|
83
|
1 //===-------------- PPCVSXCopy.cpp - VSX Copy Legalization ----------------===//
|
|
|
2 //
|
|
|
3 // The LLVM Compiler Infrastructure
|
|
|
4 //
|
|
|
5 // This file is distributed under the University of Illinois Open Source
|
|
|
6 // License. See LICENSE.TXT for details.
|
|
|
7 //
|
|
|
8 //===----------------------------------------------------------------------===//
|
|
|
9 //
|
|
|
10 // A pass which deals with the complexity of generating legal VSX register
|
|
|
11 // copies to/from register classes which partially overlap with the VSX
|
|
|
12 // register file.
|
|
|
13 //
|
|
|
14 //===----------------------------------------------------------------------===//
|
|
|
15
|
|
120
|
16 #include "PPC.h"
|
|
83
|
17 #include "MCTargetDesc/PPCPredicates.h"
|
|
|
18 #include "PPCHazardRecognizers.h"
|
|
|
19 #include "PPCInstrBuilder.h"
|
|
120
|
20 #include "PPCInstrInfo.h"
|
|
83
|
21 #include "PPCMachineFunctionInfo.h"
|
|
|
22 #include "PPCTargetMachine.h"
|
|
|
23 #include "llvm/ADT/STLExtras.h"
|
|
|
24 #include "llvm/ADT/Statistic.h"
|
|
|
25 #include "llvm/CodeGen/MachineFrameInfo.h"
|
|
|
26 #include "llvm/CodeGen/MachineFunctionPass.h"
|
|
|
27 #include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
|
28 #include "llvm/CodeGen/MachineMemOperand.h"
|
|
|
29 #include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
|
30 #include "llvm/MC/MCAsmInfo.h"
|
|
|
31 #include "llvm/Support/Debug.h"
|
|
|
32 #include "llvm/Support/ErrorHandling.h"
|
|
|
33 #include "llvm/Support/TargetRegistry.h"
|
|
|
34 #include "llvm/Support/raw_ostream.h"
|
|
|
35
|
|
|
36 using namespace llvm;
|
|
|
37
|
|
|
38 #define DEBUG_TYPE "ppc-vsx-copy"
|
|
|
39
|
|
|
40 namespace llvm {
|
|
|
41 void initializePPCVSXCopyPass(PassRegistry&);
|
|
|
42 }
|
|
|
43
|
|
|
44 namespace {
|
|
|
45 // PPCVSXCopy pass - For copies between VSX registers and non-VSX registers
|
|
|
46 // (Altivec and scalar floating-point registers), we need to transform the
|
|
|
47 // copies into subregister copies with other restrictions.
|
|
|
48 struct PPCVSXCopy : public MachineFunctionPass {
|
|
|
49 static char ID;
|
|
|
50 PPCVSXCopy() : MachineFunctionPass(ID) {
|
|
|
51 initializePPCVSXCopyPass(*PassRegistry::getPassRegistry());
|
|
|
52 }
|
|
|
53
|
|
|
54 const TargetInstrInfo *TII;
|
|
|
55
|
|
|
56 bool IsRegInClass(unsigned Reg, const TargetRegisterClass *RC,
|
|
|
57 MachineRegisterInfo &MRI) {
|
|
|
58 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
|
|
|
59 return RC->hasSubClassEq(MRI.getRegClass(Reg));
|
|
|
60 } else if (RC->contains(Reg)) {
|
|
|
61 return true;
|
|
|
62 }
|
|
|
63
|
|
|
64 return false;
|
|
|
65 }
|
|
|
66
|
|
|
67 bool IsVSReg(unsigned Reg, MachineRegisterInfo &MRI) {
|
|
|
68 return IsRegInClass(Reg, &PPC::VSRCRegClass, MRI);
|
|
|
69 }
|
|
|
70
|
|
|
71 bool IsVRReg(unsigned Reg, MachineRegisterInfo &MRI) {
|
|
|
72 return IsRegInClass(Reg, &PPC::VRRCRegClass, MRI);
|
|
|
73 }
|
|
|
74
|
|
|
75 bool IsF8Reg(unsigned Reg, MachineRegisterInfo &MRI) {
|
|
|
76 return IsRegInClass(Reg, &PPC::F8RCRegClass, MRI);
|
|
|
77 }
|
|
|
78
|
|
95
|
79 bool IsVSFReg(unsigned Reg, MachineRegisterInfo &MRI) {
|
|
|
80 return IsRegInClass(Reg, &PPC::VSFRCRegClass, MRI);
|
|
|
81 }
|
|
|
82
|
|
100
|
83 bool IsVSSReg(unsigned Reg, MachineRegisterInfo &MRI) {
|
|
|
84 return IsRegInClass(Reg, &PPC::VSSRCRegClass, MRI);
|
|
|
85 }
|
|
|
86
|
|
83
|
87 protected:
|
|
|
88 bool processBlock(MachineBasicBlock &MBB) {
|
|
|
89 bool Changed = false;
|
|
|
90
|
|
|
91 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
|
|
120
|
92 for (MachineInstr &MI : MBB) {
|
|
|
93 if (!MI.isFullCopy())
|
|
83
|
94 continue;
|
|
|
95
|
|
120
|
96 MachineOperand &DstMO = MI.getOperand(0);
|
|
|
97 MachineOperand &SrcMO = MI.getOperand(1);
|
|
83
|
98
|
|
|
99 if ( IsVSReg(DstMO.getReg(), MRI) &&
|
|
|
100 !IsVSReg(SrcMO.getReg(), MRI)) {
|
|
|
101 // This is a copy *to* a VSX register from a non-VSX register.
