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2227045e23
Add support for .set and .weak on AVR. Fix 64 bit negation on AVR. Add cpu_capabilities to cpuinfo.pas and fixed some peephole optimizations. Pass >4 byte parameters by reference. git-svn-id: trunk@26943 -
320 lines
12 KiB
ObjectPascal
320 lines
12 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Jonas Maebe, member of the Free Pascal
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Development Team
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This unit implements the ARM optimizer object
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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Unit aoptcpu;
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{$i fpcdefs.inc}
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Interface
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uses cpubase, cgbase, aasmtai, aopt, aoptcpub;
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Type
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TCpuAsmOptimizer = class(TAsmOptimizer)
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Function GetNextInstructionUsingReg(Current: tai; Var Next: tai;reg : TRegister): Boolean;
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{ uses the same constructor as TAopObj }
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function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
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procedure PeepHoleOptPass2;override;
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End;
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Implementation
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uses
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cpuinfo,
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aasmbase,aasmcpu,
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globals,globtype;
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function CanBeCond(p : tai) : boolean;
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begin
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result:=(p.typ=ait_instruction) and (taicpu(p).condition=C_None);
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end;
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function TCpuAsmOptimizer.GetNextInstructionUsingReg(Current: tai;
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var Next: tai; reg: TRegister): Boolean;
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begin
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Next:=Current;
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repeat
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Result:=GetNextInstruction(Next,Next);
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until not(cs_opt_level3 in current_settings.optimizerswitches) or not(Result) or (Next.typ<>ait_instruction) or (RegInInstruction(reg,Next)) or
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(is_calljmp(taicpu(Next).opcode));
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end;
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function TCpuAsmOptimizer.PeepHoleOptPass1Cpu(var p: tai): boolean;
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var
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hp1,hp2,hp3: tai;
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alloc, dealloc: tai_regalloc;
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i: integer;
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begin
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result := false;
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case p.typ of
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ait_instruction:
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begin
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case taicpu(p).opcode of
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A_LDI:
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begin
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{ turn
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ldi reg0, imm
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cp reg1, reg0
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dealloc reg0
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into
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cpi reg1, imm
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}
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if (taicpu(p).ops=2) and
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(taicpu(p).oper[0]^.typ=top_reg) and
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(taicpu(p).oper[1]^.typ=top_const) and
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GetNextInstructionUsingReg(p, hp1, taicpu(p).oper[0]^.reg) and
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(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
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(taicpu(hp1).opcode=A_CP) and
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(taicpu(hp1).ops=2) and
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(taicpu(hp1).oper[1]^.typ=top_reg) and
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(getsupreg(taicpu(hp1).oper[0]^.reg) in [16..31]) and
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(taicpu(hp1).oper[1]^.reg=taicpu(p).oper[0]^.reg) and
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assigned(FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next))) then
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begin
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taicpu(hp1).opcode:=A_CPI;
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taicpu(hp1).loadconst(1, taicpu(p).oper[1]^.val);
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alloc:=FindRegAllocBackward(taicpu(p).oper[0]^.reg,tai(p.Previous));
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dealloc:=FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next));
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if assigned(alloc) and assigned(dealloc) then
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begin
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asml.Remove(alloc);
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alloc.Free;
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asml.Remove(dealloc);
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dealloc.Free;
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end;
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GetNextInstruction(p,hp1);
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asml.Remove(p);
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p.Free;
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p:=hp1;
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result:=true;
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end;
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end;
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A_CLR:
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begin
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{ turn the common
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clr rX
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mov/ld rX, rY
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into
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mov/ld rX, rY
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}
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if (taicpu(p).ops=1) and
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(taicpu(p).oper[0]^.typ=top_reg) and
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GetNextInstructionUsingReg(p, hp1, taicpu(p).oper[0]^.reg) and
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(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
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(hp1.typ=ait_instruction) and
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(taicpu(hp1).opcode in [A_MOV,A_LD]) and
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(taicpu(hp1).ops>0) and
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(taicpu(hp1).oper[0]^.typ=top_reg) and
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(taicpu(hp1).oper[0]^.reg=taicpu(p).oper[0]^.reg) then
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begin
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asml.Remove(p);
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p.Free;
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p:=hp1;
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result:=true;
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end
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{ turn
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clr rX
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...
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adc rY, rX
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into
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...
