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fpc/compiler/powerpc/cgcpu.pas

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
This unit implements the code generator for the PowerPC
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 cgcpu;
{$i fpcdefs.inc}
interface
uses
cgbase,cgobj,
aasmbase,aasmcpu,aasmtai,
cpubase,cpuinfo,node,cg64f32,cginfo;
type
tcgppc = class(tcg)
{ passing parameters, per default the parameter is pushed }
{ nr gives the number of the parameter (enumerated from }
{ left to right), this allows to move the parameter to }
{ register, if the cpu supports register calling }
{ conventions }
procedure a_param_const(list : taasmoutput;size : tcgsize;a : aword;const locpara : tparalocation);override;
procedure a_param_ref(list : taasmoutput;size : tcgsize;const r : treference;const locpara : tparalocation);override;
procedure a_paramaddr_ref(list : taasmoutput;const r : treference;const locpara : tparalocation);override;
procedure a_call_name(list : taasmoutput;const s : string);override;
procedure a_op_const_reg(list : taasmoutput; Op: TOpCG; a: AWord; reg: TRegister); override;
procedure a_op_reg_reg(list : taasmoutput; Op: TOpCG; size: TCGSize; src, dst: TRegister); override;
procedure a_op_const_reg_reg(list: taasmoutput; op: TOpCg;
size: tcgsize; a: aword; src, dst: tregister); override;
procedure a_op_reg_reg_reg(list: taasmoutput; op: TOpCg;
size: tcgsize; src1, src2, dst: tregister); override;
{ move instructions }
procedure a_load_const_reg(list : taasmoutput; size: tcgsize; a : aword;reg : tregister);override;
procedure a_load_reg_ref(list : taasmoutput; size: tcgsize; reg : tregister;const ref : treference);override;
procedure a_load_ref_reg(list : taasmoutput;size : tcgsize;const Ref : treference;reg : tregister);override;
procedure a_load_reg_reg(list : taasmoutput;size : tcgsize;reg1,reg2 : tregister);override;
procedure a_load_sym_ofs_reg(list: taasmoutput; const sym: tasmsymbol; ofs: longint; reg: tregister); override;
{ fpu move instructions }
procedure a_loadfpu_reg_reg(list: taasmoutput; reg1, reg2: tregister); override;
procedure a_loadfpu_ref_reg(list: taasmoutput; size: tcgsize; const ref: treference; reg: tregister); override;
procedure a_loadfpu_reg_ref(list: taasmoutput; size: tcgsize; reg: tregister; const ref: treference); override;
{ comparison operations }
procedure a_cmp_const_reg_label(list : taasmoutput;size : tcgsize;cmp_op : topcmp;a : aword;reg : tregister;
l : tasmlabel);override;
procedure a_cmp_reg_reg_label(list : taasmoutput;size : tcgsize;cmp_op : topcmp;reg1,reg2 : tregister;l : tasmlabel); override;
procedure a_jmp_always(list : taasmoutput;l: tasmlabel); override;
procedure a_jmp_flags(list : taasmoutput;const f : TResFlags;l: tasmlabel); override;
procedure g_flags2reg(list: taasmoutput; const f: TResFlags; reg: TRegister); override;
procedure g_stackframe_entry_sysv(list : taasmoutput;localsize : longint);
procedure g_stackframe_entry_mac(list : taasmoutput;localsize : longint);
procedure g_stackframe_entry(list : taasmoutput;localsize : longint);override;
procedure g_restore_frame_pointer(list : taasmoutput);override;
procedure g_return_from_proc(list : taasmoutput;parasize : aword); override;
procedure a_loadaddr_ref_reg(list : taasmoutput;const ref : treference;r : tregister);override;
procedure g_concatcopy(list : taasmoutput;const source,dest : treference;len : aword; delsource,loadref : boolean);override;
procedure g_overflowcheck(list: taasmoutput; const p: tnode); override;
{ find out whether a is of the form 11..00..11b or 00..11...00. If }
{ that's the case, we can use rlwinm to do an AND operation }
function get_rlwi_const(a: longint; var l1, l2: longint): boolean;
private
procedure a_jmp_cond(list : taasmoutput;cond : TOpCmp;l: tasmlabel);
procedure g_return_from_proc_sysv(list : taasmoutput;parasize : aword);
procedure g_return_from_proc_mac(list : taasmoutput;parasize : aword);
{ Make sure ref is a valid reference for the PowerPC and sets the }
{ base to the value of the index if (base = R_NO). }
procedure fixref(list: taasmoutput; var ref: treference);
{ contains the common code of a_load_reg_ref and a_load_ref_reg }
procedure a_load_store(list:taasmoutput;op: tasmop;reg:tregister;
ref: treference);
{ creates the correct branch instruction for a given combination }
{ of asmcondflags and destination addressing mode }
procedure a_jmp(list: taasmoutput; op: tasmop;
c: tasmcondflag; crval: longint; l: tasmlabel);
end;
tcg64fppc = class(tcg64f32)
procedure a_op64_reg_reg(list : taasmoutput;op:TOpCG;regsrc,regdst : tregister64);override;
procedure a_op64_const_reg(list : taasmoutput;op:TOpCG;value : qword;reg : tregister64);override;
