[turbofan] Add proper conversion operators for int32<->int64.

src/compiler/simplified-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/simplified-lowering.h"
 
 #include <deque>
 #include <queue>
 
 #include "src/compiler/common-operator.h"
@@ skipping 609 matching lines @@
       case IrOpcode::kWord64And:
       case IrOpcode::kWord64Or:
       case IrOpcode::kWord64Xor:
       case IrOpcode::kWord64Shl:
       case IrOpcode::kWord64Shr:
       case IrOpcode::kWord64Sar:
         return VisitBinop(node, kRepWord64, kRepWord64);
       case IrOpcode::kWord64Equal:
         return VisitBinop(node, kRepWord64, kRepBit);
 
-      case IrOpcode::kConvertInt32ToInt64:
+      case IrOpcode::kChangeInt32ToInt64:
         return VisitUnop(node, kTypeInt32 | kRepWord32,
-                         kTypeInt32 | kRepWord64);
-      case IrOpcode::kConvertInt64ToInt32:
+                         kTypeInt64 | kRepWord64);

[Jarin, 2014/08/19 08:46:36]

Why did you change the type to kTypeInt64 here?

[Benedikt Meurer, 2014/08/19 08:48:07]

Because the output of ChangeInt32ToInt64 is an int64.

+      case IrOpcode::kChangeUint32ToUint64:
+        return VisitUnop(node, kTypeUint32 | kRepWord32,
+                         kTypeUint64 | kRepWord64);
+      case IrOpcode::kTruncateInt64ToInt32:
         return VisitUnop(node, kTypeInt64 | kRepWord64,
                          kTypeInt32 | kRepWord32);
 
       case IrOpcode::kChangeInt32ToFloat64:
         return VisitUnop(node, kTypeInt32 | kRepWord32,
                          kTypeInt32 | kRepFloat64);
       case IrOpcode::kChangeUint32ToFloat64:
         return VisitUnop(node, kTypeUint32 | kRepWord32,
                          kTypeUint32 | kRepFloat64);
       case IrOpcode::kChangeFloat64ToInt32:
@@ skipping 352 matching lines @@
       break;
     default:
       UNREACHABLE();
       break;
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8