1 //===-- AMDGPUAsmPrinter.cpp - AMDGPU Assebly printer --------------------===//
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 /// The AMDGPUAsmPrinter is used to print both assembly string and also binary
13 /// code. When passed an MCAsmStreamer it prints assembly and when passed
14 /// an MCObjectStreamer it outputs binary code.
16 //===----------------------------------------------------------------------===//
20 #include "AMDGPUAsmPrinter.h"
22 #include "R600Defines.h"
23 #include "R600MachineFunctionInfo.h"
24 #include "R600RegisterInfo.h"
25 #include "SIDefines.h"
26 #include "SIMachineFunctionInfo.h"
27 #include "SIRegisterInfo.h"
28 #include "llvm/MC/MCContext.h"
29 #include "llvm/MC/MCSectionELF.h"
30 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/Support/ELF.h"
32 #include "llvm/Support/MathExtras.h"
33 #include "llvm/Support/TargetRegistry.h"
34 #include "llvm/Target/TargetLoweringObjectFile.h"
39 static AsmPrinter *createAMDGPUAsmPrinterPass(TargetMachine &tm,
40 MCStreamer &Streamer) {
41 return new AMDGPUAsmPrinter(tm, Streamer);
44 extern "C" void LLVMInitializeR600AsmPrinter() {
45 TargetRegistry::RegisterAsmPrinter(TheAMDGPUTarget, createAMDGPUAsmPrinterPass);
48 AMDGPUAsmPrinter::AMDGPUAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
49 : AsmPrinter(TM, Streamer) {
50 DisasmEnabled = TM.getSubtarget<AMDGPUSubtarget>().dumpCode() &&
51 ! Streamer.hasRawTextSupport();
54 /// We need to override this function so we can avoid
55 /// the call to EmitFunctionHeader(), which the MCPureStreamer can't handle.
56 bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
57 SetupMachineFunction(MF);
59 if (OutStreamer.hasRawTextSupport()) {
60 OutStreamer.EmitRawText("@" + MF.getName() + ":");
63 MCContext &Context = getObjFileLowering().getContext();
64 const MCSectionELF *ConfigSection = Context.getELFSection(".AMDGPU.config",
66 SectionKind::getReadOnly());
67 OutStreamer.SwitchSection(ConfigSection);
69 const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
70 SIProgramInfo KernelInfo;
71 if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
72 findNumUsedRegistersSI(MF, KernelInfo.NumSGPR, KernelInfo.NumVGPR);
73 EmitProgramInfoSI(MF, KernelInfo);
75 EmitProgramInfoR600(MF);
82 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
85 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
86 const MCSectionELF *CommentSection
87 = Context.getELFSection(".AMDGPU.csdata",
89 SectionKind::getReadOnly());
90 OutStreamer.SwitchSection(CommentSection);
92 if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
93 OutStreamer.emitRawComment("Kernel info:", false);
94 OutStreamer.emitRawComment("NumSgprs: " + Twine(KernelInfo.NumSGPR),
96 OutStreamer.emitRawComment("NumVgprs: " + Twine(KernelInfo.NumVGPR),
99 R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
100 OutStreamer.EmitRawText(
101 Twine("SQ_PGM_RESOURCES:STACK_SIZE = " + Twine(MFI->StackSize)));
105 if (STM.dumpCode()) {
106 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
111 OutStreamer.SwitchSection(Context.getELFSection(".AMDGPU.disasm",
113 SectionKind::getReadOnly()));
115 for (size_t i = 0; i < DisasmLines.size(); ++i) {
116 std::string Comment(DisasmLineMaxLen - DisasmLines[i].size(), ' ');
117 Comment += " ; " + HexLines[i] + "\n";
119 OutStreamer.EmitBytes(StringRef(DisasmLines[i]));
120 OutStreamer.EmitBytes(StringRef(Comment));
128 void AMDGPUAsmPrinter::EmitProgramInfoR600(MachineFunction &MF) {
130 bool killPixel = false;
131 const R600RegisterInfo * RI =
132 static_cast<const R600RegisterInfo*>(TM.getRegisterInfo());
133 R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
134 const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
136 for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
138 MachineBasicBlock &MBB = *BB;
139 for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
141 MachineInstr &MI = *I;
142 if (MI.getOpcode() == AMDGPU::KILLGT)
144 unsigned numOperands = MI.getNumOperands();
145 for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
146 MachineOperand & MO = MI.getOperand(op_idx);
149 unsigned HWReg = RI->getEncodingValue(MO.getReg()) & 0xff;
151 // Register with value > 127 aren't GPR
154 MaxGPR = std::max(MaxGPR, HWReg);
160 if (STM.getGeneration() >= AMDGPUSubtarget::EVERGREEN) {
161 // Evergreen / Northern Islands
162 switch (MFI->ShaderType) {
163 default: // Fall through
164 case ShaderType::COMPUTE: RsrcReg = R_0288D4_SQ_PGM_RESOURCES_LS; break;
165 case ShaderType::GEOMETRY: RsrcReg = R_028878_SQ_PGM_RESOURCES_GS; break;
166 case ShaderType::PIXEL: RsrcReg = R_028844_SQ_PGM_RESOURCES_PS; break;
167 case ShaderType::VERTEX: RsrcReg = R_028860_SQ_PGM_RESOURCES_VS; break;
171 switch (MFI->ShaderType) {
172 default: // Fall through
173 case ShaderType::GEOMETRY: // Fall through
174 case ShaderType::COMPUTE: // Fall through
175 case ShaderType::VERTEX: RsrcReg = R_028868_SQ_PGM_RESOURCES_VS; break;
176 case ShaderType::PIXEL: RsrcReg = R_028850_SQ_PGM_RESOURCES_PS; break;
180 OutStreamer.EmitIntValue(RsrcReg, 4);
181 OutStreamer.EmitIntValue(S_NUM_GPRS(MaxGPR + 1) |
182 S_STACK_SIZE(MFI->StackSize), 4);
183 OutStreamer.EmitIntValue(R_02880C_DB_SHADER_CONTROL, 4);
184 OutStreamer.EmitIntValue(S_02880C_KILL_ENABLE(killPixel), 4);
186 if (MFI->ShaderType == ShaderType::COMPUTE) {
187 OutStreamer.EmitIntValue(R_0288E8_SQ_LDS_ALLOC, 4);
188 OutStreamer.EmitIntValue(RoundUpToAlignment(MFI->LDSSize, 4) >> 2, 4);
192 void AMDGPUAsmPrinter::findNumUsedRegistersSI(MachineFunction &MF,
194 unsigned &NumVGPR) const {
195 unsigned MaxSGPR = 0;
196 unsigned MaxVGPR = 0;
197 bool VCCUsed = false;
198 const SIRegisterInfo * RI =
199 static_cast<const SIRegisterInfo*>(TM.getRegisterInfo());
201 for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
203 MachineBasicBlock &MBB = *BB;
204 for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
206 MachineInstr &MI = *I;
208 unsigned numOperands = MI.getNumOperands();
209 for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
210 MachineOperand &MO = MI.getOperand(op_idx);
217 unsigned reg = MO.getReg();
218 if (reg == AMDGPU::VCC) {
231 if (AMDGPU::SReg_32RegClass.contains(reg)) {
234 } else if (AMDGPU::VReg_32RegClass.contains(reg)) {
237 } else if (AMDGPU::SReg_64RegClass.contains(reg)) {
240 } else if (AMDGPU::VReg_64RegClass.contains(reg)) {
243 } else if (AMDGPU::VReg_96RegClass.contains(reg)) {
246 } else if (AMDGPU::SReg_128RegClass.contains(reg)) {
249 } else if (AMDGPU::VReg_128RegClass.contains(reg)) {
252 } else if (AMDGPU::SReg_256RegClass.contains(reg)) {
255 } else if (AMDGPU::VReg_256RegClass.contains(reg)) {
258 } else if (AMDGPU::SReg_512RegClass.contains(reg)) {
261 } else if (AMDGPU::VReg_512RegClass.contains(reg)) {
265 llvm_unreachable("Unknown register class");
267 unsigned hwReg = RI->getEncodingValue(reg) & 0xff;
268 unsigned maxUsed = hwReg + width - 1;
270 MaxSGPR = maxUsed > MaxSGPR ? maxUsed : MaxSGPR;
272 MaxVGPR = maxUsed > MaxVGPR ? maxUsed : MaxVGPR;
285 void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &Out,
286 MachineFunction &MF) const {
287 findNumUsedRegistersSI(MF, Out.NumSGPR, Out.NumVGPR);
290 void AMDGPUAsmPrinter::EmitProgramInfoSI(MachineFunction &MF,
291 const SIProgramInfo &KernelInfo) {
292 const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
294 SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
296 switch (MFI->ShaderType) {
297 default: // Fall through
298 case ShaderType::COMPUTE: RsrcReg = R_00B848_COMPUTE_PGM_RSRC1; break;
299 case ShaderType::GEOMETRY: RsrcReg = R_00B228_SPI_SHADER_PGM_RSRC1_GS; break;
300 case ShaderType::PIXEL: RsrcReg = R_00B028_SPI_SHADER_PGM_RSRC1_PS; break;
301 case ShaderType::VERTEX: RsrcReg = R_00B128_SPI_SHADER_PGM_RSRC1_VS; break;
304 OutStreamer.EmitIntValue(RsrcReg, 4);
305 OutStreamer.EmitIntValue(S_00B028_VGPRS(KernelInfo.NumVGPR / 4) |
306 S_00B028_SGPRS(KernelInfo.NumSGPR / 8), 4);
308 unsigned LDSAlignShift;
309 if (STM.getGeneration() < AMDGPUSubtarget::SEA_ISLANDS) {
310 // LDS is allocated in 64 dword blocks
313 // LDS is allocated in 128 dword blocks
317 RoundUpToAlignment(MFI->LDSSize, 1 << LDSAlignShift) >> LDSAlignShift;
319 if (MFI->ShaderType == ShaderType::COMPUTE) {
320 OutStreamer.EmitIntValue(R_00B84C_COMPUTE_PGM_RSRC2, 4);
321 OutStreamer.EmitIntValue(S_00B84C_LDS_SIZE(LDSBlocks), 4);
323 if (MFI->ShaderType == ShaderType::PIXEL) {
324 OutStreamer.EmitIntValue(R_00B02C_SPI_SHADER_PGM_RSRC2_PS, 4);
325 OutStreamer.EmitIntValue(S_00B02C_EXTRA_LDS_SIZE(LDSBlocks), 4);
326 OutStreamer.EmitIntValue(R_0286CC_SPI_PS_INPUT_ENA, 4);
327 OutStreamer.EmitIntValue(MFI->PSInputAddr, 4);