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{
Copyright (c) 1998-2002 by Jonas Maebe, member of the Free Pascal
Development Team
This unit implements the Z80 optimizer object
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 aoptcpu;
{$i fpcdefs.inc}
{$define DEBUG_AOPTCPU}
Interface
uses cpubase, cgbase, aasmtai, aopt,AoptObj, aoptcpub;
Type
TCpuAsmOptimizer = class(TAsmOptimizer)
{ outputs a debug message into the assembler file }
procedure DebugMsg(const s: string; p: tai);
Function GetNextInstructionUsingReg(Current: tai; Var Next: tai;reg : TRegister): Boolean;
function RegLoadedWithNewValue(reg : tregister; hp : tai) : boolean; override;
function InstructionLoadsFromReg(const reg : TRegister; const hp : tai) : boolean; override;
{ uses the same constructor as TAopObj }
function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
procedure PeepHoleOptPass2;override;
End;
Implementation
uses
cutils,
verbose,
cpuinfo,
aasmbase,aasmcpu,aasmdata,
globals,globtype,
cgutils;
type
TAsmOpSet = set of TAsmOp;
function CanBeCond(p : tai) : boolean;
begin
result:=(p.typ=ait_instruction) and (taicpu(p).condition=C_None);
end;
function RefsEqual(const r1, r2: treference): boolean;
begin
refsequal :=
(r1.offset = r2.offset) and
(r1.base = r2.base) and
(r1.index = r2.index) and (r1.scalefactor = r2.scalefactor) and
(r1.symbol=r2.symbol) and (r1.refaddr = r2.refaddr) and
(r1.relsymbol = r2.relsymbol);
end;
function MatchOperand(const oper1: TOper; const oper2: TOper): boolean; inline;
begin
result:=oper1.typ=oper2.typ;
if result then
case oper1.typ of
top_const:
Result:=oper1.val = oper2.val;
top_reg:
Result:=oper1.reg = oper2.reg;
top_ref:
Result:=RefsEqual(oper1.ref^, oper2.ref^);
else Result:=false;
end
end;
function MatchOperand(const oper: TOper; const reg: TRegister): boolean; inline;
begin
result := (oper.typ = top_reg) and (oper.reg = reg);
end;
function MatchInstruction(const instr: tai; const op: TAsmOp): boolean;
begin
result :=
(instr.typ = ait_instruction) and
(taicpu(instr).opcode = op);
end;
function MatchInstruction(const instr: tai; const ops: TAsmOpSet): boolean;
begin
result :=
(instr.typ = ait_instruction) and
(taicpu(instr).opcode in ops);
end;
function MatchInstruction(const instr: tai; const ops: TAsmOpSet;opcount : byte): boolean;
begin
result :=
(instr.typ = ait_instruction) and
(taicpu(instr).opcode in ops) and
(taicpu(instr).ops=opcount);
end;
function MatchOpType(const instr : tai;ot0,ot1 : toptype) : Boolean;
begin
Result:=(taicpu(instr).ops=2) and
(taicpu(instr).oper[0]^.typ=ot0) and
(taicpu(instr).oper[1]^.typ=ot1);
end;
{$ifdef DEBUG_AOPTCPU}
procedure TCpuAsmOptimizer.DebugMsg(const s: string;p : tai);
begin
asml.insertbefore(tai_comment.Create(strpnew(s)), p);
end;
{$else DEBUG_AOPTCPU}
procedure TCpuAsmOptimizer.DebugMsg(const s: string;p : tai);inline;
begin
end;
{$endif DEBUG_AOPTCPU}
function TCpuAsmOptimizer.GetNextInstructionUsingReg(Current: tai;
var Next: tai; reg: TRegister): Boolean;
begin
Next:=Current;
repeat
Result:=GetNextInstruction(Next,Next);
until not(cs_opt_level3 in current_settings.optimizerswitches) or not(Result) or (Next.typ<>ait_instruction) or (RegInInstruction(reg,Next)) or
(is_calljmp(taicpu(Next).opcode));
end;
function TCpuAsmOptimizer.RegLoadedWithNewValue(reg: tregister; hp: tai): boolean;
var
p: taicpu;
begin
if not assigned(hp) or
(hp.typ <> ait_instruction) then
begin
Result := false;
exit;
end;
internalerror(2017032606);
//p := taicpu(hp);
//Result := ((p.opcode in [A_LDI,A_MOV,A_LDS]) and (reg=p.oper[0]^.reg) and ((p.oper[1]^.typ<>top_reg) or (reg<>p.oper[0]^.reg))) or
// ((p.opcode in [A_LD,A_LDD,A_LPM]) and (reg=p.oper[0]^.reg) and not(RegInRef(reg,p.oper[1]^.ref^))) or
// ((p.opcode in [A_MOVW]) and ((reg=p.oper[0]^.reg) or (TRegister(ord(reg)+1)=p.oper[0]^.reg)) and not(reg=p.oper[1]^.reg) and not(TRegister(ord(reg)+1)=p.oper[1]^.reg)) or
// ((p.opcode in [A_POP]) and (reg=p.oper[0]^.reg));
end;
function TCpuAsmOptimizer.InstructionLoadsFromReg(const reg: TRegister; const hp: tai): boolean;
var
p: taicpu;
i: longint;
begin
Result := false;
internalerror(2017032607);
//if not (assigned(hp) and (hp.typ = ait_instruction)) then
// exit;
//p:=taicpu(hp);
//
//i:=0;
//
//{ we do not care about the stack pointer }
//if p.opcode in [A_POP] then
// exit;
//
//{ first operand only written?
// then skip it }
//if p.opcode in [A_MOV,A_LD,A_LDD,A_LDS,A_LPM,A_LDI,A_MOVW] then
// i:=1;
//
//while(i<p.ops) do
// begin
// case p.oper[I]^.typ of
// top_reg:
// Result := (p.oper[I]^.reg = reg) or
// { MOVW }
// ((i=1) and (p.opcode=A_MOVW) and (getsupreg(p.oper[0]^.reg)+1=getsupreg(reg)));
// top_ref:
// Result :=
// (p.oper[I]^.ref^.base = reg) or
// (p.oper[I]^.ref^.index = reg);
// end;
// { Bailout if we found something }
// if Result then
// exit;
// Inc(I);
// end;
end;
function TCpuAsmOptimizer.PeepHoleOptPass1Cpu(var p: tai): boolean;
var
hp1,hp2,hp3,hp4,hp5: tai;
alloc, dealloc: tai_regalloc;
i: integer;
l: TAsmLabel;
//TmpUsedRegs : TAllUsedRegs;
begin
result := false;
//case p.typ of
// ait_instruction:
// begin
// end;
//end;
end;
procedure TCpuAsmOptimizer.PeepHoleOptPass2;
begin
end;
begin
casmoptimizer:=TCpuAsmOptimizer;
End.
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