mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-05-01 01:33:41 +02:00
a9b5e27bc1
the current pai object is a AsmBlockStart marker * changed a loop in aopt386 which was incompatible with this change
132 lines
4.1 KiB
ObjectPascal
132 lines
4.1 KiB
ObjectPascal
{
|
|
$Id$
|
|
Copyright (c) 1998 by Jonas Maebe
|
|
|
|
This unit calls the optimization procedures to optimize the assembler
|
|
code for i386+
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
****************************************************************************
|
|
}
|
|
Unit aopt386;
|
|
|
|
Interface
|
|
|
|
Uses
|
|
aasm;
|
|
|
|
Procedure Optimize(AsmL: PAasmOutput);
|
|
|
|
Implementation
|
|
|
|
Uses
|
|
globtype,
|
|
globals,
|
|
DAOpt386,POpt386,CSOpt386;
|
|
|
|
|
|
Procedure Optimize(AsmL: PAasmOutput);
|
|
Var BlockStart, BlockEnd, HP: Pai;
|
|
Begin
|
|
{setup labeltable, always necessary}
|
|
BlockStart := Pai(AsmL^.First);
|
|
BlockEnd := DFAPass1(AsmL, BlockStart);
|
|
{Blockend now either contains an ait_marker with Kind = AsmBlockStart, or nil}
|
|
While Assigned(BlockStart) Do
|
|
Begin
|
|
{peephole optimizations}
|
|
PeepHoleOptPass1(AsmL, BlockStart, BlockEnd);
|
|
PeepHoleOptPass1(AsmL, BlockStart, BlockEnd);
|
|
{data flow analyzer}
|
|
If (cs_slowoptimize in aktglobalswitches) Then
|
|
Begin
|
|
If DFAPass2(
|
|
{$ifdef statedebug}
|
|
AsmL,
|
|
{$endif statedebug}
|
|
BlockStart, BlockEnd) Then
|
|
{common subexpression elimination}
|
|
CSE(AsmL, BlockStart, BlockEnd);
|
|
End;
|
|
{more peephole optimizations}
|
|
PeepHoleOptPass2(AsmL, BlockStart, BlockEnd);
|
|
{dispose labeltabel}
|
|
ShutDownDFA;
|
|
{continue where we left off, BlockEnd is either the start of an assembler
|
|
block or nil}
|
|
BlockStart := BlockEnd;
|
|
While Assigned(BlockStart) And
|
|
(BlockStart^.typ = ait_Marker) And
|
|
(Pai_Marker(BlockStart)^.Kind = AsmBlockStart) Do
|
|
Begin
|
|
{we stopped at an assembler block, so skip it}
|
|
Repeat
|
|
BlockStart := Pai(BlockStart^.Next);
|
|
Until (BlockStart^.Typ = Ait_Marker) And
|
|
(Pai_Marker(Blockstart)^.Kind = AsmBlockEnd);
|
|
{blockstart now contains a pai_marker(asmblockend)}
|
|
If GetNextInstruction(BlockStart, HP) And
|
|
((HP^.typ <> ait_Marker) Or
|
|
(Pai_Marker(HP)^.Kind <> AsmBlockStart)) Then
|
|
{there is no assembler block anymore after the current one, so
|
|
optimize the next block of "normal" instructions}
|
|
BlockEnd := DFAPass1(AsmL, BlockStart)
|
|
{otherwise, skip the next assembler block}
|
|
Else BlockStart := HP;
|
|
End
|
|
End;
|
|
End;
|
|
|
|
End.
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.29 1999-10-23 14:44:24 jonas
|
|
* finally got around making GetNextInstruction return false when
|
|
the current pai object is a AsmBlockStart marker
|
|
* changed a loop in aopt386 which was incompatible with this change
|
|
|
|
Revision 1.28 1999/05/08 20:39:02 jonas
|
|
+ some comments
|
|
|
|
Revision 1.27 1999/04/18 17:57:17 jonas
|
|
* fix for crash when the first instruction of a sequence that gets
|
|
optimized is removed (this situation can't occur aymore now)
|
|
|
|
Revision 1.26 1999/03/31 13:55:03 peter
|
|
* assembler inlining working for ag386bin
|
|
|
|
Revision 1.25 1998/12/29 19:58:27 jonas
|
|
* fixed crash when there are two asm blocks right after each other
|
|
|
|
Revision 1.24 1998/12/29 18:48:23 jonas
|
|
+ optimize pascal code surrounding assembler blocks
|
|
|
|
Revision 1.23 1998/12/11 00:02:43 peter
|
|
+ globtype,tokens,version unit splitted from globals
|
|
|
|
Revision 1.22 1998/08/19 16:07:57 jonas
|
|
* changed optimizer switches + cleanup of DestroyRefs in daopt386.pas
|
|
|
|
Revision 1.21 1998/08/06 19:40:29 jonas
|
|
* removed $ before and after Log in comment
|
|
|
|
Revision 1.20 1998/08/05 16:00:08 florian
|
|
* some fixes for ansi strings
|
|
* log to Log changed
|
|
|
|
}
|