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{
Copyright (c) 1998-2002 by Jonas Maebe, member of the Free Pascal
Development Team
This unit implements the ARM 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}
Interface
uses cpubase, cgbase, aasmtai, aopt, aoptcpub;
Type
TCpuAsmOptimizer = class(TAsmOptimizer)
Function GetNextInstructionUsingReg(Current: tai; Var Next: tai;reg : TRegister): Boolean;
{ uses the same constructor as TAopObj }
function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
procedure PeepHoleOptPass2;override;
End;
Implementation
uses
cpuinfo,
aasmbase,aasmcpu,
globals,globtype;
function CanBeCond(p : tai) : boolean;
begin
result:=(p.typ=ait_instruction) and (taicpu(p).condition=C_None);
end;
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.PeepHoleOptPass1Cpu(var p: tai): boolean;
var
hp1,hp2,hp3: tai;
alloc, dealloc: tai_regalloc;
i: integer;
begin
result := false;
case p.typ of
ait_instruction:
begin
case taicpu(p).opcode of
A_LDI:
begin
{ turn
ldi reg0, imm
cp reg1, reg0
dealloc reg0
into
cpi reg1, imm
}
if (taicpu(p).ops=2) and
(taicpu(p).oper[0]^.typ=top_reg) and
(taicpu(p).oper[1]^.typ=top_const) and
GetNextInstructionUsingReg(p, hp1, taicpu(p).oper[0]^.reg) and
(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
(taicpu(hp1).opcode=A_CP) and
(taicpu(hp1).ops=2) and
(taicpu(hp1).oper[1]^.typ=top_reg) and
(getsupreg(taicpu(hp1).oper[0]^.reg) in [16..31]) and
(taicpu(hp1).oper[1]^.reg=taicpu(p).oper[0]^.reg) and
assigned(FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next))) then
begin
taicpu(hp1).opcode:=A_CPI;
taicpu(hp1).loadconst(1, taicpu(p).oper[1]^.val);
alloc:=FindRegAllocBackward(taicpu(p).oper[0]^.reg,tai(p.Previous));
dealloc:=FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next));
if assigned(alloc) and assigned(dealloc) then
begin
asml.Remove(alloc);
alloc.Free;
asml.Remove(dealloc);
dealloc.Free;
end;
GetNextInstruction(p,hp1);
asml.Remove(p);
p.Free;
p:=hp1;
result:=true;
end;
end;
A_CLR:
begin
{ turn the common
clr rX
mov/ld rX, rY
into
mov/ld rX, rY
}
if (taicpu(p).ops=1) and
(taicpu(p).oper[0]^.typ=top_reg) and
GetNextInstructionUsingReg(p, hp1, taicpu(p).oper[0]^.reg) and
(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
(hp1.typ=ait_instruction) and
(taicpu(hp1).opcode in [A_MOV,A_LD]) and
(taicpu(hp1).ops>0) and
(taicpu(hp1).oper[0]^.typ=top_reg) and
(taicpu(hp1).oper[0]^.reg=taicpu(p).oper[0]^.reg) then
begin
asml.Remove(p);
p.Free;
p:=hp1;
result:=true;
end
{ turn
clr rX
...
adc rY, rX
into
...
adc rY, r1
}
else if (taicpu(p).ops=1) and
(taicpu(p).oper[0]^.typ=top_reg) and
GetNextInstructionUsingReg(p, hp1, taicpu(p).oper[0]^.reg) and
(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
(hp1.typ=ait_instruction) and
(taicpu(hp1).opcode in [A_ADC,A_SBC]) and
(taicpu(hp1).ops=2) and
(taicpu(hp1).oper[1]^.typ=top_reg) and
(taicpu(hp1).oper[1]^.reg=taicpu(p).oper[0]^.reg) and
(taicpu(hp1).oper[0]^.reg<>taicpu(p).oper[0]^.reg) and
assigned(FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next))) then
begin
taicpu(hp1).oper[1]^.reg:=NR_R1;
alloc:=FindRegAllocBackward(taicpu(p).oper[0]^.reg,tai(p.Previous));
dealloc:=FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next));
if assigned(alloc) and assigned(dealloc) then
begin
asml.Remove(alloc);
alloc.Free;
asml.Remove(dealloc);
dealloc.Free;
end;
