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

src/compiler/machine-node-factory.h

 // 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.
 
 #ifndef V8_COMPILER_MACHINE_NODE_FACTORY_H_
 #define V8_COMPILER_MACHINE_NODE_FACTORY_H_
 
 #ifdef USE_SIMULATOR
 #define MACHINE_ASSEMBLER_SUPPORTS_CALL_C 0
 #else
@@ skipping 262 matching lines @@
     return NEW_NODE_2(MACHINE()->Int64LessThan(), a, b);
   }
   Node* Int64LessThanOrEqual(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Int64LessThanOrEqual(), a, b);
   }
   Node* Int64GreaterThan(Node* a, Node* b) { return Int64LessThan(b, a); }
   Node* Int64GreaterThanOrEqual(Node* a, Node* b) {
     return Int64LessThanOrEqual(b, a);
   }
 
+  // TODO(turbofan): What is this used for?
   Node* ConvertIntPtrToInt32(Node* a) {
-    return kPointerSize == 8 ? NEW_NODE_1(MACHINE()->ConvertInt64ToInt32(), a)
+    return kPointerSize == 8 ? NEW_NODE_1(MACHINE()->TruncateInt64ToInt32(), a)
                              : a;
   }
   Node* ConvertInt32ToIntPtr(Node* a) {
-    return kPointerSize == 8 ? NEW_NODE_1(MACHINE()->ConvertInt32ToInt64(), a)
+    return kPointerSize == 8 ? NEW_NODE_1(MACHINE()->ChangeInt32ToInt64(), a)
                              : a;
   }
 
 #define INTPTR_BINOP(prefix, name)                     \
   Node* IntPtr##name(Node* a, Node* b) {               \
     return kPointerSize == 8 ? prefix##64##name(a, b)  \
                              : prefix##32##name(a, b); \
   }
 
   INTPTR_BINOP(Int, Add);
@@ skipping 33 matching lines @@
   }
   Node* Float64LessThanOrEqual(Node* a, Node* b) {
     return NEW_NODE_2(MACHINE()->Float64LessThanOrEqual(), a, b);
   }
   Node* Float64GreaterThan(Node* a, Node* b) { return Float64LessThan(b, a); }
   Node* Float64GreaterThanOrEqual(Node* a, Node* b) {
     return Float64LessThanOrEqual(b, a);
   }
 
   // Conversions.
-  Node* ConvertInt32ToInt64(Node* a) {
-    return NEW_NODE_1(MACHINE()->ConvertInt32ToInt64(), a);
-  }
-  Node* ConvertInt64ToInt32(Node* a) {
-    return NEW_NODE_1(MACHINE()->ConvertInt64ToInt32(), a);
-  }
   Node* ChangeInt32ToFloat64(Node* a) {
     return NEW_NODE_1(MACHINE()->ChangeInt32ToFloat64(), a);
   }
   Node* ChangeUint32ToFloat64(Node* a) {
     return NEW_NODE_1(MACHINE()->ChangeUint32ToFloat64(), a);
   }
   Node* ChangeFloat64ToInt32(Node* a) {
     return NEW_NODE_1(MACHINE()->ChangeFloat64ToInt32(), a);
   }
   Node* ChangeFloat64ToUint32(Node* a) {
     return NEW_NODE_1(MACHINE()->ChangeFloat64ToUint32(), a);
   }
+  Node* ChangeInt32ToInt64(Node* a) {
+    return NEW_NODE_1(MACHINE()->ChangeInt32ToInt64(), a);
+  }
+  Node* ChangeUint32ToUint64(Node* a) {
+    return NEW_NODE_1(MACHINE()->ChangeUint32ToUint64(), a);
+  }
+  Node* TruncateInt64ToInt32(Node* a) {
+    return NEW_NODE_1(MACHINE()->TruncateInt64ToInt32(), a);
+  }
 
 #ifdef MACHINE_ASSEMBLER_SUPPORTS_CALL_C
   // Call to C.
   Node* CallC(Node* function_address, MachineType return_type,
               MachineType* arg_types, Node** args, int n_args) {
     CallDescriptor* descriptor = Linkage::GetSimplifiedCDescriptor(
         ZONE(), n_args, return_type, arg_types);
     Node** passed_args =
         static_cast<Node**>(alloca((n_args + 1) * sizeof(args[0])));
     passed_args[0] = function_address;
@@ skipping 11 matching lines @@
 #undef NEW_NODE_3
 #undef MACHINE
 #undef COMMON
 #undef ZONE
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_NODE_FACTORY_H_