Implements simple returns and call args for Mips.

src/IceInstMIPS32.h

Index: src/IceInstMIPS32.h
diff --git a/src/IceInstMIPS32.h b/src/IceInstMIPS32.h
index 1c4863f5cf853f74191fb4f5993faae158b7f555..fe3e274a83a9d0ad253e0d2a83284031c4d272cd 100644
--- a/src/IceInstMIPS32.h
+++ b/src/IceInstMIPS32.h
@@ -26,6 +26,84 @@ namespace Ice {
 
 class TargetMIPS32;
 
+/// OperandMips32 extends the Operand hierarchy.
+//
+class OperandMIPS32 : public Operand {
+  OperandMIPS32() = delete;
+  OperandMIPS32(const OperandMIPS32 &) = delete;
+  OperandMIPS32 &operator=(const OperandMIPS32 &) = delete;
+
+public:
+  enum OperandKindMIPS32 {
+    k__Start = Operand::kTarget,
+    kMem,
+  };
+
+  using Operand::dump;
+  void dump(const Cfg *, Ostream &Str) const override {
+    if (BuildDefs::dump())
+      Str << "<OperandMIPS32>";
+  }
+protected:
+  OperandMIPS32(OperandKindMIPS32 Kind, Type Ty)
+      : Operand(static_cast<OperandKind>(Kind), Ty) {}
+};
+
+class OperandMIPS32Mem : public OperandMIPS32 {
+  OperandMIPS32Mem() = delete;
+  OperandMIPS32Mem(const OperandMIPS32Mem &) = delete;
+  OperandMIPS32Mem &operator=(const OperandMIPS32Mem &) = delete;
+
+public:
+  /// Memory operand addressing mode.
+  /// The enum value also carries the encoding.
+  // TODO(jvoung): unify with the assembler.
+  enum AddrMode { Offset };
+
+  /// NOTE: The Variable-typed operands have to be registers.
+  ///
+  /// Reg + Imm. The Immediate actually has a limited number of bits
+  /// for encoding, so check canHoldOffset first. It cannot handle
+  /// general Constant operands like ConstantRelocatable, since a relocatable
+  /// can potentially take up too many bits.
+  static OperandMIPS32Mem *create(Cfg *Func, Type Ty, Variable *Base,
+                                  ConstantInteger32 *ImmOffset,
+                                  AddrMode Mode = Offset) {
+    return new (Func->allocate<OperandMIPS32Mem>())
+        OperandMIPS32Mem(Func, Ty, Base, ImmOffset, Mode);
+  }
+
+  Variable *getBase() const { return Base; }
+  ConstantInteger32 *getOffset() const { return ImmOffset; }
+  AddrMode getAddrMode() const { return Mode; }
+
+  void emit(const Cfg *Func) const override;
+  using OperandMIPS32::dump;
+
+  static bool classof(const Operand *Operand) {
+    return Operand->getKind() == static_cast<OperandKind>(kMem);
+  }
+
+  /// Return true if a load/store instruction for an element of type Ty
+  /// can encode the Offset directly in the immediate field of the 32-bit
+  /// MIPS instruction. For some types, if the load is Sign extending, then
+  /// the range is reduced.
+  static bool canHoldOffset(Type Ty, bool SignExt, int32_t Offset);
+
+  void dump(const Cfg *Func, Ostream &Str) const override {
+    (void)Func;
+    (void)Str;
+  }
+
+private:
+  OperandMIPS32Mem(Cfg *Func, Type Ty, Variable *Base,
+                   ConstantInteger32 *ImmOffset, AddrMode Mode);
+
+  Variable *Base;
+  ConstantInteger32 *ImmOffset;
+  AddrMode Mode;
+};
+
 /// Base class for Mips instructions.
 class InstMIPS32 : public InstTarget {
   InstMIPS32() = delete;
@@ -33,12 +111,28 @@ class InstMIPS32 : public InstTarget {
   InstMIPS32 &operator=(const InstMIPS32 &) = delete;
 
 public:
-  enum InstKindMIPS32 { k__Start = Inst::Target, Ret };
+  enum InstKindMIPS32 {
+    k__Start = Inst::Target,
+    Addiu,
+    La,
+    Lui,
+    Mov, // actually a pseudo op for addi rd, rs, 0
+    Ori,
+    Ret
+  };
 
   static const char *getWidthString(Type Ty);
 
   void dump(const Cfg *Func) const override;
 
