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345 lines
13 KiB
ObjectPascal
345 lines
13 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,defcmp;
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type
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tppctypeconvnode = class(tcgtypeconvnode)
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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_load_smallset;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,
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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,
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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.resulttype.def) or
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is_currency(left.resulttype.def) 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 resulttypepass.resulttype_int_to_real }
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if is_currency(left.resulttype.def) then
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left.resulttype := s64inttype;
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if is_signed(left.resulttype.def) 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.resulttype.def) 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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if registersfpu<1 then
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registersfpu:=1;
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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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{$ifdef VER1_0}
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var
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dummy1, dummy2: int64;
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{$else VER1_0}
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const
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dummy1: int64 = $4330000080000000;
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dummy2: int64 = $4330000000000000;
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{$endif VER1_0}
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var
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tempconst: trealconstnode;
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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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{$ifdef VER1_0}
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dummy1 := (int64(1) shl 31) or (int64($43300000) shl 32);
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dummy2 := int64($43300000) shl 32;
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{$endif VER1_0}
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location_reset(location,LOC_FPUREGISTER,def_cgsize(resulttype.def));
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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(exprasmlist,8,tt_normal,ref);
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signed := is_signed(left.resulttype.def);
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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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resulttypepass(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.resulttype.def) then
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internalerror(200110011);
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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(exprasmlist,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(exprasmlist,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(exprasmlist,def_cgsize(left.resulttype.def),
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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(exprasmlist,OS_INT);
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exprasmlist.concat(taicpu.op_reg_const(A_LIS,tempreg,$4330));
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cg.a_load_reg_ref(exprasmlist,OS_32,OS_32,tempreg,ref);
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if signed then
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exprasmlist.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(exprasmlist,OS_32,OS_32,valuereg,ref);
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dec(ref.offset,4);
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tmpfpureg := cg.getfpuregister(exprasmlist,OS_F64);
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cg.a_loadfpu_ref_reg(exprasmlist,OS_F64,tempconst.location.reference,
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tmpfpureg);
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tempconst.free;
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location.register := cg.getfpuregister(exprasmlist,OS_F64);
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cg.a_loadfpu_ref_reg(exprasmlist,OS_F64,ref,location.register);
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tg.ungetiftemp(exprasmlist,ref);
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exprasmlist.concat(taicpu.op_reg_reg_reg(A_FSUB,location.register,
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location.register,tmpfpureg));
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{ work around bug in some PowerPC processors }
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if (tfloatdef(resulttype.def).typ = s32real) then
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exprasmlist.concat(taicpu.op_reg_reg(A_FRSP,location.register,
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location.register));
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end;
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procedure tppctypeconvnode.second_real_to_real;
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begin
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inherited second_real_to_real;
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{ work around bug in some powerpc processors where doubles aren't }
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{ properly converted to singles }
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if (tfloatdef(left.resulttype.def).typ = s64real) and
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(tfloatdef(resulttype.def).typ = s32real) then
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exprasmlist.concat(taicpu.op_reg_reg(A_FRSP,location.register,
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location.register));
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end;
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procedure tppctypeconvnode.second_int_to_bool;
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var
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hreg1,
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hreg2 : tregister;
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href : treference;
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resflags : tresflags;
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opsize : tcgsize;
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hlabel, oldtruelabel, oldfalselabel : tasmlabel;
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begin
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oldtruelabel:=truelabel;
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oldfalselabel:=falselabel;
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objectlibrary.getlabel(truelabel);
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objectlibrary.getlabel(falselabel);
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secondpass(left);
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if codegenerror then
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exit;
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{ byte(boolean) or word(wordbool) or longint(longbool) must }
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{ be accepted for var parameters }
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if (nf_explicit in flags) and
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(left.resulttype.def.size=resulttype.def.size) and
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(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER]) then
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begin
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truelabel:=oldtruelabel;
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falselabel:=oldfalselabel;
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location_copy(location,left.location);
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exit;
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end;
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location_reset(location,LOC_REGISTER,def_cgsize(resulttype.def));
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opsize := def_cgsize(left.resulttype.def);
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case left.location.loc of
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LOC_CREFERENCE,LOC_REFERENCE,LOC_REGISTER,LOC_CREGISTER :
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begin
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if left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE] then
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begin
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hreg1:=cg.getintregister(exprasmlist,OS_INT);
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if left.location.size in [OS_64,OS_S64] then
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begin
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cg.a_load_ref_reg(exprasmlist,OS_INT,OS_INT,left.location.reference,hreg1);
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hreg2:=cg.getintregister(exprasmlist,OS_INT);
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href:=left.location.reference;
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inc(href.offset,4);
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cg.a_load_ref_reg(exprasmlist,OS_INT,OS_INT,href,hreg2);
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cg.a_op_reg_reg_reg(exprasmlist,OP_OR,OS_32,hreg1,hreg2,hreg1);
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end
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else
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cg.a_load_ref_reg(exprasmlist,opsize,opsize,left.location.reference,hreg1);
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end
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else
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begin
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if left.location.size in [OS_64,OS_S64] then
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begin
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hreg1:=cg.getintregister(exprasmlist,OS_32);
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cg.a_op_reg_reg_reg(exprasmlist,OP_OR,OS_32,left.location.register64.reghi,left.location.register64.reglo,hreg1);
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end
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else
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hreg1 := left.location.register;
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end;
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hreg2 := cg.getintregister(exprasmlist,OS_INT);
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exprasmlist.concat(taicpu.op_reg_reg_const(A_SUBIC,hreg2,hreg1,1));
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exprasmlist.concat(taicpu.op_reg_reg_reg(A_SUBFE,hreg1,hreg2,hreg1));
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end;
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LOC_FLAGS :
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begin
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hreg1:=cg.getintregister(exprasmlist,OS_INT);
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resflags:=left.location.resflags;
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cg.g_flags2reg(exprasmlist,location.size,resflags,hreg1);
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end;
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LOC_JUMP :
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begin
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hreg1:=cg.getintregister(exprasmlist,OS_INT);
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objectlibrary.getlabel(hlabel);
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cg.a_label(exprasmlist,truelabel);
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cg.a_load_const_reg(exprasmlist,OS_INT,1,hreg1);
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cg.a_jmp_always(exprasmlist,hlabel);
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cg.a_label(exprasmlist,falselabel);
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cg.a_load_const_reg(exprasmlist,OS_INT,0,hreg1);
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cg.a_label(exprasmlist,hlabel);
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end;
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else
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internalerror(10062);
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end;
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location.register := hreg1;
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truelabel:=oldtruelabel;
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falselabel:=oldfalselabel;
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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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