implement the null function for the Mips32 subzero compiler

src/IceTargetLoweringMIPS32.h

 //===- subzero/src/IceTargetLoweringMIPS32.h - MIPS32 lowering ---*- C++-*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringMIPS32 class, which implements the
@@ skipping 38 matching lines @@
   }
   size_t typeWidthInBytesOnStack(Type Ty) const override {
     // Round up to the next multiple of 4 bytes.  In particular, i1,
     // i8, and i16 are rounded up to 4 bytes.
     return (typeWidthInBytes(Ty) + 3) & ~3;
   }
   void emitVariable(const Variable *Var) const override;
 
   const char *getConstantPrefix() const final { return ""; }
   void emit(const ConstantUndef *C) const final {
-    llvm::report_fatal_error("Not yet implemented");
+    llvm::report_fatal_error("Not yet implemented: constantundef");
   }
   void emit(const ConstantInteger32 *C) const final {
-    llvm::report_fatal_error("Not yet implemented");
+    llvm::report_fatal_error("Not yet implemented: constantinteger32");
   }
   void emit(const ConstantInteger64 *C) const final {
-    llvm::report_fatal_error("Not yet implemented");
+    llvm::report_fatal_error("Not yet implemented: constantinteger64");
   }
   void emit(const ConstantFloat *C) const final {
-    llvm::report_fatal_error("Not yet implemented");
+    llvm::report_fatal_error("Not yet implemented: constantfloat");
   }
   void emit(const ConstantDouble *C) const final {
-    llvm::report_fatal_error("Not yet implemented");
+    llvm::report_fatal_error("Not yet implemented: constantdouble");
+  }
+
+  void _ret(Variable *LR, Variable *Src0 = nullptr) {

[jvoung (off chromium), 2015/06/12 19:39:13]

LR -> RA

+    Context.insert(InstMIPS32Ret::create(Func, LR, Src0));
   }
 
   void lowerArguments() override;
   void addProlog(CfgNode *Node) override;
   void addEpilog(CfgNode *Node) override;
 
 protected:
   explicit TargetMIPS32(Cfg *Func);
 
   void postLower() override;
@@ skipping 58 matching lines @@
 
 private:
   void lowerGlobal(const VariableDeclaration &Var) const;
   ~TargetDataMIPS32() override {}
   template <typename T> static void emitConstantPool(GlobalContext *Ctx);
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGMIPS32_H