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115 lines
3.6 KiB
ObjectPascal
115 lines
3.6 KiB
ObjectPascal
{
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Copyright (c) 1998-2016 by Florian Klaempfl and Jonas Maebe
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This unit contains helper procedures for the assembler peephole optimizer
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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 aoptutils;
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{$i fpcdefs.inc}
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interface
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uses
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cpubase,aasmtai,aasmcpu;
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function MatchOpType(const p : taicpu;type0: toptype) : Boolean;
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function MatchOpType(const p : taicpu;type0,type1 : toptype) : Boolean;
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{$if max_operands>2}
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function MatchOpType(const p : taicpu; type0,type1,type2 : toptype) : Boolean;
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{$endif max_operands>2}
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{ skips all alignment fields and returns the next label (or non-align).
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returns immediately with true if hp is a label }
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function SkipAligns(hp: tai; out hp2: tai): boolean;
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{ skips all labels and returns the next "real" instruction }
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function SkipLabels(hp: tai; out hp2: tai): boolean;
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{ sets hp2 to hp and returns True if hp is not nil }
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function SetAndTest(const hp: tai; out hp2: tai): Boolean;
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implementation
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uses
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aasmbase;
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function MatchOpType(const p : taicpu; type0: toptype) : Boolean; inline;
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begin
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Result:=(p.ops=1) and (p.oper[0]^.typ=type0);
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end;
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function MatchOpType(const p : taicpu; type0,type1 : toptype) : Boolean; inline;
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begin
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Result:=(p.ops=2) and (p.oper[0]^.typ=type0) and (p.oper[1]^.typ=type1);
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end;
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{$if max_operands>2}
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function MatchOpType(const p : taicpu; type0,type1,type2 : toptype) : Boolean; inline;
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begin
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Result:=(p.ops=3) and (p.oper[0]^.typ=type0) and (p.oper[1]^.typ=type1) and (p.oper[2]^.typ=type2);
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end;
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{$endif max_operands>2}
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{ skips all alignment fields and returns the next label (or non-align).
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Returns immediately with True if hp is a label }
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function SkipAligns(hp: tai; out hp2: tai): boolean;
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begin
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while assigned(hp) and
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(hp.typ in SkipInstr + [ait_label,ait_align]) Do
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begin
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{ Check that the label is actually live }
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if (hp.typ = ait_label) and tai_label(hp).labsym.is_used then
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Break;
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hp := tai(hp.next);
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end;
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SkipAligns := SetAndTest(hp, hp2);
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end;
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{ skips all labels and returns the next "real" instruction }
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function SkipLabels(hp: tai; out hp2: tai): boolean;
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begin
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while assigned(hp.next) and
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(tai(hp.next).typ in SkipInstr + [ait_label,ait_align]) Do
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hp := tai(hp.next);
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if assigned(hp.next) then
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begin
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SkipLabels := True;
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hp2 := tai(hp.next)
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end
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else
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begin
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hp2 := hp;
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SkipLabels := False
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end;
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end;
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{ sets hp2 to hp and returns True if hp is not nil }
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function SetAndTest(const hp: tai; out hp2: tai): Boolean; inline;
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begin
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hp2 := hp;
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Result := Assigned(hp);
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end;
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end.
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