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"
33 class R600MCCodeEmitter : public AMDGPUMCCodeEmitter {
34 R600MCCodeEmitter(const R600MCCodeEmitter &) LLVM_DELETED_FUNCTION;
35 void operator=(const R600MCCodeEmitter &) LLVM_DELETED_FUNCTION;
36 const MCInstrInfo &MCII;
37 const MCRegisterInfo &MRI;
38 const MCSubtargetInfo &STI;
43 R600MCCodeEmitter(const MCInstrInfo &mcii, const MCRegisterInfo &mri,
44 const MCSubtargetInfo &sti, MCContext &ctx)
45 : MCII(mcii), MRI(mri), STI(sti), Ctx(ctx) { }
47 /// \brief Encode the instruction and write it to the OS.
48 virtual void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
49 SmallVectorImpl<MCFixup> &Fixups) const;
51 /// \returns the encoding for an MCOperand.
52 virtual uint64_t getMachineOpValue(const MCInst &MI, const MCOperand &MO,
53 SmallVectorImpl<MCFixup> &Fixups) const;
56 void EmitByte(unsigned int byte, raw_ostream &OS) const;
58 void Emit(uint32_t value, raw_ostream &OS) const;
59 void Emit(uint64_t value, raw_ostream &OS) const;
61 unsigned getHWRegChan(unsigned reg) const;
62 unsigned getHWReg(unsigned regNo) const;
66 } // End anonymous namespace
96 TEXTURE_SHADOW1D_ARRAY,
97 TEXTURE_SHADOW2D_ARRAY
100 MCCodeEmitter *llvm::createR600MCCodeEmitter(const MCInstrInfo &MCII,
101 const MCRegisterInfo &MRI,
102 const MCSubtargetInfo &STI,
104 return new R600MCCodeEmitter(MCII, MRI, STI, Ctx);
107 void R600MCCodeEmitter::EncodeInstruction(const MCInst &MI, raw_ostream &OS,
108 SmallVectorImpl<MCFixup> &Fixups) const {
109 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
110 if (MI.getOpcode() == AMDGPU::RETURN ||
111 MI.getOpcode() == AMDGPU::FETCH_CLAUSE ||
112 MI.getOpcode() == AMDGPU::ALU_CLAUSE ||
113 MI.getOpcode() == AMDGPU::BUNDLE ||
114 MI.getOpcode() == AMDGPU::KILL) {
116 } else if (IS_VTX(Desc)) {
117 uint64_t InstWord01 = getBinaryCodeForInstr(MI, Fixups);
118 uint32_t InstWord2 = MI.getOperand(2).getImm(); // Offset
119 InstWord2 |= 1 << 19;
121 Emit(InstWord01, OS);
123 Emit((u_int32_t) 0, OS);
124 } else if (IS_TEX(Desc)) {
125 unsigned Opcode = MI.getOpcode();
126 bool HasOffsets = (Opcode == AMDGPU::TEX_LD);
127 unsigned OpOffset = HasOffsets ? 3 : 0;
128 int64_t Sampler = MI.getOperand(OpOffset + 3).getImm();
129 int64_t TextureType = MI.getOperand(OpOffset + 4).getImm();
131 uint32_t SrcSelect[4] = {0, 1, 2, 3};
132 uint32_t Offsets[3] = {0, 0, 0};
133 uint64_t CoordType[4] = {1, 1, 1, 1};
136 for (unsigned i = 0; i < 3; i++) {
137 int SignedOffset = MI.getOperand(i + 2).getImm();
138 Offsets[i] = (SignedOffset & 0x1F);
141 if (TextureType == TEXTURE_RECT ||
142 TextureType == TEXTURE_SHADOWRECT) {
143 CoordType[ELEMENT_X] = 0;
144 CoordType[ELEMENT_Y] = 0;
147 if (TextureType == TEXTURE_1D_ARRAY ||
148 TextureType == TEXTURE_SHADOW1D_ARRAY) {
149 if (Opcode == AMDGPU::TEX_SAMPLE_C_L ||
150 Opcode == AMDGPU::TEX_SAMPLE_C_LB) {
151 CoordType[ELEMENT_Y] = 0;
153 CoordType[ELEMENT_Z] = 0;
154 SrcSelect[ELEMENT_Z] = ELEMENT_Y;
156 } else if (TextureType == TEXTURE_2D_ARRAY ||
157 TextureType == TEXTURE_SHADOW2D_ARRAY) {
158 CoordType[ELEMENT_Z] = 0;
162 if ((TextureType == TEXTURE_SHADOW1D ||
163 TextureType == TEXTURE_SHADOW2D ||
164 TextureType == TEXTURE_SHADOWRECT ||
165 TextureType == TEXTURE_SHADOW1D_ARRAY) &&
166 Opcode != AMDGPU::TEX_SAMPLE_C_L &&
167 Opcode != AMDGPU::TEX_SAMPLE_C_LB) {
168 SrcSelect[ELEMENT_W] = ELEMENT_Z;
171 uint64_t Word01 = getBinaryCodeForInstr(MI, Fixups) |
172 CoordType[ELEMENT_X] << 60 | CoordType[ELEMENT_Y] << 61 |
173 CoordType[ELEMENT_Z] << 62 | CoordType[ELEMENT_W] << 63;
174 uint32_t Word2 = Sampler << 15 | SrcSelect[ELEMENT_X] << 20 |
175 SrcSelect[ELEMENT_Y] << 23 | SrcSelect[ELEMENT_Z] << 26 |
176 SrcSelect[ELEMENT_W] << 29 | Offsets[0] << 0 | Offsets[1] << 5 |
181 Emit((u_int32_t) 0, OS);
183 uint64_t Inst = getBinaryCodeForInstr(MI, Fixups);
188 void R600MCCodeEmitter::EmitByte(unsigned int Byte, raw_ostream &OS) const {
189 OS.write((uint8_t) Byte & 0xff);
192 void R600MCCodeEmitter::Emit(uint32_t Value, raw_ostream &OS) const {
193 for (unsigned i = 0; i < 4; i++) {
194 OS.write((uint8_t) ((Value >> (8 * i)) & 0xff));
198 void R600MCCodeEmitter::Emit(uint64_t Value, raw_ostream &OS) const {
199 for (unsigned i = 0; i < 8; i++) {
200 EmitByte((Value >> (8 * i)) & 0xff, OS);
204 unsigned R600MCCodeEmitter::getHWRegChan(unsigned reg) const {
205 return MRI.getEncodingValue(reg) >> HW_CHAN_SHIFT;
208 unsigned R600MCCodeEmitter::getHWReg(unsigned RegNo) const {
209 return MRI.getEncodingValue(RegNo) & HW_REG_MASK;
212 uint64_t R600MCCodeEmitter::getMachineOpValue(const MCInst &MI,
214 SmallVectorImpl<MCFixup> &Fixup) const {
216 if (HAS_NATIVE_OPERANDS(MCII.get(MI.getOpcode()).TSFlags)) {
217 return MRI.getEncodingValue(MO.getReg());
219 return getHWReg(MO.getReg());
221 } else if (MO.isImm()) {
229 #include "AMDGPUGenMCCodeEmitter.inc"