{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate ARM 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 narmcnv;
{$i fpcdefs.inc}
interface
uses
node,ncnv,ncgcnv,defcmp;
type
tarmtypeconvnode = class(tcgtypeconvnode)
protected
function first_int_to_real: 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; }
end;
implementation
uses
verbose,globtype,globals,systems,
symconst,symdef,aasmbase,aasmtai,aasmdata,
defutil,
cgbase,cgutils,
pass_1,pass_2,procinfo,
ncon,ncal,
ncgutil,
cpubase,aasmcpu,
rgobj,tgobj,cgobj,cgcpu;
{*****************************************************************************
FirstTypeConv
*****************************************************************************}
function tarmtypeconvnode.first_int_to_real: tnode;
var
fname: string[19];
begin
if cs_fp_emulation in current_settings.moduleswitches then
result:=inherited first_int_to_real
else
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;
end;
procedure tarmtypeconvnode.second_int_to_real;
var
instr : taicpu;
href : treference;
l1,l2 : tasmlabel;
hregister : tregister;
begin
{ convert first to double to avoid precision loss }
location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
location_force_reg(current_asmdata.CurrAsmList,left.location,OS_32,true);
location.register:=cg.getfpuregister(current_asmdata.CurrAsmList,location.size);
instr:=taicpu.op_reg_reg(A_FLT,location.register,left.location.register);
if is_signed(left.resultdef) then
begin
instr.oppostfix:=cgsize2fpuoppostfix[def_cgsize(resultdef)];;
current_asmdata.CurrAsmList.concat(instr);
end
else
begin
{ flt does a signed load, fix this }
case tfloatdef(resultdef).floattype of
s32real,
s64real:
begin
{ converting dword to s64real first and cut off at the end avoids precision loss }
instr.oppostfix:=PF_D;
current_asmdata.CurrAsmList.concat(instr);
current_asmdata.getdatalabel(l1);
current_asmdata.getjumplabel(l2);
reference_reset_symbol(href,l1,0);
current_asmdata.CurrAsmList.concat(Taicpu.op_reg_const(A_CMP,left.location.register,0));
cg.a_jmp_flags(current_asmdata.CurrAsmList,F_GE,l2);
hregister:=cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
current_asmdata.asmlists[al_typedconsts].concat(tai_align.create(const_align(8)));
current_asmdata.asmlists[al_typedconsts].concat(Tai_label.Create(l1));
{ I got this constant from a test program (FK) }
current_asmdata.asmlists[al_typedconsts].concat(Tai_const.Create_32bit($41f00000));
current_asmdata.asmlists[al_typedconsts].concat(Tai_const.Create_32bit(0));
cg.a_loadfpu_ref_reg(current_asmdata.CurrAsmList,OS_F64,OS_F64,href,hregister);
current_asmdata.CurrAsmList.concat(setoppostfix(taicpu.op_reg_reg_reg(A_ADF,location.register,hregister,location.register),PF_D));
cg.a_label(current_asmdata.CurrAsmList,l2);
{ cut off if we should convert to single }
if tfloatdef(resultdef).floattype=s32real then
begin
hregister:=location.register;
location.register:=cg.getfpuregister(current_asmdata.CurrAsmList,location.size);
current_asmdata.CurrAsmList.concat(setoppostfix(taicpu.op_reg_reg(A_MVF,location.register,hregister),PF_S));
end;
end;
else
internalerror(200410031);
end;
end;
end;
procedure tarmtypeconvnode.second_int_to_bool;
var
hregister : tregister;
href : treference;
resflags : tresflags;
hlabel,oldTrueLabel,oldFalseLabel : tasmlabel;
begin
oldTrueLabel:=current_procinfo.CurrTrueLabel;
oldFalseLabel:=current_procinfo.CurrFalseLabel;
current_asmdata.getjumplabel(current_procinfo.CurrTrueLabel);
current_asmdata.getjumplabel(current_procinfo.CurrFalseLabel);
secondpass(left);
if codegenerror then
exit;
{ byte(boolean) or word(wordbool) or longint(longbool) must
be accepted for var parameters }
if (nf_explicit in flags) and
(left.resultdef.size=resultdef.size) and
(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER]) then
begin
location_copy(location,left.location);
current_procinfo.CurrTrueLabel:=oldTrueLabel;
current_procinfo.CurrFalseLabel:=oldFalseLabel;
exit;
end;
{ Load left node into flag F_NE/F_E }
resflags:=F_NE;
case left.location.loc of
LOC_CREFERENCE,
LOC_REFERENCE :
begin
if left.location.size in [OS_64,OS_S64] then
begin
hregister:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_32,OS_32,left.location.reference,hregister);
href:=left.location.reference;
inc(href.offset,4);
tcgarm(cg).cgsetflags:=true;
cg.a_op_ref_reg(current_asmdata.CurrAsmList,OP_OR,OS_32,href,hregister);
tcgarm(cg).cgsetflags:=false;
end
else
begin
location_force_reg(current_asmdata.CurrAsmList,left.location,left.location.size,true);
tcgarm(cg).cgsetflags:=true;
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_OR,left.location.size,left.location.register,left.location.register);
tcgarm(cg).cgsetflags:=false;
end;
end;
LOC_FLAGS :
begin
resflags:=left.location.resflags;
end;
LOC_REGISTER,LOC_CREGISTER :
begin
if left.location.size in [OS_64,OS_S64] then
begin
hregister:=cg.getintregister(current_asmdata.CurrAsmList,OS_32);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_32,OS_32,left.location.register64.reglo,hregister);
tcgarm(cg).cgsetflags:=true;
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_OR,OS_32,left.location.register64.reghi,hregister);
tcgarm(cg).cgsetflags:=false;
end
else
begin
tcgarm(cg).cgsetflags:=true;
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_OR,left.location.size,left.location.register,left.location.register);
tcgarm(cg).cgsetflags:=false;
end;
end;
LOC_JUMP :
begin
hregister:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
current_asmdata.getjumplabel(hlabel);
cg.a_label(current_asmdata.CurrAsmList,current_procinfo.CurrTrueLabel);
cg.a_load_const_reg(current_asmdata.CurrAsmList,OS_INT,1,hregister);
cg.a_jmp_always(current_asmdata.CurrAsmList,hlabel);
cg.a_label(current_asmdata.CurrAsmList,current_procinfo.CurrFalseLabel);
cg.a_load_const_reg(current_asmdata.CurrAsmList,OS_INT,0,hregister);
cg.a_label(current_asmdata.CurrAsmList,hlabel);
tcgarm(cg).cgsetflags:=true;
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_OR,OS_INT,hregister,hregister);
tcgarm(cg).cgsetflags:=false;
end;
else
internalerror(200311301);
end;
{ load flags to register }
location_reset(location,LOC_REGISTER,def_cgsize(resultdef));
location.register:=cg.getintregister(current_asmdata.CurrAsmList,location.size);
cg.g_flags2reg(current_asmdata.CurrAsmList,location.size,resflags,location.register);
current_procinfo.CurrTrueLabel:=oldTrueLabel;
current_procinfo.CurrFalseLabel:=oldFalseLabel;
end;
begin
ctypeconvnode:=tarmtypeconvnode;
end.
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