end;
const
{
TOpCG2AsmOp: Array[topcg] of TAsmOp = (A_NONE,A_ADD,A_AND,A_DIVWU,
A_DIVW,A_MULLW, A_MULLW, A_NEG,A_NOT,A_OR,
A_SRAW,A_SLW,A_SRW,A_SUB,A_XOR);
}
TOpCG2AsmOpConstLo: Array[topcg] of TAsmOp = (A_NONE,A_ADDI,A_ANDI_,A_DIVWU,
A_DIVW,A_MULLW, A_MULLW, A_NONE,A_NONE,A_ORI,
A_SRAWI,A_SLWI,A_SRWI,A_SUBI,A_XORI);
TOpCG2AsmOpConstHi: Array[topcg] of TAsmOp = (A_NONE,A_ADDIS,A_ANDIS_,
A_DIVWU,A_DIVW, A_MULLW,A_MULLW,A_NONE,A_NONE,
A_ORIS,A_NONE, A_NONE,A_NONE,A_SUBIS,A_XORIS);
TOpCmp2AsmCond: Array[topcmp] of TAsmCondFlag = (C_NONE,C_EQ,C_GT,
C_LT,C_GE,C_LE,C_NE,C_LE,C_NG,C_GE,C_NL);
implementation
uses
globtype,globals,verbose,systems,cutils,symconst,symdef,rgobj;
{ parameter passing... Still needs extra support from the processor }
{ independent code generator }
procedure tcgppc.a_param_const(list : taasmoutput;size : tcgsize;a : aword;const locpara : tparalocation);
var
ref: treference;
begin
case locpara.loc of
LOC_REGISTER:
a_load_const_reg(list,size,a,locpara.register);
LOC_REFERENCE:
begin
reference_reset(ref);
ref.base:=locpara.reference.index;
ref.offset:=locpara.reference.offset;
a_load_const_ref(list,size,a,ref);
end;
else
internalerror(2002081101);
end;
if locpara.sp_fixup<>0 then
internalerror(2002081102);
end;
procedure tcgppc.a_param_ref(list : taasmoutput;size : tcgsize;const r : treference;const locpara : tparalocation);
var
ref: treference;
tmpreg: tregister;
begin
case locpara.loc of
LOC_REGISTER:
a_load_ref_reg(list,size,r,locpara.register);
LOC_REFERENCE:
begin
reference_reset(ref);
ref.base:=locpara.reference.index;
ref.offset:=locpara.reference.offset;
tmpreg := get_scratch_reg_int(list);
a_load_ref_reg(list,size,r,tmpreg);
a_load_reg_ref(list,size,tmpreg,ref);
free_scratch_reg(list,tmpreg);
end;
else
internalerror(2002081103);
end;
if locpara.sp_fixup<>0 then
internalerror(2002081104);
end;
procedure tcgppc.a_paramaddr_ref(list : taasmoutput;const r : treference;const locpara : tparalocation);
var
ref: treference;
tmpreg: tregister;
begin
{$ifdef para_sizes_known}
if (nr <= max_param_regs_int) then
a_loadaddr_ref_reg(list,size,r,param_regs_int[nr])
else
begin
reset_reference(ref);
ref.base := STACK_POINTER_REG;
ref.offset := LinkageAreaSize+para_size_till_now;
tmpreg := get_scratch_reg_address(list);
a_loadaddr_ref_reg(list,size,r,tmpreg);
a_load_reg_ref(list,size,tmpreg,ref);
free_scratch_reg(list,tmpreg);
end;
{$endif para_sizes_known}
end;
{ calling a code fragment by name }
procedure tcgppc.a_call_name(list : taasmoutput;const s : string);
var
href : treference;
begin
{ save our RTOC register value. Only necessary when doing pointer based }
{ calls or cross TOC calls, but currently done always }
reference_reset_base(href,STACK_POINTER_REG,LA_RTOC);
list.concat(taicpu.op_reg_ref(A_STW,R_TOC,href));
list.concat(taicpu.op_sym(A_BL,newasmsymbol(s)));
reference_reset_base(href,STACK_POINTER_REG,LA_RTOC);
list.concat(taicpu.op_reg_ref(A_LWZ,R_TOC,href));
end;
{********************** load instructions ********************}
procedure tcgppc.a_load_const_reg(list : taasmoutput; size: TCGSize; a : aword; reg : TRegister);
begin
if (longint(a) >= low(smallint)) and
(longint(a) <= high(smallint)) then
list.concat(taicpu.op_reg_const(A_LI,reg,longint(a)))
else if ((a and $ffff) <> 0) then
begin
list.concat(taicpu.op_reg_const(A_LI,reg,smallint(a and $ffff)));
if ((a shr 16) <> 0) then
list.concat(taicpu.op_reg_const(A_ADDIS,reg,
(a shr 16)+ord(smallint(a and $ffff) < 0)))
end
else
list.concat(taicpu.op_reg_const(A_LIS,reg,smallint(a shr 16)));
end;
procedure tcgppc.a_load_reg_ref(list : taasmoutput; size: TCGSize; reg : tregister;const ref : treference);
const
StoreInstr: Array[OS_8..OS_32,boolean, boolean] of TAsmOp =
{ indexed? updating?}
(((A_STB,A_STBU),(A_STBX,A_STBUX)),
((A_STH,A_STHU),(A_STHX,A_STHUX)),
((A_STW,A_STWU),(A_STWX,A_STWUX)));
var
op: TAsmOp;
ref2: TReference;
begin
ref2 := ref;
FixRef(list,ref2);
if size in [OS_S8..OS_S16] then
{ storing is the same for signed and unsigned values }
size := tcgsize(ord(size)-(ord(OS_S8)-ord(OS_8)));
{ 64 bit stuff should be handled separately }
if size in [OS_64,OS_S64] then
internalerror(200109236);
op := storeinstr[tcgsize2unsigned[size],ref2.index<>R_NO,false];
a_load_store(list,op,reg,ref2);
End;
procedure tcgppc.a_load_ref_reg(list : taasmoutput;size : tcgsize;const ref: treference;reg : tregister);
const
LoadInstr: Array[OS_8..OS_S32,boolean, boolean] of TAsmOp =
{ indexed? updating?}
(((A_LBZ,A_LBZU),(A_LBZX,A_LBZUX)),
((A_LHZ,A_LHZU),(A_LHZX,A_LHZUX)),
((A_LWZ,A_LWZU),(A_LWZX,A_LWZUX)),
{ 64bit stuff should be handled separately }
((A_NONE,A_NONE),(A_NONE,A_NONE)),
{ there's no load-byte-with-sign-extend :( }
((A_LBZ,A_LBZU),(A_LBZX,A_LBZUX)),
