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101 lines
3.0 KiB
ObjectPascal
101 lines
3.0 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, aasmtai, aopt, aoptcpub;
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Type
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TCpuAsmOptimizer = class(TAsmOptimizer)
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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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aasmbase,aasmcpu,cgbase;
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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.PeepHoleOptPass1Cpu(var p: tai): boolean;
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var
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next1: tai;
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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_MOV:
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begin
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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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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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getnextinstruction(p,next1) and
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(next1.typ = ait_instruction) and
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(taicpu(next1).opcode = A_MOV) and
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(taicpu(next1).ops=2) and
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(taicpu(next1).oper[0]^.typ = top_reg) and
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(taicpu(next1).oper[1]^.typ = top_reg) and
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(getsupreg(taicpu(next1).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(next1).oper[1]^.reg)=getsupreg(taicpu(p).oper[1]^.reg)+1) then
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begin
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taicpu(p).opcode:=A_MOVW;
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asml.remove(next1);
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next1.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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