1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
{
Copyright (c) 1998-2009 by Florian Klaempfl and David Zhang
This unit implements the register allocator for MIPS(EL)
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 rgcpu;
{$i fpcdefs.inc}
interface
uses
aasmbase,aasmcpu,aasmtai,aasmdata,
cgbase,cgutils,
cpubase,
rgobj;
type
trgcpu=class(trgobj)
procedure add_constraints(reg:tregister);override;
function get_spill_subreg(r : tregister) : tsubregister;override;
procedure do_spill_read(list:tasmlist;pos:tai;const spilltemp:treference;tempreg:tregister);override;
procedure do_spill_written(list:tasmlist;pos:tai;const spilltemp:treference;tempreg:tregister);override;
function do_spill_replace(list:TAsmList;instr:taicpu;orgreg:tsuperregister;const spilltemp:treference):boolean;override;
end;
trgintcpu=class(trgcpu)
procedure add_cpu_interferences(p:tai);override;
end;
implementation
uses
globtype,
verbose,cutils,
cgobj;
procedure trgcpu.add_constraints(reg:tregister);
var
supreg,i : Tsuperregister;
begin
case getsubreg(reg) of
{ Let 64bit floats conflict with all odd float regs }
R_SUBFD:
begin
supreg:=getsupreg(reg);
i:=RS_F1;
while (i<=RS_F31) do
begin
add_edge(supreg,i);
inc(i,2);
end;
end;
{ Let 64bit ints conflict with all odd int regs }
R_SUBQ:
begin
supreg:=getsupreg(reg);
i:=RS_R1;
while (i<=RS_R31) do
begin
add_edge(supreg,i);
inc(i,2);
end;
end;
end;
end;
function trgcpu.get_spill_subreg(r : tregister) : tsubregister;
begin
if getregtype(r)=R_FPUREGISTER then
result:=getsubreg(r)
else
result:=defaultsub;
end;
procedure trgcpu.do_spill_read(list:tasmlist;pos:tai;const spilltemp:treference;tempreg:tregister);
var
helpins : tai;
tmpref : treference;
helplist : tasmlist;
hreg : tregister;
begin
if abs(spilltemp.offset)>32767 then
begin
helplist:=tasmlist.create;
if getregtype(tempreg)=R_INTREGISTER then
hreg:=tempreg
else
hreg:=cg.getintregister(helplist,OS_ADDR);
helplist.concat(taicpu.op_reg_const(A_LUI,hreg,spilltemp.offset shr 16));
helplist.concat(taicpu.op_reg_reg_const(A_ORI,hreg,hreg,spilltemp.offset and $FFFF));
helplist.concat(taicpu.op_reg_reg_reg(A_ADDU,hreg,hreg,spilltemp.base));
reference_reset_base(tmpref,hreg,0,sizeof(aint));
helpins:=spilling_create_load(tmpref,tempreg);
helplist.concat(helpins);
list.insertlistafter(pos,helplist);
helplist.free;
end
else
inherited do_spill_read(list,pos,spilltemp,tempreg);
end;
procedure trgcpu.do_spill_written(list:tasmlist;pos:tai;const spilltemp:treference;tempreg:tregister);
var
tmpref : treference;
helplist : tasmlist;
hreg : tregister;
begin
if abs(spilltemp.offset)>32767 then
begin
helplist:=tasmlist.create;
if getregtype(tempreg)=R_INTREGISTER then
hreg:=getregisterinline(helplist,[R_SUBWHOLE])
else
hreg:=cg.getintregister(helplist,OS_ADDR);
helplist.concat(taicpu.op_reg_const(A_LUI,hreg,spilltemp.offset shr 16));
helplist.concat(taicpu.op_reg_reg_const(A_ORI,hreg,hreg,spilltemp.offset and $FFFF));
helplist.concat(taicpu.op_reg_reg_reg(A_ADDU,hreg,hreg,spilltemp.base));
reference_reset_base(tmpref,hreg,0,sizeof(aint));
helplist.concat(spilling_create_store(tempreg,tmpref));
if getregtype(tempreg)=R_INTREGISTER then
ungetregisterinline(helplist,hreg);
list.insertlistafter(pos,helplist);
helplist.free;
end
else
inherited do_spill_written(list,pos,spilltemp,tempreg);
end;
function trgcpu.do_spill_replace(list:TAsmList;instr:taicpu;orgreg:tsuperregister;const spilltemp:treference):boolean;
begin
result:=false;
{ Replace 'move orgreg,src' with 'sw src,spilltemp'
and 'move dst,orgreg' with 'lw dst,spilltemp' }
{ TODO: A_MOV_S and A_MOV_D for float registers are also replaceable }
if (instr.opcode<>A_MOVE) or (abs(spilltemp.offset)>32767) then
exit;
if (instr.ops<>2) or
(instr.oper[0]^.typ<>top_reg) or
(instr.oper[1]^.typ<>top_reg) or
(getregtype(instr.oper[0]^.reg)<>regtype) or
(getregtype(instr.oper[1]^.reg)<>regtype) then
InternalError(2013061001);
if get_alias(getsupreg(instr.oper[1]^.reg))=orgreg then
begin
instr.opcode:=A_LW;
end
else if get_alias(getsupreg(instr.oper[0]^.reg))=orgreg then
begin
instr.opcode:=A_SW;
instr.oper[0]^:=instr.oper[1]^;
end
else
InternalError(2013061002);
instr.oper[1]^.typ:=top_ref;
new(instr.oper[1]^.ref);
instr.oper[1]^.ref^:=spilltemp;
result:=true;
end;
procedure trgintcpu.add_cpu_interferences(p: tai);
var
supreg: tsuperregister;
begin
if p.typ<>ait_instruction then
exit;
if (taicpu(p).ops>=1) and (taicpu(p).oper[0]^.typ=top_reg) and
(getregtype(taicpu(p).oper[0]^.reg)=regtype) and
(taicpu(p).spilling_get_operation_type(0) in [operand_write,operand_readwrite]) then
begin
{ prevent merging registers with frame/stack pointer, $zero and $at
if an instruction writes to the register }
supreg:=getsupreg(taicpu(p).oper[0]^.reg);
add_edge(supreg,RS_STACK_POINTER_REG);
add_edge(supreg,RS_FRAME_POINTER_REG);
add_edge(supreg,RS_R0);
add_edge(supreg,RS_R1);
end;
end;
end.
|