((A_LHA,A_LHAU),(A_LHAX,A_LHAUX)),
((A_LWZ,A_LWZU),(A_LWZX,A_LWZUX)));
var
op: tasmop;
tmpreg: tregister;
ref2, tmpref: treference;
begin
ref2 := ref;
fixref(list,ref2);
op := loadinstr[size,ref2.index<>R_NO,false];
a_load_store(list,op,reg,ref2);
{ sign extend shortint if necessary, since there is no }
{ load instruction that does that automatically (JM) }
if size = OS_S8 then
list.concat(taicpu.op_reg_reg(A_EXTSB,reg,reg));
end;
procedure tcgppc.a_load_reg_reg(list : taasmoutput;size : tcgsize;reg1,reg2 : tregister);
begin
if (reg1 <> reg2) then
list.concat(taicpu.op_reg_reg(A_MR,reg2,reg1));
end;
procedure tcgppc.a_load_sym_ofs_reg(list: taasmoutput; const sym: tasmsymbol; ofs: longint; reg: tregister);
begin
{ can't use op_sym_ofs_reg because sym+ofs can be > 32767!! }
internalerror(200112293);
end;
procedure tcgppc.a_loadfpu_reg_reg(list: taasmoutput; reg1, reg2: tregister);
begin
list.concat(taicpu.op_reg_reg(A_FMR,reg1,reg2));
end;
procedure tcgppc.a_loadfpu_ref_reg(list: taasmoutput; size: tcgsize; const ref: treference; reg: tregister);
const
FpuLoadInstr: Array[OS_F32..OS_F64,boolean, boolean] of TAsmOp =
{ indexed? updating?}
(((A_LFS,A_LFSU),(A_LFSX,A_LFSUX)),
((A_LFD,A_LFDU),(A_LFDX,A_LFDUX)));
var
op: tasmop;
ref2: treference;
begin
if not(size in [OS_F32,OS_F64]) then
internalerror(200201121);
ref2 := ref;
fixref(list,ref2);
op := fpuloadinstr[size,ref2.index <> R_NO,false];
a_load_store(list,op,reg,ref2);
end;
procedure tcgppc.a_loadfpu_reg_ref(list: taasmoutput; size: tcgsize; reg: tregister; const ref: treference);
const
FpuStoreInstr: Array[OS_F32..OS_F64,boolean, boolean] of TAsmOp =
{ indexed? updating?}
(((A_STFS,A_STFSU),(A_STFSX,A_STFSUX)),
((A_STFD,A_STFDU),(A_STFDX,A_STFDUX)));
var
op: tasmop;
ref2: treference;
begin
if not(size in [OS_F32,OS_F64]) then
internalerror(200201122);
ref2 := ref;
fixref(list,ref2);
op := fpustoreinstr[size,ref2.index <> R_NO,false];
a_load_store(list,op,reg,ref2);
end;
procedure tcgppc.a_op_const_reg(list : taasmoutput; Op: TOpCG; a: AWord; reg: TRegister);
var
scratch_register: TRegister;
begin
case op of
OP_DIV, OP_IDIV, OP_IMUL, OP_MUL, OP_ADD, OP_AND, OP_OR, OP_SUB,
OP_XOR:
a_op_const_reg_reg(list,op,OS_32,a,reg,reg);
OP_SHL,OP_SHR,OP_SAR:
begin
if (a and 31) <> 0 then
list.concat(taicpu.op_reg_reg_const(
TOpCG2AsmOpConstLo[op],reg,reg,a and 31));
if (a shr 5) <> 0 then
internalError(68991);
end
else internalError(68992);
end;
end;
procedure tcgppc.a_op_reg_reg(list : taasmoutput; Op: TOpCG; size: TCGSize; src, dst: TRegister);
begin
a_op_reg_reg_reg(list,op,OS_32,src,dst,dst);
end;
procedure tcgppc.a_op_const_reg_reg(list: taasmoutput; op: TOpCg;
size: tcgsize; a: aword; src, dst: tregister);
var
l1,l2: longint;
var
oplo, ophi: tasmop;
scratchreg: tregister;
useReg: boolean;
begin
ophi := TOpCG2AsmOpConstHi[op];
oplo := TOpCG2AsmOpConstLo[op];
{ constants in a PPC instruction are always interpreted as signed }
{ 16bit values, so if the value is between low(smallint) and }
{ high(smallint), it's easy }
if (op in [OP_ADD,OP_SUB,OP_AND,OP_OR,OP_XOR]) then
begin
if (a = 0) then
begin
if op = OP_AND then
list.concat(taicpu.op_reg_const(A_LI,dst,0));
exit;
end
else if (a = high(aword)) and
(op in [OP_AND,OP_OR]) then
begin
if op = OP_OR then
list.concat(taicpu.op_reg_const(A_LI,dst,-1));
exit;
end
else if (longint(a) >= low(smallint)) and
(longint(a) <= high(smallint)) then
begin
list.concat(taicpu.op_reg_reg_const(oplo,dst,src,a));
exit;
end;
{ all basic constant instructions also have a shifted form that }
{ works only on the highest 16bits, so if low(a) is 0, we can }
{ use that one }
if (lo(a) = 0) then
begin
list.concat(taicpu.op_reg_reg_const(ophi,dst,src,hi(a)));
exit;
end;
end;
{ otherwise, the instructions we can generate depend on the }
{ operation }
useReg := false;
case op of
OP_DIV, OP_IDIV, OP_IMUL, OP_MUL:
if (Op = OP_IMUL) and (longint(a) >= -32768) and
(longint(a) <= 32767) then
list.concat(taicpu.op_reg_reg_const(A_MULLI,dst,src,a))
else
usereg := true;
OP_ADD,OP_SUB:
begin
list.concat(taicpu.op_reg_reg_const(oplo,dst,src,low(a)));
list.concat(taicpu.op_reg_reg_const(ophi,dst,dst,
high(a) + ord(smallint(a) < 0)));
end;
OP_OR:
{ try to use rlwimi }
if get_rlwi_const(a,l1,l2) then
begin
if src <> dst then
list.concat(taicpu.op_reg_reg(A_MR,dst,src));
scratchreg := get_scratch_reg_int(list);
list.concat(taicpu.op_reg_const(A_LI,scratchreg,-1));
list.concat(taicpu.op_reg_reg_const_const_const(A_RLWIMI,dst,
scratchreg,0,l1,l2));
free_scratch_reg(list,scratchreg);
end
else
useReg := true;
OP_AND:
{ try to use rlwinm }
if get_rlwi_const(a,l1,l2) then
list.concat(taicpu.op_reg_reg_const_const_const(A_RLWINM,dst,
src,0,l1,l2))
else
useReg := true;
OP_XOR:
