[turbofan] Add operators for float32 support.

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"
 #include "src/compiler/node-matchers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 MachineOperatorReducer::MachineOperatorReducer(JSGraph* jsgraph)
     : jsgraph_(jsgraph) {}
 
 
 MachineOperatorReducer::~MachineOperatorReducer() {}
 
 
+Node* MachineOperatorReducer::Float32Constant(volatile float value) {
+  return graph()->NewNode(common()->Float32Constant(value));
+}
+
+
 Node* MachineOperatorReducer::Float64Constant(volatile double value) {
   return jsgraph()->Float64Constant(value);
 }
 
 
 Node* MachineOperatorReducer::Int32Constant(int32_t value) {
   return jsgraph()->Int32Constant(value);
 }
 
 
@@ skipping 386 matching lines @@
       if (m.HasValue()) return ReplaceInt32(DoubleToInt32(m.Value()));
       if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
       break;
     }
     case IrOpcode::kTruncateInt64ToInt32: {
       Int64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceInt32(static_cast<int32_t>(m.Value()));
       if (m.IsChangeInt32ToInt64()) return Replace(m.node()->InputAt(0));
       break;
     }
+    case IrOpcode::kTruncateFloat64ToFloat32: {

[titzer, 2014/09/22 11:24:54]

What about reducing ChangeFloat32ToFloat64 as well?

[Benedikt Meurer, 2014/09/22 11:37:53]

Done.

+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat32(DoubleToFloat32(m.Value()));
+      if (m.IsChangeFloat32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
     // TODO(turbofan): strength-reduce and fold floating point operations.
     default:
       break;
   }
   return NoChange();
 }
 
 
 Reduction MachineOperatorReducer::ReduceProjection(size_t index, Node* node) {
   switch (node->opcode()) {
@@ skipping 40 matching lines @@
 MachineOperatorBuilder* MachineOperatorReducer::machine() const {
   return jsgraph()->machine();
 }
 
 
 Graph* MachineOperatorReducer::graph() const { return jsgraph()->graph(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8