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
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* This file contains Mips-specific register allocation support.
*/
#include "../../CompilerUtility.h"
#include "../../CompilerIR.h"
#include "../..//Dataflow.h"
#include "MipsLIR.h"
#include "Codegen.h"
#include "../Ralloc.h"
namespace art {
/*
* TUNING: is leaf? Can't just use "hasInvoke" to determine as some
* instructions might call out to C/assembly helper functions. Until
* machinery is in place, always spill lr.
*/
void oatAdjustSpillMask(CompilationUnit* cUnit)
{
cUnit->coreSpillMask |= (1 << r_RA);
cUnit->numCoreSpills++;
}
/*
* Mark a callee-save fp register as promoted. Note that
* vpush/vpop uses contiguous register lists so we must
* include any holes in the mask. Associate holes with
* Dalvik register INVALID_VREG (0xFFFFU).
*/
void oatMarkPreservedSingle(CompilationUnit* cUnit, int sReg, int reg)
{
LOG(FATAL) << "No support yet for promoted FP regs";
}
void oatFlushRegWide(CompilationUnit* cUnit, int reg1, int reg2)
{
RegisterInfo* info1 = oatGetRegInfo(cUnit, reg1);
RegisterInfo* info2 = oatGetRegInfo(cUnit, reg2);
DCHECK(info1 && info2 && info1->pair && info2->pair &&
(info1->partner == info2->reg) &&
(info2->partner == info1->reg));
if ((info1->live && info1->dirty) || (info2->live && info2->dirty)) {
if (!(info1->isTemp && info2->isTemp)) {
/* Should not happen. If it does, there's a problem in evalLoc */
LOG(FATAL) << "Long half-temp, half-promoted";
}
info1->dirty = false;
info2->dirty = false;
if (SRegToVReg(cUnit, info2->sReg) < SRegToVReg(cUnit, info1->sReg))
info1 = info2;
int vReg = SRegToVReg(cUnit, info1->sReg);
oatFlushRegWideImpl(cUnit, rSP, oatVRegOffset(cUnit, vReg), info1->reg,
info1->partner);
}
}
void oatFlushReg(CompilationUnit* cUnit, int reg)
{
RegisterInfo* info = oatGetRegInfo(cUnit, reg);
if (info->live && info->dirty) {
info->dirty = false;
int vReg = SRegToVReg(cUnit, info->sReg);
oatFlushRegImpl(cUnit, rSP, oatVRegOffset(cUnit, vReg), reg, kWord);
}
}
/* Give access to the target-dependent FP register encoding to common code */
bool oatIsFpReg(int reg) {
return FPREG(reg);
}
uint32_t oatFpRegMask() {
return FP_REG_MASK;
}
/* Clobber all regs that might be used by an external C call */
extern void oatClobberCalleeSave(CompilationUnit *cUnit)
{
oatClobber(cUnit, r_ZERO);
oatClobber(cUnit, r_AT);
oatClobber(cUnit, r_V0);
oatClobber(cUnit, r_V1);
oatClobber(cUnit, r_A0);
oatClobber(cUnit, r_A1);
oatClobber(cUnit, r_A2);
oatClobber(cUnit, r_A3);
oatClobber(cUnit, r_T0);
oatClobber(cUnit, r_T1);
oatClobber(cUnit, r_T2);
oatClobber(cUnit, r_T3);
oatClobber(cUnit, r_T4);
oatClobber(cUnit, r_T5);
oatClobber(cUnit, r_T6);
oatClobber(cUnit, r_T7);
oatClobber(cUnit, r_T8);
oatClobber(cUnit, r_T9);
oatClobber(cUnit, r_K0);
oatClobber(cUnit, r_K1);
oatClobber(cUnit, r_GP);
oatClobber(cUnit, r_FP);
oatClobber(cUnit, r_RA);
oatClobber(cUnit, r_F0);
oatClobber(cUnit, r_F1);
oatClobber(cUnit, r_F2);
oatClobber(cUnit, r_F3);
oatClobber(cUnit, r_F4);
oatClobber(cUnit, r_F5);
oatClobber(cUnit, r_F6);
oatClobber(cUnit, r_F7);
oatClobber(cUnit, r_F8);
oatClobber(cUnit, r_F9);
oatClobber(cUnit, r_F10);
oatClobber(cUnit, r_F11);
oatClobber(cUnit, r_F12);
oatClobber(cUnit, r_F13);
oatClobber(cUnit, r_F14);
oatClobber(cUnit, r_F15);
}
extern RegLocation oatGetReturnWideAlt(CompilationUnit* cUnit)
{
UNIMPLEMENTED(FATAL) << "No oatGetReturnWideAlt for MIPS";
RegLocation res = LOC_C_RETURN_WIDE;
return res;
}
extern RegLocation oatGetReturnAlt(CompilationUnit* cUnit)
{
UNIMPLEMENTED(FATAL) << "No oatGetReturnAlt for MIPS";
RegLocation res = LOC_C_RETURN;
return res;
}
extern RegisterInfo* oatGetRegInfo(CompilationUnit* cUnit, int reg)
{
return FPREG(reg) ? &cUnit->regPool->FPRegs[reg & FP_REG_MASK]
: &cUnit->regPool->coreRegs[reg];
}
/* To be used when explicitly managing register use */
extern void oatLockCallTemps(CompilationUnit* cUnit)
{
oatLockTemp(cUnit, rARG0);
oatLockTemp(cUnit, rARG1);
oatLockTemp(cUnit, rARG2);
oatLockTemp(cUnit, rARG3);
}
/* To be used when explicitly managing register use */
extern void oatFreeCallTemps(CompilationUnit* cUnit)
{
oatFreeTemp(cUnit, rARG0);
oatFreeTemp(cUnit, rARG1);
oatFreeTemp(cUnit, rARG2);
oatFreeTemp(cUnit, rARG3);
}
/* Convert an instruction to a NOP */
void oatNopLIR( LIR* lir)
{
((LIR*)lir)->flags.isNop = true;
}
} // namespace art
|