lib/Target/R600/AMDGPUAsmPrinter.cpp

   1 //===-- AMDGPUAsmPrinter.cpp - AMDGPU Assebly printer  --------------------===//
   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 /// \file
  11 ///
  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.
  15 //
  16 //===----------------------------------------------------------------------===//
  17 //
  18
  19
  20 #include "AMDGPUAsmPrinter.h"
  21 #include "AMDGPU.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"
  35
  36 using namespace llvm;
  37
  38
  39 static AsmPrinter *createAMDGPUAsmPrinterPass(TargetMachine &tm,
  40                                               MCStreamer &Streamer) {
  41   return new AMDGPUAsmPrinter(tm, Streamer);
  42 }
  43
  44 extern "C" void LLVMInitializeR600AsmPrinter() {
  45   TargetRegistry::RegisterAsmPrinter(TheAMDGPUTarget, createAMDGPUAsmPrinterPass);
  46 }
  47
  48 AMDGPUAsmPrinter::AMDGPUAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
  49     : AsmPrinter(TM, Streamer) {
  50   DisasmEnabled = TM.getSubtarget<AMDGPUSubtarget>().dumpCode();
  51 }
  52
  53 /// We need to override this function so we can avoid
  54 /// the call to EmitFunctionHeader(), which the MCPureStreamer can't handle.
  55 bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
  56   SetupMachineFunction(MF);
  57
  58   OutStreamer.emitRawComment(Twine('@') + MF.getName() + Twine(':'));
  59
  60   MCContext &Context = getObjFileLowering().getContext();
  61   const MCSectionELF *ConfigSection = Context.getELFSection(".AMDGPU.config",
  62                                               ELF::SHT_PROGBITS, 0,
  63                                               SectionKind::getReadOnly());
  64   OutStreamer.SwitchSection(ConfigSection);
  65
  66   const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
  67   SIProgramInfo KernelInfo;
  68   if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
  69     findNumUsedRegistersSI(MF, KernelInfo.NumSGPR, KernelInfo.NumVGPR);
  70     EmitProgramInfoSI(MF, KernelInfo);
  71   } else {
  72     EmitProgramInfoR600(MF);
  73   }
  74
  75   DisasmLines.clear();
  76   HexLines.clear();
  77   DisasmLineMaxLen = 0;
  78
  79   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
  80   EmitFunctionBody();
  81
  82   if (isVerbose()) {
  83     const MCSectionELF *CommentSection
  84       = Context.getELFSection(".AMDGPU.csdata",
  85                               ELF::SHT_PROGBITS, 0,
  86                               SectionKind::getReadOnly());
  87     OutStreamer.SwitchSection(CommentSection);
  88
  89     if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
  90       OutStreamer.emitRawComment(" Kernel info:", false);
  91       OutStreamer.emitRawComment(" NumSgprs: " + Twine(KernelInfo.NumSGPR),
  92                                  false);
  93       OutStreamer.emitRawComment(" NumVgprs: " + Twine(KernelInfo.NumVGPR),
  94                                  false);
  95     } else {
  96       R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
  97       OutStreamer.emitRawComment(
  98         Twine("SQ_PGM_RESOURCES:STACK_SIZE = " + Twine(MFI->StackSize)));
  99     }
 100   }
 101
 102   if (STM.dumpCode()) {
 103 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 104     MF.dump();
 105 #endif
 106
 107     if (DisasmEnabled) {
 108       OutStreamer.SwitchSection(Context.getELFSection(".AMDGPU.disasm",
 109                                                   ELF::SHT_NOTE, 0,
 110                                                   SectionKind::getReadOnly()));
 111
 112       for (size_t i = 0; i < DisasmLines.size(); ++i) {
 113         std::string Comment(DisasmLineMaxLen - DisasmLines[i].size(), ' ');
 114         Comment += " ; " + HexLines[i] + "\n";
 115
 116         OutStreamer.EmitBytes(StringRef(DisasmLines[i]));
 117         OutStreamer.EmitBytes(StringRef(Comment));
 118       }
 119     }
 120   }
 121
 122   return false;
 123 }
 124
 125 void AMDGPUAsmPrinter::EmitProgramInfoR600(MachineFunction &MF) {
