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

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 00e007d54ef43d6de426954c9cce01ed66b8dac7..7645addc6971831a859401264bb3e2f0bad81962 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -627,10 +627,13 @@ class RepresentationSelector {
       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);