lib/Target/Lanai/MCTargetDesc/LanaiInstPrinter.cpp

   1 //===-- LanaiInstPrinter.cpp - Convert Lanai MCInst to asm syntax ---------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This class prints an Lanai MCInst to a .s file.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "LanaiInstPrinter.h"
  14 #include "LanaiMCExpr.h"
  15 #include "LanaiAluCode.h"
  16 #include "LanaiCondCode.h"
  17 #include "MCTargetDesc/LanaiMCTargetDesc.h"
  18 #include "llvm/MC/MCAsmInfo.h"
  19 #include "llvm/MC/MCExpr.h"
  20 #include "llvm/MC/MCInst.h"
  21 #include "llvm/MC/MCRegisterInfo.h"
  22 #include "llvm/MC/MCSymbol.h"
  23 #include "llvm/Support/ErrorHandling.h"
  24 #include "llvm/Support/FormattedStream.h"
  25
  26 using namespace llvm;
  27
  28 #define DEBUG_TYPE "asm-printer"
  29
  30 // Include the auto-generated portion of the assembly writer.
  31 #define PRINT_ALIAS_INSTR
  32 #include "LanaiGenAsmWriter.inc"
  33
  34 void LanaiInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
  35   OS << StringRef(getRegisterName(RegNo)).lower();
  36 }
  37
  38 bool LanaiInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
  39                                  StringRef Alias, unsigned OpNo0,
  40                                  unsigned OpNo1) {
  41   OS << "\t" << Alias << " ";
  42   printOperand(MI, OpNo0, OS);
  43   OS << ", ";
  44   printOperand(MI, OpNo1, OS);
  45   return true;
  46 }
  47
  48 static bool usesGivenOffset(const MCInst *MI, int AddOffset) {
  49   unsigned AluCode = MI->getOperand(3).getImm();
  50   return LPAC::encodeLanaiAluCode(AluCode) == LPAC::ADD &&
  51          (MI->getOperand(2).getImm() == AddOffset ||
  52           MI->getOperand(2).getImm() == -AddOffset);
  53 }
  54
  55 static bool isPreIncrementForm(const MCInst *MI, int AddOffset) {
  56   unsigned AluCode = MI->getOperand(3).getImm();
  57   return LPAC::isPreOp(AluCode) && usesGivenOffset(MI, AddOffset);
  58 }
  59
  60 static bool isPostIncrementForm(const MCInst *MI, int AddOffset) {
  61   unsigned AluCode = MI->getOperand(3).getImm();
  62   return LPAC::isPostOp(AluCode) && usesGivenOffset(MI, AddOffset);
  63 }
  64
  65 static StringRef decIncOperator(const MCInst *MI) {
  66   if (MI->getOperand(2).getImm() < 0)
  67     return "--";
  68   return "++";
  69 }
  70
  71 bool LanaiInstPrinter::printMemoryLoadIncrement(const MCInst *MI,
  72                                                 raw_ostream &OS,
  73                                                 StringRef Opcode,
  74                                                 int AddOffset) {
  75   if (isPreIncrementForm(MI, AddOffset)) {
  76     OS << "\t" << Opcode << "\t[" << decIncOperator(MI) << "%"
  77        << getRegisterName(MI->getOperand(1).getReg()) << "], %"
  78        << getRegisterName(MI->getOperand(0).getReg());
  79     return true;
  80   }
  81   if (isPostIncrementForm(MI, AddOffset)) {
  82     OS << "\t" << Opcode << "\t[%"
  83        << getRegisterName(MI->getOperand(1).getReg()) << decIncOperator(MI)
  84        << "], %" << getRegisterName(MI->getOperand(0).getReg());
  85     return true;
  86   }
  87   return false;
  88 }
  89
  90 bool LanaiInstPrinter::printMemoryStoreIncrement(const MCInst *MI,
  91                                                  raw_ostream &OS,
  92                                                  StringRef Opcode,
  93                                                  int AddOffset) {
  94   if (isPreIncrementForm(MI, AddOffset)) {
  95     OS << "\t" << Opcode << "\t%" << getRegisterName(MI->getOperand(0).getReg())
  96        << ", [" << decIncOperator(MI) << "%"
  97        << getRegisterName(MI->getOperand(1).getReg()) << "]";
  98     return true;
  99   }
 100   if (isPostIncrementForm(MI, AddOffset)) {
 101     OS << "\t" << Opcode << "\t%" << getRegisterName(MI->getOperand(0).getReg())
 102        << ", [%" << getRegisterName(MI->getOperand(1).getReg())
 103        << decIncOperator(MI) << "]";
 104     return true;
 105   }
 106   return false;
 107 }
