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{
Copyright (c) 1998-2002 by Jonas Maebe, member of the Free Pascal
Development Team
This unit contains several types and constants necessary for the
optimizer to work on the ARM architecture
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 aoptcpub; { Assembler OPTimizer CPU specific Base }
{$i fpcdefs.inc}
{ enable the following define if memory references can have both a base and }
{ index register in 1 operand }
{ enable the following define if memory references can have a scaled index }
{ define RefsHaveScale}
{ enable the following define if memory references can have a segment }
{ override }
{ define RefsHaveSegment}
Interface
Uses
cgbase,aasmtai,
cpubase,aasmcpu,AOptBase;
Type
{ type of a normal instruction }
TInstr = Taicpu;
PInstr = ^TInstr;
{ ************************************************************************* }
{ **************************** TCondRegs ********************************** }
{ ************************************************************************* }
{ Info about the conditional registers }
TCondRegs = Object
Constructor Init;
Destructor Done;
End;
{ ************************************************************************* }
{ **************************** TAoptBaseCpu ******************************* }
{ ************************************************************************* }
TAoptBaseCpu = class(TAoptBase)
function RegModifiedByInstruction(Reg: TRegister; p1: tai): boolean; override;
End;
{ ************************************************************************* }
{ ******************************* Constants ******************************* }
{ ************************************************************************* }
Const
{ the maximum number of things (registers, memory, ...) a single instruction }
{ changes }
MaxCh = 3;
{ the maximum number of operands an instruction has }
MaxOps = 4;
{Oper index of operand that contains the source (reference) with a load }
{instruction }
LoadSrc = 0;
{Oper index of operand that contains the destination (register) with a load }
{instruction }
LoadDst = 1;
{Oper index of operand that contains the source (register) with a store }
{instruction }
StoreSrc = 0;
{Oper index of operand that contains the destination (reference) with a load }
{instruction }
StoreDst = 1;
aopt_uncondjmp = A_B;
aopt_condjmp = A_B;
Implementation
{ ************************************************************************* }
{ **************************** TCondRegs ********************************** }
{ ************************************************************************* }
Constructor TCondRegs.init;
Begin
End;
Destructor TCondRegs.Done; {$ifdef inl} inline; {$endif inl}
Begin
End;
function TAoptBaseCpu.RegModifiedByInstruction(Reg: TRegister; p1: tai): boolean;
var
i : Longint;
begin
result:=false;
for i:=0 to taicpu(p1).ops-1 do
if (taicpu(p1).oper[i]^.typ=top_reg) and (taicpu(p1).oper[i]^.reg=Reg) and (taicpu(p1).spilling_get_operation_type(i) in [operand_write,operand_readwrite]) then
begin
result:=true;
exit;
end;
end;
End.
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