{ 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_set_to_set;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; 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); if not(left.location.loc in [LOC_REGISTER,LOC_CREGISTER,LOC_REFERENCE,LOC_CREFERENCE]) then location_force_reg(current_asmdata.CurrAsmList,left.location,left.location.size,false); 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,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,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)); { make sure the precision is correct } if (tfloatdef(resultdef).floattype = s32real) then current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg(A_FRSP,location.register, location.register)); end; begin ctypeconvnode:=tppctypeconvnode; end.