[turbofan] Add backend support for float32.

test/cctest/compiler/test-run-machops.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 <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/compiler/generic-node-inl.h"
 #include "test/cctest/cctest.h"
@@ skipping 4224 matching lines @@
   double input = -1.0;
   RawMachineAssemblerTester<int32_t> m;
   m.Return(m.TruncateFloat64ToInt32(m.LoadFromPointer(&input, kMachFloat64)));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     input = kValues[i].from;
     uint64_t expected = static_cast<int64_t>(kValues[i].raw);
     CHECK_EQ(static_cast<int>(expected), m.Call());
   }
 }
 
+
+TEST(RunChangeFloat32ToFloat64) {
+  double actual = 0.0f;
+  float expected = 0.0;
+  RawMachineAssemblerTester<int32_t> m;
+  m.StoreToPointer(
+      &actual, kMachFloat64,
+      m.ChangeFloat32ToFloat64(m.LoadFromPointer(&expected, kMachFloat32)));
+  m.Return(m.Int32Constant(0));
+  FOR_FLOAT32_INPUTS(i) {
+    expected = *i;
+    CHECK_EQ(0, m.Call());
+    CHECK_EQ(expected, actual);
+  }
+}
+
+
+TEST(RunTruncateFloat64ToFloat32) {
+  float actual = 0.0f;
+  double input = 0.0;
+  RawMachineAssemblerTester<int32_t> m;
+  m.StoreToPointer(
+      &actual, kMachFloat32,
+      m.TruncateFloat64ToFloat32(m.LoadFromPointer(&input, kMachFloat64)));
+  m.Return(m.Int32Constant(0));
+  FOR_FLOAT64_INPUTS(i) {
+    input = *i;
+    volatile double expected = DoubleToFloat32(input);
+    CHECK_EQ(0, m.Call());
+    CHECK_EQ(expected, actual);
+  }
+}
+
 #endif  // V8_TURBOFAN_TARGET