 108
 109 bool LanaiInstPrinter::printAlias(const MCInst *MI, raw_ostream &OS) {
 110   switch (MI->getOpcode()) {
 111   case Lanai::LDW_RI:
 112     // ld 4[*%rN], %rX => ld [++imm], %rX
 113     // ld -4[*%rN], %rX => ld [--imm], %rX
 114     // ld 4[%rN*], %rX => ld [imm++], %rX
 115     // ld -4[%rN*], %rX => ld [imm--], %rX
 116     return printMemoryLoadIncrement(MI, OS, "ld", 4);
 117   case Lanai::LDHs_RI:
 118     return printMemoryLoadIncrement(MI, OS, "ld.h", 2);
 119   case Lanai::LDHz_RI:
 120     return printMemoryLoadIncrement(MI, OS, "uld.h", 2);
 121   case Lanai::LDBs_RI:
 122     return printMemoryLoadIncrement(MI, OS, "ld.b", 1);
 123   case Lanai::LDBz_RI:
 124     return printMemoryLoadIncrement(MI, OS, "uld.b", 1);
 125   case Lanai::SW_RI:
 126     // st %rX, 4[*%rN] => st %rX, [++imm]
 127     // st %rX, -4[*%rN] => st %rX, [--imm]
 128     // st %rX, 4[%rN*] => st %rX, [imm++]
 129     // st %rX, -4[%rN*] => st %rX, [imm--]
 130     return printMemoryStoreIncrement(MI, OS, "st", 4);
 131   case Lanai::STH_RI:
 132     return printMemoryStoreIncrement(MI, OS, "st.h", 2);
 133   case Lanai::STB_RI:
 134     return printMemoryStoreIncrement(MI, OS, "st.b", 1);
 135   default:
 136     return false;
 137   }
 138 }
 139
 140 void LanaiInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
 141                                  StringRef Annotation,
 142                                  const MCSubtargetInfo & /*STI*/) {
 143   if (!printAlias(MI, OS) && !printAliasInstr(MI, OS))
 144     printInstruction(MI, OS);
 145   printAnnotation(OS, Annotation);
 146 }
 147
 148 void LanaiInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
 149                                     raw_ostream &OS, const char *Modifier) {
 150   assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
 151   const MCOperand &Op = MI->getOperand(OpNo);
 152   if (Op.isReg())
 153     OS << "%" << getRegisterName(Op.getReg());
 154   else if (Op.isImm())
 155     OS << formatHex(Op.getImm());
 156   else {
 157     assert(Op.isExpr() && "Expected an expression");
 158     Op.getExpr()->print(OS, &MAI);
 159   }
 160 }
 161
 162 void LanaiInstPrinter::printMemImmOperand(const MCInst *MI, unsigned OpNo,
 163                                           raw_ostream &OS) {
 164   const MCOperand &Op = MI->getOperand(OpNo);
 165   if (Op.isImm()) {
 166     OS << '[' << formatHex(Op.getImm()) << ']';
 167   } else {
 168     // Symbolic operand will be lowered to immediate value by linker
 169     assert(Op.isExpr() && "Expected an expression");
 170     OS << '[';
 171     Op.getExpr()->print(OS, &MAI);
 172     OS << ']';
 173   }
 174 }
 175
 176 void LanaiInstPrinter::printHi16ImmOperand(const MCInst *MI, unsigned OpNo,
 177                                            raw_ostream &OS) {
 178   const MCOperand &Op = MI->getOperand(OpNo);
 179   if (Op.isImm()) {
 180     OS << formatHex(Op.getImm() << 16);
 181   } else {
 182     // Symbolic operand will be lowered to immediate value by linker
 183     assert(Op.isExpr() && "Expected an expression");
 184     Op.getExpr()->print(OS, &MAI);
 185   }
 186 }
 187
 188 void LanaiInstPrinter::printHi16AndImmOperand(const MCInst *MI, unsigned OpNo,
 189                                               raw_ostream &OS) {
 190   const MCOperand &Op = MI->getOperand(OpNo);
 191   if (Op.isImm()) {
 192     OS << formatHex((Op.getImm() << 16) | 0xffff);
 193   } else {
 194     // Symbolic operand will be lowered to immediate value by linker
 195     assert(Op.isExpr() && "Expected an expression");
 196     Op.getExpr()->print(OS, &MAI);
 197   }
 198 }
 199
 200 void LanaiInstPrinter::printLo16AndImmOperand(const MCInst *MI, unsigned OpNo,
 201                                               raw_ostream &OS) {
 202   const MCOperand &Op = MI->getOperand(OpNo);
 203   if (Op.isImm()) {
 204     OS << formatHex(0xffff0000 | Op.getImm());
 205   } else {
 206     // Symbolic operand will be lowered to immediate value by linker
 207     assert(Op.isExpr() && "Expected an expression");
