1 //===- R600MCCodeEmitter.cpp - Code Emitter for R600->Cayman GPU families -===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 /// \brief The R600 code emitter produces machine code that can be executed
13 /// directly on the GPU device.
15 //===----------------------------------------------------------------------===//
17 #include "R600Defines.h"
18 #include "MCTargetDesc/AMDGPUMCCodeEmitter.h"
19 #include "MCTargetDesc/AMDGPUMCTargetDesc.h"
20 #include "llvm/MC/MCCodeEmitter.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCInstrInfo.h"
24 #include "llvm/MC/MCRegisterInfo.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/Support/raw_ostream.h"
32 class R600MCCodeEmitter : public AMDGPUMCCodeEmitter {
33 R600MCCodeEmitter(const R600MCCodeEmitter &) = delete;
34 void operator=(const R600MCCodeEmitter &) = delete;
35 const MCInstrInfo &MCII;
36 const MCRegisterInfo &MRI;
40 R600MCCodeEmitter(const MCInstrInfo &mcii, const MCRegisterInfo &mri)
41 : MCII(mcii), MRI(mri) { }
43 /// \brief Encode the instruction and write it to the OS.
44 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
45 SmallVectorImpl<MCFixup> &Fixups,
46 const MCSubtargetInfo &STI) const override;
48 /// \returns the encoding for an MCOperand.
49 uint64_t getMachineOpValue(const MCInst &MI, const MCOperand &MO,
50 SmallVectorImpl<MCFixup> &Fixups,
51 const MCSubtargetInfo &STI) const override;
54 void EmitByte(unsigned int byte, raw_ostream &OS) const;
56 void Emit(uint32_t value, raw_ostream &OS) const;
57 void Emit(uint64_t value, raw_ostream &OS) const;
59 unsigned getHWRegChan(unsigned reg) const;
60 unsigned getHWReg(unsigned regNo) const;
64 } // End anonymous namespace
83 MCCodeEmitter *llvm::createR600MCCodeEmitter(const MCInstrInfo &MCII,
84 const MCRegisterInfo &MRI,
85 const MCSubtargetInfo &STI,
87 return new R600MCCodeEmitter(MCII, MRI);
90 void R600MCCodeEmitter::EncodeInstruction(const MCInst &MI, raw_ostream &OS,
91 SmallVectorImpl<MCFixup> &Fixups,
92 const MCSubtargetInfo &STI) const {
93 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
94 if (MI.getOpcode() == AMDGPU::RETURN ||
95 MI.getOpcode() == AMDGPU::FETCH_CLAUSE ||
96 MI.getOpcode() == AMDGPU::ALU_CLAUSE ||
97 MI.getOpcode() == AMDGPU::BUNDLE ||
98 MI.getOpcode() == AMDGPU::KILL) {
100 } else if (IS_VTX(Desc)) {
101 uint64_t InstWord01 = getBinaryCodeForInstr(MI, Fixups, STI);
102 uint32_t InstWord2 = MI.getOperand(2).getImm(); // Offset
103 if (!(STI.getFeatureBits() & AMDGPU::FeatureCaymanISA)) {
104 InstWord2 |= 1 << 19; // Mega-Fetch bit
107 Emit(InstWord01, OS);
109 Emit((uint32_t) 0, OS);
110 } else if (IS_TEX(Desc)) {
111 int64_t Sampler = MI.getOperand(14).getImm();
113 int64_t SrcSelect[4] = {
114 MI.getOperand(2).getImm(),
115 MI.getOperand(3).getImm(),
116 MI.getOperand(4).getImm(),
117 MI.getOperand(5).getImm()
119 int64_t Offsets[3] = {
120 MI.getOperand(6).getImm() & 0x1F,
121 MI.getOperand(7).getImm() & 0x1F,
122 MI.getOperand(8).getImm() & 0x1F
125 uint64_t Word01 = getBinaryCodeForInstr(MI, Fixups, STI);
126 uint32_t Word2 = Sampler << 15 | SrcSelect[ELEMENT_X] << 20 |
127 SrcSelect[ELEMENT_Y] << 23 | SrcSelect[ELEMENT_Z] << 26 |
128 SrcSelect[ELEMENT_W] << 29 | Offsets[0] << 0 | Offsets[1] << 5 |
133 Emit((uint32_t) 0, OS);
135 uint64_t Inst = getBinaryCodeForInstr(MI, Fixups, STI);
136 if ((STI.getFeatureBits() & AMDGPU::FeatureR600ALUInst) &&
137 ((Desc.TSFlags & R600_InstFlag::OP1) ||
138 Desc.TSFlags & R600_InstFlag::OP2)) {
139 uint64_t ISAOpCode = Inst & (0x3FFULL << 39);
140 Inst &= ~(0x3FFULL << 39);
141 Inst |= ISAOpCode << 1;
147 void R600MCCodeEmitter::EmitByte(unsigned int Byte, raw_ostream &OS) const {
148 OS.write((uint8_t) Byte & 0xff);
151 void R600MCCodeEmitter::Emit(uint32_t Value, raw_ostream &OS) const {
152 for (unsigned i = 0; i < 4; i++) {
153 OS.write((uint8_t) ((Value >> (8 * i)) & 0xff));
157 void R600MCCodeEmitter::Emit(uint64_t Value, raw_ostream &OS) const {
158 for (unsigned i = 0; i < 8; i++) {
159 EmitByte((Value >> (8 * i)) & 0xff, OS);
163 unsigned R600MCCodeEmitter::getHWRegChan(unsigned reg) const {
164 return MRI.getEncodingValue(reg) >> HW_CHAN_SHIFT;
167 unsigned R600MCCodeEmitter::getHWReg(unsigned RegNo) const {
168 return MRI.getEncodingValue(RegNo) & HW_REG_MASK;
171 uint64_t R600MCCodeEmitter::getMachineOpValue(const MCInst &MI,
173 SmallVectorImpl<MCFixup> &Fixup,
174 const MCSubtargetInfo &STI) const {
176 if (HAS_NATIVE_OPERANDS(MCII.get(MI.getOpcode()).TSFlags))
177 return MRI.getEncodingValue(MO.getReg());
178 return getHWReg(MO.getReg());
185 #include "AMDGPUGenMCCodeEmitter.inc"