 126   unsigned MaxGPR = 0;
 127   bool killPixel = false;
 128   const R600RegisterInfo * RI =
 129                 static_cast<const R600RegisterInfo*>(TM.getRegisterInfo());
 130   R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
 131   const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
 132
 133   for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
 134                                                   BB != BB_E; ++BB) {
 135     MachineBasicBlock &MBB = *BB;
 136     for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
 137                                                     I != E; ++I) {
 138       MachineInstr &MI = *I;
 139       if (MI.getOpcode() == AMDGPU::KILLGT)
 140         killPixel = true;
 141       unsigned numOperands = MI.getNumOperands();
 142       for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
 143         MachineOperand & MO = MI.getOperand(op_idx);
 144         if (!MO.isReg())
 145           continue;
 146         unsigned HWReg = RI->getEncodingValue(MO.getReg()) & 0xff;
 147
 148         // Register with value > 127 aren't GPR
 149         if (HWReg > 127)
 150           continue;
 151         MaxGPR = std::max(MaxGPR, HWReg);
 152       }
 153     }
 154   }
 155
 156   unsigned RsrcReg;
 157   if (STM.getGeneration() >= AMDGPUSubtarget::EVERGREEN) {
 158     // Evergreen / Northern Islands
 159     switch (MFI->ShaderType) {
 160     default: // Fall through
 161     case ShaderType::COMPUTE:  RsrcReg = R_0288D4_SQ_PGM_RESOURCES_LS; break;
 162     case ShaderType::GEOMETRY: RsrcReg = R_028878_SQ_PGM_RESOURCES_GS; break;
 163     case ShaderType::PIXEL:    RsrcReg = R_028844_SQ_PGM_RESOURCES_PS; break;
 164     case ShaderType::VERTEX:   RsrcReg = R_028860_SQ_PGM_RESOURCES_VS; break;
 165     }
 166   } else {
 167     // R600 / R700
 168     switch (MFI->ShaderType) {
 169     default: // Fall through
 170     case ShaderType::GEOMETRY: // Fall through
 171     case ShaderType::COMPUTE:  // Fall through
 172     case ShaderType::VERTEX:   RsrcReg = R_028868_SQ_PGM_RESOURCES_VS; break;
 173     case ShaderType::PIXEL:    RsrcReg = R_028850_SQ_PGM_RESOURCES_PS; break;
 174     }
 175   }
 176
 177   OutStreamer.EmitIntValue(RsrcReg, 4);
 178   OutStreamer.EmitIntValue(S_NUM_GPRS(MaxGPR + 1) |
 179                            S_STACK_SIZE(MFI->StackSize), 4);
 180   OutStreamer.EmitIntValue(R_02880C_DB_SHADER_CONTROL, 4);
 181   OutStreamer.EmitIntValue(S_02880C_KILL_ENABLE(killPixel), 4);
 182
 183   if (MFI->ShaderType == ShaderType::COMPUTE) {
 184     OutStreamer.EmitIntValue(R_0288E8_SQ_LDS_ALLOC, 4);
 185     OutStreamer.EmitIntValue(RoundUpToAlignment(MFI->LDSSize, 4) >> 2, 4);
 186   }
 187 }
 188
 189 void AMDGPUAsmPrinter::findNumUsedRegistersSI(MachineFunction &MF,
 190                                               unsigned &NumSGPR,
 191                                               unsigned &NumVGPR) const {
 192   unsigned MaxSGPR = 0;
 193   unsigned MaxVGPR = 0;
 194   bool VCCUsed = false;
 195   const SIRegisterInfo * RI =
 196                 static_cast<const SIRegisterInfo*>(TM.getRegisterInfo());
 197
 198   for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
 199                                                   BB != BB_E; ++BB) {
 200     MachineBasicBlock &MBB = *BB;
 201     for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
 202                                                     I != E; ++I) {
 203       MachineInstr &MI = *I;
 204
 205       unsigned numOperands = MI.getNumOperands();
 206       for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
 207         MachineOperand &MO = MI.getOperand(op_idx);
 208         unsigned width = 0;
 209         bool isSGPR = false;
 210
 211         if (!MO.isReg()) {
 212           continue;
 213         }
 214         unsigned reg = MO.getReg();
 215         if (reg == AMDGPU::VCC) {
 216           VCCUsed = true;
 217           continue;
 218         }
 219
 220         switch (reg) {
 221         default: break;
 222         case AMDGPU::SCC:
