ungetiftemp(current_asmdata.CurrAsmList,ref);
|
|
|
|
current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_reg(A_FSUB,location.register,
|
|
location.register,tmpfpureg));
|
|
|
|
{ work around bug in some PowerPC processors }
|
|
if (tfloatdef(resultdef).floattype = s32real) then
|
|
current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg(A_FRSP,location.register,
|
|
location.register));
|
|
end;
|
|
|
|
|
|
procedure tppctypeconvnode.second_real_to_real;
|
|
begin
|
|
inherited second_real_to_real;
|
|
{ work around bug in some powerpc processors where doubles aren't }
|
|
{ properly converted to singles }
|
|
if (tfloatdef(left.resultdef).floattype = s64real) and
|
|
(tfloatdef(resultdef).floattype = s32real) then
|
|
current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg(A_FRSP,location.register,
|
|
location.register));
|
|
end;
|
|
|
|
|
|
begin
|
|
ctypeconvnode:=tppctypeconvnode;
|
|
end.
|