+  void dumpOpcode(Ostream &Str, const char *Opcode, Type Ty) const {
+    Str << Opcode << "." << Ty;
+  }
+
+  /// Shared emit routines for common forms of instructions.
+  static void emitUnaryopGPR(const char *Opcode, const InstMIPS32 *Inst,
+                             const Cfg *Func);
+
 protected:
   InstMIPS32(Cfg *Func, InstKindMIPS32 Kind, SizeT Maxsrcs, Variable *Dest)
       : InstTarget(Func, static_cast<InstKind>(Kind), Maxsrcs, Dest) {}
@@ -75,6 +169,166 @@ private:
   InstMIPS32Ret(Cfg *Func, Variable *RA, Variable *Source);
 };
 
+/// Instructions of the form x := op(y).
+template <InstMIPS32::InstKindMIPS32 K>
+class InstMIPS32UnaryopGPR : public InstMIPS32 {
+  InstMIPS32UnaryopGPR() = delete;
+  InstMIPS32UnaryopGPR(const InstMIPS32UnaryopGPR &) = delete;
+  InstMIPS32UnaryopGPR &operator=(const InstMIPS32UnaryopGPR &) = delete;
+
+public:
+  static InstMIPS32UnaryopGPR *create(Cfg *Func, Variable *Dest, Operand *Src) {
+    return new (Func->allocate<InstMIPS32UnaryopGPR>())
+        InstMIPS32UnaryopGPR(Func, Dest, Src);
+  }
+  void emit(const Cfg *Func) const override {
+    if (!BuildDefs::dump())
+      return;
+    emitUnaryopGPR(Opcode, this, Func);
+  }
+  void emitIAS(const Cfg *Func) const override {
+    (void)Func;
+    llvm_unreachable("Not yet implemented");
+  }
+  void dump(const Cfg *Func) const override {
+    if (!BuildDefs::dump())
+      return;
+    Ostream &Str = Func->getContext()->getStrDump();
+    dumpOpcode(Str, Opcode, getDest()->getType());
+    Str << " ";
+    dumpDest(Func);
+    Str << ", ";
+    dumpSources(Func);
+  }
+  static bool classof(const Inst *Inst) { return isClassof(Inst, K); }
+
+protected:
+  InstMIPS32UnaryopGPR(Cfg *Func, Variable *Dest, Operand *Src)
+      : InstMIPS32(Func, K, 1, Dest) {
+    addSource(Src);
+  }
+
+private:
+  static const char *Opcode;
+};
+
+template <InstMIPS32::InstKindMIPS32 K, bool Signed = false>
+class InstMIPS32Imm16 : public InstMIPS32 {
+  InstMIPS32Imm16() = delete;
+  InstMIPS32Imm16(const InstMIPS32Imm16 &) = delete;
+  InstMIPS32Imm16 &operator=(const InstMIPS32Imm16 &) = delete;
+
+public:
+  static InstMIPS32Imm16 *create(Cfg *Func, Variable *Dest, Operand *Source,
+                                 uint32_t Imm) {
+    return new (Func->allocate<InstMIPS32Imm16>())
+        InstMIPS32Imm16(Func, Dest, Source, Imm);
+  }
+
+  static InstMIPS32Imm16 *create(Cfg *Func, Variable *Dest, uint32_t Imm) {
+    return new (Func->allocate<InstMIPS32Imm16>())
+        InstMIPS32Imm16(Func, Dest, Imm);
+  }
+
+  void emit(const Cfg *Func) const override {
+    if (!BuildDefs::dump())
+      return;
+    Ostream &Str = Func->getContext()->getStrEmit();
+    Str << "\t" << Opcode << "\t";
+    getDest()->emit(Func);
