WIP: Add first-class support for float32 representations.

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 e3ddf5c461d6dadc0f63736d1d3d47855873c2cf..9a696c86a8dd1e1fa5aa9cd758104483bbdb8fe2 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -692,30 +692,43 @@ class RepresentationSelector {
       case IrOpcode::kWord64Equal:
         return VisitBinop(node, kRepWord64, kRepBit);
 
+      case IrOpcode::kChangeFloat32ToFloat64:
+        return VisitUnop(node, kTypeNumber | kRepFloat32,
+                         kTypeNumber | kRepFloat64);
+      case IrOpcode::kChangeFloat64ToFloat32:
+        return VisitUnop(node, kTypeNumber | kRepFloat64,
+                         kTypeNumber | kRepFloat32);
+      case IrOpcode::kChangeFloat64ToInt32:
+        return VisitUnop(node, kTypeInt32 | kRepFloat64,
+                         kTypeInt32 | kRepWord32);
+      case IrOpcode::kChangeFloat64ToUint32:
+        return VisitUnop(node, kTypeUint32 | kRepFloat64,
+                         kTypeUint32 | kRepWord32);
+
+      case IrOpcode::kChangeInt32ToFloat64:
+        return VisitUnop(node, kTypeInt32 | kRepWord32,
+                         kTypeInt32 | kRepFloat64);
       case IrOpcode::kChangeInt32ToInt64:
         return VisitUnop(node, kTypeInt32 | kRepWord32,
                          kTypeInt32 | kRepWord64);
+      case IrOpcode::kChangeUint32ToFloat64:
+        return VisitUnop(node, kTypeUint32 | kRepWord32,
+                         kTypeUint32 | kRepFloat64);
       case IrOpcode::kChangeUint32ToUint64:
         return VisitUnop(node, kTypeUint32 | kRepWord32,
                          kTypeUint32 | kRepWord64);
+
+      case IrOpcode::kTruncateFloat64ToFloat32:
+        return VisitUnop(node, kTypeNumber | kRepFloat64,
+                         kTypeNumber | kRepFloat32);
+      case IrOpcode::kTruncateFloat64ToInt32:
+        return VisitUnop(node, kTypeNumber | kRepFloat64,
+                         kTypeInt32 | kRepWord32);
       case IrOpcode::kTruncateInt64ToInt32:
         // TODO(titzer): Is kTypeInt32 correct here?
         return VisitUnop(node, kTypeInt32 | 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:
-        return VisitUnop(node, kTypeInt32 | kRepFloat64,
-                         kTypeInt32 | kRepWord32);
-      case IrOpcode::kChangeFloat64ToUint32:
-        return VisitUnop(node, kTypeUint32 | kRepFloat64,
-                         kTypeUint32 | kRepWord32);
-
       case IrOpcode::kFloat64Add:
       case IrOpcode::kFloat64Sub:
       case IrOpcode::kFloat64Mul: