[lanai] Add Lanai backend.

Add the Lanai backend to lib/Target.

General Lanai backend discussion on llvm-dev thread "[RFC] Lanai backend" (http://lists.llvm.org/pipermail/llvm-dev/2016-February/095118.html).

Differential Revision: http://reviews.llvm.org/D17011

llvm-svn: 264578

1 files changed, 309 insertions, 0 deletions

diff --git a/llvm/lib/Target/Lanai/InstPrinter/LanaiInstPrinter.cpp b/llvm/lib/Target/Lanai/InstPrinter/LanaiInstPrinter.cpp
new file mode 100644
index 00000000000..6460b88d142
--- /dev/null
+++ b/llvm/lib/Target/Lanai/InstPrinter/LanaiInstPrinter.cpp
@@ -0,0 +1,309 @@
+//===-- LanaiInstPrinter.cpp - Convert Lanai MCInst to asm syntax ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class prints an Lanai MCInst to a .s file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Lanai.h"
+#include "LanaiInstPrinter.h"
+#include "MCTargetDesc/LanaiMCExpr.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "asm-printer"
+
+// Include the auto-generated portion of the assembly writer.
+#define PRINT_ALIAS_INSTR
+#include "LanaiGenAsmWriter.inc"
+
+void LanaiInstPrinter::printRegName(raw_ostream &Ostream,
+                                    unsigned RegNo) const {
+  Ostream << StringRef(getRegisterName(RegNo)).lower();
+}
+
+bool LanaiInstPrinter::printInst(const MCInst *MI, raw_ostream &Ostream,
+                                 StringRef Alias, unsigned OpNo0,
+                                 unsigned OpNo1) {
+  Ostream << "\t" << Alias << " ";
+  printOperand(MI, OpNo0, Ostream);
+  Ostream << ", ";
+  printOperand(MI, OpNo1, Ostream);
+  return true;
+}
+
+static bool usesGivenOffset(const MCInst *MI, int AddOffset) {
+  unsigned AluCode = MI->getOperand(3).getImm();
+  return LPAC::encodeLanaiAluCode(AluCode) == LPAC::ADD &&
+         (MI->getOperand(2).getImm() == AddOffset ||
+          MI->getOperand(2).getImm() == -AddOffset);
+}
+
+static bool isPreIncrementForm(const MCInst *MI, int AddOffset) {
+  unsigned AluCode = MI->getOperand(3).getImm();
+  return LPAC::isPreOp(AluCode) && usesGivenOffset(MI, AddOffset);
+}
+
+static bool isPostIncrementForm(const MCInst *MI, int AddOffset) {
+  unsigned AluCode = MI->getOperand(3).getImm();
+  return LPAC::isPostOp(AluCode) && usesGivenOffset(MI, AddOffset);
+}
+
+static StringRef decIncOperator(const MCInst *MI) {
+  if (MI->getOperand(2).getImm() < 0)
+    return "--";
+  return "++";
+}
+
+bool LanaiInstPrinter::printMemoryLoadIncrement(const MCInst *MI,
+                                                raw_ostream &Ostream,
+                                                StringRef Opcode,
+                                                int AddOffset) {
+  if (isPreIncrementForm(MI, AddOffset)) {
+    Ostream << "\t" << Opcode << "\t[" << decIncOperator(MI) << "%"
+            << getRegisterName(MI->getOperand(1).getReg()) << "], %"
+            << getRegisterName(MI->getOperand(0).getReg());
+    return true;
+  }
+  if (isPostIncrementForm(MI, AddOffset)) {
+    Ostream << "\t" << Opcode << "\t[%"
+            << getRegisterName(MI->getOperand(1).getReg()) << decIncOperator(MI)
+            << "], %" << getRegisterName(MI->getOperand(0).getReg());
+    return true;
+  }
+  return false;
+}
+
+bool LanaiInstPrinter::printMemoryStoreIncrement(const MCInst *MI,
+                                                 raw_ostream &Ostream,
+                                                 StringRef Opcode,
+                                                 int AddOffset) {
+  if (isPreIncrementForm(MI, AddOffset)) {
+    Ostream << "\t" << Opcode << "\t%"
+            << getRegisterName(MI->getOperand(0).getReg()) << ", ["
+            << decIncOperator(MI) << "%"
+            << getRegisterName(MI->getOperand(1).getReg()) << "]";
+    return true;
+  }
+  if (isPostIncrementForm(MI, AddOffset)) {
+    Ostream << "\t" << Opcode << "\t%"