useReg := true;
OP_SHL,OP_SHR,OP_SAR:
begin
if (a and 31) <> 0 Then
list.concat(taicpu.op_reg_reg_const(
TOpCG2AsmOpConstLo[Op],dst,src,a and 31));
if (a shr 5) <> 0 then
internalError(68991);
end
else
internalerror(200109091);
end;
{ if all else failed, load the constant in a register and then }
{ perform the operation }
if useReg then
begin
scratchreg := get_scratch_reg_int(list);
a_load_const_reg(list,OS_32,a,scratchreg);
a_op_reg_reg_reg(list,op,OS_32,scratchreg,src,dst);
free_scratch_reg(list,scratchreg);
end;
end;
procedure tcgppc.a_op_reg_reg_reg(list: taasmoutput; op: TOpCg;
size: tcgsize; src1, src2, dst: tregister);
const
op_reg_reg_opcg2asmop: array[TOpCG] of tasmop =
(A_NONE,A_ADD,A_AND,A_DIVWU,A_DIVW,A_MULLW,A_MULLW,A_NEG,A_NOT,A_OR,
A_SRAW,A_SLW,A_SRW,A_SUB,A_XOR);
begin
case op of
OP_NEG,OP_NOT:
list.concat(taicpu.op_reg_reg(op_reg_reg_opcg2asmop[op],dst,dst));
else
list.concat(taicpu.op_reg_reg_reg(op_reg_reg_opcg2asmop[op],dst,src2,src1));
end;
end;
{*************** compare instructructions ****************}
procedure tcgppc.a_cmp_const_reg_label(list : taasmoutput;size : tcgsize;cmp_op : topcmp;a : aword;reg : tregister;
l : tasmlabel);
var
p: taicpu;
scratch_register: TRegister;
signed: boolean;
begin
signed := cmp_op in [OC_GT,OC_LT,OC_GTE,OC_LTE];
{ in the following case, we generate more efficient code when }
{ signed is true }
if (cmp_op in [OC_EQ,OC_NE]) and
(a > $ffff) then
signed := true;
if signed then
if (longint(a) >= low(smallint)) and (longint(a) <= high(smallint)) Then
list.concat(taicpu.op_reg_reg_const(A_CMPWI,R_CR0,reg,longint(a)))
else
begin
scratch_register := get_scratch_reg_int(list);
a_load_const_reg(list,OS_32,a,scratch_register);
list.concat(taicpu.op_reg_reg_reg(A_CMPW,R_CR0,reg,scratch_register));
free_scratch_reg(list,scratch_register);
end
else
if (a <= $ffff) then
list.concat(taicpu.op_reg_reg_const(A_CMPLWI,R_CR0,reg,a))
else
begin
scratch_register := get_scratch_reg_int(list);
a_load_const_reg(list,OS_32,a,scratch_register);
list.concat(taicpu.op_reg_reg_reg(A_CMPLW,R_CR0,reg,scratch_register));
free_scratch_reg(list,scratch_register);
end;
a_jmp(list,A_BC,TOpCmp2AsmCond[cmp_op],0,l);
end;
procedure tcgppc.a_cmp_reg_reg_label(list : taasmoutput;size : tcgsize;cmp_op : topcmp;
reg1,reg2 : tregister;l : tasmlabel);
var
p: taicpu;
op: tasmop;
begin
if cmp_op in [OC_GT,OC_LT,OC_GTE,OC_LTE] then
op := A_CMPW
else op := A_CMPLW;
list.concat(taicpu.op_reg_reg_reg(op,R_CR0,reg1,reg2));
a_jmp(list,A_BC,TOpCmp2AsmCond[cmp_op],0,l);
end;
procedure tcgppc.a_jmp_cond(list : taasmoutput;cond : TOpCmp;l: tasmlabel);
begin
a_jmp(list,A_BC,TOpCmp2AsmCond[cond],0,l);
end;
procedure tcgppc.a_jmp_always(list : taasmoutput;l: tasmlabel);
begin
a_jmp(list,A_B,C_None,0,l);
end;
procedure tcgppc.a_jmp_flags(list : taasmoutput;const f : TResFlags;l: tasmlabel);
var
c: tasmcond;
begin
c := flags_to_cond(f);
a_jmp(list,A_BC,c.cond,ord(c.cr)-ord(R_CR0),l);
end;
procedure tcgppc.g_flags2reg(list: taasmoutput; const f: TResFlags; reg: TRegister);
var
testbit: byte;
bitvalue: boolean;
begin
{ get the bit to extract from the conditional register + its }
{ requested value (0 or 1) }
testbit := (ord(f.cr) * 4);
case f.flag of
F_EQ,F_NE:
bitvalue := f.flag = F_EQ;
F_LT,F_GE:
begin
inc(testbit);
bitvalue := f.flag = F_LT;
end;
F_GT,F_LE:
begin
inc(testbit,2);
bitvalue := f.flag = F_GT;
end;
else
internalerror(200112261);
end;
{ load the conditional register in the destination reg }
list.concat(taicpu.op_reg(A_MFCR,reg));
{ we will move the bit that has to be tested to bit 31 -> rotate }
{ left by bitpos+1 (remember, this is big-endian!) }
testbit := (testbit + 1) and 31;
{ extract bit }
list.concat(taicpu.op_reg_reg_const_const_const(
A_RLWINM,reg,reg,testbit,31,31));
{ if we need the inverse, xor with 1 }
if not bitvalue then
list.concat(taicpu.op_reg_reg_const(A_XORI,reg,reg,1));
end;
(*
procedure tcgppc.g_cond2reg(list: taasmoutput; const f: TAsmCond; reg: TRegister);
var
testbit: byte;
bitvalue: boolean;
begin
{ get the bit to extract from the conditional register + its }
{ requested value (0 or 1) }
case f.simple of
false:
begin
{ we don't generate this in the compiler }
internalerror(200109062);
end;
true:
case f.cond of
C_None:
internalerror(200109063);
C_LT..C_NU:
begin
testbit := (ord(f.cr) - ord(R_CR0))*4;
inc(testbit,AsmCondFlag2BI[f.cond]);
bitvalue := AsmCondFlagTF[f.cond];
end;
C_T,C_F,C_DNZT,C_DNZF,C_DZT,C_DZF:
begin
testbit := f.crbit
bitvalue := AsmCondFlagTF[f.cond];
end;
else
internalerror(200109064);
end;
end;
{ load the conditional register in the destination reg }
list.concat(taicpu.op_reg_reg(A_MFCR,reg));
{ we will move the bit that has to be tested to bit 31 -> rotate }