+    if (getSrcSize() > 0) {
+      Str << ", ";
+      getSrc(0)->emit(Func);
+    }
+    Str << ", ";
+    if (Signed)
+      Str << (int32_t)Imm;
+    else
+      Str << Imm;
+    Str << "\n";
+  }
+
+  void emitIAS(const Cfg *Func) const override {
+    (void)Func;
+    llvm_unreachable("Not yet implemented");
+  }
+  void dump(const Cfg *Func) const override {
+    if (!BuildDefs::dump())
+      return;
+    Ostream &Str = Func->getContext()->getStrDump();
+    Str << " ";
+    Str << "\t" << Opcode << "\t";
+    dumpDest(Func);
+    Str << ", ";
+    dumpSources(Func);
+    if (Signed)
+      Str << (int32_t)Imm;
+    else
+      Str << Imm;
+    Str << "\n";
+  }
+
+  static bool classof(const Inst *Inst) { return isClassof(Inst, K); }
+
+private:
+  InstMIPS32Imm16(Cfg *Func, Variable *Dest, Operand *Source, uint32_t Imm)
+      : InstMIPS32(Func, K, 1, Dest), Imm(Imm){
+    addSource(Source);
+  }
+
+  InstMIPS32Imm16(Cfg *Func, Variable *Dest, uint32_t Imm)
+      : InstMIPS32(Func, K, 0, Dest), Imm(Imm) {
+  }
+
+  static const char *Opcode;
+
+  const uint32_t Imm;
+};
+
+typedef InstMIPS32Imm16<InstMIPS32::Addiu, true> InstMIPS32Addiu;
+typedef InstMIPS32Imm16<InstMIPS32::Lui> InstMIPS32Lui;
+typedef InstMIPS32UnaryopGPR<InstMIPS32::La> InstMIPS32La;
+typedef InstMIPS32Imm16<InstMIPS32::Ori> InstMIPS32Ori;
+
+/// Handles (some of) vmov's various formats.
+class InstMIPS32Mov final : public InstMIPS32 {
+  InstMIPS32Mov() = delete;
+  InstMIPS32Mov(const InstMIPS32Mov &) = delete;
+  InstMIPS32Mov &operator=(const InstMIPS32Mov &) = delete;
+
+public:
+  static InstMIPS32Mov *create(Cfg *Func, Variable *Dest, Operand *Src) {
+    return new (Func->allocate<InstMIPS32Mov>()) InstMIPS32Mov(Func, Dest, Src);
+  }
+  bool isRedundantAssign() const override {
+    return !isMultiDest() && !isMultiSource() &&
+           checkForRedundantAssign(getDest(), getSrc(0));
+  }
+  //bool isSimpleAssign() const override { return true; }
+  void emit(const Cfg *Func) const override;
+  void emitIAS(const Cfg *Func) const override;
+  void dump(const Cfg *Func) const override;
+  static bool classof(const Inst *Inst) { return isClassof(Inst, Mov); }
+
+  bool isMultiDest() const { return DestHi != nullptr; }
+
+  bool isMultiSource() const {
+    assert(getSrcSize() == 1 || getSrcSize() == 2);
+    return getSrcSize() == 2;
+  }
+
+  Variable *getDestHi() const { return DestHi; }
+
+private:
+  InstMIPS32Mov(Cfg *Func, Variable *Dest, Operand *Src);
+
+  void emitMultiDestSingleSource(const Cfg *Func) const;
+  void emitSingleDestMultiSource(const Cfg *Func) const;
+  void emitSingleDestSingleSource(const Cfg *Func) const;
+
+  Variable *DestHi = nullptr;
+};
+
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTMIPS32_H