[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

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/base/division-by-constant.h"
 #include "src/codegen.h"
 #include "src/compiler/diamond.h"
@@ skipping 415 matching lines @@
       if (m.HasValue()) return ReplaceInt32(static_cast<int32_t>(m.Value()));
       if (m.IsChangeInt32ToInt64()) return Replace(m.node()->InputAt(0));
       break;
     }
     case IrOpcode::kTruncateFloat64ToFloat32: {
       Float64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceFloat32(DoubleToFloat32(m.Value()));
       if (m.IsChangeFloat32ToFloat64()) return Replace(m.node()->InputAt(0));
       break;
     }
+    case IrOpcode::kFloat64InsertWord32:
+      return ReduceFloat64InsertWord32(node);
     case IrOpcode::kStore:
       return ReduceStore(node);
     default:
       break;
   }
   return NoChange();
 }
 
 
 Reduction MachineOperatorReducer::ReduceInt32Add(Node* node) {
@@ skipping 522 matching lines @@
     if (!msub.left().Is(32) || msub.right().node() != y) return NoChange();
   }
 
   node->set_op(machine()->Word32Ror());
   node->ReplaceInput(0, mshl.left().node());
   node->ReplaceInput(1, mshr.right().node());
   return Changed(node);
 }
 
 
+Reduction MachineOperatorReducer::ReduceFloat64InsertWord32(Node* node) {
+  DCHECK_EQ(IrOpcode::kFloat64InsertWord32, node->opcode());
+  Float64Matcher mlhs(node->InputAt(0));
+  Uint32Matcher mrhs(node->InputAt(1));
+  if (mlhs.HasValue() && mrhs.HasValue()) {
+    return ReplaceFloat64(bit_cast<double>(
+        base::bits::InsertElement64(bit_cast<uint64_t>(mlhs.Value()),
+                                    mrhs.Value(), OpParameter<int>(node))));
+  }
+  return NoChange();
+}
+
+
 CommonOperatorBuilder* MachineOperatorReducer::common() const {
   return jsgraph()->common();
 }
 
 
 MachineOperatorBuilder* MachineOperatorReducer::machine() const {
   return jsgraph()->machine();
 }
 
 
 Graph* MachineOperatorReducer::graph() const { return jsgraph()->graph(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8