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232 lines
8.6 KiB
ObjectPascal
232 lines
8.6 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate PowerPC assembler for type converting nodes
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit nppccnv;
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{$i fpcdefs.inc}
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interface
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uses
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node,ncnv,ncgcnv,ngppccnv;
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type
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tppctypeconvnode = class(tgenppctypeconvnode)
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protected
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{ procedure second_int_to_int;override; }
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{ procedure second_string_to_string;override; }
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{ procedure second_cstring_to_pchar;override; }
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{ procedure second_string_to_chararray;override; }
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{ procedure second_array_to_pointer;override; }
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function first_int_to_real: tnode; override;
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{ procedure second_pointer_to_array;override; }
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{ procedure second_chararray_to_string;override; }
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{ procedure second_char_to_string;override; }
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procedure second_int_to_real;override;
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{ procedure second_real_to_real;override; }
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{ procedure second_cord_to_pointer;override; }
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{ procedure second_proc_to_procvar;override; }
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{ procedure second_bool_to_int;override; }
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{ procedure second_int_to_bool;override; }
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{ procedure second_set_to_set;override; }
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{ procedure second_ansistring_to_pchar;override; }
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{ procedure second_pchar_to_string;override; }
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{ procedure second_class_to_intf;override; }
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{ procedure second_char_to_char;override; }
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end;
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implementation
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uses
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verbose,globtype,globals,systems,
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symconst,symdef,aasmbase,aasmtai,aasmdata,
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defutil,
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cgbase,cgutils,pass_1,pass_2,
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ncon,ncal,
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ncgutil,procinfo,
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cpubase,aasmcpu,
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rgobj,tgobj,cgobj;
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{*****************************************************************************
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FirstTypeConv
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*****************************************************************************}
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function tppctypeconvnode.first_int_to_real: tnode;
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var
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fname: string[19];
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begin
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{ converting a 64bit integer to a float requires a helper }
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if is_64bitint(left.resultdef) or
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is_currency(left.resultdef) then
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begin
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{ hack to avoid double division by 10000, as it's }
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{ already done by typecheckpass.resultdef_int_to_real }
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if is_currency(left.resultdef) then
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left.resultdef := s64inttype;
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if is_signed(left.resultdef) then
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fname := 'fpc_int64_to_double'
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else
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fname := 'fpc_qword_to_double';
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result := ccallnode.createintern(fname,ccallparanode.create(
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left,nil));
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left:=nil;
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firstpass(result);
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exit;
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end
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else
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{ other integers are supposed to be 32 bit }
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begin
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if is_signed(left.resultdef) then
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inserttypeconv(left,s32inttype)
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else
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inserttypeconv(left,u32inttype);
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firstpass(left);
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end;
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result := nil;
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expectloc:=LOC_FPUREGISTER;
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end;
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{*****************************************************************************
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SecondTypeConv
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*****************************************************************************}
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procedure tppctypeconvnode.second_int_to_real;
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type
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tdummyarray = packed array[0..7] of byte;
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const
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dummy1: int64 = $4330000080000000;
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dummy2: int64 = $4330000000000000;
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var
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tempconst: tnode;
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ref: treference;
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valuereg, tempreg, leftreg, tmpfpureg: tregister;
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size: tcgsize;
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signed : boolean;
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begin
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location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
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{ the code here comes from the PowerPC Compiler Writer's Guide }
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{ * longint to double }
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{ addis R0,R0,0x4330 # R0 = 0x43300000 }
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{ stw R0,disp(R1) # store upper half }
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{ xoris R3,R3,0x8000 # flip sign bit }
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{ stw R3,disp+4(R1) # store lower half }
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{ lfd FR1,disp(R1) # float load double of value }
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{ fsub FR1,FR1,FR2 # subtract 0x4330000080000000 }
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{ * cardinal to double }
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{ addis R0,R0,0x4330 # R0 = 0x43300000 }
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{ stw R0,disp(R1) # store upper half }
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{ stw R3,disp+4(R1) # store lower half }
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{ lfd FR1,disp(R1) # float load double of value }
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{ fsub FR1,FR1,FR2 # subtract 0x4330000000000000 }
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tg.Gettemp(current_asmdata.CurrAsmList,8,8,tt_normal,ref);
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signed := is_signed(left.resultdef);
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{ we need a certain constant for the conversion, so create it here }
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if signed then
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tempconst :=
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crealconstnode.create(double(tdummyarray(dummy1)),
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pbestrealtype^)
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else
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tempconst :=
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crealconstnode.create(double(tdummyarray(dummy2)),
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pbestrealtype^);
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typecheckpass(tempconst);
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firstpass(tempconst);
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secondpass(tempconst);
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if (tempconst.location.loc <> LOC_CREFERENCE) or
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{ has to be handled by a helper }
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is_64bitint(left.resultdef) then
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internalerror(200110011);
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if not(left.location.loc in [LOC_REGISTER,LOC_CREGISTER,LOC_REFERENCE,LOC_CREFERENCE]) then
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location_force_reg(current_asmdata.CurrAsmList,left.location,left.location.size,false);
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case left.location.loc of
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LOC_REGISTER:
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begin
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leftreg := left.location.register;
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valuereg := leftreg;
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end;
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LOC_CREGISTER:
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begin
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leftreg := left.location.register;
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if signed then
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valuereg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT)
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else
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valuereg := leftreg;
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end;
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LOC_REFERENCE,LOC_CREFERENCE:
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begin
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leftreg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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valuereg := leftreg;
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if signed then
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size := OS_S32
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else
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size := OS_32;
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cg.a_load_ref_reg(current_asmdata.CurrAsmList,def_cgsize(left.resultdef),
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size,left.location.reference,leftreg);
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end
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else
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internalerror(200110012);
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end;
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tempreg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_const(A_LIS,tempreg,$4330));
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cg.a_load_reg_ref(current_asmdata.CurrAsmList,OS_32,OS_32,tempreg,ref);
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if signed then
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_const(A_XORIS,valuereg,
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{ xoris expects a unsigned 16 bit int (FK) }
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leftreg,$8000));
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inc(ref.offset,4);
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cg.a_load_reg_ref(current_asmdata.CurrAsmList,OS_32,OS_32,valuereg,ref);
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dec(ref.offset,4);
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tmpfpureg := cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
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cg.a_loadfpu_ref_reg(current_asmdata.CurrAsmList,OS_F64,OS_F64,tempconst.location.reference,
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tmpfpureg);
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tempconst.free;
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location.register := cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
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cg.a_loadfpu_ref_reg(current_asmdata.CurrAsmList,OS_F64,OS_F64,ref,location.register);
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tg.ungetiftemp(current_asmdata.CurrAsmList,ref);
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_reg(A_FSUB,location.register,
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location.register,tmpfpureg));
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{ make sure the precision is correct }
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if (tfloatdef(resultdef).floattype = s32real) then
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current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg(A_FRSP,location.register,
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location.register));
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end;
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begin
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ctypeconvnode:=tppctypeconvnode;
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end.
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