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{
Copyright (c) 1998-2000 by Florian Klaempfl
This unit implements the code generator for the Alpha
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.
****************************************************************************
}
{
This unit implements the code generator for the Alpha.
}
unit cgcpu;
{$i fpcdefs.inc}
interface
uses
cgbase,cgobj,aasmbase,aasmtai,aasmdata,aasmcpu,cginfo,cpubase,cpuinfo;
type
pcgalpha = ^tcgalpha;
tcgalpha = class(tcg)
procedure a_call_name(list : TAsmList;const s : string);override;
procedure a_load_const_reg(list : TAsmList;size : tcgsize;a : aword;register : tregister);override;
procedure a_load_reg_ref(list : TAsmList;size : tcgsize;register : tregister;const ref : treference);override;
procedure a_load_ref_reg(list : TAsmList;size : tcgsize;const ref : treference;register : tregister);override;
procedure a_load_reg_reg(list : TAsmList;fromsize, tosize : tcgsize;reg1,reg2 : tregister);override;
procedure a_cmp_const_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : aword;
reg : tregister; l : tasmlabel);override;
procedure a_cmp_reg_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;reg1,reg2 : tregister;l : tasmlabel);
procedure a_cmp_reg_ref_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;reg : tregister;l : tasmlabel);
procedure a_cmp_ref_const_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : aword;
reg : tregister; l : tasmlabel);
procedure a_loadaddr_ref_reg(list : TAsmList;const ref : treference;r : tregister);override;
procedure g_stackframe_entry(list : TAsmList;localsize : longint);override;
procedure g_maybe_loadself(list : TAsmList);override;
procedure g_restore_frame_pointer(list : TAsmList);override;
end;
procedure create_codegen;
implementation
uses
globtype,globals;
procedure tcgalpha.g_stackframe_entry(list : TAsmList;localsize : longint);
begin
list.concat(taicpu.op_reg_ref(A_LDGP,Global_pointer,new_reference(R_27,0)));
list.concat(taicpu.op_reg_ref(A_LDA,stack_pointer_reg,new_reference(stack_pointer_reg,-LocalSize)));
If LocalSize<>0 then
list.concat(tai_frame.create(Global_pointer,LocalSize,R_27,0));
{ Always generate a frame pointer. }
list.concat(taicpu.op_reg_reg_reg(A_BIS,stack_pointer_reg,stack_pointer_reg,frame_pointer_reg));
end;
procedure g_exitcode(list : TAsmList;parasize : longint; nostackframe,inlined : boolean);
begin
{ Restore stack pointer from frame pointer }
list.Concat (taicpu.op_reg_reg_reg(A_BIS,frame_pointer_reg,frame_pointer_reg,stack_pointer_reg));
{ Restore previous stack position}
list.Concat (taicpu.op_reg_const_reg(A_ADDQ,stack_pointer_reg,Parasize,stack_pointer_reg));
{ return... }
list.Concat(taicpu.op_reg_ref_const(A_RET,stack_pointer_reg,new_reference(Return_pointer,0),1));
{ end directive
Concat (paiend,init(''));
}
end;
procedure tcgalpha.a_call_name(list : TAsmList;const s : string);
begin
{ list^.concat(taicpu,op_sym(A_CALL,S_NO,newasmsymbol(s,AB_EXTERNAL,AT_FUNCTION)))); }
{!!!!!!!!!1 offset is ignored }
abstract;
end;
procedure tcgalpha.a_load_const_reg(list : TAsmList;size : tcgsize;a : aword;register : tregister);
begin
end;
procedure tcgalpha.a_load_reg_ref(list : TAsmList;size : tcgsize;register : tregister;const ref : treference);
begin
end;
procedure tcgalpha.a_load_ref_reg(list : TAsmList;size : tcgsize;const ref : treference;register : tregister);
begin
end;
procedure tcgalpha.a_load_reg_reg(list : TAsmList;fromsize, tosize : tcgsize;reg1,reg2 : tregister);
begin
end;
procedure tcgalpha.a_cmp_const_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : aword;reg : tregister;
l : tasmlabel);
begin
end;
procedure tcgalpha.a_cmp_reg_reg_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;reg1,reg2 : tregister;l : tasmlabel);
begin
end;
procedure tcgalpha.a_cmp_reg_ref_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;reg : tregister;l : tasmlabel);
begin
end;
procedure tcgalpha.a_cmp_ref_const_label(list : TAsmList;size : tcgsize;cmp_op : topcmp;a : aword;
reg : tregister; l : tasmlabel);
begin
end;
procedure tcgalpha.a_loadaddr_ref_reg(list : TAsmList;const ref : treference;r : tregister);
begin
end;
procedure tcgalpha.g_maybe_loadself(list : TAsmList);
begin
end;
procedure tcgalpha.g_restore_frame_pointer(list : TAsmList);
begin
end;
procedure create_codegen;
begin
cg:=tcgalpha.create;
end;
end.
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