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0e8616ed1f
because it is processor independent
* mppc68k.bat modified to undefine i386 and support_mmx
(which are defaults for i386)
354 lines
11 KiB
ObjectPascal
354 lines
11 KiB
ObjectPascal
{
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$Id$
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Copyright (C) 1993-98 by Florian Klaempfl
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This unit handles the temporary variables stuff 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 tgeni386;
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interface
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uses
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cobjects,globals,tree,hcodegen,verbose,files,aasm
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{$ifdef i386}
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,i386
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{$endif}
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;
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type
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tregisterset = set of tregister;
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tpushed = array[R_EAX..R_MM6] of boolean;
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const
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usablereg32 : byte = 4;
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{$ifdef SUPPORT_MMX}
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usableregmmx : byte = 8;
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{$endif SUPPORT_MMX}
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function getregister32 : tregister;
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procedure ungetregister32(r : tregister);
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{$ifdef SUPPORT_MMX}
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function getregistermmx : tregister;
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procedure ungetregistermmx(r : tregister);
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{$endif SUPPORT_MMX}
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procedure ungetregister(r : tregister);
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procedure cleartempgen;
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procedure del_reference(const ref : treference);
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procedure del_locref(const location : tlocation);
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{ pushs and restores registers }
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procedure pushusedregisters(var pushed : tpushed;b : byte);
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procedure popusedregisters(const pushed : tpushed);
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var
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unused,usableregs : tregisterset;
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c_usableregs : longint;
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{ uses only 1 byte while a set uses in FPC 32 bytes }
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usedinproc : byte;
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{ count, how much a register must be pushed if it is used as register }
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{ variable }
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{$ifdef SUPPORT_MMX}
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reg_pushes : array[R_EAX..R_MM6] of longint;
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is_reg_var : array[R_EAX..R_MM6] of boolean;
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{$else SUPPORT_MMX}
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reg_pushes : array[R_EAX..R_EDI] of longint;
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is_reg_var : array[R_EAX..R_EDI] of boolean;
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{$endif SUPPORT_MMX}
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implementation
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procedure pushusedregisters(var pushed : tpushed;b : byte);
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var
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r : tregister;
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{$ifdef SUPPORT_MMX}
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hr : preference;
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{$endif SUPPORT_MMX}
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begin
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usedinproc:=usedinproc or b;
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for r:=R_EAX to R_EBX do
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begin
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pushed[r]:=false;
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{ if the register is used by the calling subroutine }
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if ((b and ($80 shr byte(r)))<>0) then
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begin
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{ and is present in use }
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if not(r in unused) then
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begin
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{ then save it }
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exprasmlist^.concat(new(pai386,op_reg(A_PUSH,S_L,r)));
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{ here was a big problem !!!!!}
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{ you cannot do that for a register that is
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globally assigned to a var
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this also means that you must push it much more
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often, but there must be a better way
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maybe by putting the value back to the stack !! }
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if not(is_reg_var[r]) then
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unused:=unused+[r];
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pushed[r]:=true;
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end;
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end;
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end;
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{$ifdef SUPPORT_MMX}
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for r:=R_MM0 to R_MM6 do
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begin
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pushed[r]:=false;
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{ if the mmx register is in use, save it }
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if not(r in unused) then
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begin
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exprasmlist^.concat(new(pai386,op_const_reg(
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A_SUB,S_L,8,R_ESP)));
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new(hr);
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reset_reference(hr^);
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hr^.base:=R_ESP;
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exprasmlist^.concat(new(pai386,op_reg_ref(
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A_MOVQ,S_NO,r,hr)));
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if not(is_reg_var[r]) then
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unused:=unused+[r];
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pushed[r]:=true;
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end;
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end;
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{$endif SUPPORT_MMX}
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end;
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procedure popusedregisters(const pushed : tpushed);
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var
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r : tregister;
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{$ifdef SUPPORT_MMX}
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hr : preference;
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{$endif SUPPORT_MMX}
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begin
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{ restore in reverse order: }
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{$ifdef SUPPORT_MMX}
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for r:=R_MM6 downto R_MM0 do
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begin
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if pushed[r] then
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begin
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new(hr);
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reset_reference(hr^);
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hr^.base:=R_ESP;
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exprasmlist^.concat(new(pai386,op_ref_reg(
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A_MOVQ,S_NO,hr,r)));
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exprasmlist^.concat(new(pai386,op_const_reg(
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A_ADD,S_L,8,R_ESP)));
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unused:=unused-[r];
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end;
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end;
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{$endif SUPPORT_MMX}
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for r:=R_EBX downto R_EAX do
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if pushed[r] then
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begin
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exprasmlist^.concat(new(pai386,op_reg(A_POP,S_L,r)));
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unused:=unused-[r];
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end;
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end;
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procedure ungetregister(r : tregister);
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begin
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if r in [R_EAX,R_ECX,R_EDX,R_EBX,R_ESP,R_EBP,R_ESI,R_EDI] then
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ungetregister32(r)
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else if r in [R_AX,R_CX,R_DX,R_BX,R_SP,R_BP,R_SI,R_DI] then
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ungetregister32(reg16toreg32(r))
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else if r in [R_AL,R_BL,R_CL,R_DL] then
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ungetregister32(reg8toreg32(r))
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{$ifdef SUPPORT_MMX}
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else if r in [R_MM0..R_MM6] then
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ungetregistermmx(r)
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{$endif SUPPORT_MMX}
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else internalerror(18);
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end;
