Revert "Use Representation::Integer32() for smi types on 32-bit-tagged systems."

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8722 matching lines @@
   if (join != NULL) return ast_context()->ReturnValue(Pop());
 }
 
 
 HInstruction* HOptimizedGraphBuilder::BuildIncrement(
     bool returns_original_input,
     CountOperation* expr) {
   // The input to the count operation is on top of the expression stack.
   Representation rep = Representation::FromType(expr->type());
   if (rep.IsNone() || rep.IsTagged()) {
-    rep = Representation::FromType(Type::Smi());
+    rep = Representation::Smi();
   }
 
   if (returns_original_input) {
     // We need an explicit HValue representing ToNumber(input).  The
     // actual HChange instruction we need is (sometimes) added in a later
     // phase, so it is not available now to be used as an input to HAdd and
     // as the return value.
     HInstruction* number_input = AddUncasted<HForceRepresentation>(Pop(), rep);
     if (!rep.IsDouble()) {
       number_input->SetFlag(HInstruction::kFlexibleRepresentation);
@@ skipping 229 matching lines @@
        (right_const->Integer32Value() & 0x1f) != 0) {
       return false;
     }
   }
   return true;
 }
 
 
 HValue* HGraphBuilder::EnforceNumberType(HValue* number,
                                          Type* expected) {
-  return AddUncasted<HForceRepresentation>(
-      number, Representation::FromType(expected));
+  if (expected->Is(Type::Smi())) {
+    return AddUncasted<HForceRepresentation>(number, Representation::Smi());
+  }
+  if (expected->Is(Type::Signed32())) {
+    return AddUncasted<HForceRepresentation>(number,
+                                             Representation::Integer32());
+  }
+  return number;
 }
 
 
 HValue* HGraphBuilder::TruncateToNumber(HValue* value, Type** expected) {
   if (value->IsConstant()) {
     HConstant* constant = HConstant::cast(value);
     Maybe<HConstant*> number = constant->CopyToTruncatedNumber(zone());
     if (number.has_value) {
       *expected = Type::Number(zone());
       return AddInstruction(number.value);
@@ skipping 2290 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal