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https://gitlab.com/freepascal.org/fpc/source.git
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4686f61002
so that they can still be freed after the reference has been changed
(e.g. in case of array indexing or record field accesses) (mantis #33628)
git-svn-id: trunk@38814 -
391 lines
15 KiB
ObjectPascal
391 lines
15 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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{$i fpcdefs.inc}
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{$define DEBUG_AOPTCPU}
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Interface
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uses
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cpubase, aoptobj, aoptcpub, aopt, aasmtai,
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cgbase;
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Type
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TCpuAsmOptimizer = class(TAsmOptimizer)
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function RegLoadedWithNewValue(reg: tregister; hp: tai): boolean; override;
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function PeepHoleOptPass1Cpu(var p: tai): boolean; override;
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function TryToOptimizeMove(var p: tai): boolean;
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{ outputs a debug message into the assembler file }
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procedure DebugMsg(const s: string; p: tai);
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End;
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Implementation
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uses
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cutils, aasmcpu, cgutils, globals, verbose, cpuinfo, itcpugas;
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function opname(var p: tai): string;
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begin
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result:=upcase(gas_op2str[taicpu(p).opcode]);
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end;
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function RefsEqual(const r1, r2: treference): boolean;
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begin
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RefsEqual :=
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(r1.offset = r2.offset) and
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(r1.base = r2.base) and
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(r1.index = r2.index) and (r1.scalefactor = r2.scalefactor) and
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(r1.symbol=r2.symbol) and (r1.refaddr = r2.refaddr) and
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(r1.relsymbol = r2.relsymbol);
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end;
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function MatchOperand(const oper1: TOper; const oper2: TOper): boolean;
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begin
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result := oper1.typ = oper2.typ;
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if result then
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case oper1.typ of
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top_const:
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Result:=oper1.val = oper2.val;
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top_reg:
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Result:=oper1.reg = oper2.reg;
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top_ref:
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Result:=RefsEqual(oper1.ref^, oper2.ref^);
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else
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internalerror(2016112401);
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end
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end;
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function TCpuAsmOptimizer.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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if not assigned(hp) or
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(hp.typ <> ait_instruction) then
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begin
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Result := false;
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exit;
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end;
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p := taicpu(hp);
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Result :=
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((p.opcode in [A_MOVE,A_MOVEA,A_MVS,A_MVZ,A_MOVEQ,A_LEA]) and
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(p.oper[1]^.typ = top_reg) and
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(SuperRegistersEqual(p.oper[1]^.reg,reg)) and
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((p.oper[0]^.typ = top_const) or
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((p.oper[0]^.typ = top_reg) and
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not(SuperRegistersEqual(p.oper[0]^.reg,reg))) or
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((p.oper[0]^.typ = top_ref) and
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not RegInRef(reg,p.oper[0]^.ref^)))) or
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((p.opcode = A_FMOVE) and
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(p.oper[1]^.typ = top_reg) and
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(SuperRegistersEqual(p.oper[1]^.reg,reg)) and
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((p.oper[0]^.typ = top_realconst) or
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((p.oper[0]^.typ = top_reg) and
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not(SuperRegistersEqual(p.oper[0]^.reg,reg))))) or
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((p.opcode = A_MOVEM) and
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(p.oper[1]^.typ = top_regset) and
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((getsupreg(reg) in p.oper[1]^.dataregset) or
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(getsupreg(reg) in p.oper[1]^.addrregset))) or
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((p.opcode = A_FMOVEM) and
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(p.oper[1]^.typ = top_regset) and
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(getsupreg(reg) in p.oper[1]^.fpuregset));
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end;
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{$ifdef DEBUG_AOPTCPU}
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procedure TCpuAsmOptimizer.DebugMsg(const s: string; p : tai);
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begin
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asml.insertbefore(tai_comment.Create(strpnew(s)), p);
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end;
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{$else DEBUG_AOPTCPU}
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procedure TCpuAsmOptimizer.DebugMsg(const s: string; p : tai);inline;
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begin
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end;
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{$endif DEBUG_AOPTCPU}
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function TCpuAsmOptimizer.TryToOptimizeMove(var p: tai): boolean;
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var
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next, next2: tai;
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opstr: string[15];
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begin
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result:=false;
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if GetNextInstruction(p,next) and
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(taicpu(next).typ = ait_instruction) and
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(taicpu(next).opcode = taicpu(p).opcode) and
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(taicpu(p).opsize = taicpu(next).opsize) and
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(taicpu(p).oper[1]^.typ = top_reg) and
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MatchOperand(taicpu(p).oper[1]^,taicpu(next).oper[0]^) then
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begin
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if not(RegInOp(taicpu(p).oper[1]^.reg,taicpu(next).oper[1]^)) and
