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https://gitlab.com/freepascal.org/fpc/source.git
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780e75bfac
* generate add.w instead of add for thumb-2 in case one of the registers
is > r8
* add register interferences for the "add" instruction so the register
allocator can detect invalid instruction forms (even for assembler code)
* fixed error in thumb2.inc detected by the previous change
git-svn-id: trunk@16633 -
382 lines
13 KiB
ObjectPascal
382 lines
13 KiB
ObjectPascal
{
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Copyright (c) 1998-2003 by Florian Klaempfl
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This unit implements the arm specific class for the register
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allocator
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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 rgcpu;
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{$i fpcdefs.inc}
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interface
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uses
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aasmbase,aasmtai,aasmdata,aasmcpu,
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cgbase,cgutils,
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cpubase,
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rgobj;
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type
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trgcpu = class(trgobj)
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procedure do_spill_read(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);override;
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procedure do_spill_written(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);override;
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procedure add_constraints(reg:tregister);override;
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function get_spill_subreg(r:tregister) : tsubregister;override;
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end;
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trgcputhumb2 = class(trgobj)
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procedure do_spill_read(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);override;
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procedure do_spill_written(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);override;
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end;
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trgintcputhumb2 = class(trgcputhumb2)
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procedure add_cpu_interferences(p : tai);override;
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end;
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trgintcpu = class(trgcpu)
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procedure add_cpu_interferences(p : tai);override;
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end;
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implementation
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uses
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verbose, cutils,globtype,
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cgobj,
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procinfo;
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procedure trgintcputhumb2.add_cpu_interferences(p: tai);
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begin
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if p.typ=ait_instruction then
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begin
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case taicpu(p).opcode of
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A_ADD:
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begin
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if taicpu(p).ops = 3 then
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begin
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if (taicpu(p).oper[0]^.typ = top_reg) and
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(taicpu(p).oper[1]^.typ = top_reg) and
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(taicpu(p).oper[2]^.typ in [top_reg, top_shifterop]) then
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begin
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{ if d == 13 || (d == 15 && S == ‘0’) || n == 15 || m IN [13,15] then UNPREDICTABLE; }
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add_edge(getsupreg(taicpu(p).oper[0]^.reg), RS_R13);
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if taicpu(p).oppostfix <> PF_S then
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add_edge(getsupreg(taicpu(p).oper[0]^.reg), RS_R15);
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add_edge(getsupreg(taicpu(p).oper[1]^.reg), RS_R15);
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if (taicpu(p).oper[2]^.typ = top_shifterop) and
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(taicpu(p).oper[2]^.shifterop^.rs <> NR_NO) then
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begin
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add_edge(getsupreg(taicpu(p).oper[2]^.shifterop^.rs), RS_R13);
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add_edge(getsupreg(taicpu(p).oper[2]^.shifterop^.rs), RS_R15);
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end
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else if (taicpu(p).oper[2]^.typ = top_reg) then
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begin
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add_edge(getsupreg(taicpu(p).oper[2]^.reg), RS_R13);
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add_edge(getsupreg(taicpu(p).oper[2]^.reg), RS_R15);
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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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procedure trgcpu.do_spill_read(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);
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var
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tmpref : treference;
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helplist : TAsmList;
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l : tasmlabel;
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hreg : tregister;
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begin
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{ don't load spilled register between
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mov lr,pc
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mov pc,r4
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but befure the mov lr,pc
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}
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if assigned(pos.previous) and
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(pos.typ=ait_instruction) and
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(taicpu(pos).opcode=A_MOV) and
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(taicpu(pos).oper[0]^.typ=top_reg) and
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(taicpu(pos).oper[0]^.reg=NR_R14) and
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(taicpu(pos).oper[1]^.typ=top_reg) and
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(taicpu(pos).oper[1]^.reg=NR_PC) then
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pos:=tai(pos.previous);
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if abs(spilltemp.offset)>4095 then
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begin
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helplist:=TAsmList.create;
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reference_reset(tmpref,sizeof(aint));
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{ create consts entry }
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current_asmdata.getjumplabel(l);
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cg.a_label(current_procinfo.aktlocaldata,l);
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tmpref.symboldata:=current_procinfo.aktlocaldata.last;
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current_procinfo.aktlocaldata.concat(tai_const.Create_32bit(spilltemp.offset));
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{ load consts entry }
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if getregtype(tempreg)=R_INTREGISTER then
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hreg:=getregisterinline(helplist,[R_SUBWHOLE])
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else
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hreg:=cg.getintregister(helplist,OS_ADDR);
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tmpref.symbol:=l;
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tmpref.base:=NR_R15;
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helplist.concat(taicpu.op_reg_ref(A_LDR,hreg,tmpref));
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reference_reset_base(tmpref,current_procinfo.framepointer,0,sizeof(aint));
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tmpref.index:=hreg;
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if spilltemp.index<>NR_NO then
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internalerror(200401263);
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helplist.concat(spilling_create_load(tmpref,tempreg));
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if getregtype(tempreg)=R_INTREGISTER then
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ungetregisterinline(helplist,hreg);
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list.insertlistafter(pos,helplist);
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helplist.free;
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end
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else
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inherited do_spill_read(list,pos,spilltemp,tempreg);
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end;
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procedure trgcpu.do_spill_written(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);
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var
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tmpref : treference;
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helplist : TAsmList;
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l : tasmlabel;
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hreg : tregister;
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begin
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if abs(spilltemp.offset)>4095 then
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begin
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helplist:=TAsmList.create;
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reference_reset(tmpref,sizeof(aint));
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{ create consts entry }
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current_asmdata.getjumplabel(l);
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cg.a_label(current_procinfo.aktlocaldata,l);
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tmpref.symboldata:=current_procinfo.aktlocaldata.last;
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current_procinfo.aktlocaldata.concat(tai_const.Create_32bit(spilltemp.offset));
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{ load consts entry }
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if getregtype(tempreg)=R_INTREGISTER then
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hreg:=getregisterinline(helplist,[R_SUBWHOLE])
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else
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hreg:=cg.getintregister(helplist,OS_ADDR);
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tmpref.symbol:=l;
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tmpref.base:=NR_R15;
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helplist.concat(taicpu.op_reg_ref(A_LDR,hreg,tmpref));
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if spilltemp.index<>NR_NO then
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internalerror(200401263);
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reference_reset_base(tmpref,current_procinfo.framepointer,0,sizeof(pint));
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tmpref.index:=hreg;
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helplist.concat(spilling_create_store(tempreg,tmpref));
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if getregtype(tempreg)=R_INTREGISTER then
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ungetregisterinline(helplist,hreg);
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list.insertlistafter(pos,helplist);
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helplist.free;
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end
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else
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inherited do_spill_written(list,pos,spilltemp,tempreg);
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end;
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procedure trgcpu.add_constraints(reg:tregister);
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var
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supreg,i : Tsuperregister;
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begin
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case getsubreg(reg) of
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{ Let 32bit floats conflict with all double precision regs > 15
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(since these don't have 32 bit equivalents) }
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R_SUBFS:
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begin
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supreg:=getsupreg(reg);
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for i:=RS_D16 to RS_D31 do
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add_edge(supreg,i);
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end;
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end;
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end;
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function trgcpu.get_spill_subreg(r:tregister) : tsubregister;
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begin
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if (getregtype(r)<>R_MMREGISTER) then
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result:=defaultsub
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else
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result:=getsubreg(r);
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end;
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procedure trgcputhumb2.do_spill_read(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);
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var
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tmpref : treference;
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helplist : TAsmList;
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l : tasmlabel;
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hreg : tregister;
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begin
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{ don't load spilled register between
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mov lr,pc
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mov pc,r4
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but befure the mov lr,pc
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}
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if assigned(pos.previous) and
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(pos.typ=ait_instruction) and
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(taicpu(pos).opcode=A_MOV) and
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(taicpu(pos).oper[0]^.typ=top_reg) and
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(taicpu(pos).oper[0]^.reg=NR_R14) and
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(taicpu(pos).oper[1]^.typ=top_reg) and
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(taicpu(pos).oper[1]^.reg=NR_PC) then
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pos:=tai(pos.previous);
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if (spilltemp.offset>4095) or (spilltemp.offset<-255) then
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begin
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helplist:=TAsmList.create;
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reference_reset(tmpref,sizeof(aint));
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{ create consts entry }
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current_asmdata.getjumplabel(l);
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cg.a_label(current_procinfo.aktlocaldata,l);
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tmpref.symboldata:=current_procinfo.aktlocaldata.last;
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current_procinfo.aktlocaldata.concat(tai_const.Create_32bit(spilltemp.offset));
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{ load consts entry }
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if getregtype(tempreg)=R_INTREGISTER then
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hreg:=getregisterinline(helplist,[R_SUBWHOLE])
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else
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hreg:=cg.getintregister(helplist,OS_ADDR);
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tmpref.symbol:=l;
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tmpref.base:=NR_R15;
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helplist.concat(taicpu.op_reg_ref(A_LDR,hreg,tmpref));
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reference_reset_base(tmpref,current_procinfo.framepointer,0,sizeof(aint));
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tmpref.index:=hreg;
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if spilltemp.index<>NR_NO then
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internalerror(200401263);
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helplist.concat(spilling_create_load(tmpref,tempreg));
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if getregtype(tempreg)=R_INTREGISTER then
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ungetregisterinline(helplist,hreg);
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list.insertlistafter(pos,helplist);
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helplist.free;
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end
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else
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inherited do_spill_read(list,pos,spilltemp,tempreg);
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end;
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procedure trgcputhumb2.do_spill_written(list:TAsmList;pos:tai;const spilltemp:treference;tempreg:tregister);
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var
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tmpref : treference;
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helplist : TAsmList;
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l : tasmlabel;
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hreg : tregister;
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begin
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if (spilltemp.offset>4095) or (spilltemp.offset<-255) then
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begin
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helplist:=TAsmList.create;
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reference_reset(tmpref,sizeof(aint));
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{ create consts entry }
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current_asmdata.getjumplabel(l);
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cg.a_label(current_procinfo.aktlocaldata,l);
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tmpref.symboldata:=current_procinfo.aktlocaldata.last;
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current_procinfo.aktlocaldata.concat(tai_const.Create_32bit(spilltemp.offset));
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{ load consts entry }
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if getregtype(tempreg)=R_INTREGISTER then
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hreg:=getregisterinline(helplist,[R_SUBWHOLE])
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else
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hreg:=cg.getintregister(helplist,OS_ADDR);
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tmpref.symbol:=l;
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tmpref.base:=NR_R15;
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helplist.concat(taicpu.op_reg_ref(A_LDR,hreg,tmpref));
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if spilltemp.index<>NR_NO then
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internalerror(200401263);
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reference_reset_base(tmpref,current_procinfo.framepointer,0,sizeof(pint));
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tmpref.index:=hreg;
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helplist.concat(spilling_create_store(tempreg,tmpref));
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if getregtype(tempreg)=R_INTREGISTER then
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ungetregisterinline(helplist,hreg);
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list.insertlistafter(pos,helplist);
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helplist.free;
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end
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else
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inherited do_spill_written(list,pos,spilltemp,tempreg);
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end;
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procedure trgintcpu.add_cpu_interferences(p : tai);
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var
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r : tregister;
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begin
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if p.typ=ait_instruction then
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begin
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case taicpu(p).opcode of
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A_MUL:
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add_edge(getsupreg(taicpu(p).oper[0]^.reg),getsupreg(taicpu(p).oper[1]^.reg));
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A_UMULL,
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A_UMLAL,
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A_SMULL,
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A_SMLAL:
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begin
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add_edge(getsupreg(taicpu(p).oper[0]^.reg),getsupreg(taicpu(p).oper[1]^.reg));
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add_edge(getsupreg(taicpu(p).oper[1]^.reg),getsupreg(taicpu(p).oper[2]^.reg));
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add_edge(getsupreg(taicpu(p).oper[0]^.reg),getsupreg(taicpu(p).oper[2]^.reg));
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end;
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A_LDRB,
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A_STRB,
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A_STR,
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A_LDR,
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A_LDRH,
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A_STRH:
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{ don't mix up the framepointer and stackpointer with pre/post indexed operations }
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if (taicpu(p).oper[1]^.typ=top_ref) and
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(taicpu(p).oper[1]^.ref^.addressmode in [AM_PREINDEXED,AM_POSTINDEXED]) then
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begin
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add_edge(getsupreg(taicpu(p).oper[1]^.ref^.base),getsupreg(current_procinfo.framepointer));
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{ FIXME: temp variable r is needed here to avoid Internal error 20060521 }
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{ while compiling the compiler. }
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r:=NR_STACK_POINTER_REG;
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if current_procinfo.framepointer<>r then
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add_edge(getsupreg(taicpu(p).oper[1]^.ref^.base),getsupreg(r));
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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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