[SubZero] Implement lowerSwitch for MIPS

src/IceInstMIPS32.cpp

 //===- subzero/src/IceInstMips32.cpp - Mips32 instruction implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
@@ skipping 412 matching lines @@
          "\t";
   RA->emit(Func);
 }
 
 void InstMIPS32Br::emit(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrEmit();
   Str << "\t"
          "b" << InstMIPS32CondAttributes[Predicate].EmitString << "\t";
-  if (Label) {
-    Str << Label->getLabelName();
+  if (Label != nullptr) {
+    getSrc(0)->emit(Func);
+    Str << ", ";
+    getSrc(1)->emit(Func);
+    Str << ", " << Label->getLabelName();
   } else {
     if (isUnconditionalBranch()) {
       Str << getTargetFalse()->getAsmName();
     } else {
       switch (Predicate) {
       default:
         break;
       case CondMIPS32::EQ:
       case CondMIPS32::NE: {
         getSrc(0)->emit(Func);
@@ skipping 23 matching lines @@
   }
 }
 
 void InstMIPS32Br::dump(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrDump();
   Str << "\t"
          "b" << InstMIPS32CondAttributes[Predicate].EmitString << "\t";
 
-  if (Label) {
-    Str << Label->getLabelName();
+  if (Label != nullptr) {
+    getSrc(0)->dump(Func);
+    Str << ", ";
+    getSrc(1)->dump(Func);
+    Str << ", " << Label->getLabelName();
   } else {
     if (isUnconditionalBranch()) {
       Str << getTargetFalse()->getAsmName();
     } else {
       dumpSources(Func);
       Str << ", ";
       Str << getTargetFalse()->getAsmName();
       if (getTargetTrue()) {
         Str << "\n\t"
             << "b"
@@ skipping 248 matching lines @@
     getSrc(0)->emit(Func);
     return;
   }
 
   // stack to stack
   llvm::report_fatal_error("mov cant copy stack to stack.");
 }
 
 } // end of namespace MIPS32
 } // end of namespace Ice