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75 lines
2.3 KiB
ObjectPascal
75 lines
2.3 KiB
ObjectPascal
{
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Copyright (c) 1998-2014 by the Free Pascal development team
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This unit calls the optimization procedures to optimize the assembler
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code for m68k
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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
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cpubase, aoptobj, aoptcpub, aopt, aasmtai;
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Type
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TCpuAsmOptimizer = class(TAsmOptimizer)
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function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
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End;
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Implementation
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uses
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cutils, aasmcpu;
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function TCpuAsmOptimizer.PeepHoleOptPass1Cpu(var p: tai): boolean;
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var
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next: 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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//asml.insertbefore(tai_comment.Create(strpnew('pass1 called for instr')), p);
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{ LEA (Ax),Ax is a NOP if src and dest reg is equal, so remove it. }
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if getnextinstruction(p,next) and (taicpu(p).opcode = A_LEA) and
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(not assigned(taicpu(p).oper[0]^.ref^.symbol)) and
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(((taicpu(p).oper[0]^.ref^.base = taicpu(p).oper[1]^.reg) and
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(taicpu(p).oper[0]^.ref^.index = NR_NO)) or
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((taicpu(p).oper[0]^.ref^.index = taicpu(p).oper[1]^.reg) and
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(taicpu(p).oper[0]^.ref^.base = NR_NO))) and
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(taicpu(p).oper[0]^.ref^.offset = 0) then
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begin
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//asml.insertbefore(tai_comment.Create(strpnew('LEA (Ax),Ax removed')), p);
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asml.remove(p);
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p.free;
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p:=next;
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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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begin
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casmoptimizer:=TCpuAsmOptimizer;
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end.
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