 208     Op.getExpr()->print(OS, &MAI);
 209   }
 210 }
 211
 212 static void printMemoryBaseRegister(raw_ostream &OS, const unsigned AluCode,
 213                                     const MCOperand &RegOp) {
 214   assert(RegOp.isReg() && "Register operand expected");
 215   OS << "[";
 216   if (LPAC::isPreOp(AluCode))
 217     OS << "*";
 218   OS << "%" << LanaiInstPrinter::getRegisterName(RegOp.getReg());
 219   if (LPAC::isPostOp(AluCode))
 220     OS << "*";
 221   OS << "]";
 222 }
 223
 224 template <unsigned SizeInBits>
 225 static void printMemoryImmediateOffset(const MCAsmInfo &MAI,
 226                                        const MCOperand &OffsetOp,
 227                                        raw_ostream &OS) {
 228   assert((OffsetOp.isImm() || OffsetOp.isExpr()) && "Immediate expected");
 229   if (OffsetOp.isImm()) {
 230     assert(isInt<SizeInBits>(OffsetOp.getImm()) && "Constant value truncated");
 231     OS << OffsetOp.getImm();
 232   } else
 233     OffsetOp.getExpr()->print(OS, &MAI);
 234 }
 235
 236 void LanaiInstPrinter::printMemRiOperand(const MCInst *MI, int OpNo,
 237                                          raw_ostream &OS,
 238                                          const char * /*Modifier*/) {
 239   const MCOperand &RegOp = MI->getOperand(OpNo);
 240   const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
 241   const MCOperand &AluOp = MI->getOperand(OpNo + 2);
 242   const unsigned AluCode = AluOp.getImm();
 243
 244   // Offset
 245   printMemoryImmediateOffset<16>(MAI, OffsetOp, OS);
 246
 247   // Register
 248   printMemoryBaseRegister(OS, AluCode, RegOp);
 249 }
 250
 251 void LanaiInstPrinter::printMemRrOperand(const MCInst *MI, int OpNo,
 252                                          raw_ostream &OS,
 253                                          const char * /*Modifier*/) {
 254   const MCOperand &RegOp = MI->getOperand(OpNo);
 255   const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
 256   const MCOperand &AluOp = MI->getOperand(OpNo + 2);
 257   const unsigned AluCode = AluOp.getImm();
 258   assert(OffsetOp.isReg() && RegOp.isReg() && "Registers expected.");
 259
 260   // [ Base OP Offset ]
 261   OS << "[";
 262   if (LPAC::isPreOp(AluCode))
 263     OS << "*";
 264   OS << "%" << getRegisterName(RegOp.getReg());
 265   if (LPAC::isPostOp(AluCode))
 266     OS << "*";
 267   OS << " " << LPAC::lanaiAluCodeToString(AluCode) << " ";
 268   OS << "%" << getRegisterName(OffsetOp.getReg());
 269   OS << "]";
 270 }
 271
 272 void LanaiInstPrinter::printMemSplsOperand(const MCInst *MI, int OpNo,
 273                                            raw_ostream &OS,
 274                                            const char * /*Modifier*/) {
 275   const MCOperand &RegOp = MI->getOperand(OpNo);
 276   const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
 277   const MCOperand &AluOp = MI->getOperand(OpNo + 2);
 278   const unsigned AluCode = AluOp.getImm();
 279
 280   // Offset
 281   printMemoryImmediateOffset<10>(MAI, OffsetOp, OS);
 282
 283   // Register
 284   printMemoryBaseRegister(OS, AluCode, RegOp);
 285 }
 286
 287 void LanaiInstPrinter::printCCOperand(const MCInst *MI, int OpNo,
 288                                       raw_ostream &OS) {
 289   LPCC::CondCode CC =
 290       static_cast<LPCC::CondCode>(MI->getOperand(OpNo).getImm());
 291   // Handle the undefined value here for printing so we don't abort().
 292   if (CC >= LPCC::UNKNOWN)
 293     OS << "<und>";
 294   else
 295     OS << lanaiCondCodeToString(CC);
 296 }
 297
 298 void LanaiInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNo,
 299                                              raw_ostream &OS) {
 300   LPCC::CondCode CC =
 301       static_cast<LPCC::CondCode>(MI->getOperand(OpNo).getImm());
 302   // Handle the undefined value here for printing so we don't abort().
 303   if (CC >= LPCC::UNKNOWN)
 304     OS << "<und>";
 305   else if (CC != LPCC::ICC_T)
 306     OS << "." << lanaiCondCodeToString(CC);
 307 }