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adc rY, r1
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}
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else if (taicpu(p).ops=1) and
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(taicpu(p).oper[0]^.typ=top_reg) and
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GetNextInstructionUsingReg(p, hp1, taicpu(p).oper[0]^.reg) and
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(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
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(hp1.typ=ait_instruction) and
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(taicpu(hp1).opcode in [A_ADC,A_SBC]) and
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(taicpu(hp1).ops=2) and
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(taicpu(hp1).oper[1]^.typ=top_reg) and
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(taicpu(hp1).oper[1]^.reg=taicpu(p).oper[0]^.reg) and
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(taicpu(hp1).oper[0]^.reg<>taicpu(p).oper[0]^.reg) and
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assigned(FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next))) then
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begin
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taicpu(hp1).oper[1]^.reg:=NR_R1;
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alloc:=FindRegAllocBackward(taicpu(p).oper[0]^.reg,tai(p.Previous));
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dealloc:=FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next));
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if assigned(alloc) and assigned(dealloc) then
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begin
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asml.Remove(alloc);
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alloc.Free;
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asml.Remove(dealloc);
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dealloc.Free;
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end;
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GetNextInstruction(p,hp1);
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asml.Remove(p);
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p.free;
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p:=hp1;
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result:=true;
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end;
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end;
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A_PUSH:
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begin
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{ turn
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push reg0
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push reg1
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pop reg3
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pop reg2
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into
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movw reg2,reg0
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}
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if (taicpu(p).ops=1) and
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(taicpu(p).oper[0]^.typ=top_reg) and
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GetNextInstruction(p,hp1) and
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(hp1.typ=ait_instruction) and
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(taicpu(hp1).opcode=A_PUSH) and
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(getsupreg(taicpu(hp1).oper[0]^.reg)=getsupreg(taicpu(p).oper[0]^.reg)+1) and
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((getsupreg(taicpu(p).oper[0]^.reg) mod 2)=0) and
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GetNextInstruction(hp1,hp2) and
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(hp2.typ=ait_instruction) and
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(taicpu(hp2).opcode=A_POP) and
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GetNextInstruction(hp2,hp3) and
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(hp3.typ=ait_instruction) and
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(taicpu(hp3).opcode=A_POP) and
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(getsupreg(taicpu(hp2).oper[0]^.reg)=getsupreg(taicpu(hp3).oper[0]^.reg)+1) and
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((getsupreg(taicpu(hp3).oper[0]^.reg) mod 2)=0) then
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begin
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taicpu(p).ops:=2;
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taicpu(p).opcode:=A_MOVW;
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taicpu(p).loadreg(1, taicpu(p).oper[0]^.reg);
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taicpu(p).loadreg(0, taicpu(hp3).oper[0]^.reg);
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asml.Remove(hp1);
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hp1.Free;
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asml.Remove(hp2);
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hp2.Free;
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asml.Remove(hp3);
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hp3.Free;
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result:=true;
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end;
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end;
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A_MOV:
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begin
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{ turn
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mov reg0, reg1
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push reg0
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dealloc reg0
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into
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push reg1
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}
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if (taicpu(p).ops=2) and
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(taicpu(p).oper[0]^.typ = top_reg) and
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(taicpu(p).oper[1]^.typ = top_reg) and
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GetNextInstructionUsingReg(p,hp1,taicpu(p).oper[0]^.reg) and
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(not RegModifiedBetween(taicpu(p).oper[0]^.reg, p, hp1)) and
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(hp1.typ = ait_instruction) and
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(taicpu(hp1).opcode in [A_PUSH,A_MOV,A_CP,A_CPC,A_ADD,A_SUB,A_EOR,A_AND,A_OR]) and
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RegInInstruction(taicpu(p).oper[0]^.reg, hp1) and
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(not RegModifiedByInstruction(taicpu(p).oper[0]^.reg, hp1)) and
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{(taicpu(hp1).ops=1) and
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(taicpu(hp1).oper[0]^.typ = top_reg) and
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(taicpu(hp1).oper[0]^.reg=taicpu(p).oper[0]^.reg) and }
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assigned(FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next))) then
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begin
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for i := 0 to taicpu(hp1).ops-1 do
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if taicpu(hp1).oper[i]^.typ=top_reg then
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if taicpu(hp1).oper[i]^.reg=taicpu(p).oper[0]^.reg then
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taicpu(hp1).oper[i]^.reg:=taicpu(p).oper[1]^.reg;
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alloc:=FindRegAllocBackward(taicpu(p).oper[0]^.reg,tai(p.Previous));
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dealloc:=FindRegDeAlloc(taicpu(p).oper[0]^.reg,tai(hp1.Next));
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if assigned(alloc) and assigned(dealloc) then
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begin
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asml.Remove(alloc);
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alloc.Free;
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asml.Remove(dealloc);
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dealloc.Free;
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end;
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GetNextInstruction(p,hp1);
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asml.Remove(p);
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p.free;
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p:=hp1;
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result:=true;
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end
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{ fold
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mov reg2,reg0
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mov reg3,reg1
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to
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movw reg2,reg0
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}
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else if (CPUAVR_HAS_MOVW in cpu_capabilities[current_settings.cputype]) and
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(taicpu(p).ops=2) and
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(taicpu(p).oper[0]^.typ = top_reg) and
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(taicpu(p).oper[1]^.typ = top_reg) and
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getnextinstruction(p,hp1) and
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(hp1.typ = ait_instruction) and
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(taicpu(hp1).opcode = A_MOV) and
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(taicpu(hp1).ops=2) and
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(taicpu(hp1).oper[0]^.typ = top_reg) and
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(taicpu(hp1).oper[1]^.typ = top_reg) and
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(getsupreg(taicpu(hp1).oper[0]^.reg)=getsupreg(taicpu(p).oper[0]^.reg)+1) and
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((getsupreg(taicpu(p).oper[0]^.reg) mod 2)=0) and
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((getsupreg(taicpu(p).oper[1]^.reg) mod 2)=0) and
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(getsupreg(taicpu(hp1).oper[1]^.reg)=getsupreg(taicpu(p).oper[1]^.reg)+1) then
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begin
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alloc:=FindRegAllocBackward(taicpu(hp1).oper[0]^.reg,tai(hp1.Previous));
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if assigned(alloc) then
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begin
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asml.Remove(alloc);
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asml.InsertBefore(alloc,p);
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end;
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taicpu(p).opcode:=A_MOVW;
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asml.remove(hp1);
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hp1.free;
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result := true;
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end;
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end;
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end;
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end;
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end;
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end;
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procedure TCpuAsmOptimizer.PeepHoleOptPass2;
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begin
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end;
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begin
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casmoptimizer:=TCpuAsmOptimizer;
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End.
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