+            << getRegisterName(MI->getOperand(0).getReg()) << ", [%"
+            << getRegisterName(MI->getOperand(1).getReg()) << decIncOperator(MI)
+            << "]";
+    return true;
+  }
+  return false;
+}
+
+bool LanaiInstPrinter::printAlias(const MCInst *MI, raw_ostream &Ostream) {
+  switch (MI->getOpcode()) {
+  case Lanai::LDW_RI:
+    // ld 4[*%rN], %rX => ld [++imm], %rX
+    // ld -4[*%rN], %rX => ld [--imm], %rX
+    // ld 4[%rN*], %rX => ld [imm++], %rX
+    // ld -4[%rN*], %rX => ld [imm--], %rX
+    return printMemoryLoadIncrement(MI, Ostream, "ld", 4);
+  case Lanai::LDHs_RI:
+    return printMemoryLoadIncrement(MI, Ostream, "ld.h", 2);
+  case Lanai::LDHz_RI:
+    return printMemoryLoadIncrement(MI, Ostream, "uld.h", 2);
+  case Lanai::LDBs_RI:
+    return printMemoryLoadIncrement(MI, Ostream, "ld.b", 1);
+  case Lanai::LDBz_RI:
+    return printMemoryLoadIncrement(MI, Ostream, "uld.b", 1);
+  case Lanai::SW_RI:
+    // st %rX, 4[*%rN] => st %rX, [++imm]
+    // st %rX, -4[*%rN] => st %rX, [--imm]
+    // st %rX, 4[%rN*] => st %rX, [imm++]
+    // st %rX, -4[%rN*] => st %rX, [imm--]
+    return printMemoryStoreIncrement(MI, Ostream, "st", 4);
+  case Lanai::STH_RI:
+    return printMemoryStoreIncrement(MI, Ostream, "st.h", 2);
+  case Lanai::STB_RI:
+    return printMemoryStoreIncrement(MI, Ostream, "st.b", 1);
+  default:
+    return false;
+  }
+}
+
+void LanaiInstPrinter::printInst(const MCInst *MI, raw_ostream &Ostream,
+                                 StringRef Annotation,
+                                 const MCSubtargetInfo &STI) {
+  if (!printAlias(MI, Ostream) && !printAliasInstr(MI, Ostream))
+    printInstruction(MI, Ostream);
+  printAnnotation(Ostream, Annotation);
+}
+
+static void printExpr(const MCAsmInfo &MAI, const MCExpr &Expr,
+                      raw_ostream &Ostream) {
+  const MCExpr *SRE;
+
+  if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(&Expr))
+    SRE = dyn_cast<LanaiMCExpr>(BE->getLHS());
+  else if (isa<LanaiMCExpr>(&Expr)) {
+    SRE = dyn_cast<LanaiMCExpr>(&Expr);
+  } else {
+    SRE = dyn_cast<MCSymbolRefExpr>(&Expr);
+  }
+  assert(SRE && "Unexpected MCExpr type.");
+
+  SRE->print(Ostream, &MAI);
+}
+
+void LanaiInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
+                                    raw_ostream &Ostream,
+                                    const char *Modifier) {
+  assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isReg())
+    Ostream << "%" << getRegisterName(Op.getReg());
+  else if (Op.isImm())
+    Ostream << formatHex(Op.getImm());
+  else {
+    assert(Op.isExpr() && "Expected an expression");
+    printExpr(MAI, *Op.getExpr(), Ostream);
+  }
+}
+
+void LanaiInstPrinter::printMemImmOperand(const MCInst *MI, unsigned OpNo,
+                                          raw_ostream &Ostream) {
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isImm()) {
+    Ostream << '[' << formatHex(Op.getImm()) << ']';
+  } else {
+    // Symbolic operand will be lowered to immediate value by linker
+    assert(Op.isExpr() && "Expected an expression");
+    Ostream << '[';
+    printExpr(MAI, *Op.getExpr(), Ostream);
+    Ostream << ']';
+  }
+}
+
+void LanaiInstPrinter::printHi16ImmOperand(const MCInst *MI, unsigned OpNo,
+                                           raw_ostream &Ostream) {
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isImm()) {
+    Ostream << formatHex(Op.getImm() << 16);
+  } else {
+    // Symbolic operand will be lowered to immediate value by linker
+    assert(Op.isExpr() && "Expected an expression");
+    printExpr(MAI, *Op.getExpr(), Ostream);
+  }
+}
+
+void LanaiInstPrinter::printHi16AndImmOperand(const MCInst *MI, unsigned OpNo,
+                                              raw_ostream &Ostream) {
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isImm()) {