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RegEndOfLife(taicpu(next).oper[0]^.reg, taicpu(next)) then
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begin
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opstr:=opname(p);
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case taicpu(p).oper[0]^.typ of
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top_reg:
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begin
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{ move %reg0, %tmpreg; move %tmpreg, <ea> -> move %reg0, <ea> }
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taicpu(p).loadOper(1,taicpu(next).oper[1]^);
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asml.remove(next);
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next.free;
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result:=true;
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{ also remove leftover move %reg0, %reg0, which can occur as the result
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of the previous optimization, if %reg0 and %tmpreg was different types
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(addr vs. data), so these moves were left in by the cg }
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if MatchOperand(taicpu(p).oper[0]^,taicpu(p).oper[1]^) then
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begin
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DebugMsg('Optimizer: '+opstr+' + '+opstr+' removed',p);
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asml.remove(p);
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p.free;
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end
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else
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DebugMsg('Optimizer: '+opstr+' + '+opstr+' to '+opstr+' #1',p)
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end;
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top_const:
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begin
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// DebugMsg('Optimizer: '+opstr+' + '+opstr+' to '+opstr+' #2',p);
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end;
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top_ref:
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begin
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{ move ref, %tmpreg; move %tmpreg, <ea> -> move ref, <ea> }
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{ we only want to do this when <ea> is a reg or a simple reference }
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with taicpu(next).oper[1]^ do
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if (taicpu(next).opcode <> A_FMOVE) and
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((typ = top_reg) or
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((typ = top_ref) and
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((ref^.index = NR_NO) or
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(ref^.base = NR_NO)) and
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(ref^.symbol = nil) and
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(ref^.offset = 0))) then
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begin
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DebugMsg('Optimizer: '+opstr+' + '+opstr+' to '+opstr+' #3',p);
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taicpu(p).loadOper(1,taicpu(next).oper[1]^);
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asml.remove(next);
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next.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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exit;
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end;
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if GetNextInstruction(p,next) and
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(taicpu(next).typ = ait_instruction) and
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GetNextInstruction(next,next2) and
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(taicpu(next2).typ = ait_instruction) and
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(taicpu(next).opcode <> taicpu(p).opcode) and
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(taicpu(next2).opcode = taicpu(p).opcode) 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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(getregtype(taicpu(p).oper[0]^.reg) = getregtype(taicpu(p).oper[1]^.reg)) and
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MatchOperand(taicpu(p).oper[1]^,taicpu(next2).oper[0]^) and
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MatchOperand(taicpu(next2).oper[1]^,taicpu(p).oper[0]^) and
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(taicpu(p).opsize = taicpu(next2).opsize) and
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((taicpu(p).opcode = A_FMOVE) or
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(taicpu(p).opsize = taicpu(next).opsize)) then
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begin
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opstr:=opname(p);
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if not(RegInOp(taicpu(p).oper[1]^.reg,taicpu(next2).oper[1]^)) and
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not(RegInOp(taicpu(p).oper[1]^.reg,taicpu(next).oper[0]^)) and
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RegEndOfLife(taicpu(p).oper[0]^.reg, taicpu(next2)) then
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begin
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{ move %reg0, %tmpreg
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op ???, %tmpreg
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move %tmpreg, %reg0
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to:
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op ???, %reg0 }
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if MatchOperand(taicpu(p).oper[1]^,taicpu(next).oper[taicpu(next).ops-1]^) then
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begin
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{
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Disabled, because it breaks some tests... :( (KB)
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DebugMsg('Optimizer: '+opstr+' + OP + '+opstr+' to OP #1',next);
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taicpu(next).loadOper(taicpu(next).ops-1,taicpu(p).oper[0]^);
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asml.remove(p);
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asml.remove(next2);
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p.free;
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next2.free;
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result:=true;
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}
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end;
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end;
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end;
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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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next: tai;
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tmpref: treference;
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tmpsingle: single;
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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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case taicpu(p).opcode of
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A_MOVE:
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result:=TryToOptimizeMove(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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A_LEA:
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if 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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DebugMsg('Optimizer: LEA 0(Ax),Ax removed',p);
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asml.remove(p);
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p.free;
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result:=true;
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end;
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{ Address register sub/add can be replaced with ADDQ/SUBQ or LEA if the value is in the
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SmallInt range, which is shorter to encode and faster to execute on most 68k }
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A_SUB,A_SUBA,A_ADD,A_ADDA:
