WIP: Add first-class support for float32 representations.

src/compiler/machine-operator-reducer.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/machine-operator-reducer.h"
 
 #include "src/base/bits.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/js-graph.h"
@@ skipping 365 matching lines @@
         return Replace(m.right().node());
       }
       if (m.left().IsNaN()) {  // NaN % x => NaN
         return Replace(m.left().node());
       }
       if (m.IsFoldable()) {  // K % K => K
         return ReplaceFloat64(modulo(m.left().Value(), m.right().Value()));
       }
       break;
     }
+    // TODO(turbofan): Reduce float64/float32 changes and truncation.
     case IrOpcode::kChangeFloat64ToInt32: {
       Float64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceInt32(FastD2I(m.Value()));
       if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
       break;
     }
     case IrOpcode::kChangeFloat64ToUint32: {
       Float64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceInt32(FastD2UI(m.Value()));
       if (m.IsChangeUint32ToFloat64()) return Replace(m.node()->InputAt(0));
@@ skipping 84 matching lines @@
 MachineOperatorBuilder* MachineOperatorReducer::machine() const {
   return jsgraph()->machine();
 }
 
 
 Graph* MachineOperatorReducer::graph() const { return jsgraph()->graph(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8