GetNextInstruction(p,hp1);
asml.Remove(p);
p.free;
p:=hp1;
result:=true;
end;
end;
A_PUSH:
begin
{ turn
push reg0
push reg1
pop reg3
pop reg2
into
movw reg2,reg0
}
if (taicpu(p).ops=1) and
(taicpu(p).oper[0]^.typ=top_reg) and
GetNextInstruction(p,hp1) and
(hp1.typ=ait_instruction) and
(taicpu(hp1).opcode=A_PUSH) and
(getsupreg(taicpu(hp1).oper[0]^.reg)=getsupreg(taicpu(p).oper[0]^.reg)+1) and
((getsupreg(taicpu(p).oper[0]^.reg) mod 2)=0) and
GetNextInstruction(hp1,hp2) and
(hp2.typ=ait_instruction) and
(taicpu(hp2).opcode=A_POP) and
GetNextInstruction(hp2,hp3) and
(hp3.typ=ait_instruction) and
(taicpu(hp3).opcode=A_POP) and
(getsupreg(taicpu(hp2).oper[0]^.reg)=getsupreg(taicpu(hp3).oper[0]^.reg)+1) and
((getsupreg(taicpu(hp3).oper[0]^.reg) mod 2)=0) then
begin
taicpu(p).ops:=2;
taicpu(p).opcode:=A_MOVW;
taicpu(p).loadreg(1, taicpu(p).oper[0]^.reg);
taicpu(p).loadreg(0, taicpu(hp3).oper[0]^.reg);
asml.Remove(hp1);
hp1.Free;
asml.Remove(hp2);
hp2.Free;
asml.Remove(hp3);
hp3.Free;
result:=true;
end;
end;
A_MOV:
begin
{ turn
mov reg0, reg1
push reg0
dealloc reg0
into
push reg1
}
if (taicpu(p).ops=2) and
(taicpu(p).oper[0]^.typ = top_reg) and
(taicpu(p).oper[1]^.typ = top_reg) and
GetNextInstructionUsingReg(p,hp1,taicpu(p).oper[0]^.reg) and
(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
(hp1.typ = ait_instruction) and
(taicpu(hp1).opcode in [A_PUSH,A_MOV,A_CP,A_CPC,A_ADD,A_SUB,A_EOR,A_AND,A_OR]) and
RegInInstruction(taicpu(p).oper[0]^.reg, hp1) and
(not RegModifiedByInstruction(taicpu(p).oper[0]^.reg, hp1)) and
{(taicpu(hp1).ops=1) and
(taicpu(hp1).oper[0]^.typ = top_reg) and
(taicpu(hp1).oper[0]^.reg=taicpu(p).oper[0]^.reg) and }
assigned(FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next))) then
begin
for i := 0 to taicpu(hp1).ops-1 do
if taicpu(hp1).oper[i]^.typ=top_reg then
if taicpu(hp1).oper[i]^.reg=taicpu(p).oper[0]^.reg then
taicpu(hp1).oper[i]^.reg:=taicpu(p).oper[1]^.reg;
alloc:=FindRegAllocBackward(taicpu(p).oper[0]^.reg,tai(p.Previous));
dealloc:=FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next));
if assigned(alloc) and assigned(dealloc) then
begin
asml.Remove(alloc);
alloc.Free;
asml.Remove(dealloc);
dealloc.Free;
end;
GetNextInstruction(p,hp1);
asml.Remove(p);
p.free;
p:=hp1;
result:=true;
end
{ fold
mov reg2,reg0
mov reg3,reg1
to
movw reg2,reg0
}
else if (CPUAVR_HAS_MOVW in cpu_capabilities[current_settings.cputype]) and
(taicpu(p).ops=2) and
(taicpu(p).oper[0]^.typ = top_reg) and
(taicpu(p).oper[1]^.typ = top_reg) and
getnextinstruction(p,hp1) and
(hp1.typ = ait_instruction) and
(taicpu(hp1).opcode = A_MOV) and
(taicpu(hp1).ops=2) and
(taicpu(hp1).oper[0]^.typ = top_reg) and
(taicpu(hp1).oper[1]^.typ = top_reg) and
(getsupreg(taicpu(hp1).oper[0]^.reg)=getsupreg(taicpu(p).oper[0]^.reg)+1) and
((getsupreg(taicpu(p).oper[0]^.reg) mod 2)=0) and
((getsupreg(taicpu(p).oper[1]^.reg) mod 2)=0) and
(getsupreg(taicpu(hp1).oper[1]^.reg)=getsupreg(taicpu(p).oper[1]^.reg)+1) then
begin
alloc:=FindRegAllocBackward(taicpu(hp1).oper[0]^.reg,tai(hp1.Previous));
if assigned(alloc) then
begin
asml.Remove(alloc);
asml.InsertBefore(alloc,p);
end;
taicpu(p).opcode:=A_MOVW;
asml.remove(hp1);
hp1.free;
result := true;
end;
end;
end;
end;
end;
end;
procedure TCpuAsmOptimizer.PeepHoleOptPass2;
begin
end;
begin
casmoptimizer:=TCpuAsmOptimizer;
End.
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