Reorder switch clauses using newly-introduced execution counters in

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 9c08ef3033de13d7a74c3964aea2f50877220b2e..fa96a41925434fd63cd19377e7104c96ba376663 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -1013,10 +1013,34 @@ 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;
+      Operand counter = FieldOperand(ebx, JSGlobalPropertyCell::kValueOffset);
+
+      __ LoadHeapObject(ebx, cell);
+      __ mov(ecx, counter);
+      __ AssertSmi(ecx);
+      __ add(ecx, Immediate(Smi::FromInt(1)));
+      __ j(no_overflow, &ok, Label::kNear);
+
+      // Decrement on overflow
+      __ sub(ecx, Immediate(Smi::FromInt(1)));
+      __ bind(&ok);
+      __ mov(counter, ecx);
+    }
+
+    Comment cmnt(masm_, "[ Case body");
     VisitStatements(clause->statements());
   }