[turbofan] Add backend support for load/store float32 values.

src/compiler/instruction-selector.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/instruction-selector.h"
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/pipeline.h"
@@ skipping 226 matching lines @@
         break;
       default:
         break;
     }
   }
 }
 
 
 void InstructionSelector::MarkAsRepresentation(MachineType rep, Node* node) {
   DCHECK_NOT_NULL(node);
-  if (RepresentationOf(rep) == kRepFloat64) MarkAsDouble(node);
-  if (RepresentationOf(rep) == kRepTagged) MarkAsReference(node);
+  switch (RepresentationOf(rep)) {
+    case kRepFloat32:
+    case kRepFloat64:
+      MarkAsDouble(node);
+      break;
+    case kRepTagged:
+      MarkAsReference(node);
+      break;
+    default:
+      break;
+  }
 }
 
 
 // TODO(bmeurer): Get rid of the CallBuffer business and make
 // InstructionSelector::VisitCall platform independent instead.
 CallBuffer::CallBuffer(Zone* zone, CallDescriptor* d,
                        FrameStateDescriptor* frame_desc)
     : descriptor(d),
       frame_state_descriptor(frame_desc),
       output_nodes(NodeVector::allocator_type(zone)),
@@ skipping 867 matching lines @@
 
 
 void InstructionSelector::VisitCall(Node* call, BasicBlock* continuation,
                                     BasicBlock* deoptimization) {}
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8