+    Ostream << formatHex((Op.getImm() << 16) | 0xffff);
+  } else {
+    // Symbolic operand will be lowered to immediate value by linker
+    assert(Op.isExpr() && "Expected an expression");
+    printExpr(MAI, *Op.getExpr(), Ostream);
+  }
+}
+
+void LanaiInstPrinter::printLo16AndImmOperand(const MCInst *MI, unsigned OpNo,
+                                              raw_ostream &Ostream) {
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isImm()) {
+    Ostream << formatHex(0xffff0000 | Op.getImm());
+  } else {
+    // Symbolic operand will be lowered to immediate value by linker
+    assert(Op.isExpr() && "Expected an expression");
+    printExpr(MAI, *Op.getExpr(), Ostream);
+  }
+}
+
+static void printMemoryBaseRegister(raw_ostream &Ostream, const unsigned AluCode,
+                             const MCOperand &RegOp) {
+  assert(RegOp.isReg() && "Register operand expected");
+  Ostream << "[";
+  if (LPAC::isPreOp(AluCode))
+    Ostream << "*";
+  Ostream << "%" << LanaiInstPrinter::getRegisterName(RegOp.getReg());
+  if (LPAC::isPostOp(AluCode))
+    Ostream << "*";
+  Ostream << "]";
+}
+
+template <unsigned SizeInBits>
+static void printMemoryImmediateOffset(const MCAsmInfo &MAI,
+                                       const MCOperand &OffsetOp,
+                                       raw_ostream &Ostream) {
+  assert((OffsetOp.isImm() || OffsetOp.isExpr()) && "Immediate expected");
+  if (OffsetOp.isImm()) {
+    assert(isInt<SizeInBits>(OffsetOp.getImm()) && "Constant value truncated");
+    Ostream << OffsetOp.getImm();
+  } else
+    printExpr(MAI, *OffsetOp.getExpr(), Ostream);
+}
+
+void LanaiInstPrinter::printMemRiOperand(const MCInst *MI, int OpNo,
+                                         raw_ostream &Ostream,
+                                         const char *Modifier) {
+  const MCOperand &RegOp = MI->getOperand(OpNo);
+  const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
+  const MCOperand &AluOp = MI->getOperand(OpNo + 2);
+  const unsigned AluCode = AluOp.getImm();
+
+  // Offset
+  printMemoryImmediateOffset<16>(MAI, OffsetOp, Ostream);
+
+  // Register
+  printMemoryBaseRegister(Ostream, AluCode, RegOp);
+}
+
+void LanaiInstPrinter::printMemRrOperand(const MCInst *MI, int OpNo,
+                                         raw_ostream &Ostream,
+                                         const char *Modifier) {
+  const MCOperand &RegOp = MI->getOperand(OpNo);
+  const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
+  const MCOperand &AluOp = MI->getOperand(OpNo + 2);
+  const unsigned AluCode = AluOp.getImm();
+  assert(OffsetOp.isReg() && RegOp.isReg() && "Registers expected.");
+
+  // [ Base OP Offset ]
+  Ostream << "[";
+  if (LPAC::isPreOp(AluCode))
+    Ostream << "*";
+  Ostream << "%" << getRegisterName(RegOp.getReg());
+  if (LPAC::isPostOp(AluCode))
+    Ostream << "*";
+  Ostream << " " << LPAC::lanaiAluCodeToString(AluCode) << " ";
+  Ostream << "%" << getRegisterName(OffsetOp.getReg());
+  Ostream << "]";
+}
+
+void LanaiInstPrinter::printMemSplsOperand(const MCInst *MI, int OpNo,
+                                           raw_ostream &Ostream,
+                                           const char *Modifier) {
+  const MCOperand &RegOp = MI->getOperand(OpNo);
+  const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
+  const MCOperand &AluOp = MI->getOperand(OpNo + 2);
+  const unsigned AluCode = AluOp.getImm();
+
+  // Offset
+  printMemoryImmediateOffset<10>(MAI, OffsetOp, Ostream);
+
+  // Register
+  printMemoryBaseRegister(Ostream, AluCode, RegOp);
+}
+
+void LanaiInstPrinter::printCCOperand(const MCInst *MI, int OpNo,
+                                      raw_ostream &Ostream) {
+  const int CC = static_cast<const int>(MI->getOperand(OpNo).getImm());
+  Ostream << lanaiCondCodeToString(static_cast<LPCC::CondCode>(CC));
+}