[turbofan] Add backend support for float32.

src/compiler/js-typed-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/access-builder.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/node-aux-data-inl.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 538 matching lines @@
           simplified()->LoadField(AccessBuilder::ForExternalArrayPointer()),
           elements, NodeProperties::GetEffectInput(node));
       element_access = AccessBuilder::ForTypedArrayElement(type, true);
     } else {
       DCHECK(IsFixedTypedArrayElementsKind(elements_kind));
       element_access = AccessBuilder::ForTypedArrayElement(type, false);
     }
     Node* value =
         graph()->NewNode(simplified()->LoadElement(element_access), elements,
                          key, NodeProperties::GetEffectInput(node));
+    // TODO(titzer): Remove this hack once float32 is properly supported in
+    // simplified lowering.
+    if (element_access.machine_type == kRepFloat32) {

[titzer, 2014/09/24 10:55:23]

You can move this into simplified-lowering. A more general hack :)

+      Node* change =
+          graph()->NewNode(machine()->ChangeFloat32ToFloat64(), value);
+      NodeProperties::ReplaceWithValue(node, change, value);
+      return Changed(value);
+    }
     return ReplaceEagerly(node, value);
   }
   return NoChange();
 }
 
 
 Reduction JSTypedLowering::ReduceJSStoreProperty(Node* node) {
   Node* key = NodeProperties::GetValueInput(node, 1);
   Node* base = NodeProperties::GetValueInput(node, 0);
   Node* value = NodeProperties::GetValueInput(node, 2);
@@ skipping 23 matching lines @@
       DCHECK(IsFixedTypedArrayElementsKind(elements_kind));
       element_access = AccessBuilder::ForTypedArrayElement(type, false);
     }
 
     Node* check = graph()->NewNode(machine()->Uint32LessThan(), key,
                                    jsgraph()->Uint32Constant(length));
     Node* branch = graph()->NewNode(common()->Branch(), check,
                                     NodeProperties::GetControlInput(node));
 
     Node* if_true = graph()->NewNode(common()->IfTrue(), branch);
+    // TODO(titzer): Remove this hack once float32 is properly supported in
+    // simplified lowering.
+    if (element_access.machine_type == kRepFloat32) {
+      value = graph()->NewNode(machine()->TruncateFloat64ToFloat32(), value);
+    }
     Node* store = graph()->NewNode(
         simplified()->StoreElement(element_access), elements, key, value,
         NodeProperties::GetEffectInput(node), if_true);
 
     Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
 
     Node* merge = graph()->NewNode(common()->Merge(2), if_true, if_false);
     Node* phi = graph()->NewNode(common()->EffectPhi(2), store,
                                  NodeProperties::GetEffectInput(node), merge);
 
@@ skipping 85 matching lines @@
       return JSBuiltinReducer(jsgraph()).Reduce(node);
     default:
       break;
   }
   return NoChange();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8