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procedure ungetregister32(r : tregister);
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begin
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if cs_maxoptimieren in aktswitches then
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begin
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{ takes much time }
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if not(r in usableregs) then
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exit;
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unused:=unused+[r];
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inc(usablereg32);
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end
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else
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begin
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if not(r in [R_EAX,R_EBX,R_ECX,R_EDX]) then
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exit;
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unused:=unused+[r];
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inc(usablereg32);
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end;
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{$ifdef REGALLOC}
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exprasmlist^.concat(new(pairegdealloc,init(r)));
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{$endif REGALLOC}
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end;
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{$ifdef SUPPORT_MMX}
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function getregistermmx : tregister;
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var
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r : tregister;
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begin
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dec(usableregmmx);
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for r:=R_MM0 to R_MM6 do
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if r in unused then
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begin
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unused:=unused-[r];
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usedinproc:=usedinproc or ($80 shr byte(R_EAX));
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getregistermmx:=r;
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exit;
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end;
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internalerror(10);
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end;
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procedure ungetregistermmx(r : tregister);
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begin
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if cs_maxoptimieren in aktswitches then
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begin
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{ takes much time }
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if not(r in usableregs) then
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exit;
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unused:=unused+[r];
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inc(usableregmmx);
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end
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else
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begin
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unused:=unused+[r];
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inc(usableregmmx);
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end;
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end;
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{$endif SUPPORT_MMX}
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procedure del_reference(const ref : treference);
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begin
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if ref.isintvalue then
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exit;
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ungetregister32(ref.base);
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ungetregister32(ref.index);
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{ ref.segment:=R_DEFAULT_SEG; }
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end;
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procedure del_locref(const location : tlocation);
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begin
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if (location.loc<>loc_mem) and (location.loc<>loc_reference) then
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exit;
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if location.reference.isintvalue then
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exit;
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ungetregister32(location.reference.base);
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ungetregister32(location.reference.index);
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{ ref.segment:=R_DEFAULT_SEG; }
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end;
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function getregister32 : tregister;
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begin
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dec(usablereg32);
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if R_EAX in unused then
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begin
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unused:=unused-[R_EAX];
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usedinproc:=usedinproc or ($80 shr byte(R_EAX));
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getregister32:=R_EAX;
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end
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else if R_EDX in unused then
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begin
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unused:=unused-[R_EDX];
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usedinproc:=usedinproc or ($80 shr byte(R_EDX));
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getregister32:=R_EDX;
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end
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else if R_EBX in unused then
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begin
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unused:=unused-[R_EBX];
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usedinproc:=usedinproc or ($80 shr byte(R_EBX));
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getregister32:=R_EBX;
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end
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else if R_ECX in unused then
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begin
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unused:=unused-[R_ECX];
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usedinproc:=usedinproc or ($80 shr byte(R_ECX));
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getregister32:=R_ECX;
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end
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else internalerror(10);
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end;
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procedure cleartempgen;
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begin
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unused:=usableregs;
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usablereg32:=c_usableregs;
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end;
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begin
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usableregs:=[R_EAX,R_EBX,R_ECX,R_EDX];
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{$ifdef SUPPORT_MMX}
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usableregs:=usableregs+[R_MM0..R_MM6];
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{$endif SUPPORT_MMX}
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c_usableregs:=4;
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end.
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{
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$Log$
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Revision 1.7 1998-06-08 13:13:47 pierre
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+ temporary variables now in temp_gen.pas unit
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because it is processor independent
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* mppc68k.bat modified to undefine i386 and support_mmx
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(which are defaults for i386)
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Revision 1.6 1998/05/20 09:42:38 pierre
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+ UseTokenInfo now default
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* unit in interface uses and implementation uses gives error now
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* only one error for unknown symbol (uses lastsymknown boolean)
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the problem came from the label code !
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+ first inlined procedures and function work
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(warning there might be allowed cases were the result is still wrong !!)
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* UseBrower updated gives a global list of all position of all used symbols
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with switch -gb
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Revision 1.5 1998/05/11 13:07:58 peter
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+ $ifdef NEWPPU for the new ppuformat
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+ $define GDB not longer required
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* removed all warnings and stripped some log comments
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* no findfirst/findnext anymore to remove smartlink *.o files
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Revision 1.4 1998/04/29 10:34:08 pierre
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+ added some code for ansistring (not complete nor working yet)
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* corrected operator overloading
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* corrected nasm output
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+ started inline procedures
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+ added starstarn : use ** for exponentiation (^ gave problems)
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+ started UseTokenInfo cond to get accurate positions
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Revision 1.3 1998/04/09 22:16:36 florian
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* problem with previous REGALLOC solved
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* improved property support
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Revision 1.2 1998/04/09 15:46:39 florian
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+ register allocation tracing stuff added
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}
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