{ left by bitpos+1 (remember, this is big-endian!) }
if bitpos <> 31 then
inc(bitpos)
else
bitpos := 0;
{ extract bit }
list.concat(taicpu.op_reg_reg_const_const_const(
A_RLWINM,reg,reg,bitpos,31,31));
{ if we need the inverse, xor with 1 }
if not bitvalue then
list.concat(taicpu.op_reg_reg_const(A_XORI,reg,reg,1));
end;
*)
{ *********** entry/exit code and address loading ************ }
procedure tcgppc.g_stackframe_entry(list : taasmoutput;localsize : longint);
begin
case target_info.target of
target_powerpc_macos:
g_stackframe_entry_mac(list,localsize);
target_powerpc_linux:
g_stackframe_entry_sysv(list,localsize)
else
internalerror(2204001);
end;
end;
procedure tcgppc.g_stackframe_entry_sysv(list : taasmoutput;localsize : longint);
{ generated the entry code of a procedure/function. Note: localsize is the }
{ sum of the size necessary for local variables and the maximum possible }
{ combined size of ALL the parameters of a procedure called by the current }
{ one }
var regcounter: TRegister;
href : treference;
begin
if (localsize mod 8) <> 0 then internalerror(58991);
{ CR and LR only have to be saved in case they are modified by the current }
{ procedure, but currently this isn't checked, so save them always }
{ following is the entry code as described in "Altivec Programming }
{ Interface Manual", bar the saving of AltiVec registers }
a_reg_alloc(list,STACK_POINTER_REG);
a_reg_alloc(list,R_0);
{ allocate registers containing reg parameters }
for regcounter := R_3 to R_10 do
a_reg_alloc(list,regcounter);
{ save return address... }
list.concat(taicpu.op_reg_reg(A_MFSPR,R_0,R_LR));
{ ... in caller's frame }
reference_reset_base(href,STACK_POINTER_REG,4);
list.concat(taicpu.op_reg_ref(A_STW,R_0,href));
a_reg_dealloc(list,R_0);
a_reg_alloc(list,R_11);
{ save end of fpr save area }
list.concat(taicpu.op_reg_reg_const(A_ORI,R_11,STACK_POINTER_REG,0));
a_reg_alloc(list,R_12);
{ 0 or 8 based on SP alignment }
list.concat(taicpu.op_reg_reg_const_const_const(A_RLWINM,
R_12,STACK_POINTER_REG,0,28,28));
{ add in stack length }
list.concat(taicpu.op_reg_reg_const(A_SUBFIC,R_12,R_12,
-localsize));
{ establish new alignment }
list.concat(taicpu.op_reg_reg_reg(A_STWUX,STACK_POINTER_REG,STACK_POINTER_REG,R_12));
a_reg_dealloc(list,R_12);
{ save floating-point registers }
{ !!! has to be optimized: only save registers that are used }
list.concat(taicpu.op_sym_ofs(A_BL,newasmsymbol('_savefpr_14'),0));
{ compute end of gpr save area }
list.concat(taicpu.op_reg_reg_const(A_ADDI,R_11,R_11,-144));
{ save gprs and fetch GOT pointer }
{ !!! has to be optimized: only save registers that are used }
list.concat(taicpu.op_sym_ofs(A_BL,newasmsymbol('_savegpr_14_go'),0));
a_reg_alloc(list,R_31);
{ place GOT ptr in r31 }
list.concat(taicpu.op_reg_reg(A_MFSPR,R_31,R_LR));
{ save the CR if necessary ( !!! always done currently ) }
{ still need to find out where this has to be done for SystemV
a_reg_alloc(list,R_0);
list.concat(taicpu.op_reg_reg(A_MFSPR,R_0,R_CR);
list.concat(taicpu.op_reg_ref(A_STW,scratch_register,
new_reference(STACK_POINTER_REG,LA_CR)));
a_reg_dealloc(list,R_0); }
{ save pointer to incoming arguments }
list.concat(taicpu.op_reg_reg_const(A_ADDI,R_30,R_11,144));
{ now comes the AltiVec context save, not yet implemented !!! }
end;
procedure tcgppc.g_stackframe_entry_mac(list : taasmoutput;localsize : longint);
{ generated the entry code of a procedure/function. Note: localsize is the }
{ sum of the size necessary for local variables and the maximum possible }
{ combined size of ALL the parameters of a procedure called by the current }
{ one }
var regcounter: TRegister;
href : treference;
begin
if (localsize mod 8) <> 0 then internalerror(58991);
{ CR and LR only have to be saved in case they are modified by the current }
{ procedure, but currently this isn't checked, so save them always }
{ following is the entry code as described in "Altivec Programming }
{ Interface Manual", bar the saving of AltiVec registers }
a_reg_alloc(list,STACK_POINTER_REG);
a_reg_alloc(list,R_0);
{ allocate registers containing reg parameters }
for regcounter := R_3 to R_10 do
a_reg_alloc(list,regcounter);
{ save return address... }
list.concat(taicpu.op_reg_reg(A_MFSPR,R_0,R_LR));
{ ... in caller's frame }
reference_reset_base(href,STACK_POINTER_REG,8);
list.concat(taicpu.op_reg_ref(A_STW,R_0,href));
a_reg_dealloc(list,R_0);
{ save floating-point registers }
{ !!! has to be optimized: only save registers that are used }
list.concat(taicpu.op_sym_ofs(A_BL,newasmsymbol('_savef14'),0));
{ save gprs in gpr save area }
{ !!! has to be optimized: only save registers that are used }
reference_reset_base(href,STACK_POINTER_REG,-220);
list.concat(taicpu.op_reg_ref(A_STMW,R_13,href));
