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126 lines
3.9 KiB
ObjectPascal
126 lines
3.9 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998 by Jonas Maebe
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This unit calls the optimization procedures to optimize the assembler
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code for i386+
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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 aopt386;
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Interface
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Uses
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aasm;
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Procedure Optimize(AsmL: PAasmOutput);
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Implementation
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Uses
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globtype,
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globals,
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DAOpt386,POpt386,CSOpt386;
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Procedure Optimize(AsmL: PAasmOutput);
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Var BlockStart, BlockEnd, HP: Pai;
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Begin
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{setup labeltable, always necessary}
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BlockStart := Pai(AsmL^.First);
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BlockEnd := DFAPass1(AsmL, BlockStart);
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{Blockend now either contains an ait_marker with Kind = AsmBlockStart, or nil}
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While Assigned(BlockStart) Do
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Begin
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{peephole optimizations}
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PeepHoleOptPass1(AsmL, BlockStart, BlockEnd);
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PeepHoleOptPass1(AsmL, BlockStart, BlockEnd);
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{data flow analyzer}
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If (cs_slowoptimize in aktglobalswitches) Then
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Begin
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If DFAPass2(
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{$ifdef statedebug}
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AsmL,
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{$endif statedebug}
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BlockStart, BlockEnd) Then
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{common subexpression elimination}
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CSE(AsmL, BlockStart, BlockEnd);
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End;
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{more peephole optimizations}
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PeepHoleOptPass2(AsmL, BlockStart, BlockEnd);
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{dispose labeltabel}
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ShutDownDFA;
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{continue where we left off, BlockEnd is either the start of an assembler
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block or nil}
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BlockStart := BlockEnd;
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While Assigned(BlockStart) And
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(BlockStart^.typ = ait_Marker) And
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(Pai_Marker(BlockStart)^.Kind = AsmBlockStart) Do
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Begin
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{we stopped at an assembler block, so skip it}
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While GetNextInstruction(BlockStart, BlockStart) And
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((BlockStart^.Typ <> Ait_Marker) Or
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(Pai_Marker(Blockstart)^.Kind <> AsmBlockEnd)) Do;
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{blockstart now contains a pai_marker(asmblockend)}
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If GetNextInstruction(BlockStart, HP) And
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((HP^.typ <> ait_Marker) Or
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(Pai_Marker(HP)^.Kind <> AsmBlockStart)) Then
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{there is no assembler block anymore after the current one, so
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optimize the next block of "normal" instructions}
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BlockEnd := DFAPass1(AsmL, BlockStart)
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{otherwise, skip the next assembler block}
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Else BlockStart := HP;
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End
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End;
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End;
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End.
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{
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$Log$
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Revision 1.28 1999-05-08 20:39:02 jonas
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+ some comments
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Revision 1.27 1999/04/18 17:57:17 jonas
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* fix for crash when the first instruction of a sequence that gets
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optimized is removed (this situation can't occur aymore now)
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Revision 1.26 1999/03/31 13:55:03 peter
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* assembler inlining working for ag386bin
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Revision 1.25 1998/12/29 19:58:27 jonas
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* fixed crash when there are two asm blocks right after each other
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Revision 1.24 1998/12/29 18:48:23 jonas
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+ optimize pascal code surrounding assembler blocks
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Revision 1.23 1998/12/11 00:02:43 peter
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+ globtype,tokens,version unit splitted from globals
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Revision 1.22 1998/08/19 16:07:57 jonas
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* changed optimizer switches + cleanup of DestroyRefs in daopt386.pas
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Revision 1.21 1998/08/06 19:40:29 jonas
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* removed $ before and after Log in comment
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Revision 1.20 1998/08/05 16:00:08 florian
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* some fixes for ansi strings
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* log to Log changed
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}
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