[turbofan] Add operators for float32 support.

src/compiler/machine-operator-reducer-unittest.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/base/bits.h"
 #include "src/compiler/graph-unittest.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator-reducer.h"
 #include "src/compiler/typer.h"
 
@@ skipping 297 matching lines @@
         Reduce(graph()->NewNode(machine()->ChangeUint32ToUint64(),
                                 Int32Constant(bit_cast<int32_t>(x))));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(),
                 IsInt64Constant(bit_cast<int64_t>(static_cast<uint64_t>(x))));
   }
 }
 
 
 // -----------------------------------------------------------------------------
+// TruncateFloat64ToFloat32
+
+
+TEST_F(MachineOperatorReducerTest,
+       TruncateFloat64ToFloat32WithChangeFloat32ToFloat64) {
+  Node* value = Parameter(0);
+  Reduction reduction = Reduce(graph()->NewNode(
+      machine()->TruncateFloat64ToFloat32(),
+      graph()->NewNode(machine()->ChangeFloat32ToFloat64(), value)));
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_EQ(value, reduction.replacement());
+}
+
+
+TEST_F(MachineOperatorReducerTest, TruncateFloat64ToFloat32WithConstant) {
+  TRACED_FOREACH(double, x, kFloat64Values) {
+    Reduction reduction = Reduce(graph()->NewNode(
+        machine()->TruncateFloat64ToFloat32(), Float64Constant(x)));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(), IsFloat32Constant(DoubleToFloat32(x)));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
 // TruncateFloat64ToInt32
 
 
 TEST_F(MachineOperatorReducerTest,
        TruncateFloat64ToInt32WithChangeInt32ToFloat64) {
   Node* value = Parameter(0);
   Reduction reduction = Reduce(graph()->NewNode(
       machine()->TruncateFloat64ToInt32(),
       graph()->NewNode(machine()->ChangeInt32ToFloat64(), value)));
   ASSERT_TRUE(reduction.Changed());
@@ skipping 203 matching lines @@
       r = Reduce(graph()->NewNode(common()->Projection(0), add));
       ASSERT_TRUE(r.Changed());
       EXPECT_THAT(r.replacement(), IsInt32Constant(z));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8