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86 lines
2.1 KiB
ObjectPascal
86 lines
2.1 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 generic PowerPC 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 aoptppc;
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Interface
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{$i fpcdefs.inc}
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uses cpubase, cgbase, aopt, aasmtai;
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Type
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TPPCAsmOptimizer = class(TAsmOptimizer)
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function RegLoadedWithNewValue(reg : tregister; hp : tai) : boolean; override;
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End;
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Implementation
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uses
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cutils, verbose, cgcpu, cgobj, aasmcpu;
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function TPPCAsmOptimizer.RegLoadedWithNewValue(reg: tregister; hp: tai): boolean;
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var
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p: taicpu;
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begin
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Result := false;
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if not(assigned(hp) and (hp.typ = ait_instruction)) then
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exit;
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p := taicpu(hp);
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if not(p.ops > 0) then
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exit;
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case p.opcode of
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A_CMP,
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A_CMPI,
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A_CMPL,
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A_CMPLI:
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begin
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result:=reg=NR_CR;
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exit;
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end;
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A_STB,
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{ the register forming the address is modified so no new value is loaded }
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A_STBU,
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A_STBUX,
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A_STBX,
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A_STH,
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A_STHBRX,
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A_STHU,
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A_STHUX,
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A_STHX,
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A_STMW:
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exit;
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else
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;
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end;
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case p.oper[0]^.typ of
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top_reg:
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Result := (p.oper[0]^.reg = reg) ;
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else
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;
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end;
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end;
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End.
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