{ save the CR if necessary ( !!! always done currently ) }
a_reg_alloc(list,R_0);
list.concat(taicpu.op_reg_reg(A_MFSPR,R_0,R_CR));
reference_reset_base(href,stack_pointer_reg,LA_CR);
list.concat(taicpu.op_reg_ref(A_STW,R_0,href));
a_reg_dealloc(list,R_0);
{ save pointer to incoming arguments }
list.concat(taicpu.op_reg_reg_const(A_ORI,R_31,STACK_POINTER_REG,0));
a_reg_alloc(list,R_12);
{ 0 or 8 based on SP alignment }
list.concat(taicpu.op_reg_reg_const_const_const(A_RLWINM,
R_12,STACK_POINTER_REG,0,28,28));
{ add in stack length }
list.concat(taicpu.op_reg_reg_const(A_SUBFIC,R_12,R_12,
-localsize));
{ establish new alignment }
list.concat(taicpu.op_reg_reg_reg(A_STWUX,STACK_POINTER_REG,STACK_POINTER_REG,R_12));
a_reg_dealloc(list,R_12);
{ now comes the AltiVec context save, not yet implemented !!! }
end;
procedure tcgppc.g_restore_frame_pointer(list : taasmoutput);
begin
{ no frame pointer on the PowerPC (maybe there is one in the SystemV ABI?)}
end;
procedure tcgppc.g_return_from_proc(list : taasmoutput;parasize : aword);
begin
case target_info.target of
target_powerpc_macos:
g_return_from_proc_mac(list,parasize);
target_powerpc_linux:
g_return_from_proc_sysv(list,parasize)
else
internalerror(2204001);
end;
end;
procedure tcgppc.a_loadaddr_ref_reg(list : taasmoutput;const ref : treference;r : tregister);
var tmpreg: tregister;
ref2, tmpref: treference;
begin
ref2 := ref;
FixRef(list,ref2);
if assigned(ref2.symbol) then
{ add the symbol's value to the base of the reference, and if the }
{ reference doesn't have a base, create one }
begin
tmpreg := get_scratch_reg_address(list);
reference_reset(tmpref);
tmpref.symbol := ref2.symbol;
tmpref.symaddr := refs_ha;
// tmpref.is_immediate := true;
if ref2.base <> R_NO then
list.concat(taicpu.op_reg_reg_ref(A_ADDIS,tmpreg,
ref2.base,tmpref))
else
list.concat(taicpu.op_reg_ref(A_LIS,tmpreg,tmpref));
tmpref.base := tmpreg;
tmpref.symaddr := refs_l;
{ can be folded with one of the next instructions by the }
{ optimizer probably }
list.concat(taicpu.op_reg_reg_ref(A_ADDI,tmpreg,tmpreg,tmpref));
end;
if ref2.offset <> 0 Then
if ref2.base <> R_NO then
a_op_const_reg_reg(list,OP_ADD,OS_32,ref2.offset,ref2.base,r)
{ FixRef makes sure that "(ref.index <> R_NO) and (ref.offset <> 0)" never}
{ occurs, so now only ref.offset has to be loaded }
else a_load_const_reg(list,OS_32,ref2.offset,r)
else
if ref.index <> R_NO Then
list.concat(taicpu.op_reg_reg_reg(A_ADD,r,ref2.base,ref2.index))
else
if r <> ref2.base then
list.concat(taicpu.op_reg_reg(A_MR,r,ref2.base));
if assigned(ref2.symbol) then
free_scratch_reg(list,tmpreg);
end;
{ ************* concatcopy ************ }
procedure tcgppc.g_concatcopy(list : taasmoutput;const source,dest : treference;len : aword; delsource,loadref : boolean);
var
t: taicpu;
countreg, tempreg: TRegister;
src, dst: TReference;
lab: tasmlabel;
count, count2: aword;
begin
{ make sure short loads are handled as optimally as possible }
if not loadref then
if (len <= 4) and
(byte(len) in [1,2,4]) then
begin
a_load_ref_ref(list,int_cgsize(len),source,dest);
if delsource then
reference_release(exprasmlist,source);
exit;
end;
{ make sure source and dest are valid }
src := source;
fixref(list,src);
dst := dest;
fixref(list,dst);
reference_reset(src);
reference_reset(dst);
{ load the address of source into src.base }
src.base := get_scratch_reg_address(list);
if loadref then
a_load_ref_reg(list,OS_32,source,src.base)
else a_loadaddr_ref_reg(list,source,src.base);
if delsource then
reference_release(exprasmlist,source);
{ load the address of dest into dst.base }
dst.base := get_scratch_reg_address(list);
a_loadaddr_ref_reg(list,dest,dst.base);
count := len div 4;
if count > 3 then
{ generate a loop }
begin
{ the offsets are zero after the a_loadaddress_ref_reg and just }
{ have to be set to 4. I put an Inc there so debugging may be }
{ easier (should offset be different from zero here, it will be }
{ easy to notice in the generated assembler }
inc(dst.offset,4);
inc(src.offset,4);
list.concat(taicpu.op_reg_reg_const(A_SUBI,src.base,src.base,4));
list.concat(taicpu.op_reg_reg_const(A_SUBI,dst.base,dst.base,4));
countreg := get_scratch_reg_int(list);
a_load_const_reg(list,OS_32,count-1,countreg);
{ explicitely allocate R_0 since it can be used safely here }
{ (for holding date that's being copied) }
tempreg := R_0;
a_reg_alloc(list,R_0);
getlabel(lab);
a_label(list, lab);
list.concat(taicpu.op_reg_ref(A_LWZU,tempreg,src));
list.concat(taicpu.op_reg_reg_const(A_CMPWI,R_CR0,countreg,0));
list.concat(taicpu.op_reg_ref(A_STWU,tempreg,dst));
list.concat(taicpu.op_reg_reg_const(A_SUBI,countreg,countreg,1));
a_jmp(list,A_BC,C_NE,0,lab);
free_scratch_reg(list,countreg);