|
|
|
102 Changed = true;
|
|
|
103
|
|
120
|
104 const TargetRegisterClass *SrcRC = &PPC::VSLRCRegClass;
|
|
83
|
105 assert((IsF8Reg(SrcMO.getReg(), MRI) ||
|
|
100
|
106 IsVSSReg(SrcMO.getReg(), MRI) ||
|
|
95
|
107 IsVSFReg(SrcMO.getReg(), MRI)) &&
|
|
83
|
108 "Unknown source for a VSX copy");
|
|
|
109
|
|
|
110 unsigned NewVReg = MRI.createVirtualRegister(SrcRC);
|
|
120
|
111 BuildMI(MBB, MI, MI.getDebugLoc(),
|
|
83
|
112 TII->get(TargetOpcode::SUBREG_TO_REG), NewVReg)
|
|
120
|
113 .addImm(1) // add 1, not 0, because there is no implicit clearing
|
|
|
114 // of the high bits.
|
|
|
115 .addOperand(SrcMO)
|
|
|
116 .addImm(PPC::sub_64);
|
|
83
|
117
|
|
|
118 // The source of the original copy is now the new virtual register.
|
|
|
119 SrcMO.setReg(NewVReg);
|
|
|
120 } else if (!IsVSReg(DstMO.getReg(), MRI) &&
|
|
|
121 IsVSReg(SrcMO.getReg(), MRI)) {
|
|
|
122 // This is a copy *from* a VSX register to a non-VSX register.
|
|
|
123 Changed = true;
|
|
|
124
|
|
120
|
125 const TargetRegisterClass *DstRC = &PPC::VSLRCRegClass;
|
|
83
|
126 assert((IsF8Reg(DstMO.getReg(), MRI) ||
|
|
95
|
127 IsVSFReg(DstMO.getReg(), MRI) ||
|
|
120
|
128 IsVSSReg(DstMO.getReg(), MRI)) &&
|
|
83
|
129 "Unknown destination for a VSX copy");
|
|
|
130
|
|
|
131 // Copy the VSX value into a new VSX register of the correct subclass.
|
|
|
132 unsigned NewVReg = MRI.createVirtualRegister(DstRC);
|
|
120
|
133 BuildMI(MBB, MI, MI.getDebugLoc(), TII->get(TargetOpcode::COPY),
|
|
|
134 NewVReg)
|
|
|
135 .addOperand(SrcMO);
|
|
83
|
136
|
|
|
137 // Transform the original copy into a subregister extraction copy.
|
|
|
138 SrcMO.setReg(NewVReg);
|
|
120
|
139 SrcMO.setSubReg(PPC::sub_64);
|
|
83
|
140 }
|
|
|
141 }
|
|
|
142
|
|
|
143 return Changed;
|
|
|
144 }
|
|
|
145
|
|
|
146 public:
|
|
|
147 bool runOnMachineFunction(MachineFunction &MF) override {
|
|
|
148 // If we don't have VSX on the subtarget, don't do anything.
|
|
|
149 const PPCSubtarget &STI = MF.getSubtarget<PPCSubtarget>();
|
|
|
150 if (!STI.hasVSX())
|
|
|
151 return false;
|
|
|
152 TII = STI.getInstrInfo();
|
|
|
153
|
|
|
154 bool Changed = false;
|
|
|
155
|
|
|
156 for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
|
|
|
157 MachineBasicBlock &B = *I++;
|
|
|
158 if (processBlock(B))
|
|
|
159 Changed = true;
|
|
|
160 }
|
|
|
161
|
|
|
162 return Changed;
|
|
|
163 }
|
|
|
164
|
|
|
165 void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
|
166 MachineFunctionPass::getAnalysisUsage(AU);
|
|
|
167 }
|
|
|
168 };
|
|
|
169 }
|
|
|
170
|
|
|
171 INITIALIZE_PASS(PPCVSXCopy, DEBUG_TYPE,
|
|
|
172 "PowerPC VSX Copy Legalization", false, false)
|
|
|
173
|
|
|
174 char PPCVSXCopy::ID = 0;
|
|
|
175 FunctionPass*
|
|
|
176 llvm::createPPCVSXCopyPass() { return new PPCVSXCopy(); }
|
|
|
177
|