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if (taicpu(p).oper[1]^.typ = top_reg) and isaddressregister(taicpu(p).oper[1]^.reg) and
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(taicpu(p).oper[0]^.typ = top_const) then
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begin
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if isvalueforaddqsubq(taicpu(p).oper[0]^.val) then
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begin
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DebugMsg('Optimizer: SUB/ADD #val,Ax to SUBQ/ADDQ',p);
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taicpu(p).opsize:=S_L; // this is safe, because we're targetting an address reg
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if taicpu(p).opcode in [A_ADD,A_ADDA] then
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taicpu(p).opcode:=A_ADDQ
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else
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taicpu(p).opcode:=A_SUBQ;
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result:=true;
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end
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else
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if isvalue16bit(abs(taicpu(p).oper[0]^.val)) then
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begin
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DebugMsg('Optimizer: SUB/ADD #val,Ax to LEA val(Ax),Ax',p);
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if taicpu(p).opcode in [A_SUB,A_SUBA] then
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reference_reset_base(tmpref,taicpu(p).oper[1]^.reg,-taicpu(p).oper[0]^.val,ctempposinvalid,0,[])
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else
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reference_reset_base(tmpref,taicpu(p).oper[1]^.reg,taicpu(p).oper[0]^.val,ctempposinvalid,0,[]);
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taicpu(p).opcode:=A_LEA;
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taicpu(p).loadref(0,tmpref);
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result:=true;
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end;
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end;
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{ MOVEA #0,Ax to SUBA Ax,Ax, because it's shorter }
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A_MOVEA:
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if (taicpu(p).oper[0]^.typ = top_const) and
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(taicpu(p).oper[0]^.val = 0) then
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begin
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DebugMsg('Optimizer: MOVEA #0,Ax to SUBA Ax,Ax',p);
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taicpu(p).opcode:=A_SUBA;
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taicpu(p).opsize:=S_L; { otherwise it will be .W -> BOOM }
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taicpu(p).loadoper(0,taicpu(p).oper[1]^);
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result:=true;
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end;
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{ CLR.L Dx on a 68000 is slower than MOVEQ #0,Dx }
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A_CLR:
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if (current_settings.cputype in [cpu_mc68000]) and
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(taicpu(p).oper[0]^.typ = top_reg) and
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(taicpu(p).opsize = S_L) and
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isintregister(taicpu(p).oper[0]^.reg) then
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begin
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//DebugMsg('Optimizer: CLR.L Dx to MOVEQ #0,Dx',p);
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taicpu(p).opcode:=A_MOVEQ;
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taicpu(p).loadoper(1,taicpu(p).oper[0]^);
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taicpu(p).loadconst(0,0);
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taicpu(p).ops:=2;
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result:=true;
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end;
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{ CMP #0,<ea> equals to TST <ea>, just shorter and TST is more flexible anyway }
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A_CMP,A_CMPI:
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if (taicpu(p).oper[0]^.typ = top_const) and
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(taicpu(p).oper[0]^.val = 0) then
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begin
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DebugMsg('Optimizer: CMP #0 to TST',p);
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taicpu(p).opcode:=A_TST;
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taicpu(p).loadoper(0,taicpu(p).oper[1]^);
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taicpu(p).clearop(1);
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taicpu(p).ops:=1;
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result:=true;
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end;
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A_FCMP:
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if (taicpu(p).oper[0]^.typ = top_realconst) then
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begin
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if (taicpu(p).oper[0]^.val_real = 0.0) then
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begin
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DebugMsg('Optimizer: FCMP #0.0 to FTST',p);
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taicpu(p).opcode:=A_FTST;
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taicpu(p).opsize:=S_FX;
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taicpu(p).loadoper(0,taicpu(p).oper[1]^);
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taicpu(p).clearop(1);
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taicpu(p).ops:=1;
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result:=true;
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end
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else
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begin
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tmpsingle:=taicpu(p).oper[0]^.val_real;
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if (taicpu(p).opsize = S_FD) and
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((taicpu(p).oper[0]^.val_real - tmpsingle) = 0.0) then
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begin
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DebugMsg('Optimizer: FCMP const to lesser precision',p);
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taicpu(p).opsize:=S_FS;
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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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A_FMOVE,A_FMUL,A_FADD,A_FSUB,A_FDIV:
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begin
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if (taicpu(p).opcode = A_FMOVE) and TryToOptimizeMove(p) then
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begin
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result:=true;
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exit;
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end;
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if (taicpu(p).oper[0]^.typ = top_realconst) then
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begin
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tmpsingle:=taicpu(p).oper[0]^.val_real;
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if (taicpu(p).opsize = S_FD) and
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((taicpu(p).oper[0]^.val_real - tmpsingle) = 0.0) then
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begin
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DebugMsg('Optimizer: FMOVE/FMUL/FADD/FSUB/FDIV const to lesser precision',p);
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taicpu(p).opsize:=S_FS;
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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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end;
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begin
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casmoptimizer:=TCpuAsmOptimizer;
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end.
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