a_reg_dealloc(list,R_0);
end
else
{ unrolled loop }
begin
a_reg_alloc(list,R_0);
for count2 := 1 to count do
begin
a_load_ref_reg(list,OS_32,src,R_0);
a_load_reg_ref(list,OS_32,R_0,dst);
inc(src.offset,4);
inc(dst.offset,4);
end;
a_reg_dealloc(list,R_0);
end;
{ copy the leftovers }
if (len and 2) <> 0 then
begin
a_reg_alloc(list,R_0);
a_load_ref_reg(list,OS_16,src,R_0);
a_load_reg_ref(list,OS_16,R_0,dst);
inc(src.offset,2);
inc(dst.offset,2);
a_reg_dealloc(list,R_0);
end;
if (len and 1) <> 0 then
begin
a_load_reg_ref(list,OS_16,R_0,dst);
a_load_ref_reg(list,OS_8,src,R_0);
a_load_reg_ref(list,OS_8,R_0,dst);
a_reg_dealloc(list,R_0);
end;
free_scratch_reg(list,src.base);
free_scratch_reg(list,dst.base);
end;
procedure tcgppc.g_overflowcheck(list: taasmoutput; const p: tnode);
var
hl : tasmlabel;
begin
if not(cs_check_overflow in aktlocalswitches) then
exit;
getlabel(hl);
if not ((p.resulttype.def.deftype=pointerdef) or
((p.resulttype.def.deftype=orddef) and
(torddef(p.resulttype.def).typ in [u64bit,u16bit,u32bit,u8bit,uchar,
bool8bit,bool16bit,bool32bit]))) then
begin
list.concat(taicpu.op_reg(A_MCRXR,R_CR7));
a_jmp(list,A_BC,C_OV,7,hl)
end
else
a_jmp_cond(list,OC_AE,hl);
a_call_name(list,'FPC_OVERFLOW');
a_label(list,hl);
end;
{***************** This is private property, keep out! :) *****************}
procedure tcgppc.g_return_from_proc_sysv(list : taasmoutput;parasize : aword);
var
regcounter: TRegister;
begin
{ release parameter registers }
for regcounter := R_3 to R_10 do
a_reg_dealloc(list,regcounter);
{ AltiVec context restore, not yet implemented !!! }
{ address of gpr save area to r11 }
list.concat(taicpu.op_reg_reg_const(A_ADDI,R_11,R_31,-144));
{ restore gprs }
list.concat(taicpu.op_sym_ofs(A_BL,newasmsymbol('_restgpr_14'),0));
{ address of fpr save area to r11 }
list.concat(taicpu.op_reg_reg_const(A_ADDI,R_11,R_11,144));
{ restore fprs and return }
list.concat(taicpu.op_sym_ofs(A_BL,newasmsymbol('_restfpr_14_x'),0));
end;
procedure tcgppc.g_return_from_proc_mac(list : taasmoutput;parasize : aword);
var
regcounter: TRegister;
href : treference;
begin
{ release parameter registers }
for regcounter := R_3 to R_10 do
a_reg_dealloc(list,regcounter);
{ AltiVec context restore, not yet implemented !!! }
{ restore SP }
list.concat(taicpu.op_reg_reg_const(A_ORI,STACK_POINTER_REG,R_31,0));
{ restore gprs }
reference_reset_base(href,STACK_POINTER_REG,-220);
list.concat(taicpu.op_reg_ref(A_LMW,R_13,href));
{ restore return address ... }
reference_reset_base(href,STACK_POINTER_REG,8);
list.concat(taicpu.op_reg_ref(A_LWZ,R_0,href));
{ ... and return from _restf14 }
list.concat(taicpu.op_sym_ofs(A_B,newasmsymbol('_restf14'),0));
end;
procedure tcgppc.fixref(list: taasmoutput; var ref: treference);
begin
If (ref.base <> R_NO) then
begin
if (ref.index <> R_NO) and
((ref.offset <> 0) or assigned(ref.symbol)) then
begin
if not assigned(ref.symbol) and
(cardinal(ref.offset-low(smallint)) <=
high(smallint)-low(smallint)) then
begin
list.concat(taicpu.op_reg_reg_const(
A_ADDI,ref.base,ref.base,ref.offset));
ref.offset := 0;
end
else
begin
list.concat(taicpu.op_reg_reg_reg(
A_ADD,ref.base,ref.base,ref.index));
ref.index := R_NO;
end;
end
end
else
begin
ref.base := ref.index;
ref.index := R_NO
end
end;
{ find out whether a is of the form 11..00..11b or 00..11...00. If }
{ that's the case, we can use rlwinm to do an AND operation }
function tcgppc.get_rlwi_const(a: longint; var l1, l2: longint): boolean;
var
temp, testbit: longint;
compare: boolean;
begin
get_rlwi_const := false;
{ start with the lowest bit }
testbit := 1;
{ check its value }
compare := boolean(a and testbit);
{ find out how long the run of bits with this value is }
{ (it's impossible that all bits are 1 or 0, because in that case }
{ this function wouldn't have been called) }
l1 := 31;
while (((a and testbit) <> 0) = compare) do
begin
testbit := testbit shl 1;
dec(l1);
end;
{ check the length of the run of bits that comes next }
compare := not compare;
l2 := l1;
while (((a and testbit) <> 0) = compare) and
(l2 >= 0) do
begin
testbit := testbit shl 1;
dec(l2);
end;
{ and finally the check whether the rest of the bits all have the }
{ same value }
compare := not compare;
temp := l2;
if temp >= 0 then
if (a shr (31-temp)) <> ((-ord(compare)) shr (31-temp)) then
exit;
{ we have done "not(not(compare))", so compare is back to its }
{ initial value. If the lowest bit was 0, a is of the form }
{ 00..11..00 and we need "rlwinm reg,reg,0,l2+1,l1", (+1 }
{ because l2 now contains the position of the last zero of the }
{ first run instead of that of the first 1) so switch l1 and l2 }
{ in that case (we will generate "rlwinm reg,reg,0,l1,l2") }
if not compare then
begin
temp := l1;
