Reorder switch clauses using newly-introduced execution counters in

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index 78f44ab23eefa573b7983680ff3389c4768530df..34e33a744b19c4f1dc3a35515ace9f4bfdbd30c5 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -1064,10 +1064,35 @@ void FullCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
 
   // Compile all the case bodies.
   for (int i = 0; i < clauses->length(); i++) {
-    Comment cmnt(masm_, "[ Case body");
     CaseClause* clause = clauses->at(i);
     __ bind(clause->body_target());
     PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
+
+    // Initialize counter
+    { Comment cmnt(masm_, "[ Case hit counter");
+      Handle<JSGlobalPropertyCell> cell =
+          isolate()->factory()->NewJSGlobalPropertyCell(
+              Handle<Object>(Smi::FromInt(0), isolate()));
+      RecordTypeFeedbackCell(clause->CounterId(), cell);
+
+      // Increment counter
+      Label ok;
+      MemOperand counter =
+          FieldMemOperand(a1, JSGlobalPropertyCell::kValueOffset);
+
+      __ LoadHeapObject(a1, cell);
+      __ lw(a2, counter);
+      __ Addu(a2, a2, Operand(Smi::FromInt(1)));
+      __ SmiTagCheckOverflow(a2, a3);
+      __ BranchOnNoOverflow(&ok, a3);
+
+      // Decrement on overflow
+      __ Subu(a2, a2, Operand(Smi::FromInt(1)));
+      __ bind(&ok);
+      __ sw(a2, counter);
+    }
+
+    Comment cmnt(masm_, "[ Case body");
     VisitStatements(clause->statements());
   }