 223         case AMDGPU::EXEC:
 224         case AMDGPU::M0:
 225           continue;
 226         }
 227
 228         if (AMDGPU::SReg_32RegClass.contains(reg)) {
 229           isSGPR = true;
 230           width = 1;
 231         } else if (AMDGPU::VReg_32RegClass.contains(reg)) {
 232           isSGPR = false;
 233           width = 1;
 234         } else if (AMDGPU::SReg_64RegClass.contains(reg)) {
 235           isSGPR = true;
 236           width = 2;
 237         } else if (AMDGPU::VReg_64RegClass.contains(reg)) {
 238           isSGPR = false;
 239           width = 2;
 240         } else if (AMDGPU::VReg_96RegClass.contains(reg)) {
 241           isSGPR = false;
 242           width = 3;
 243         } else if (AMDGPU::SReg_128RegClass.contains(reg)) {
 244           isSGPR = true;
 245           width = 4;
 246         } else if (AMDGPU::VReg_128RegClass.contains(reg)) {
 247           isSGPR = false;
 248           width = 4;
 249         } else if (AMDGPU::SReg_256RegClass.contains(reg)) {
 250           isSGPR = true;
 251           width = 8;
 252         } else if (AMDGPU::VReg_256RegClass.contains(reg)) {
 253           isSGPR = false;
 254           width = 8;
 255         } else if (AMDGPU::SReg_512RegClass.contains(reg)) {
 256           isSGPR = true;
 257           width = 16;
 258         } else if (AMDGPU::VReg_512RegClass.contains(reg)) {
 259           isSGPR = false;
 260           width = 16;
 261         } else {
 262           llvm_unreachable("Unknown register class");
 263         }
 264         unsigned hwReg = RI->getEncodingValue(reg) & 0xff;
 265         unsigned maxUsed = hwReg + width - 1;
 266         if (isSGPR) {
 267           MaxSGPR = maxUsed > MaxSGPR ? maxUsed : MaxSGPR;
 268         } else {
 269           MaxVGPR = maxUsed > MaxVGPR ? maxUsed : MaxVGPR;
 270         }
 271       }
 272     }
 273   }
 274
 275   if (VCCUsed)
 276     MaxSGPR += 2;
 277
 278   NumSGPR = MaxSGPR;
 279   NumVGPR = MaxVGPR;
 280 }
 281
 282 void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &Out,
 283                                         MachineFunction &MF) const {
 284   findNumUsedRegistersSI(MF, Out.NumSGPR, Out.NumVGPR);
 285 }
 286
 287 void AMDGPUAsmPrinter::EmitProgramInfoSI(MachineFunction &MF,
 288                                          const SIProgramInfo &KernelInfo) {
 289   const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
 290
 291   SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
 292   unsigned RsrcReg;
 293   switch (MFI->ShaderType) {
 294   default: // Fall through
 295   case ShaderType::COMPUTE:  RsrcReg = R_00B848_COMPUTE_PGM_RSRC1; break;
 296   case ShaderType::GEOMETRY: RsrcReg = R_00B228_SPI_SHADER_PGM_RSRC1_GS; break;
 297   case ShaderType::PIXEL:    RsrcReg = R_00B028_SPI_SHADER_PGM_RSRC1_PS; break;
 298   case ShaderType::VERTEX:   RsrcReg = R_00B128_SPI_SHADER_PGM_RSRC1_VS; break;
 299   }
 300
 301   OutStreamer.EmitIntValue(RsrcReg, 4);
 302   OutStreamer.EmitIntValue(S_00B028_VGPRS(KernelInfo.NumVGPR / 4) |
 303                            S_00B028_SGPRS(KernelInfo.NumSGPR / 8), 4);
 304
 305   unsigned LDSAlignShift;
 306   if (STM.getGeneration() < AMDGPUSubtarget::SEA_ISLANDS) {
 307     // LDS is allocated in 64 dword blocks
 308     LDSAlignShift = 8;
 309   } else {
 310     // LDS is allocated in 128 dword blocks
 311     LDSAlignShift = 9;
 312   }
 313   unsigned LDSBlocks =
 314           RoundUpToAlignment(MFI->LDSSize, 1 << LDSAlignShift) >> LDSAlignShift;
 315
 316   if (MFI->ShaderType == ShaderType::COMPUTE) {
 317     OutStreamer.EmitIntValue(R_00B84C_COMPUTE_PGM_RSRC2, 4);
 318     OutStreamer.EmitIntValue(S_00B84C_LDS_SIZE(LDSBlocks), 4);
 319   }
 320   if (MFI->ShaderType == ShaderType::PIXEL) {
 321     OutStreamer.EmitIntValue(R_00B02C_SPI_SHADER_PGM_RSRC2_PS, 4);
 322     OutStreamer.EmitIntValue(S_00B02C_EXTRA_LDS_SIZE(LDSBlocks), 4);
 323     OutStreamer.EmitIntValue(R_0286CC_SPI_PS_INPUT_ENA, 4);
 324     OutStreamer.EmitIntValue(MFI->PSInputAddr, 4);
 325   }
 326 }