l1 := l2+1;
l2 := temp;
end
else
{ otherwise, l1 currently contains the position of the last }
{ zero instead of that of the first 1 of the second run -> +1 }
inc(l1);
{ the following is the same as "if l1 = -1 then l1 := 31;" }
l1 := l1 and 31;
l2 := l2 and 31;
get_rlwi_const := true;
end;
procedure tcgppc.a_load_store(list:taasmoutput;op: tasmop;reg:tregister;
ref: treference);
var
tmpreg: tregister;
tmpref: treference;
begin
if assigned(ref.symbol) then
begin
tmpreg := get_scratch_reg_address(list);
reference_reset(tmpref);
tmpref.symbol := ref.symbol;
tmpref.symaddr := refs_ha;
// tmpref.is_immediate := true;
if ref.base <> R_NO then
list.concat(taicpu.op_reg_reg_ref(A_ADDIS,tmpreg,
ref.base,tmpref))
else
list.concat(taicpu.op_reg_ref(A_LIS,tmpreg,tmpref));
ref.base := tmpreg;
ref.symaddr := refs_l;
end;
list.concat(taicpu.op_reg_ref(op,reg,ref));
if assigned(ref.symbol) then
free_scratch_reg(list,tmpreg);
end;
procedure tcgppc.a_jmp(list: taasmoutput; op: tasmop; c: tasmcondflag;
crval: longint; l: tasmlabel);
var
p: taicpu;
begin
p := taicpu.op_sym(op,newasmsymbol(l.name));
if op <> A_B then
create_cond_norm(c,crval,p.condition);
p.is_jmp := true;
list.concat(p)
end;
procedure tcg64fppc.a_op64_reg_reg(list : taasmoutput;op:TOpCG;regsrc,regdst : tregister64);
begin
case op of
OP_AND,OP_OR,OP_XOR:
begin
cg.a_op_reg_reg(list,op,OS_32,regsrc.reglo,regdst.reglo);
cg.a_op_reg_reg(list,op,OS_32,regsrc.reghi,regdst.reghi);
end;
OP_ADD:
begin
list.concat(taicpu.op_reg_reg_reg(A_ADDC,regdst.reglo,regsrc.reglo,regdst.reglo));
list.concat(taicpu.op_reg_reg_reg(A_ADDE,regdst.reghi,regsrc.reghi,regdst.reghi));
end;
OP_SUB:
begin
list.concat(taicpu.op_reg_reg_reg(A_SUBC,regdst.reglo,regdst.reglo,regsrc.reglo));
list.concat(taicpu.op_reg_reg_reg(A_SUBFE,regdst.reghi,regsrc.reghi,regdst.reghi));
end;
end;
end;
procedure tcg64fppc.a_op64_const_reg(list : taasmoutput;op:TOpCG;value : qword;reg : tregister64);
const
ops: array[boolean,1..3] of tasmop = ((A_ADDIC,A_ADDC,A_ADDZE),
(A_SUBIC,A_SUBC,A_ADDME));
var
tmpreg: tregister;
tmpreg64: tregister64;
isadd: boolean;
begin
case op of
OP_AND,OP_OR,OP_XOR:
begin
cg.a_op_const_reg(list,op,cardinal(value),reg.reglo);
cg.a_op_const_reg(list,op,value shr 32,reg.reghi);
end;
OP_ADD, OP_SUB:
begin
if (longint(value) <> 0) then
begin
isadd := op = OP_ADD;
if (longint(value) >= -32768) and
(longint(value) <= 32767) then
begin
list.concat(taicpu.op_reg_reg_const(ops[isadd,1],
reg.reglo,reg.reglo,aword(value)));
end
else if ((value shr 32) = 0) then
begin
tmpreg := cg.get_scratch_reg_int(list);
cg.a_load_const_reg(list,OS_32,cardinal(value),tmpreg);
list.concat(taicpu.op_reg_reg_reg(ops[isadd,2],
reg.reglo,reg.reglo,tmpreg));
list.concat(taicpu.op_reg_reg(ops[isadd,3],
reg.reghi,reg.reghi));
cg.free_scratch_reg(list,tmpreg);
end
else
begin
tmpreg64.reglo := cg.get_scratch_reg_int(list);
tmpreg64.reghi := cg.get_scratch_reg_int(list);
a_load64_const_reg(list,value,tmpreg64);
a_op64_reg_reg(list,op,tmpreg64,reg);
cg.free_scratch_reg(list,tmpreg64.reghi);
cg.free_scratch_reg(list,tmpreg64.reglo);
end
end
else
cg.a_op_const_reg(list,op,value shr 32,reg.reghi);
end;
end;
end;
begin
cg := tcgppc.create;
cg64 :=tcg64fppc.create;
end.
{
$Log$
Revision 1.23 2002-07-11 14:41:34 florian
* start of the new generic parameter handling
Revision 1.22 2002/07/11 07:38:28 jonas
+ tcg64fpc implementation (only a_op64_reg_reg and a_op64_const_reg for
now)
* fixed and improved tcgppc.a_load_const_reg
* improved tcgppc.a_op_const_reg, tcgppc.a_cmp_const_reg_label
* A_CMP* -> A_CMPW* (this means that 32bit compares should be done)
Revision 1.21 2002/07/09 19:45:01 jonas
* unarynminus and shlshr node fixed for 32bit and smaller ordinals
* small fixes in the assembler writer
* changed scratch registers, because they were used by the linker (r11
and r12) and by the abi under linux (r31)
Revision 1.20 2002/07/07 09:44:31 florian
* powerpc target fixed, very simple units can be compiled
Revision 1.19 2002/05/20 13:30:41 carl
* bugfix of hdisponen (base must be set, not index)
* more portability fixes
Revision 1.18 2002/05/18 13:34:26 peter
* readded missing revisions
Revision 1.17 2002/05/16 19:46:53 carl
+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
+ try to fix temp allocation (still in ifdef)
+ generic constructor calls
+ start of tassembler / tmodulebase class cleanup
Revision 1.14 2002/05/13 19:52:46 peter
* a ppcppc can be build again
Revision 1.13 2002/04/20 21:41:51 carl
* renamed some constants
Revision 1.12 2002/04/06 18:13:01 jonas
* several powerpc-related additions and fixes
Revision 1.11 2002/01/02 14:53:04 jonas
* fixed small bug in a_jmp_flags
}
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